]> git.ipfire.org Git - thirdparty/git.git/blobdiff - diff.c
Merge tag 'l10n-2.25.0-rnd1' of git://github.com/git-l10n/git-po
[thirdparty/git.git] / diff.c
diff --git a/diff.c b/diff.c
index e9d0e38123a59f2ca54674115df4140836b98f18..8e2914c0312ce7004c6b6ce3ab4b84b846630d65 100644 (file)
--- a/diff.c
+++ b/diff.c
@@ -13,6 +13,7 @@
 #include "attr.h"
 #include "run-command.h"
 #include "utf8.h"
+#include "object-store.h"
 #include "userdiff.h"
 #include "submodule-config.h"
 #include "submodule.h"
@@ -22,6 +23,9 @@
 #include "argv-array.h"
 #include "graph.h"
 #include "packfile.h"
+#include "parse-options.h"
+#include "help.h"
+#include "promisor-remote.h"
 
 #ifdef NO_FAST_WORKING_DIRECTORY
 #define FAST_WORKING_DIRECTORY 0
@@ -35,6 +39,7 @@ static int diff_rename_limit_default = 400;
 static int diff_suppress_blank_empty;
 static int diff_use_color_default = -1;
 static int diff_color_moved_default;
+static int diff_color_moved_ws_default;
 static int diff_context_default = 3;
 static int diff_interhunk_context_default;
 static const char *diff_word_regex_cfg;
@@ -67,48 +72,46 @@ static char diff_colors[][COLOR_MAXLEN] = {
        GIT_COLOR_BOLD_YELLOW,  /* NEW_MOVED ALTERNATIVE */
        GIT_COLOR_FAINT,        /* NEW_MOVED_DIM */
        GIT_COLOR_FAINT_ITALIC, /* NEW_MOVED_ALTERNATIVE_DIM */
+       GIT_COLOR_FAINT,        /* CONTEXT_DIM */
+       GIT_COLOR_FAINT_RED,    /* OLD_DIM */
+       GIT_COLOR_FAINT_GREEN,  /* NEW_DIM */
+       GIT_COLOR_BOLD,         /* CONTEXT_BOLD */
+       GIT_COLOR_BOLD_RED,     /* OLD_BOLD */
+       GIT_COLOR_BOLD_GREEN,   /* NEW_BOLD */
 };
 
-static NORETURN void die_want_option(const char *option_name)
-{
-       die(_("option '%s' requires a value"), option_name);
-}
+static const char *color_diff_slots[] = {
+       [DIFF_CONTEXT]                = "context",
+       [DIFF_METAINFO]               = "meta",
+       [DIFF_FRAGINFO]               = "frag",
+       [DIFF_FILE_OLD]               = "old",
+       [DIFF_FILE_NEW]               = "new",
+       [DIFF_COMMIT]                 = "commit",
+       [DIFF_WHITESPACE]             = "whitespace",
+       [DIFF_FUNCINFO]               = "func",
+       [DIFF_FILE_OLD_MOVED]         = "oldMoved",
+       [DIFF_FILE_OLD_MOVED_ALT]     = "oldMovedAlternative",
+       [DIFF_FILE_OLD_MOVED_DIM]     = "oldMovedDimmed",
+       [DIFF_FILE_OLD_MOVED_ALT_DIM] = "oldMovedAlternativeDimmed",
+       [DIFF_FILE_NEW_MOVED]         = "newMoved",
+       [DIFF_FILE_NEW_MOVED_ALT]     = "newMovedAlternative",
+       [DIFF_FILE_NEW_MOVED_DIM]     = "newMovedDimmed",
+       [DIFF_FILE_NEW_MOVED_ALT_DIM] = "newMovedAlternativeDimmed",
+       [DIFF_CONTEXT_DIM]            = "contextDimmed",
+       [DIFF_FILE_OLD_DIM]           = "oldDimmed",
+       [DIFF_FILE_NEW_DIM]           = "newDimmed",
+       [DIFF_CONTEXT_BOLD]           = "contextBold",
+       [DIFF_FILE_OLD_BOLD]          = "oldBold",
+       [DIFF_FILE_NEW_BOLD]          = "newBold",
+};
+
+define_list_config_array_extra(color_diff_slots, {"plain"});
 
 static int parse_diff_color_slot(const char *var)
 {
-       if (!strcasecmp(var, "context") || !strcasecmp(var, "plain"))
+       if (!strcasecmp(var, "plain"))
                return DIFF_CONTEXT;
-       if (!strcasecmp(var, "meta"))
-               return DIFF_METAINFO;
-       if (!strcasecmp(var, "frag"))
-               return DIFF_FRAGINFO;
-       if (!strcasecmp(var, "old"))
-               return DIFF_FILE_OLD;
-       if (!strcasecmp(var, "new"))
-               return DIFF_FILE_NEW;
-       if (!strcasecmp(var, "commit"))
-               return DIFF_COMMIT;
-       if (!strcasecmp(var, "whitespace"))
-               return DIFF_WHITESPACE;
-       if (!strcasecmp(var, "func"))
-               return DIFF_FUNCINFO;
-       if (!strcasecmp(var, "oldmoved"))
-               return DIFF_FILE_OLD_MOVED;
-       if (!strcasecmp(var, "oldmovedalternative"))
-               return DIFF_FILE_OLD_MOVED_ALT;
-       if (!strcasecmp(var, "oldmoveddimmed"))
-               return DIFF_FILE_OLD_MOVED_DIM;
-       if (!strcasecmp(var, "oldmovedalternativedimmed"))
-               return DIFF_FILE_OLD_MOVED_ALT_DIM;
-       if (!strcasecmp(var, "newmoved"))
-               return DIFF_FILE_NEW_MOVED;
-       if (!strcasecmp(var, "newmovedalternative"))
-               return DIFF_FILE_NEW_MOVED_ALT;
-       if (!strcasecmp(var, "newmoveddimmed"))
-               return DIFF_FILE_NEW_MOVED_DIM;
-       if (!strcasecmp(var, "newmovedalternativedimmed"))
-               return DIFF_FILE_NEW_MOVED_ALT_DIM;
-       return -1;
+       return LOOKUP_CONFIG(color_diff_slots, var);
 }
 
 static int parse_dirstat_params(struct diff_options *options, const char *params_string,
@@ -172,12 +175,16 @@ static int parse_submodule_params(struct diff_options *options, const char *valu
                options->submodule_format = DIFF_SUBMODULE_SHORT;
        else if (!strcmp(value, "diff"))
                options->submodule_format = DIFF_SUBMODULE_INLINE_DIFF;
+       /*
+        * Please update $__git_diff_submodule_formats in
+        * git-completion.bash when you add new formats.
+        */
        else
                return -1;
        return 0;
 }
 
-static int git_config_rename(const char *var, const char *value)
+int git_config_rename(const char *var, const char *value)
 {
        if (!value)
                return DIFF_DETECT_RENAME;
@@ -198,6 +205,10 @@ long parse_algorithm_value(const char *value)
                return XDF_PATIENCE_DIFF;
        else if (!strcasecmp(value, "histogram"))
                return XDF_HISTOGRAM_DIFF;
+       /*
+        * Please update $__git_diff_algorithms in git-completion.bash
+        * when you add new algorithms.
+        */
        return -1;
 }
 
@@ -271,14 +282,60 @@ static int parse_color_moved(const char *arg)
                return COLOR_MOVED_NO;
        else if (!strcmp(arg, "plain"))
                return COLOR_MOVED_PLAIN;
+       else if (!strcmp(arg, "blocks"))
+               return COLOR_MOVED_BLOCKS;
        else if (!strcmp(arg, "zebra"))
                return COLOR_MOVED_ZEBRA;
        else if (!strcmp(arg, "default"))
                return COLOR_MOVED_DEFAULT;
+       else if (!strcmp(arg, "dimmed-zebra"))
+               return COLOR_MOVED_ZEBRA_DIM;
        else if (!strcmp(arg, "dimmed_zebra"))
                return COLOR_MOVED_ZEBRA_DIM;
        else
-               return error(_("color moved setting must be one of 'no', 'default', 'zebra', 'dimmed_zebra', 'plain'"));
+               return error(_("color moved setting must be one of 'no', 'default', 'blocks', 'zebra', 'dimmed-zebra', 'plain'"));
+}
+
+static unsigned parse_color_moved_ws(const char *arg)
+{
+       int ret = 0;
+       struct string_list l = STRING_LIST_INIT_DUP;
+       struct string_list_item *i;
+
+       string_list_split(&l, arg, ',', -1);
+
+       for_each_string_list_item(i, &l) {
+               struct strbuf sb = STRBUF_INIT;
+               strbuf_addstr(&sb, i->string);
+               strbuf_trim(&sb);
+
+               if (!strcmp(sb.buf, "no"))
+                       ret = 0;
+               else if (!strcmp(sb.buf, "ignore-space-change"))
+                       ret |= XDF_IGNORE_WHITESPACE_CHANGE;
+               else if (!strcmp(sb.buf, "ignore-space-at-eol"))
+                       ret |= XDF_IGNORE_WHITESPACE_AT_EOL;
+               else if (!strcmp(sb.buf, "ignore-all-space"))
+                       ret |= XDF_IGNORE_WHITESPACE;
+               else if (!strcmp(sb.buf, "allow-indentation-change"))
+                       ret |= COLOR_MOVED_WS_ALLOW_INDENTATION_CHANGE;
+               else {
+                       ret |= COLOR_MOVED_WS_ERROR;
+                       error(_("unknown color-moved-ws mode '%s', possible values are 'ignore-space-change', 'ignore-space-at-eol', 'ignore-all-space', 'allow-indentation-change'"), sb.buf);
+               }
+
+               strbuf_release(&sb);
+       }
+
+       if ((ret & COLOR_MOVED_WS_ALLOW_INDENTATION_CHANGE) &&
+           (ret & XDF_WHITESPACE_FLAGS)) {
+               error(_("color-moved-ws: allow-indentation-change cannot be combined with other whitespace modes"));
+               ret |= COLOR_MOVED_WS_ERROR;
+       }
+
+       string_list_clear(&l, 0);
+
+       return ret;
 }
 
 int git_diff_ui_config(const char *var, const char *value, void *cb)
@@ -294,6 +351,13 @@ int git_diff_ui_config(const char *var, const char *value, void *cb)
                diff_color_moved_default = cm;
                return 0;
        }
+       if (!strcmp(var, "diff.colormovedws")) {
+               unsigned cm = parse_color_moved_ws(value);
+               if (cm & COLOR_MOVED_WS_ERROR)
+                       return -1;
+               diff_color_moved_ws_default = cm;
+               return 0;
+       }
        if (!strcmp(var, "diff.context")) {
                diff_context_default = git_config_int(var, value);
                if (diff_context_default < 0)
@@ -436,7 +500,7 @@ static const char *external_diff(void)
 
        if (done_preparing)
                return external_diff_cmd;
-       external_diff_cmd = getenv("GIT_EXTERNAL_DIFF");
+       external_diff_cmd = xstrdup_or_null(getenv("GIT_EXTERNAL_DIFF"));
        if (!external_diff_cmd)
                external_diff_cmd = external_diff_cmd_cfg;
        done_preparing = 1;
@@ -501,14 +565,15 @@ static int count_lines(const char *data, int size)
        return count;
 }
 
-static int fill_mmfile(mmfile_t *mf, struct diff_filespec *one)
+static int fill_mmfile(struct repository *r, mmfile_t *mf,
+                      struct diff_filespec *one)
 {
        if (!DIFF_FILE_VALID(one)) {
                mf->ptr = (char *)""; /* does not matter */
                mf->size = 0;
                return 0;
        }
-       else if (diff_populate_filespec(one, 0))
+       else if (diff_populate_filespec(r, one, 0))
                return -1;
 
        mf->ptr = one->data;
@@ -517,11 +582,12 @@ static int fill_mmfile(mmfile_t *mf, struct diff_filespec *one)
 }
 
 /* like fill_mmfile, but only for size, so we can avoid retrieving blob */
-static unsigned long diff_filespec_size(struct diff_filespec *one)
+static unsigned long diff_filespec_size(struct repository *r,
+                                       struct diff_filespec *one)
 {
        if (!DIFF_FILE_VALID(one))
                return 0;
-       diff_populate_filespec(one, CHECK_SIZE_ONLY);
+       diff_populate_filespec(r, one, CHECK_SIZE_ONLY);
        return one->size;
 }
 
@@ -570,37 +636,55 @@ static void check_blank_at_eof(mmfile_t *mf1, mmfile_t *mf2,
        ecbdata->blank_at_eof_in_postimage = (at - l2) + 1;
 }
 
-static void emit_line_0(struct diff_options *o, const char *set, const char *reset,
+static void emit_line_0(struct diff_options *o,
+                       const char *set_sign, const char *set, unsigned reverse, const char *reset,
                        int first, const char *line, int len)
 {
        int has_trailing_newline, has_trailing_carriage_return;
-       int nofirst;
+       int needs_reset = 0; /* at the end of the line */
        FILE *file = o->file;
 
        fputs(diff_line_prefix(o), file);
 
-       if (len == 0) {
-               has_trailing_newline = (first == '\n');
-               has_trailing_carriage_return = (!has_trailing_newline &&
-                                               (first == '\r'));
-               nofirst = has_trailing_newline || has_trailing_carriage_return;
-       } else {
-               has_trailing_newline = (len > 0 && line[len-1] == '\n');
-               if (has_trailing_newline)
-                       len--;
-               has_trailing_carriage_return = (len > 0 && line[len-1] == '\r');
-               if (has_trailing_carriage_return)
-                       len--;
-               nofirst = 0;
+       has_trailing_newline = (len > 0 && line[len-1] == '\n');
+       if (has_trailing_newline)
+               len--;
+
+       has_trailing_carriage_return = (len > 0 && line[len-1] == '\r');
+       if (has_trailing_carriage_return)
+               len--;
+
+       if (!len && !first)
+               goto end_of_line;
+
+       if (reverse && want_color(o->use_color)) {
+               fputs(GIT_COLOR_REVERSE, file);
+               needs_reset = 1;
+       }
+
+       if (set_sign) {
+               fputs(set_sign, file);
+               needs_reset = 1;
        }
 
-       if (len || !nofirst) {
+       if (first)
+               fputc(first, file);
+
+       if (!len)
+               goto end_of_line;
+
+       if (set) {
+               if (set_sign && set != set_sign)
+                       fputs(reset, file);
                fputs(set, file);
-               if (!nofirst)
-                       fputc(first, file);
-               fwrite(line, len, 1, file);
-               fputs(reset, file);
+               needs_reset = 1;
        }
+       fwrite(line, len, 1, file);
+       needs_reset = 1; /* 'line' may contain color codes. */
+
+end_of_line:
+       if (needs_reset)
+               fputs(reset, file);
        if (has_trailing_carriage_return)
                fputc('\r', file);
        if (has_trailing_newline)
@@ -610,7 +694,7 @@ static void emit_line_0(struct diff_options *o, const char *set, const char *res
 static void emit_line(struct diff_options *o, const char *set, const char *reset,
                      const char *line, int len)
 {
-       emit_line_0(o, set, reset, line[0], line+1, len-1);
+       emit_line_0(o, set, NULL, 0, reset, 0, line, len);
 }
 
 enum diff_symbol {
@@ -677,6 +761,8 @@ struct emitted_diff_symbol {
        const char *line;
        int len;
        int flags;
+       int indent_off;   /* Offset to first non-whitespace character */
+       int indent_width; /* The visual width of the indentation */
        enum diff_symbol s;
 };
 #define EMITTED_DIFF_SYMBOL_INIT {NULL}
@@ -707,14 +793,171 @@ struct moved_entry {
        struct moved_entry *next_line;
 };
 
-static int moved_entry_cmp(const struct diff_options *diffopt,
-                          const struct moved_entry *a,
-                          const struct moved_entry *b,
+struct moved_block {
+       struct moved_entry *match;
+       int wsd; /* The whitespace delta of this block */
+};
+
+static void moved_block_clear(struct moved_block *b)
+{
+       memset(b, 0, sizeof(*b));
+}
+
+#define INDENT_BLANKLINE INT_MIN
+
+static void fill_es_indent_data(struct emitted_diff_symbol *es)
+{
+       unsigned int off = 0, i;
+       int width = 0, tab_width = es->flags & WS_TAB_WIDTH_MASK;
+       const char *s = es->line;
+       const int len = es->len;
+
+       /* skip any \v \f \r at start of indentation */
+       while (s[off] == '\f' || s[off] == '\v' ||
+              (s[off] == '\r' && off < len - 1))
+               off++;
+
+       /* calculate the visual width of indentation */
+       while(1) {
+               if (s[off] == ' ') {
+                       width++;
+                       off++;
+               } else if (s[off] == '\t') {
+                       width += tab_width - (width % tab_width);
+                       while (s[++off] == '\t')
+                               width += tab_width;
+               } else {
+                       break;
+               }
+       }
+
+       /* check if this line is blank */
+       for (i = off; i < len; i++)
+               if (!isspace(s[i]))
+                   break;
+
+       if (i == len) {
+               es->indent_width = INDENT_BLANKLINE;
+               es->indent_off = len;
+       } else {
+               es->indent_off = off;
+               es->indent_width = width;
+       }
+}
+
+static int compute_ws_delta(const struct emitted_diff_symbol *a,
+                           const struct emitted_diff_symbol *b,
+                           int *out)
+{
+       int a_len = a->len,
+           b_len = b->len,
+           a_off = a->indent_off,
+           a_width = a->indent_width,
+           b_off = b->indent_off,
+           b_width = b->indent_width;
+       int delta;
+
+       if (a_width == INDENT_BLANKLINE && b_width == INDENT_BLANKLINE) {
+               *out = INDENT_BLANKLINE;
+               return 1;
+       }
+
+       if (a->s == DIFF_SYMBOL_PLUS)
+               delta = a_width - b_width;
+       else
+               delta = b_width - a_width;
+
+       if (a_len - a_off != b_len - b_off ||
+           memcmp(a->line + a_off, b->line + b_off, a_len - a_off))
+               return 0;
+
+       *out = delta;
+
+       return 1;
+}
+
+static int cmp_in_block_with_wsd(const struct diff_options *o,
+                                const struct moved_entry *cur,
+                                const struct moved_entry *match,
+                                struct moved_block *pmb,
+                                int n)
+{
+       struct emitted_diff_symbol *l = &o->emitted_symbols->buf[n];
+       int al = cur->es->len, bl = match->es->len, cl = l->len;
+       const char *a = cur->es->line,
+                  *b = match->es->line,
+                  *c = l->line;
+       int a_off = cur->es->indent_off,
+           a_width = cur->es->indent_width,
+           c_off = l->indent_off,
+           c_width = l->indent_width;
+       int delta;
+
+       /*
+        * We need to check if 'cur' is equal to 'match'.  As those
+        * are from the same (+/-) side, we do not need to adjust for
+        * indent changes. However these were found using fuzzy
+        * matching so we do have to check if they are equal. Here we
+        * just check the lengths. We delay calling memcmp() to check
+        * the contents until later as if the length comparison for a
+        * and c fails we can avoid the call all together.
+        */
+       if (al != bl)
+               return 1;
+
+       /* If 'l' and 'cur' are both blank then they match. */
+       if (a_width == INDENT_BLANKLINE && c_width == INDENT_BLANKLINE)
+               return 0;
+
+       /*
+        * The indent changes of the block are known and stored in pmb->wsd;
+        * however we need to check if the indent changes of the current line
+        * match those of the current block and that the text of 'l' and 'cur'
+        * after the indentation match.
+        */
+       if (cur->es->s == DIFF_SYMBOL_PLUS)
+               delta = a_width - c_width;
+       else
+               delta = c_width - a_width;
+
+       /*
+        * If the previous lines of this block were all blank then set its
+        * whitespace delta.
+        */
+       if (pmb->wsd == INDENT_BLANKLINE)
+               pmb->wsd = delta;
+
+       return !(delta == pmb->wsd && al - a_off == cl - c_off &&
+                !memcmp(a, b, al) && !
+                memcmp(a + a_off, c + c_off, al - a_off));
+}
+
+static int moved_entry_cmp(const void *hashmap_cmp_fn_data,
+                          const struct hashmap_entry *eptr,
+                          const struct hashmap_entry *entry_or_key,
                           const void *keydata)
 {
+       const struct diff_options *diffopt = hashmap_cmp_fn_data;
+       const struct moved_entry *a, *b;
+       unsigned flags = diffopt->color_moved_ws_handling
+                        & XDF_WHITESPACE_FLAGS;
+
+       a = container_of(eptr, const struct moved_entry, ent);
+       b = container_of(entry_or_key, const struct moved_entry, ent);
+
+       if (diffopt->color_moved_ws_handling &
+           COLOR_MOVED_WS_ALLOW_INDENTATION_CHANGE)
+               /*
+                * As there is not specific white space config given,
+                * we'd need to check for a new block, so ignore all
+                * white space. The setup of the white space
+                * configuration for the next block is done else where
+                */
+               flags |= XDF_IGNORE_WHITESPACE;
+
        return !xdiff_compare_lines(a->es->line, a->es->len,
                                    b->es->line, b->es->len,
-                                   diffopt->xdl_opts);
+                                   flags);
 }
 
 static struct moved_entry *prepare_entry(struct diff_options *o,
@@ -722,8 +965,10 @@ static struct moved_entry *prepare_entry(struct diff_options *o,
 {
        struct moved_entry *ret = xmalloc(sizeof(*ret));
        struct emitted_diff_symbol *l = &o->emitted_symbols->buf[line_no];
+       unsigned flags = o->color_moved_ws_handling & XDF_WHITESPACE_FLAGS;
+       unsigned int hash = xdiff_hash_string(l->line, l->len, flags);
 
-       ret->ent.hash = xdiff_hash_string(l->line, l->len, o->xdl_opts);
+       hashmap_entry_init(&ret->ent, hash);
        ret->es = l;
        ret->next_line = NULL;
 
@@ -753,33 +998,88 @@ static void add_lines_to_move_detection(struct diff_options *o,
                        continue;
                }
 
+               if (o->color_moved_ws_handling &
+                   COLOR_MOVED_WS_ALLOW_INDENTATION_CHANGE)
+                       fill_es_indent_data(&o->emitted_symbols->buf[n]);
                key = prepare_entry(o, n);
                if (prev_line && prev_line->es->s == o->emitted_symbols->buf[n].s)
                        prev_line->next_line = key;
 
-               hashmap_add(hm, key);
+               hashmap_add(hm, &key->ent);
                prev_line = key;
        }
 }
 
-static int shrink_potential_moved_blocks(struct moved_entry **pmb,
+static void pmb_advance_or_null(struct diff_options *o,
+                               struct moved_entry *match,
+                               struct hashmap *hm,
+                               struct moved_block *pmb,
+                               int pmb_nr)
+{
+       int i;
+       for (i = 0; i < pmb_nr; i++) {
+               struct moved_entry *prev = pmb[i].match;
+               struct moved_entry *cur = (prev && prev->next_line) ?
+                               prev->next_line : NULL;
+               if (cur && !hm->cmpfn(o, &cur->ent, &match->ent, NULL)) {
+                       pmb[i].match = cur;
+               } else {
+                       pmb[i].match = NULL;
+               }
+       }
+}
+
+static void pmb_advance_or_null_multi_match(struct diff_options *o,
+                                           struct moved_entry *match,
+                                           struct hashmap *hm,
+                                           struct moved_block *pmb,
+                                           int pmb_nr, int n)
+{
+       int i;
+       char *got_match = xcalloc(1, pmb_nr);
+
+       hashmap_for_each_entry_from(hm, match, ent) {
+               for (i = 0; i < pmb_nr; i++) {
+                       struct moved_entry *prev = pmb[i].match;
+                       struct moved_entry *cur = (prev && prev->next_line) ?
+                                       prev->next_line : NULL;
+                       if (!cur)
+                               continue;
+                       if (!cmp_in_block_with_wsd(o, cur, match, &pmb[i], n))
+                               got_match[i] |= 1;
+               }
+       }
+
+       for (i = 0; i < pmb_nr; i++) {
+               if (got_match[i]) {
+                       /* Advance to the next line */
+                       pmb[i].match = pmb[i].match->next_line;
+               } else {
+                       moved_block_clear(&pmb[i]);
+               }
+       }
+
+       free(got_match);
+}
+
+static int shrink_potential_moved_blocks(struct moved_block *pmb,
                                         int pmb_nr)
 {
        int lp, rp;
 
        /* Shrink the set of potential block to the remaining running */
        for (lp = 0, rp = pmb_nr - 1; lp <= rp;) {
-               while (lp < pmb_nr && pmb[lp])
+               while (lp < pmb_nr && pmb[lp].match)
                        lp++;
                /* lp points at the first NULL now */
 
-               while (rp > -1 && !pmb[rp])
+               while (rp > -1 && !pmb[rp].match)
                        rp--;
                /* rp points at the last non-NULL */
 
                if (lp < pmb_nr && rp > -1 && lp < rp) {
                        pmb[lp] = pmb[rp];
-                       pmb[rp] = NULL;
+                       memset(&pmb[rp], 0, sizeof(pmb[rp]));
                        rp--;
                        lp++;
                }
@@ -799,14 +1099,17 @@ static int shrink_potential_moved_blocks(struct moved_entry **pmb,
  * The last block consists of the (n - block_length)'th line up to but not
  * including the nth line.
  *
+ * Returns 0 if the last block is empty or is unset by this function, non zero
+ * otherwise.
+ *
  * NEEDSWORK: This uses the same heuristic as blame_entry_score() in blame.c.
  * Think of a way to unify them.
  */
-static void adjust_last_block(struct diff_options *o, int n, int block_length)
+static int adjust_last_block(struct diff_options *o, int n, int block_length)
 {
        int i, alnum_count = 0;
        if (o->color_moved == COLOR_MOVED_PLAIN)
-               return;
+               return block_length;
        for (i = 1; i < block_length + 1; i++) {
                const char *c = o->emitted_symbols->buf[n - i].line;
                for (; *c; c++) {
@@ -814,11 +1117,12 @@ static void adjust_last_block(struct diff_options *o, int n, int block_length)
                                continue;
                        alnum_count++;
                        if (alnum_count >= COLOR_MOVED_MIN_ALNUM_COUNT)
-                               return;
+                               return 1;
                }
        }
        for (i = 1; i < block_length + 1; i++)
                o->emitted_symbols->buf[n - i].flags &= ~DIFF_SYMBOL_MOVED_LINE;
+       return 0;
 }
 
 /* Find blocks of moved code, delegate actual coloring decision to helper */
@@ -826,9 +1130,9 @@ static void mark_color_as_moved(struct diff_options *o,
                                struct hashmap *add_lines,
                                struct hashmap *del_lines)
 {
-       struct moved_entry **pmb = NULL; /* potentially moved blocks */
+       struct moved_block *pmb = NULL; /* potentially moved blocks */
        int pmb_nr = 0, pmb_alloc = 0;
-       int n, flipped_block = 1, block_length = 0;
+       int n, flipped_block = 0, block_length = 0;
 
 
        for (n = 0; n < o->emitted_symbols->nr; n++) {
@@ -836,49 +1140,50 @@ static void mark_color_as_moved(struct diff_options *o,
                struct moved_entry *key;
                struct moved_entry *match = NULL;
                struct emitted_diff_symbol *l = &o->emitted_symbols->buf[n];
-               int i;
+               enum diff_symbol last_symbol = 0;
 
                switch (l->s) {
                case DIFF_SYMBOL_PLUS:
                        hm = del_lines;
                        key = prepare_entry(o, n);
-                       match = hashmap_get(hm, key, o);
+                       match = hashmap_get_entry(hm, key, ent, NULL);
                        free(key);
                        break;
                case DIFF_SYMBOL_MINUS:
                        hm = add_lines;
                        key = prepare_entry(o, n);
-                       match = hashmap_get(hm, key, o);
+                       match = hashmap_get_entry(hm, key, ent, NULL);
                        free(key);
                        break;
                default:
-                       flipped_block = 1;
+                       flipped_block = 0;
                }
 
                if (!match) {
+                       int i;
+
                        adjust_last_block(o, n, block_length);
+                       for(i = 0; i < pmb_nr; i++)
+                               moved_block_clear(&pmb[i]);
                        pmb_nr = 0;
                        block_length = 0;
+                       flipped_block = 0;
+                       last_symbol = l->s;
                        continue;
                }
 
-               l->flags |= DIFF_SYMBOL_MOVED_LINE;
-
-               if (o->color_moved == COLOR_MOVED_PLAIN)
+               if (o->color_moved == COLOR_MOVED_PLAIN) {
+                       last_symbol = l->s;
+                       l->flags |= DIFF_SYMBOL_MOVED_LINE;
                        continue;
-
-               /* Check any potential block runs, advance each or nullify */
-               for (i = 0; i < pmb_nr; i++) {
-                       struct moved_entry *p = pmb[i];
-                       struct moved_entry *pnext = (p && p->next_line) ?
-                                       p->next_line : NULL;
-                       if (pnext && !hm->cmpfn(o, pnext, match, NULL)) {
-                               pmb[i] = p->next_line;
-                       } else {
-                               pmb[i] = NULL;
-                       }
                }
 
+               if (o->color_moved_ws_handling &
+                   COLOR_MOVED_WS_ALLOW_INDENTATION_CHANGE)
+                       pmb_advance_or_null_multi_match(o, match, hm, pmb, pmb_nr, n);
+               else
+                       pmb_advance_or_null(o, match, hm, pmb, pmb_nr);
+
                pmb_nr = shrink_potential_moved_blocks(pmb, pmb_nr);
 
                if (pmb_nr == 0) {
@@ -886,24 +1191,40 @@ static void mark_color_as_moved(struct diff_options *o,
                         * The current line is the start of a new block.
                         * Setup the set of potential blocks.
                         */
-                       for (; match; match = hashmap_get_next(hm, match)) {
+                       hashmap_for_each_entry_from(hm, match, ent) {
                                ALLOC_GROW(pmb, pmb_nr + 1, pmb_alloc);
-                               pmb[pmb_nr++] = match;
+                               if (o->color_moved_ws_handling &
+                                   COLOR_MOVED_WS_ALLOW_INDENTATION_CHANGE) {
+                                       if (compute_ws_delta(l, match->es,
+                                                            &pmb[pmb_nr].wsd))
+                                               pmb[pmb_nr++].match = match;
+                               } else {
+                                       pmb[pmb_nr].wsd = 0;
+                                       pmb[pmb_nr++].match = match;
+                               }
                        }
 
-                       flipped_block = (flipped_block + 1) % 2;
+                       if (adjust_last_block(o, n, block_length) &&
+                           pmb_nr && last_symbol != l->s)
+                               flipped_block = (flipped_block + 1) % 2;
+                       else
+                               flipped_block = 0;
 
-                       adjust_last_block(o, n, block_length);
                        block_length = 0;
                }
 
-               block_length++;
-
-               if (flipped_block)
-                       l->flags |= DIFF_SYMBOL_MOVED_LINE_ALT;
+               if (pmb_nr) {
+                       block_length++;
+                       l->flags |= DIFF_SYMBOL_MOVED_LINE;
+                       if (flipped_block && o->color_moved != COLOR_MOVED_BLOCKS)
+                               l->flags |= DIFF_SYMBOL_MOVED_LINE_ALT;
+               }
+               last_symbol = l->s;
        }
        adjust_last_block(o, n, block_length);
 
+       for(n = 0; n < pmb_nr; n++)
+               moved_block_clear(&pmb[n]);
        free(pmb);
 }
 
@@ -969,11 +1290,13 @@ static void dim_moved_lines(struct diff_options *o)
 }
 
 static void emit_line_ws_markup(struct diff_options *o,
-                               const char *set, const char *reset,
-                               const char *line, int len, char sign,
+                               const char *set_sign, const char *set,
+                               const char *reset,
+                               int sign_index, const char *line, int len,
                                unsigned ws_rule, int blank_at_eof)
 {
        const char *ws = NULL;
+       int sign = o->output_indicators[sign_index];
 
        if (o->ws_error_highlight & ws_rule) {
                ws = diff_get_color_opt(o, DIFF_WHITESPACE);
@@ -981,14 +1304,17 @@ static void emit_line_ws_markup(struct diff_options *o,
                        ws = NULL;
        }
 
-       if (!ws)
-               emit_line_0(o, set, reset, sign, line, len);
-       else if (blank_at_eof)
+       if (!ws && !set_sign)
+               emit_line_0(o, set, NULL, 0, reset, sign, line, len);
+       else if (!ws) {
+               emit_line_0(o, set_sign, set, !!set_sign, reset, sign, line, len);
+       } else if (blank_at_eof)
                /* Blank line at EOF - paint '+' as well */
-               emit_line_0(o, ws, reset, sign, line, len);
+               emit_line_0(o, ws, NULL, 0, reset, sign, line, len);
        else {
                /* Emit just the prefix, then the rest. */
-               emit_line_0(o, set, reset, sign, "", 0);
+               emit_line_0(o, set_sign ? set_sign : set, NULL, !!set_sign, reset,
+                           sign, "", 0);
                ws_check_emit(line, len, ws_rule,
                              o->file, set, reset, ws);
        }
@@ -998,7 +1324,7 @@ static void emit_diff_symbol_from_struct(struct diff_options *o,
                                         struct emitted_diff_symbol *eds)
 {
        static const char *nneof = " No newline at end of file\n";
-       const char *context, *reset, *set, *meta, *fraginfo;
+       const char *context, *reset, *set, *set_sign, *meta, *fraginfo;
        struct strbuf sb = STRBUF_INIT;
 
        enum diff_symbol s = eds->s;
@@ -1011,7 +1337,7 @@ static void emit_diff_symbol_from_struct(struct diff_options *o,
                context = diff_get_color_opt(o, DIFF_CONTEXT);
                reset = diff_get_color_opt(o, DIFF_RESET);
                putc('\n', o->file);
-               emit_line_0(o, context, reset, '\\',
+               emit_line_0(o, context, NULL, 0, reset, '\\',
                            nneof, strlen(nneof));
                break;
        case DIFF_SYMBOL_SUBMODULE_HEADER:
@@ -1038,7 +1364,19 @@ static void emit_diff_symbol_from_struct(struct diff_options *o,
        case DIFF_SYMBOL_CONTEXT:
                set = diff_get_color_opt(o, DIFF_CONTEXT);
                reset = diff_get_color_opt(o, DIFF_RESET);
-               emit_line_ws_markup(o, set, reset, line, len, ' ',
+               set_sign = NULL;
+               if (o->flags.dual_color_diffed_diffs) {
+                       char c = !len ? 0 : line[0];
+
+                       if (c == '+')
+                               set = diff_get_color_opt(o, DIFF_FILE_NEW);
+                       else if (c == '@')
+                               set = diff_get_color_opt(o, DIFF_FRAGINFO);
+                       else if (c == '-')
+                               set = diff_get_color_opt(o, DIFF_FILE_OLD);
+               }
+               emit_line_ws_markup(o, set_sign, set, reset,
+                                   OUTPUT_INDICATOR_CONTEXT, line, len,
                                    flags & (DIFF_SYMBOL_CONTENT_WS_MASK), 0);
                break;
        case DIFF_SYMBOL_PLUS:
@@ -1065,7 +1403,24 @@ static void emit_diff_symbol_from_struct(struct diff_options *o,
                        set = diff_get_color_opt(o, DIFF_FILE_NEW);
                }
                reset = diff_get_color_opt(o, DIFF_RESET);
-               emit_line_ws_markup(o, set, reset, line, len, '+',
+               if (!o->flags.dual_color_diffed_diffs)
+                       set_sign = NULL;
+               else {
+                       char c = !len ? 0 : line[0];
+
+                       set_sign = set;
+                       if (c == '-')
+                               set = diff_get_color_opt(o, DIFF_FILE_OLD_BOLD);
+                       else if (c == '@')
+                               set = diff_get_color_opt(o, DIFF_FRAGINFO);
+                       else if (c == '+')
+                               set = diff_get_color_opt(o, DIFF_FILE_NEW_BOLD);
+                       else
+                               set = diff_get_color_opt(o, DIFF_CONTEXT_BOLD);
+                       flags &= ~DIFF_SYMBOL_CONTENT_WS_MASK;
+               }
+               emit_line_ws_markup(o, set_sign, set, reset,
+                                   OUTPUT_INDICATOR_NEW, line, len,
                                    flags & DIFF_SYMBOL_CONTENT_WS_MASK,
                                    flags & DIFF_SYMBOL_CONTENT_BLANK_LINE_EOF);
                break;
@@ -1093,7 +1448,23 @@ static void emit_diff_symbol_from_struct(struct diff_options *o,
                        set = diff_get_color_opt(o, DIFF_FILE_OLD);
                }
                reset = diff_get_color_opt(o, DIFF_RESET);
-               emit_line_ws_markup(o, set, reset, line, len, '-',
+               if (!o->flags.dual_color_diffed_diffs)
+                       set_sign = NULL;
+               else {
+                       char c = !len ? 0 : line[0];
+
+                       set_sign = set;
+                       if (c == '+')
+                               set = diff_get_color_opt(o, DIFF_FILE_NEW_DIM);
+                       else if (c == '@')
+                               set = diff_get_color_opt(o, DIFF_FRAGINFO);
+                       else if (c == '-')
+                               set = diff_get_color_opt(o, DIFF_FILE_OLD_DIM);
+                       else
+                               set = diff_get_color_opt(o, DIFF_CONTEXT_DIM);
+               }
+               emit_line_ws_markup(o, set_sign, set, reset,
+                                   OUTPUT_INDICATOR_OLD, line, len,
                                    flags & DIFF_SYMBOL_CONTENT_WS_MASK, 0);
                break;
        case DIFF_SYMBOL_WORDS_PORCELAIN:
@@ -1184,7 +1555,7 @@ static void emit_diff_symbol_from_struct(struct diff_options *o,
                fputs(o->stat_sep, o->file);
                break;
        default:
-               die("BUG: unknown diff symbol");
+               BUG("unknown diff symbol");
        }
        strbuf_release(&sb);
 }
@@ -1192,7 +1563,7 @@ static void emit_diff_symbol_from_struct(struct diff_options *o,
 static void emit_diff_symbol(struct diff_options *o, enum diff_symbol s,
                             const char *line, int len, unsigned flags)
 {
-       struct emitted_diff_symbol e = {line, len, flags, s};
+       struct emitted_diff_symbol e = {line, len, flags, 0, 0, s};
 
        if (o->emitted_symbols)
                append_emitted_diff_symbol(o, &e);
@@ -1250,8 +1621,7 @@ static int new_blank_line_at_eof(struct emit_callback *ecbdata, const char *line
        return ws_blank_line(line, len, ecbdata->ws_rule);
 }
 
-static void emit_add_line(const char *reset,
-                         struct emit_callback *ecbdata,
+static void emit_add_line(struct emit_callback *ecbdata,
                          const char *line, int len)
 {
        unsigned flags = WSEH_NEW | ecbdata->ws_rule;
@@ -1261,16 +1631,14 @@ static void emit_add_line(const char *reset,
        emit_diff_symbol(ecbdata->opt, DIFF_SYMBOL_PLUS, line, len, flags);
 }
 
-static void emit_del_line(const char *reset,
-                         struct emit_callback *ecbdata,
+static void emit_del_line(struct emit_callback *ecbdata,
                          const char *line, int len)
 {
        unsigned flags = WSEH_OLD | ecbdata->ws_rule;
        emit_diff_symbol(ecbdata->opt, DIFF_SYMBOL_MINUS, line, len, flags);
 }
 
-static void emit_context_line(const char *reset,
-                             struct emit_callback *ecbdata,
+static void emit_context_line(struct emit_callback *ecbdata,
                              const char *line, int len)
 {
        unsigned flags = WSEH_CONTEXT | ecbdata->ws_rule;
@@ -1284,6 +1652,7 @@ static void emit_hunk_header(struct emit_callback *ecbdata,
        const char *frag = diff_get_color(ecbdata->color_diff, DIFF_FRAGINFO);
        const char *func = diff_get_color(ecbdata->color_diff, DIFF_FUNCINFO);
        const char *reset = diff_get_color(ecbdata->color_diff, DIFF_RESET);
+       const char *reverse = ecbdata->color_diff ? GIT_COLOR_REVERSE : "";
        static const char atat[2] = { '@', '@' };
        const char *cp, *ep;
        struct strbuf msgbuf = STRBUF_INIT;
@@ -1304,8 +1673,13 @@ static void emit_hunk_header(struct emit_callback *ecbdata,
        ep += 2; /* skip over @@ */
 
        /* The hunk header in fraginfo color */
+       if (ecbdata->opt->flags.dual_color_diffed_diffs)
+               strbuf_addstr(&msgbuf, reverse);
        strbuf_addstr(&msgbuf, frag);
-       strbuf_add(&msgbuf, line, ep - line);
+       if (ecbdata->opt->flags.suppress_hunk_header_line_count)
+               strbuf_add(&msgbuf, atat, sizeof(atat));
+       else
+               strbuf_add(&msgbuf, line, ep - line);
        strbuf_addstr(&msgbuf, reset);
 
        /*
@@ -1338,12 +1712,13 @@ static void emit_hunk_header(struct emit_callback *ecbdata,
        strbuf_release(&msgbuf);
 }
 
-static struct diff_tempfile *claim_diff_tempfile(void) {
+static struct diff_tempfile *claim_diff_tempfile(void)
+{
        int i;
        for (i = 0; i < ARRAY_SIZE(diff_temp); i++)
                if (!diff_temp[i].name)
                        return diff_temp + i;
-       die("BUG: diff is failing to clean up its tempfiles");
+       BUG("diff is failing to clean up its tempfiles");
 }
 
 static void remove_tempfile(void)
@@ -1375,7 +1750,6 @@ static void emit_rewrite_lines(struct emit_callback *ecb,
                               int prefix, const char *data, int size)
 {
        const char *endp = NULL;
-       const char *reset = diff_get_color(ecb->color_diff, DIFF_RESET);
 
        while (0 < size) {
                int len;
@@ -1384,10 +1758,10 @@ static void emit_rewrite_lines(struct emit_callback *ecb,
                len = endp ? (endp - data + 1) : size;
                if (prefix != '+') {
                        ecb->lno_in_preimage++;
-                       emit_del_line(reset, ecb, data, len);
+                       emit_del_line(ecb, data, len);
                } else {
                        ecb->lno_in_postimage++;
-                       emit_add_line(reset, ecb, data, len);
+                       emit_add_line(ecb, data, len);
                }
                size -= len;
                data += len;
@@ -1428,12 +1802,12 @@ static void emit_rewrite_diff(const char *name_a,
        quote_two_c_style(&a_name, a_prefix, name_a, 0);
        quote_two_c_style(&b_name, b_prefix, name_b, 0);
 
-       size_one = fill_textconv(textconv_one, one, &data_one);
-       size_two = fill_textconv(textconv_two, two, &data_two);
+       size_one = fill_textconv(o->repo, textconv_one, one, &data_one);
+       size_two = fill_textconv(o->repo, textconv_two, two, &data_two);
 
        memset(&ecbdata, 0, sizeof(ecbdata));
        ecbdata.color_diff = want_color(o->use_color);
-       ecbdata.ws_rule = whitespace_rule(name_b);
+       ecbdata.ws_rule = whitespace_rule(o->repo->index, name_b);
        ecbdata.opt = o;
        if (ecbdata.ws_rule & WS_BLANK_AT_EOF) {
                mmfile_t mf1, mf2;
@@ -1504,7 +1878,7 @@ struct diff_words_style_elem {
 
 struct diff_words_style {
        enum diff_words_type type;
-       struct diff_words_style_elem new, old, ctx;
+       struct diff_words_style_elem new_word, old_word, ctx;
        const char *newline;
 };
 
@@ -1613,19 +1987,17 @@ static int color_words_output_graph_prefix(struct diff_words_data *diff_words)
        }
 }
 
-static void fn_out_diff_words_aux(void *priv, char *line, unsigned long len)
+static void fn_out_diff_words_aux(void *priv,
+                                 long minus_first, long minus_len,
+                                 long plus_first, long plus_len,
+                                 const char *func, long funclen)
 {
        struct diff_words_data *diff_words = priv;
        struct diff_words_style *style = diff_words->style;
-       int minus_first, minus_len, plus_first, plus_len;
        const char *minus_begin, *minus_end, *plus_begin, *plus_end;
        struct diff_options *opt = diff_words->opt;
        const char *line_prefix;
 
-       if (line[0] != '@' || parse_hunk_header(line, len,
-                       &minus_first, &minus_len, &plus_first, &plus_len))
-               return;
-
        assert(opt);
        line_prefix = diff_line_prefix(opt);
 
@@ -1655,12 +2027,12 @@ static void fn_out_diff_words_aux(void *priv, char *line, unsigned long len)
        }
        if (minus_begin != minus_end) {
                fn_out_diff_words_write_helper(diff_words->opt,
-                               &style->old, style->newline,
+                               &style->old_word, style->newline,
                                minus_end - minus_begin, minus_begin);
        }
        if (plus_begin != plus_end) {
                fn_out_diff_words_write_helper(diff_words->opt,
-                               &style->new, style->newline,
+                               &style->new_word, style->newline,
                                plus_end - plus_begin, plus_begin);
        }
 
@@ -1758,7 +2130,7 @@ static void diff_words_show(struct diff_words_data *diff_words)
                emit_diff_symbol(diff_words->opt, DIFF_SYMBOL_WORD_DIFF,
                                 line_prefix, strlen(line_prefix), 0);
                fn_out_diff_words_write_helper(diff_words->opt,
-                       &style->old, style->newline,
+                       &style->old_word, style->newline,
                        diff_words->minus.text.size,
                        diff_words->minus.text.ptr);
                diff_words->minus.text.size = 0;
@@ -1775,8 +2147,8 @@ static void diff_words_show(struct diff_words_data *diff_words)
        xpp.flags = 0;
        /* as only the hunk header will be parsed, we need a 0-context */
        xecfg.ctxlen = 0;
-       if (xdi_diff_outf(&minus, &plus, fn_out_diff_words_aux, diff_words,
-                         &xpp, &xecfg))
+       if (xdi_diff_outf(&minus, &plus, fn_out_diff_words_aux, NULL,
+                         diff_words, &xpp, &xecfg))
                die("unable to generate word diff");
        free(minus.ptr);
        free(plus.ptr);
@@ -1821,23 +2193,25 @@ static void diff_words_flush(struct emit_callback *ecbdata)
        }
 }
 
-static void diff_filespec_load_driver(struct diff_filespec *one)
+static void diff_filespec_load_driver(struct diff_filespec *one,
+                                     struct index_state *istate)
 {
        /* Use already-loaded driver */
        if (one->driver)
                return;
 
        if (S_ISREG(one->mode))
-               one->driver = userdiff_find_by_path(one->path);
+               one->driver = userdiff_find_by_path(istate, one->path);
 
        /* Fallback to default settings */
        if (!one->driver)
                one->driver = userdiff_find_by_name("default");
 }
 
-static const char *userdiff_word_regex(struct diff_filespec *one)
+static const char *userdiff_word_regex(struct diff_filespec *one,
+                                      struct index_state *istate)
 {
-       diff_filespec_load_driver(one);
+       diff_filespec_load_driver(one, istate);
        return one->driver->word_regex;
 }
 
@@ -1860,9 +2234,9 @@ static void init_diff_words_data(struct emit_callback *ecbdata,
                        xcalloc(1, sizeof(struct emitted_diff_symbols));
 
        if (!o->word_regex)
-               o->word_regex = userdiff_word_regex(one);
+               o->word_regex = userdiff_word_regex(one, o->repo->index);
        if (!o->word_regex)
-               o->word_regex = userdiff_word_regex(two);
+               o->word_regex = userdiff_word_regex(two, o->repo->index);
        if (!o->word_regex)
                o->word_regex = diff_word_regex_cfg;
        if (o->word_regex) {
@@ -1871,8 +2245,8 @@ static void init_diff_words_data(struct emit_callback *ecbdata,
                if (regcomp(ecbdata->diff_words->word_regex,
                            o->word_regex,
                            REG_EXTENDED | REG_NEWLINE))
-                       die ("Invalid regular expression: %s",
-                            o->word_regex);
+                       die("invalid regular expression: %s",
+                           o->word_regex);
        }
        for (i = 0; i < ARRAY_SIZE(diff_words_styles); i++) {
                if (o->word_diff == diff_words_styles[i].type) {
@@ -1883,8 +2257,8 @@ static void init_diff_words_data(struct emit_callback *ecbdata,
        }
        if (want_color(o->use_color)) {
                struct diff_words_style *st = ecbdata->diff_words->style;
-               st->old.color = diff_get_color_opt(o, DIFF_FILE_OLD);
-               st->new.color = diff_get_color_opt(o, DIFF_FILE_NEW);
+               st->old_word.color = diff_get_color_opt(o, DIFF_FILE_OLD);
+               st->new_word.color = diff_get_color_opt(o, DIFF_FILE_NEW);
                st->ctx.color = diff_get_color_opt(o, DIFF_CONTEXT);
        }
 }
@@ -1924,7 +2298,7 @@ const char *diff_line_prefix(struct diff_options *opt)
        return msgbuf->buf;
 }
 
-static unsigned long sane_truncate_line(struct emit_callback *ecb, char *line, unsigned long len)
+static unsigned long sane_truncate_line(char *line, unsigned long len)
 {
        const char *cp;
        unsigned long allot;
@@ -1958,7 +2332,6 @@ static void find_lno(const char *line, struct emit_callback *ecbdata)
 static void fn_out_consume(void *priv, char *line, unsigned long len)
 {
        struct emit_callback *ecbdata = priv;
-       const char *reset = diff_get_color(ecbdata->color_diff, DIFF_RESET);
        struct diff_options *o = ecbdata->opt;
 
        o->found_changes = 1;
@@ -1989,7 +2362,7 @@ static void fn_out_consume(void *priv, char *line, unsigned long len)
        if (line[0] == '@') {
                if (ecbdata->diff_words)
                        diff_words_flush(ecbdata);
-               len = sane_truncate_line(ecbdata, line, len);
+               len = sane_truncate_line(line, len);
                find_lno(line, ecbdata);
                emit_hunk_header(ecbdata, line, len);
                return;
@@ -2025,16 +2398,16 @@ static void fn_out_consume(void *priv, char *line, unsigned long len)
        switch (line[0]) {
        case '+':
                ecbdata->lno_in_postimage++;
-               emit_add_line(reset, ecbdata, line + 1, len - 1);
+               emit_add_line(ecbdata, line + 1, len - 1);
                break;
        case '-':
                ecbdata->lno_in_preimage++;
-               emit_del_line(reset, ecbdata, line + 1, len - 1);
+               emit_del_line(ecbdata, line + 1, len - 1);
                break;
        case ' ':
                ecbdata->lno_in_postimage++;
                ecbdata->lno_in_preimage++;
-               emit_context_line(reset, ecbdata, line + 1, len - 1);
+               emit_context_line(ecbdata, line + 1, len - 1);
                break;
        default:
                /* incomplete line at the end */
@@ -2045,11 +2418,10 @@ static void fn_out_consume(void *priv, char *line, unsigned long len)
        }
 }
 
-static char *pprint_rename(const char *a, const char *b)
+static void pprint_rename(struct strbuf *name, const char *a, const char *b)
 {
-       const char *old = a;
-       const char *new = b;
-       struct strbuf name = STRBUF_INIT;
+       const char *old_name = a;
+       const char *new_name = b;
        int pfx_length, sfx_length;
        int pfx_adjust_for_slash;
        int len_a = strlen(a);
@@ -2059,24 +2431,24 @@ static char *pprint_rename(const char *a, const char *b)
        int qlen_b = quote_c_style(b, NULL, NULL, 0);
 
        if (qlen_a || qlen_b) {
-               quote_c_style(a, &name, NULL, 0);
-               strbuf_addstr(&name, " => ");
-               quote_c_style(b, &name, NULL, 0);
-               return strbuf_detach(&name, NULL);
+               quote_c_style(a, name, NULL, 0);
+               strbuf_addstr(name, " => ");
+               quote_c_style(b, name, NULL, 0);
+               return;
        }
 
        /* Find common prefix */
        pfx_length = 0;
-       while (*old && *new && *old == *new) {
-               if (*old == '/')
-                       pfx_length = old - a + 1;
-               old++;
-               new++;
+       while (*old_name && *new_name && *old_name == *new_name) {
+               if (*old_name == '/')
+                       pfx_length = old_name - a + 1;
+               old_name++;
+               new_name++;
        }
 
        /* Find common suffix */
-       old = a + len_a;
-       new = b + len_b;
+       old_name = a + len_a;
+       new_name = b + len_b;
        sfx_length = 0;
        /*
         * If there is a common prefix, it must end in a slash.  In
@@ -2087,13 +2459,13 @@ static char *pprint_rename(const char *a, const char *b)
         * underrun the input strings.
         */
        pfx_adjust_for_slash = (pfx_length ? 1 : 0);
-       while (a + pfx_length - pfx_adjust_for_slash <= old &&
-              b + pfx_length - pfx_adjust_for_slash <= new &&
-              *old == *new) {
-               if (*old == '/')
-                       sfx_length = len_a - (old - a);
-               old--;
-               new--;
+       while (a + pfx_length - pfx_adjust_for_slash <= old_name &&
+              b + pfx_length - pfx_adjust_for_slash <= new_name &&
+              *old_name == *new_name) {
+               if (*old_name == '/')
+                       sfx_length = len_a - (old_name - a);
+               old_name--;
+               new_name--;
        }
 
        /*
@@ -2109,35 +2481,19 @@ static char *pprint_rename(const char *a, const char *b)
        if (b_midlen < 0)
                b_midlen = 0;
 
-       strbuf_grow(&name, pfx_length + a_midlen + b_midlen + sfx_length + 7);
+       strbuf_grow(name, pfx_length + a_midlen + b_midlen + sfx_length + 7);
        if (pfx_length + sfx_length) {
-               strbuf_add(&name, a, pfx_length);
-               strbuf_addch(&name, '{');
+               strbuf_add(name, a, pfx_length);
+               strbuf_addch(name, '{');
        }
-       strbuf_add(&name, a + pfx_length, a_midlen);
-       strbuf_addstr(&name, " => ");
-       strbuf_add(&name, b + pfx_length, b_midlen);
+       strbuf_add(name, a + pfx_length, a_midlen);
+       strbuf_addstr(name, " => ");
+       strbuf_add(name, b + pfx_length, b_midlen);
        if (pfx_length + sfx_length) {
-               strbuf_addch(&name, '}');
-               strbuf_add(&name, a + len_a - sfx_length, sfx_length);
-       }
-       return strbuf_detach(&name, NULL);
-}
-
-struct diffstat_t {
-       int nr;
-       int alloc;
-       struct diffstat_file {
-               char *from_name;
-               char *name;
-               char *print_name;
-               unsigned is_unmerged:1;
-               unsigned is_binary:1;
-               unsigned is_renamed:1;
-               unsigned is_interesting:1;
-               uintmax_t added, deleted;
-       } **files;
-};
+               strbuf_addch(name, '}');
+               strbuf_add(name, a + len_a - sfx_length, sfx_length);
+       }
+}
 
 static struct diffstat_file *diffstat_add(struct diffstat_t *diffstat,
                                          const char *name_a,
@@ -2179,7 +2535,7 @@ static int scale_linear(int it, int width, int max_change)
        /*
         * make sure that at least one '-' or '+' is printed if
         * there is any change to this path. The easiest way is to
-        * scale linearly as if the alloted width is one column shorter
+        * scale linearly as if the allotted width is one column shorter
         * than it is, and then add 1 to the result.
         */
        return 1 + (it * (width - 1) / max_change);
@@ -2197,23 +2553,20 @@ static void show_graph(struct strbuf *out, char ch, int cnt,
 
 static void fill_print_name(struct diffstat_file *file)
 {
-       char *pname;
+       struct strbuf pname = STRBUF_INIT;
 
        if (file->print_name)
                return;
 
-       if (!file->is_renamed) {
-               struct strbuf buf = STRBUF_INIT;
-               if (quote_c_style(file->name, &buf, NULL, 0)) {
-                       pname = strbuf_detach(&buf, NULL);
-               } else {
-                       pname = file->name;
-                       strbuf_release(&buf);
-               }
-       } else {
-               pname = pprint_rename(file->from_name, file->name);
-       }
-       file->print_name = pname;
+       if (file->is_renamed)
+               pprint_rename(&pname, file->from_name, file->name);
+       else
+               quote_c_style(file->name, &pname, NULL, 0);
+
+       if (file->comments)
+               strbuf_addf(&pname, " (%s)", file->comments);
+
+       file->print_name = strbuf_detach(&pname, NULL);
 }
 
 static void print_stat_summary_inserts_deletes(struct diff_options *options,
@@ -2594,14 +2947,14 @@ struct dirstat_dir {
 static long gather_dirstat(struct diff_options *opt, struct dirstat_dir *dir,
                unsigned long changed, const char *base, int baselen)
 {
-       unsigned long this_dir = 0;
+       unsigned long sum_changes = 0;
        unsigned int sources = 0;
        const char *line_prefix = diff_line_prefix(opt);
 
        while (dir->nr) {
                struct dirstat_file *f = dir->files;
                int namelen = strlen(f->name);
-               unsigned long this;
+               unsigned long changes;
                char *slash;
 
                if (namelen < baselen)
@@ -2611,15 +2964,15 @@ static long gather_dirstat(struct diff_options *opt, struct dirstat_dir *dir,
                slash = strchr(f->name + baselen, '/');
                if (slash) {
                        int newbaselen = slash + 1 - f->name;
-                       this = gather_dirstat(opt, dir, changed, f->name, newbaselen);
+                       changes = gather_dirstat(opt, dir, changed, f->name, newbaselen);
                        sources++;
                } else {
-                       this = f->changed;
+                       changes = f->changed;
                        dir->files++;
                        dir->nr--;
                        sources += 2;
                }
-               this_dir += this;
+               sum_changes += changes;
        }
 
        /*
@@ -2629,8 +2982,8 @@ static long gather_dirstat(struct diff_options *opt, struct dirstat_dir *dir,
         *    under this directory (sources == 1).
         */
        if (baselen && sources != 1) {
-               if (this_dir) {
-                       int permille = this_dir * 1000 / changed;
+               if (sum_changes) {
+                       int permille = sum_changes * 1000 / changed;
                        if (permille >= dir->permille) {
                                fprintf(opt->file, "%s%4d.%01d%% %.*s\n", line_prefix,
                                        permille / 10, permille % 10, baselen, base);
@@ -2639,7 +2992,7 @@ static long gather_dirstat(struct diff_options *opt, struct dirstat_dir *dir,
                        }
                }
        }
-       return this_dir;
+       return sum_changes;
 }
 
 static int dirstat_compare(const void *_a, const void *_b)
@@ -2667,16 +3020,11 @@ static void show_dirstat(struct diff_options *options)
                struct diff_filepair *p = q->queue[i];
                const char *name;
                unsigned long copied, added, damage;
-               int content_changed;
 
                name = p->two->path ? p->two->path : p->one->path;
 
-               if (p->one->oid_valid && p->two->oid_valid)
-                       content_changed = oidcmp(&p->one->oid, &p->two->oid);
-               else
-                       content_changed = 1;
-
-               if (!content_changed) {
+               if (p->one->oid_valid && p->two->oid_valid &&
+                   oideq(&p->one->oid, &p->two->oid)) {
                        /*
                         * The SHA1 has not changed, so pre-/post-content is
                         * identical. We can therefore skip looking at the
@@ -2699,18 +3047,19 @@ static void show_dirstat(struct diff_options *options)
                }
 
                if (DIFF_FILE_VALID(p->one) && DIFF_FILE_VALID(p->two)) {
-                       diff_populate_filespec(p->one, 0);
-                       diff_populate_filespec(p->two, 0);
-                       diffcore_count_changes(p->one, p->two, NULL, NULL,
+                       diff_populate_filespec(options->repo, p->one, 0);
+                       diff_populate_filespec(options->repo, p->two, 0);
+                       diffcore_count_changes(options->repo,
+                                              p->one, p->two, NULL, NULL,
                                               &copied, &added);
                        diff_free_filespec_data(p->one);
                        diff_free_filespec_data(p->two);
                } else if (DIFF_FILE_VALID(p->one)) {
-                       diff_populate_filespec(p->one, CHECK_SIZE_ONLY);
+                       diff_populate_filespec(options->repo, p->one, CHECK_SIZE_ONLY);
                        copied = added = 0;
                        diff_free_filespec_data(p->one);
                } else if (DIFF_FILE_VALID(p->two)) {
-                       diff_populate_filespec(p->two, CHECK_SIZE_ONLY);
+                       diff_populate_filespec(options->repo, p->two, CHECK_SIZE_ONLY);
                        copied = 0;
                        added = p->two->size;
                        diff_free_filespec_data(p->two);
@@ -2723,7 +3072,7 @@ static void show_dirstat(struct diff_options *options)
                 * made to the preimage.
                 * If the resulting damage is zero, we know that
                 * diffcore_count_changes() considers the two entries to
-                * be identical, but since content_changed is true, we
+                * be identical, but since the oid changed, we
                 * know that there must have been _some_ kind of change,
                 * so we force all entries to have damage > 0.
                 */
@@ -2792,13 +3141,12 @@ static void show_dirstat_by_line(struct diffstat_t *data, struct diff_options *o
        gather_dirstat(options, &dir, changed, "", 0);
 }
 
-static void free_diffstat_info(struct diffstat_t *diffstat)
+void free_diffstat_info(struct diffstat_t *diffstat)
 {
        int i;
        for (i = 0; i < diffstat->nr; i++) {
                struct diffstat_file *f = diffstat->files[i];
-               if (f->name != f->print_name)
-                       free(f->print_name);
+               free(f->print_name);
                free(f->name);
                free(f->from_name);
                free(f);
@@ -2832,12 +3180,21 @@ static int is_conflict_marker(const char *line, int marker_size, unsigned long l
        for (cnt = 1; cnt < marker_size; cnt++)
                if (line[cnt] != firstchar)
                        return 0;
-       /* line[1] thru line[marker_size-1] are same as firstchar */
+       /* line[1] through line[marker_size-1] are same as firstchar */
        if (len < marker_size + 1 || !isspace(line[marker_size]))
                return 0;
        return 1;
 }
 
+static void checkdiff_consume_hunk(void *priv,
+                                  long ob, long on, long nb, long nn,
+                                  const char *func, long funclen)
+
+{
+       struct checkdiff_t *data = priv;
+       data->lineno = nb - 1;
+}
+
 static void checkdiff_consume(void *priv, char *line, unsigned long len)
 {
        struct checkdiff_t *data = priv;
@@ -2873,12 +3230,6 @@ static void checkdiff_consume(void *priv, char *line, unsigned long len)
                              data->o->file, set, reset, ws);
        } else if (line[0] == ' ') {
                data->lineno++;
-       } else if (line[0] == '@') {
-               char *plus = strchr(line, '+');
-               if (plus)
-                       data->lineno = strtol(plus, NULL, 10) - 1;
-               else
-                       die("invalid diff");
        }
 }
 
@@ -2935,7 +3286,7 @@ static void emit_binary_diff_body(struct diff_options *o,
        }
 
        if (delta && delta_size < deflate_size) {
-               char *s = xstrfmt("%lu", orig_size);
+               char *s = xstrfmt("%"PRIuMAX , (uintmax_t)orig_size);
                emit_diff_symbol(o, DIFF_SYMBOL_BINARY_DIFF_HEADER_DELTA,
                                 s, strlen(s), 0);
                free(s);
@@ -2985,15 +3336,16 @@ static void emit_binary_diff(struct diff_options *o,
        emit_binary_diff_body(o, two, one);
 }
 
-int diff_filespec_is_binary(struct diff_filespec *one)
+int diff_filespec_is_binary(struct repository *r,
+                           struct diff_filespec *one)
 {
        if (one->is_binary == -1) {
-               diff_filespec_load_driver(one);
+               diff_filespec_load_driver(one, r->index);
                if (one->driver->binary != -1)
                        one->is_binary = one->driver->binary;
                else {
                        if (!one->data && DIFF_FILE_VALID(one))
-                               diff_populate_filespec(one, CHECK_BINARY);
+                               diff_populate_filespec(r, one, CHECK_BINARY);
                        if (one->is_binary == -1 && one->data)
                                one->is_binary = buffer_is_binary(one->data,
                                                one->size);
@@ -3004,9 +3356,10 @@ int diff_filespec_is_binary(struct diff_filespec *one)
        return one->is_binary;
 }
 
-static const struct userdiff_funcname *diff_funcname_pattern(struct diff_filespec *one)
+static const struct userdiff_funcname *
+diff_funcname_pattern(struct diff_options *o, struct diff_filespec *one)
 {
-       diff_filespec_load_driver(one);
+       diff_filespec_load_driver(one, o->repo->index);
        return one->driver->funcname.pattern ? &one->driver->funcname : NULL;
 }
 
@@ -3018,13 +3371,14 @@ void diff_set_mnemonic_prefix(struct diff_options *options, const char *a, const
                options->b_prefix = b;
 }
 
-struct userdiff_driver *get_textconv(struct diff_filespec *one)
+struct userdiff_driver *get_textconv(struct repository *r,
+                                    struct diff_filespec *one)
 {
        if (!DIFF_FILE_VALID(one))
                return NULL;
 
-       diff_filespec_load_driver(one);
-       return userdiff_get_textconv(one->driver);
+       diff_filespec_load_driver(one, r->index);
+       return userdiff_get_textconv(r, one->driver);
 }
 
 static void builtin_diff(const char *name_a,
@@ -3073,8 +3427,8 @@ static void builtin_diff(const char *name_a,
        }
 
        if (o->flags.allow_textconv) {
-               textconv_one = get_textconv(one);
-               textconv_two = get_textconv(two);
+               textconv_one = get_textconv(o->repo, one);
+               textconv_two = get_textconv(o->repo, two);
        }
 
        /* Never use a non-valid filename anywhere if at all possible */
@@ -3115,13 +3469,13 @@ static void builtin_diff(const char *name_a,
                if ((one->mode ^ two->mode) & S_IFMT)
                        goto free_ab_and_return;
                if (complete_rewrite &&
-                   (textconv_one || !diff_filespec_is_binary(one)) &&
-                   (textconv_two || !diff_filespec_is_binary(two))) {
+                   (textconv_one || !diff_filespec_is_binary(o->repo, one)) &&
+                   (textconv_two || !diff_filespec_is_binary(o->repo, two))) {
                        emit_diff_symbol(o, DIFF_SYMBOL_HEADER,
                                         header.buf, header.len, 0);
                        strbuf_reset(&header);
                        emit_rewrite_diff(name_a, name_b, one, two,
-                                               textconv_one, textconv_two, o);
+                                         textconv_one, textconv_two, o);
                        o->found_changes = 1;
                        goto free_ab_and_return;
                }
@@ -3133,13 +3487,13 @@ static void builtin_diff(const char *name_a,
                strbuf_reset(&header);
                goto free_ab_and_return;
        } else if (!o->flags.text &&
-           ( (!textconv_one && diff_filespec_is_binary(one)) ||
-             (!textconv_two && diff_filespec_is_binary(two)) )) {
+                  ( (!textconv_one && diff_filespec_is_binary(o->repo, one)) ||
+                    (!textconv_two && diff_filespec_is_binary(o->repo, two)) )) {
                struct strbuf sb = STRBUF_INIT;
                if (!one->data && !two->data &&
                    S_ISREG(one->mode) && S_ISREG(two->mode) &&
                    !o->flags.binary) {
-                       if (!oidcmp(&one->oid, &two->oid)) {
+                       if (oideq(&one->oid, &two->oid)) {
                                if (must_show_header)
                                        emit_diff_symbol(o, DIFF_SYMBOL_HEADER,
                                                         header.buf, header.len,
@@ -3155,7 +3509,8 @@ static void builtin_diff(const char *name_a,
                        strbuf_release(&sb);
                        goto free_ab_and_return;
                }
-               if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
+               if (fill_mmfile(o->repo, &mf1, one) < 0 ||
+                   fill_mmfile(o->repo, &mf2, two) < 0)
                        die("unable to read files to diff");
                /* Quite common confusing case */
                if (mf1.size == mf2.size &&
@@ -3179,7 +3534,7 @@ static void builtin_diff(const char *name_a,
                o->found_changes = 1;
        } else {
                /* Crazy xdl interfaces.. */
-               const char *diffopts = getenv("GIT_DIFF_OPTS");
+               const char *diffopts;
                const char *v;
                xpparam_t xpp;
                xdemitconf_t xecfg;
@@ -3192,23 +3547,26 @@ static void builtin_diff(const char *name_a,
                        strbuf_reset(&header);
                }
 
-               mf1.size = fill_textconv(textconv_one, one, &mf1.ptr);
-               mf2.size = fill_textconv(textconv_two, two, &mf2.ptr);
+               mf1.size = fill_textconv(o->repo, textconv_one, one, &mf1.ptr);
+               mf2.size = fill_textconv(o->repo, textconv_two, two, &mf2.ptr);
 
-               pe = diff_funcname_pattern(one);
+               pe = diff_funcname_pattern(o, one);
                if (!pe)
-                       pe = diff_funcname_pattern(two);
+                       pe = diff_funcname_pattern(o, two);
 
                memset(&xpp, 0, sizeof(xpp));
                memset(&xecfg, 0, sizeof(xecfg));
                memset(&ecbdata, 0, sizeof(ecbdata));
+               if (o->flags.suppress_diff_headers)
+                       lbl[0] = NULL;
                ecbdata.label_path = lbl;
                ecbdata.color_diff = want_color(o->use_color);
-               ecbdata.ws_rule = whitespace_rule(name_b);
+               ecbdata.ws_rule = whitespace_rule(o->repo->index, name_b);
                if (ecbdata.ws_rule & WS_BLANK_AT_EOF)
                        check_blank_at_eof(&mf1, &mf2, &ecbdata);
                ecbdata.opt = o;
-               ecbdata.header = header.len ? &header : NULL;
+               if (header.len && !o->flags.suppress_diff_headers)
+                       ecbdata.header = &header;
                xpp.flags = o->xdl_opts;
                xpp.anchors = o->anchors;
                xpp.anchors_nr = o->anchors_nr;
@@ -3219,16 +3577,19 @@ static void builtin_diff(const char *name_a,
                        xecfg.flags |= XDL_EMIT_FUNCCONTEXT;
                if (pe)
                        xdiff_set_find_func(&xecfg, pe->pattern, pe->cflags);
+
+               diffopts = getenv("GIT_DIFF_OPTS");
                if (!diffopts)
                        ;
                else if (skip_prefix(diffopts, "--unified=", &v))
                        xecfg.ctxlen = strtoul(v, NULL, 10);
                else if (skip_prefix(diffopts, "-u", &v))
                        xecfg.ctxlen = strtoul(v, NULL, 10);
+
                if (o->word_diff)
                        init_diff_words_data(&ecbdata, o, one, two);
-               if (xdi_diff_outf(&mf1, &mf2, fn_out_consume, &ecbdata,
-                                 &xpp, &xecfg))
+               if (xdi_diff_outf(&mf1, &mf2, NULL, fn_out_consume,
+                                 &ecbdata, &xpp, &xecfg))
                        die("unable to generate diff for %s", one->path);
                if (o->word_diff)
                        free_diff_words_data(&ecbdata);
@@ -3248,6 +3609,32 @@ static void builtin_diff(const char *name_a,
        return;
 }
 
+static char *get_compact_summary(const struct diff_filepair *p, int is_renamed)
+{
+       if (!is_renamed) {
+               if (p->status == DIFF_STATUS_ADDED) {
+                       if (S_ISLNK(p->two->mode))
+                               return "new +l";
+                       else if ((p->two->mode & 0777) == 0755)
+                               return "new +x";
+                       else
+                               return "new";
+               } else if (p->status == DIFF_STATUS_DELETED)
+                       return "gone";
+       }
+       if (S_ISLNK(p->one->mode) && !S_ISLNK(p->two->mode))
+               return "mode -l";
+       else if (!S_ISLNK(p->one->mode) && S_ISLNK(p->two->mode))
+               return "mode +l";
+       else if ((p->one->mode & 0777) == 0644 &&
+                (p->two->mode & 0777) == 0755)
+               return "mode +x";
+       else if ((p->one->mode & 0777) == 0755 &&
+                (p->two->mode & 0777) == 0644)
+               return "mode -x";
+       return NULL;
+}
+
 static void builtin_diffstat(const char *name_a, const char *name_b,
                             struct diff_filespec *one,
                             struct diff_filespec *two,
@@ -3267,28 +3654,31 @@ static void builtin_diffstat(const char *name_a, const char *name_b,
 
        data = diffstat_add(diffstat, name_a, name_b);
        data->is_interesting = p->status != DIFF_STATUS_UNKNOWN;
+       if (o->flags.stat_with_summary)
+               data->comments = get_compact_summary(p, data->is_renamed);
 
        if (!one || !two) {
                data->is_unmerged = 1;
                return;
        }
 
-       same_contents = !oidcmp(&one->oid, &two->oid);
+       same_contents = oideq(&one->oid, &two->oid);
 
-       if (diff_filespec_is_binary(one) || diff_filespec_is_binary(two)) {
+       if (diff_filespec_is_binary(o->repo, one) ||
+           diff_filespec_is_binary(o->repo, two)) {
                data->is_binary = 1;
                if (same_contents) {
                        data->added = 0;
                        data->deleted = 0;
                } else {
-                       data->added = diff_filespec_size(two);
-                       data->deleted = diff_filespec_size(one);
+                       data->added = diff_filespec_size(o->repo, two);
+                       data->deleted = diff_filespec_size(o->repo, one);
                }
        }
 
        else if (complete_rewrite) {
-               diff_populate_filespec(one, 0);
-               diff_populate_filespec(two, 0);
+               diff_populate_filespec(o->repo, one, 0);
+               diff_populate_filespec(o->repo, two, 0);
                data->deleted = count_lines(one->data, one->size);
                data->added = count_lines(two->data, two->size);
        }
@@ -3298,7 +3688,8 @@ static void builtin_diffstat(const char *name_a, const char *name_b,
                xpparam_t xpp;
                xdemitconf_t xecfg;
 
-               if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
+               if (fill_mmfile(o->repo, &mf1, one) < 0 ||
+                   fill_mmfile(o->repo, &mf2, two) < 0)
                        die("unable to read files to diff");
 
                memset(&xpp, 0, sizeof(xpp));
@@ -3308,8 +3699,8 @@ static void builtin_diffstat(const char *name_a, const char *name_b,
                xpp.anchors_nr = o->anchors_nr;
                xecfg.ctxlen = o->context;
                xecfg.interhunkctxlen = o->interhunkcontext;
-               if (xdi_diff_outf(&mf1, &mf2, diffstat_consume, diffstat,
-                                 &xpp, &xecfg))
+               if (xdi_diff_outf(&mf1, &mf2, discard_hunk_line,
+                                 diffstat_consume, diffstat, &xpp, &xecfg))
                        die("unable to generate diffstat for %s", one->path);
        }
 
@@ -3333,10 +3724,11 @@ static void builtin_checkdiff(const char *name_a, const char *name_b,
        data.filename = name_b ? name_b : name_a;
        data.lineno = 0;
        data.o = o;
-       data.ws_rule = whitespace_rule(attr_path);
-       data.conflict_marker_size = ll_merge_marker_size(attr_path);
+       data.ws_rule = whitespace_rule(o->repo->index, attr_path);
+       data.conflict_marker_size = ll_merge_marker_size(o->repo->index, attr_path);
 
-       if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
+       if (fill_mmfile(o->repo, &mf1, one) < 0 ||
+           fill_mmfile(o->repo, &mf2, two) < 0)
                die("unable to read files to diff");
 
        /*
@@ -3345,7 +3737,7 @@ static void builtin_checkdiff(const char *name_a, const char *name_b,
         * introduced changes, and as long as the "new" side is text, we
         * can and should check what it introduces.
         */
-       if (diff_filespec_is_binary(two))
+       if (diff_filespec_is_binary(o->repo, two))
                goto free_and_return;
        else {
                /* Crazy xdl interfaces.. */
@@ -3356,7 +3748,8 @@ static void builtin_checkdiff(const char *name_a, const char *name_b,
                memset(&xecfg, 0, sizeof(xecfg));
                xecfg.ctxlen = 1; /* at least one context line */
                xpp.flags = 0;
-               if (xdi_diff_outf(&mf1, &mf2, checkdiff_consume, &data,
+               if (xdi_diff_outf(&mf1, &mf2, checkdiff_consume_hunk,
+                                 checkdiff_consume, &data,
                                  &xpp, &xecfg))
                        die("unable to generate checkdiff for %s", one->path);
 
@@ -3418,7 +3811,10 @@ void fill_filespec(struct diff_filespec *spec, const struct object_id *oid,
  * the work tree has that object contents, return true, so that
  * prepare_temp_file() does not have to inflate and extract.
  */
-static int reuse_worktree_file(const char *name, const struct object_id *oid, int want_file)
+static int reuse_worktree_file(struct index_state *istate,
+                              const char *name,
+                              const struct object_id *oid,
+                              int want_file)
 {
        const struct cache_entry *ce;
        struct stat st;
@@ -3437,7 +3833,7 @@ static int reuse_worktree_file(const char *name, const struct object_id *oid, in
         * by diff-cache --cached, which does read the cache before
         * calling us.
         */
-       if (!active_cache)
+       if (!istate->cache)
                return 0;
 
        /* We want to avoid the working directory if our caller
@@ -3449,27 +3845,27 @@ static int reuse_worktree_file(const char *name, const struct object_id *oid, in
         * objects however would tend to be slower as they need
         * to be individually opened and inflated.
         */
-       if (!FAST_WORKING_DIRECTORY && !want_file && has_sha1_pack(oid->hash))
+       if (!FAST_WORKING_DIRECTORY && !want_file && has_object_pack(oid))
                return 0;
 
        /*
         * Similarly, if we'd have to convert the file contents anyway, that
         * makes the optimization not worthwhile.
         */
-       if (!want_file && would_convert_to_git(&the_index, name))
+       if (!want_file && would_convert_to_git(istate, name))
                return 0;
 
        len = strlen(name);
-       pos = cache_name_pos(name, len);
+       pos = index_name_pos(istate, name, len);
        if (pos < 0)
                return 0;
-       ce = active_cache[pos];
+       ce = istate->cache[pos];
 
        /*
         * This is not the sha1 we are looking for, or
         * unreusable because it is not a regular file.
         */
-       if (oidcmp(oid, &ce->oid) || !S_ISREG(ce->ce_mode))
+       if (!oideq(oid, &ce->oid) || !S_ISREG(ce->ce_mode))
                return 0;
 
        /*
@@ -3483,7 +3879,7 @@ static int reuse_worktree_file(const char *name, const struct object_id *oid, in
         * If ce matches the file in the work tree, we can reuse it.
         */
        if (ce_uptodate(ce) ||
-           (!lstat(name, &st) && !ce_match_stat(ce, &st, 0)))
+           (!lstat(name, &st) && !ie_match_stat(istate, ce, &st, 0)))
                return 1;
 
        return 0;
@@ -3516,17 +3912,19 @@ static int diff_populate_gitlink(struct diff_filespec *s, int size_only)
  * grab the data for the blob (or file) for our own in-core comparison.
  * diff_filespec has data and size fields for this purpose.
  */
-int diff_populate_filespec(struct diff_filespec *s, unsigned int flags)
+int diff_populate_filespec(struct repository *r,
+                          struct diff_filespec *s,
+                          unsigned int flags)
 {
        int size_only = flags & CHECK_SIZE_ONLY;
        int err = 0;
+       int conv_flags = global_conv_flags_eol;
        /*
         * demote FAIL to WARN to allow inspecting the situation
         * instead of refusing.
         */
-       enum safe_crlf crlf_warn = (safe_crlf == SAFE_CRLF_FAIL
-                                   ? SAFE_CRLF_WARN
-                                   : safe_crlf);
+       if (conv_flags & CONV_EOL_RNDTRP_DIE)
+               conv_flags = CONV_EOL_RNDTRP_WARN;
 
        if (!DIFF_FILE_VALID(s))
                die("internal error: asking to populate invalid file.");
@@ -3543,7 +3941,7 @@ int diff_populate_filespec(struct diff_filespec *s, unsigned int flags)
                return diff_populate_gitlink(s, size_only);
 
        if (!s->oid_valid ||
-           reuse_worktree_file(s->path, &s->oid, 0)) {
+           reuse_worktree_file(r->index, s->path, &s->oid, 0)) {
                struct strbuf buf = STRBUF_INIT;
                struct stat st;
                int fd;
@@ -3576,7 +3974,7 @@ int diff_populate_filespec(struct diff_filespec *s, unsigned int flags)
                 * point if the path requires us to run the content
                 * conversion.
                 */
-               if (size_only && !would_convert_to_git(&the_index, s->path))
+               if (size_only && !would_convert_to_git(r->index, s->path))
                        return 0;
 
                /*
@@ -3603,7 +4001,7 @@ int diff_populate_filespec(struct diff_filespec *s, unsigned int flags)
                /*
                 * Convert from working tree format to canonical git format
                 */
-               if (convert_to_git(&the_index, s->path, s->data, s->size, &buf, crlf_warn)) {
+               if (convert_to_git(r->index, s->path, s->data, s->size, &buf, conv_flags)) {
                        size_t size = 0;
                        munmap(s->data, s->size);
                        s->should_munmap = 0;
@@ -3615,7 +4013,7 @@ int diff_populate_filespec(struct diff_filespec *s, unsigned int flags)
        else {
                enum object_type type;
                if (size_only || (flags & CHECK_BINARY)) {
-                       type = sha1_object_info(s->oid.hash, &s->size);
+                       type = oid_object_info(r, &s->oid, &s->size);
                        if (type < 0)
                                die("unable to read %s",
                                    oid_to_hex(&s->oid));
@@ -3626,7 +4024,7 @@ int diff_populate_filespec(struct diff_filespec *s, unsigned int flags)
                                return 0;
                        }
                }
-               s->data = read_sha1_file(s->oid.hash, &type, &s->size);
+               s->data = read_object_file(&s->oid, &type, &s->size);
                if (!s->data)
                        die("unable to read %s", oid_to_hex(&s->oid));
                s->should_free = 1;
@@ -3653,25 +4051,26 @@ void diff_free_filespec_data(struct diff_filespec *s)
        FREE_AND_NULL(s->cnt_data);
 }
 
-static void prep_temp_blob(const char *path, struct diff_tempfile *temp,
+static void prep_temp_blob(struct index_state *istate,
+                          const char *path, struct diff_tempfile *temp,
                           void *blob,
                           unsigned long size,
                           const struct object_id *oid,
                           int mode)
 {
        struct strbuf buf = STRBUF_INIT;
-       struct strbuf template = STRBUF_INIT;
+       struct strbuf tempfile = STRBUF_INIT;
        char *path_dup = xstrdup(path);
        const char *base = basename(path_dup);
 
        /* Generate "XXXXXX_basename.ext" */
-       strbuf_addstr(&template, "XXXXXX_");
-       strbuf_addstr(&template, base);
+       strbuf_addstr(&tempfile, "XXXXXX_");
+       strbuf_addstr(&tempfile, base);
 
-       temp->tempfile = mks_tempfile_ts(template.buf, strlen(base) + 1);
+       temp->tempfile = mks_tempfile_ts(tempfile.buf, strlen(base) + 1);
        if (!temp->tempfile)
                die_errno("unable to create temp-file");
-       if (convert_to_working_tree(path,
+       if (convert_to_working_tree(istate, path,
                        (const char *)blob, (size_t)size, &buf)) {
                blob = buf.buf;
                size = buf.len;
@@ -3683,12 +4082,13 @@ static void prep_temp_blob(const char *path, struct diff_tempfile *temp,
        oid_to_hex_r(temp->hex, oid);
        xsnprintf(temp->mode, sizeof(temp->mode), "%06o", mode);
        strbuf_release(&buf);
-       strbuf_release(&template);
+       strbuf_release(&tempfile);
        free(path_dup);
 }
 
-static struct diff_tempfile *prepare_temp_file(const char *name,
-               struct diff_filespec *one)
+static struct diff_tempfile *prepare_temp_file(struct repository *r,
+                                              const char *name,
+                                              struct diff_filespec *one)
 {
        struct diff_tempfile *temp = claim_diff_tempfile();
 
@@ -3705,7 +4105,7 @@ static struct diff_tempfile *prepare_temp_file(const char *name,
 
        if (!S_ISGITLINK(one->mode) &&
            (!one->oid_valid ||
-            reuse_worktree_file(name, &one->oid, 1))) {
+            reuse_worktree_file(r->index, name, &one->oid, 1))) {
                struct stat st;
                if (lstat(name, &st) < 0) {
                        if (errno == ENOENT)
@@ -3716,7 +4116,7 @@ static struct diff_tempfile *prepare_temp_file(const char *name,
                        struct strbuf sb = STRBUF_INIT;
                        if (strbuf_readlink(&sb, name, st.st_size) < 0)
                                die_errno("readlink(%s)", name);
-                       prep_temp_blob(name, temp, sb.buf, sb.len,
+                       prep_temp_blob(r->index, name, temp, sb.buf, sb.len,
                                       (one->oid_valid ?
                                        &one->oid : &null_oid),
                                       (one->oid_valid ?
@@ -3741,19 +4141,21 @@ static struct diff_tempfile *prepare_temp_file(const char *name,
                return temp;
        }
        else {
-               if (diff_populate_filespec(one, 0))
+               if (diff_populate_filespec(r, one, 0))
                        die("cannot read data blob for %s", one->path);
-               prep_temp_blob(name, temp, one->data, one->size,
+               prep_temp_blob(r->index, name, temp,
+                              one->data, one->size,
                               &one->oid, one->mode);
        }
        return temp;
 }
 
-static void add_external_diff_name(struct argv_array *argv,
+static void add_external_diff_name(struct repository *r,
+                                  struct argv_array *argv,
                                   const char *name,
                                   struct diff_filespec *df)
 {
-       struct diff_tempfile *temp = prepare_temp_file(name, df);
+       struct diff_tempfile *temp = prepare_temp_file(r, name, df);
        argv_array_push(argv, temp->name);
        argv_array_push(argv, temp->hex);
        argv_array_push(argv, temp->mode);
@@ -3771,7 +4173,6 @@ static void run_external_diff(const char *pgm,
                              struct diff_filespec *one,
                              struct diff_filespec *two,
                              const char *xfrm_msg,
-                             int complete_rewrite,
                              struct diff_options *o)
 {
        struct argv_array argv = ARGV_ARRAY_INIT;
@@ -3782,11 +4183,11 @@ static void run_external_diff(const char *pgm,
        argv_array_push(&argv, name);
 
        if (one && two) {
-               add_external_diff_name(&argv, name, one);
+               add_external_diff_name(o->repo, &argv, name, one);
                if (!other)
-                       add_external_diff_name(&argv, name, two);
+                       add_external_diff_name(o->repo, &argv, name, two);
                else {
-                       add_external_diff_name(&argv, other, two);
+                       add_external_diff_name(o->repo, &argv, other, two);
                        argv_array_push(&argv, other);
                        argv_array_push(&argv, xfrm_msg);
                }
@@ -3795,6 +4196,8 @@ static void run_external_diff(const char *pgm,
        argv_array_pushf(&env, "GIT_DIFF_PATH_COUNTER=%d", ++o->diff_path_counter);
        argv_array_pushf(&env, "GIT_DIFF_PATH_TOTAL=%d", q->nr);
 
+       diff_free_filespec_data(one);
+       diff_free_filespec_data(two);
        if (run_command_v_opt_cd_env(argv.argv, RUN_USING_SHELL, NULL, env.argv))
                die(_("external diff died, stopping at %s"), name);
 
@@ -3811,13 +4214,13 @@ static int similarity_index(struct diff_filepair *p)
 static const char *diff_abbrev_oid(const struct object_id *oid, int abbrev)
 {
        if (startup_info->have_repository)
-               return find_unique_abbrev(oid->hash, abbrev);
+               return find_unique_abbrev(oid, abbrev);
        else {
                char *hex = oid_to_hex(oid);
                if (abbrev < 0)
                        abbrev = FALLBACK_DEFAULT_ABBREV;
-               if (abbrev > GIT_SHA1_HEXSZ)
-                       die("BUG: oid abbreviation out of range: %d", abbrev);
+               if (abbrev > the_hash_algo->hexsz)
+                       BUG("oid abbreviation out of range: %d", abbrev);
                if (abbrev)
                        hex[abbrev] = '\0';
                return hex;
@@ -3873,14 +4276,17 @@ static void fill_metainfo(struct strbuf *msg,
        default:
                *must_show_header = 0;
        }
-       if (one && two && oidcmp(&one->oid, &two->oid)) {
-               int abbrev = o->flags.full_index ? 40 : DEFAULT_ABBREV;
+       if (one && two && !oideq(&one->oid, &two->oid)) {
+               const unsigned hexsz = the_hash_algo->hexsz;
+               int abbrev = o->flags.full_index ? hexsz : DEFAULT_ABBREV;
 
                if (o->flags.binary) {
                        mmfile_t mf;
-                       if ((!fill_mmfile(&mf, one) && diff_filespec_is_binary(one)) ||
-                           (!fill_mmfile(&mf, two) && diff_filespec_is_binary(two)))
-                               abbrev = 40;
+                       if ((!fill_mmfile(o->repo, &mf, one) &&
+                            diff_filespec_is_binary(o->repo, one)) ||
+                           (!fill_mmfile(o->repo, &mf, two) &&
+                            diff_filespec_is_binary(o->repo, two)))
+                               abbrev = hexsz;
                }
                strbuf_addf(msg, "%s%sindex %s..%s", line_prefix, set,
                            diff_abbrev_oid(&one->oid, abbrev),
@@ -3907,7 +4313,9 @@ static void run_diff_cmd(const char *pgm,
 
 
        if (o->flags.allow_external) {
-               struct userdiff_driver *drv = userdiff_find_by_path(attr_path);
+               struct userdiff_driver *drv;
+
+               drv = userdiff_find_by_path(o->repo->index, attr_path);
                if (drv && drv->external)
                        pgm = drv->external;
        }
@@ -3924,8 +4332,7 @@ static void run_diff_cmd(const char *pgm,
        }
 
        if (pgm) {
-               run_external_diff(pgm, name, other, one, two, xfrm_msg,
-                                 complete_rewrite, o);
+               run_external_diff(pgm, name, other, one, two, xfrm_msg, o);
                return;
        }
        if (one && two)
@@ -3936,7 +4343,7 @@ static void run_diff_cmd(const char *pgm,
                fprintf(o->file, "* Unmerged path %s\n", name);
 }
 
-static void diff_fill_oid_info(struct diff_filespec *one)
+static void diff_fill_oid_info(struct diff_filespec *one, struct index_state *istate)
 {
        if (DIFF_FILE_VALID(one)) {
                if (!one->oid_valid) {
@@ -3947,7 +4354,7 @@ static void diff_fill_oid_info(struct diff_filespec *one)
                        }
                        if (lstat(one->path, &st) < 0)
                                die_errno("stat '%s'", one->path);
-                       if (index_path(&one->oid, one->path, &st, 0))
+                       if (index_path(istate, &one->oid, one->path, &st, 0))
                                die("cannot hash %s", one->path);
                }
        }
@@ -3958,12 +4365,12 @@ static void diff_fill_oid_info(struct diff_filespec *one)
 static void strip_prefix(int prefix_length, const char **namep, const char **otherp)
 {
        /* Strip the prefix but do not molest /dev/null and absolute paths */
-       if (*namep && **namep != '/') {
+       if (*namep && !is_absolute_path(*namep)) {
                *namep += prefix_length;
                if (**namep == '/')
                        ++*namep;
        }
-       if (*otherp && **otherp != '/') {
+       if (*otherp && !is_absolute_path(*otherp)) {
                *otherp += prefix_length;
                if (**otherp == '/')
                        ++*otherp;
@@ -3995,8 +4402,8 @@ static void run_diff(struct diff_filepair *p, struct diff_options *o)
                return;
        }
 
-       diff_fill_oid_info(one);
-       diff_fill_oid_info(two);
+       diff_fill_oid_info(one, o->repo->index);
+       diff_fill_oid_info(two, o->repo->index);
 
        if (!pgm &&
            DIFF_FILE_VALID(one) && DIFF_FILE_VALID(two) &&
@@ -4007,7 +4414,8 @@ static void run_diff(struct diff_filepair *p, struct diff_options *o)
                 */
                struct diff_filespec *null = alloc_filespec(two->path);
                run_diff_cmd(NULL, name, other, attr_path,
-                            one, null, &msg, o, p);
+                            one, null, &msg,
+                            o, p);
                free(null);
                strbuf_release(&msg);
 
@@ -4031,7 +4439,8 @@ static void run_diffstat(struct diff_filepair *p, struct diff_options *o,
 
        if (DIFF_PAIR_UNMERGED(p)) {
                /* unmerged */
-               builtin_diffstat(p->one->path, NULL, NULL, NULL, diffstat, o, p);
+               builtin_diffstat(p->one->path, NULL, NULL, NULL,
+                                diffstat, o, p);
                return;
        }
 
@@ -4041,10 +4450,11 @@ static void run_diffstat(struct diff_filepair *p, struct diff_options *o,
        if (o->prefix_length)
                strip_prefix(o->prefix_length, &name, &other);
 
-       diff_fill_oid_info(p->one);
-       diff_fill_oid_info(p->two);
+       diff_fill_oid_info(p->one, o->repo->index);
+       diff_fill_oid_info(p->two, o->repo->index);
 
-       builtin_diffstat(name, other, p->one, p->two, diffstat, o, p);
+       builtin_diffstat(name, other, p->one, p->two,
+                        diffstat, o, p);
 }
 
 static void run_checkdiff(struct diff_filepair *p, struct diff_options *o)
@@ -4065,18 +4475,24 @@ static void run_checkdiff(struct diff_filepair *p, struct diff_options *o)
        if (o->prefix_length)
                strip_prefix(o->prefix_length, &name, &other);
 
-       diff_fill_oid_info(p->one);
-       diff_fill_oid_info(p->two);
+       diff_fill_oid_info(p->one, o->repo->index);
+       diff_fill_oid_info(p->two, o->repo->index);
 
        builtin_checkdiff(name, other, attr_path, p->one, p->two, o);
 }
 
-void diff_setup(struct diff_options *options)
+static void prep_parse_options(struct diff_options *options);
+
+void repo_diff_setup(struct repository *r, struct diff_options *options)
 {
        memcpy(options, &default_diff_options, sizeof(*options));
 
        options->file = stdout;
+       options->repo = r;
 
+       options->output_indicators[OUTPUT_INDICATOR_NEW] = '+';
+       options->output_indicators[OUTPUT_INDICATOR_OLD] = '-';
+       options->output_indicators[OUTPUT_INDICATOR_CONTEXT] = ' ';
        options->abbrev = DEFAULT_ABBREV;
        options->line_termination = '\n';
        options->break_opt = -1;
@@ -4086,6 +4502,7 @@ void diff_setup(struct diff_options *options)
        options->interhunkcontext = diff_interhunk_context_default;
        options->ws_error_highlight = ws_error_highlight_default;
        options->flags.rename_empty = 1;
+       options->objfind = NULL;
 
        /* pathchange left =NULL by default */
        options->change = diff_change;
@@ -4106,26 +4523,32 @@ void diff_setup(struct diff_options *options)
        }
 
        options->color_moved = diff_color_moved_default;
+       options->color_moved_ws_handling = diff_color_moved_ws_default;
+
+       prep_parse_options(options);
 }
 
 void diff_setup_done(struct diff_options *options)
 {
-       int count = 0;
+       unsigned check_mask = DIFF_FORMAT_NAME |
+                             DIFF_FORMAT_NAME_STATUS |
+                             DIFF_FORMAT_CHECKDIFF |
+                             DIFF_FORMAT_NO_OUTPUT;
+       /*
+        * This must be signed because we're comparing against a potentially
+        * negative value.
+        */
+       const int hexsz = the_hash_algo->hexsz;
 
        if (options->set_default)
                options->set_default(options);
 
-       if (options->output_format & DIFF_FORMAT_NAME)
-               count++;
-       if (options->output_format & DIFF_FORMAT_NAME_STATUS)
-               count++;
-       if (options->output_format & DIFF_FORMAT_CHECKDIFF)
-               count++;
-       if (options->output_format & DIFF_FORMAT_NO_OUTPUT)
-               count++;
-       if (count > 1)
+       if (HAS_MULTI_BITS(options->output_format & check_mask))
                die(_("--name-only, --name-status, --check and -s are mutually exclusive"));
 
+       if (HAS_MULTI_BITS(options->pickaxe_opts & DIFF_PICKAXE_KINDS_MASK))
+               die(_("-G, -S and --find-object are mutually exclusive"));
+
        /*
         * Most of the time we can say "there are changes"
         * only by checking if there are changed paths, but
@@ -4175,7 +4598,7 @@ void diff_setup_done(struct diff_options *options)
        /*
         * Also pickaxe would not work very well if you do not say recursive
         */
-       if (options->pickaxe)
+       if (options->pickaxe_opts & DIFF_PICKAXE_KINDS_MASK)
                options->flags.recursive = 1;
        /*
         * When patches are generated, submodules diffed against the work tree
@@ -4186,18 +4609,8 @@ void diff_setup_done(struct diff_options *options)
 
        if (options->detect_rename && options->rename_limit < 0)
                options->rename_limit = diff_rename_limit_default;
-       if (options->setup & DIFF_SETUP_USE_CACHE) {
-               if (!active_cache)
-                       /* read-cache does not die even when it fails
-                        * so it is safe for us to do this here.  Also
-                        * it does not smudge active_cache or active_nr
-                        * when it fails, so we do not have to worry about
-                        * cleaning it up ourselves either.
-                        */
-                       read_cache();
-       }
-       if (40 < options->abbrev)
-               options->abbrev = 40; /* full */
+       if (hexsz < options->abbrev)
+               options->abbrev = hexsz; /* full */
 
        /*
         * It does not make sense to show the first hit we happened
@@ -4216,68 +4629,8 @@ void diff_setup_done(struct diff_options *options)
 
        if (!options->use_color || external_diff())
                options->color_moved = 0;
-}
 
-static int opt_arg(const char *arg, int arg_short, const char *arg_long, int *val)
-{
-       char c, *eq;
-       int len;
-
-       if (*arg != '-')
-               return 0;
-       c = *++arg;
-       if (!c)
-               return 0;
-       if (c == arg_short) {
-               c = *++arg;
-               if (!c)
-                       return 1;
-               if (val && isdigit(c)) {
-                       char *end;
-                       int n = strtoul(arg, &end, 10);
-                       if (*end)
-                               return 0;
-                       *val = n;
-                       return 1;
-               }
-               return 0;
-       }
-       if (c != '-')
-               return 0;
-       arg++;
-       eq = strchrnul(arg, '=');
-       len = eq - arg;
-       if (!len || strncmp(arg, arg_long, len))
-               return 0;
-       if (*eq) {
-               int n;
-               char *end;
-               if (!isdigit(*++eq))
-                       return 0;
-               n = strtoul(eq, &end, 10);
-               if (*end)
-                       return 0;
-               *val = n;
-       }
-       return 1;
-}
-
-static int diff_scoreopt_parse(const char *opt);
-
-static inline int short_opt(char opt, const char **argv,
-                           const char **optarg)
-{
-       const char *arg = argv[0];
-       if (arg[0] != '-' || arg[1] != opt)
-               return 0;
-       if (arg[2] != '\0') {
-               *optarg = arg + 2;
-               return 1;
-       }
-       if (!argv[1])
-               die("Option '%c' requires a value", opt);
-       *optarg = argv[1];
-       return 2;
+       FREE_AND_NULL(options->parseopts);
 }
 
 int parse_long_opt(const char *opt, const char **argv,
@@ -4301,77 +4654,56 @@ int parse_long_opt(const char *opt, const char **argv,
        return 2;
 }
 
-static int stat_opt(struct diff_options *options, const char **av)
+static int diff_opt_stat(const struct option *opt, const char *value, int unset)
 {
-       const char *arg = av[0];
-       char *end;
+       struct diff_options *options = opt->value;
        int width = options->stat_width;
        int name_width = options->stat_name_width;
        int graph_width = options->stat_graph_width;
        int count = options->stat_count;
-       int argcount = 1;
+       char *end;
 
-       if (!skip_prefix(arg, "--stat", &arg))
-               die("BUG: stat option does not begin with --stat: %s", arg);
-       end = (char *)arg;
+       BUG_ON_OPT_NEG(unset);
 
-       switch (*arg) {
-       case '-':
-               if (skip_prefix(arg, "-width", &arg)) {
-                       if (*arg == '=')
-                               width = strtoul(arg + 1, &end, 10);
-                       else if (!*arg && !av[1])
-                               die_want_option("--stat-width");
-                       else if (!*arg) {
-                               width = strtoul(av[1], &end, 10);
-                               argcount = 2;
-                       }
-               } else if (skip_prefix(arg, "-name-width", &arg)) {
-                       if (*arg == '=')
-                               name_width = strtoul(arg + 1, &end, 10);
-                       else if (!*arg && !av[1])
-                               die_want_option("--stat-name-width");
-                       else if (!*arg) {
-                               name_width = strtoul(av[1], &end, 10);
-                               argcount = 2;
-                       }
-               } else if (skip_prefix(arg, "-graph-width", &arg)) {
-                       if (*arg == '=')
-                               graph_width = strtoul(arg + 1, &end, 10);
-                       else if (!*arg && !av[1])
-                               die_want_option("--stat-graph-width");
-                       else if (!*arg) {
-                               graph_width = strtoul(av[1], &end, 10);
-                               argcount = 2;
-                       }
-               } else if (skip_prefix(arg, "-count", &arg)) {
-                       if (*arg == '=')
-                               count = strtoul(arg + 1, &end, 10);
-                       else if (!*arg && !av[1])
-                               die_want_option("--stat-count");
-                       else if (!*arg) {
-                               count = strtoul(av[1], &end, 10);
-                               argcount = 2;
-                       }
+       if (!strcmp(opt->long_name, "stat")) {
+               if (value) {
+                       width = strtoul(value, &end, 10);
+                       if (*end == ',')
+                               name_width = strtoul(end+1, &end, 10);
+                       if (*end == ',')
+                               count = strtoul(end+1, &end, 10);
+                       if (*end)
+                               return error(_("invalid --stat value: %s"), value);
                }
-               break;
-       case '=':
-               width = strtoul(arg+1, &end, 10);
-               if (*end == ',')
-                       name_width = strtoul(end+1, &end, 10);
-               if (*end == ',')
-                       count = strtoul(end+1, &end, 10);
-       }
+       } else if (!strcmp(opt->long_name, "stat-width")) {
+               width = strtoul(value, &end, 10);
+               if (*end)
+                       return error(_("%s expects a numerical value"),
+                                    opt->long_name);
+       } else if (!strcmp(opt->long_name, "stat-name-width")) {
+               name_width = strtoul(value, &end, 10);
+               if (*end)
+                       return error(_("%s expects a numerical value"),
+                                    opt->long_name);
+       } else if (!strcmp(opt->long_name, "stat-graph-width")) {
+               graph_width = strtoul(value, &end, 10);
+               if (*end)
+                       return error(_("%s expects a numerical value"),
+                                    opt->long_name);
+       } else if (!strcmp(opt->long_name, "stat-count")) {
+               count = strtoul(value, &end, 10);
+               if (*end)
+                       return error(_("%s expects a numerical value"),
+                                    opt->long_name);
+       } else
+               BUG("%s should not get here", opt->long_name);
 
-       /* Important! This checks all the error cases! */
-       if (*end)
-               return 0;
        options->output_format |= DIFF_FORMAT_DIFFSTAT;
        options->stat_name_width = name_width;
        options->stat_graph_width = graph_width;
        options->stat_width = width;
        options->stat_count = count;
-       return argcount;
+       return 0;
 }
 
 static int parse_dirstat_opt(struct diff_options *options, const char *params)
@@ -4389,14 +4721,6 @@ static int parse_dirstat_opt(struct diff_options *options, const char *params)
        return 1;
 }
 
-static int parse_submodule_opt(struct diff_options *options, const char *value)
-{
-       if (parse_submodule_params(options, value))
-               die(_("Failed to parse --submodule option parameter: '%s'"),
-                       value);
-       return 1;
-}
-
 static const char diff_status_letters[] = {
        DIFF_STATUS_ADDED,
        DIFF_STATUS_COPIED,
@@ -4428,10 +4752,19 @@ static unsigned filter_bit_tst(char status, const struct diff_options *opt)
        return opt->filter & filter_bit[(int) status];
 }
 
-static int parse_diff_filter_opt(const char *optarg, struct diff_options *opt)
+unsigned diff_filter_bit(char status)
 {
+       prepare_filter_bits();
+       return filter_bit[(int) status];
+}
+
+static int diff_opt_diff_filter(const struct option *option,
+                               const char *optarg, int unset)
+{
+       struct diff_options *opt = option->value;
        int i, optch;
 
+       BUG_ON_OPT_NEG(unset);
        prepare_filter_bits();
 
        /*
@@ -4462,7 +4795,8 @@ static int parse_diff_filter_opt(const char *optarg, struct diff_options *opt)
 
                bit = (0 <= optch && optch <= 'Z') ? filter_bit[optch] : 0;
                if (!bit)
-                       return optarg[i];
+                       return error(_("unknown change class '%c' in --diff-filter=%s"),
+                                    optarg[i], optarg);
                if (negate)
                        opt->filter &= ~bit;
                else
@@ -4471,204 +4805,421 @@ static int parse_diff_filter_opt(const char *optarg, struct diff_options *opt)
        return 0;
 }
 
-static void enable_patch_output(int *fmt) {
+static void enable_patch_output(int *fmt)
+{
        *fmt &= ~DIFF_FORMAT_NO_OUTPUT;
        *fmt |= DIFF_FORMAT_PATCH;
 }
 
-static int parse_ws_error_highlight_opt(struct diff_options *opt, const char *arg)
+static int diff_opt_ws_error_highlight(const struct option *option,
+                                      const char *arg, int unset)
 {
+       struct diff_options *opt = option->value;
        int val = parse_ws_error_highlight(arg);
 
-       if (val < 0) {
-               error("unknown value after ws-error-highlight=%.*s",
-                     -1 - val, arg);
-               return 0;
-       }
+       BUG_ON_OPT_NEG(unset);
+       if (val < 0)
+               return error(_("unknown value after ws-error-highlight=%.*s"),
+                            -1 - val, arg);
        opt->ws_error_highlight = val;
-       return 1;
+       return 0;
 }
 
-int diff_opt_parse(struct diff_options *options,
-                  const char **av, int ac, const char *prefix)
+static int diff_opt_find_object(const struct option *option,
+                               const char *arg, int unset)
 {
-       const char *arg = av[0];
-       const char *optarg;
-       int argcount;
+       struct diff_options *opt = option->value;
+       struct object_id oid;
 
-       if (!prefix)
-               prefix = "";
+       BUG_ON_OPT_NEG(unset);
+       if (get_oid(arg, &oid))
+               return error(_("unable to resolve '%s'"), arg);
 
-       /* Output format options */
-       if (!strcmp(arg, "-p") || !strcmp(arg, "-u") || !strcmp(arg, "--patch")
-           || opt_arg(arg, 'U', "unified", &options->context))
-               enable_patch_output(&options->output_format);
-       else if (!strcmp(arg, "--raw"))
-               options->output_format |= DIFF_FORMAT_RAW;
-       else if (!strcmp(arg, "--patch-with-raw")) {
-               enable_patch_output(&options->output_format);
-               options->output_format |= DIFF_FORMAT_RAW;
-       } else if (!strcmp(arg, "--numstat"))
-               options->output_format |= DIFF_FORMAT_NUMSTAT;
-       else if (!strcmp(arg, "--shortstat"))
-               options->output_format |= DIFF_FORMAT_SHORTSTAT;
-       else if (skip_prefix(arg, "-X", &arg) ||
-                skip_to_optional_arg(arg, "--dirstat", &arg))
-               return parse_dirstat_opt(options, arg);
-       else if (!strcmp(arg, "--cumulative"))
-               return parse_dirstat_opt(options, "cumulative");
-       else if (skip_to_optional_arg(arg, "--dirstat-by-file", &arg)) {
-               parse_dirstat_opt(options, "files");
-               return parse_dirstat_opt(options, arg);
-       }
-       else if (!strcmp(arg, "--check"))
-               options->output_format |= DIFF_FORMAT_CHECKDIFF;
-       else if (!strcmp(arg, "--summary"))
-               options->output_format |= DIFF_FORMAT_SUMMARY;
-       else if (!strcmp(arg, "--patch-with-stat")) {
-               enable_patch_output(&options->output_format);
-               options->output_format |= DIFF_FORMAT_DIFFSTAT;
-       } else if (!strcmp(arg, "--name-only"))
-               options->output_format |= DIFF_FORMAT_NAME;
-       else if (!strcmp(arg, "--name-status"))
-               options->output_format |= DIFF_FORMAT_NAME_STATUS;
-       else if (!strcmp(arg, "-s") || !strcmp(arg, "--no-patch"))
-               options->output_format |= DIFF_FORMAT_NO_OUTPUT;
-       else if (starts_with(arg, "--stat"))
-               /* --stat, --stat-width, --stat-name-width, or --stat-count */
-               return stat_opt(options, av);
-
-       /* renames options */
-       else if (starts_with(arg, "-B") ||
-                skip_to_optional_arg(arg, "--break-rewrites", NULL)) {
-               if ((options->break_opt = diff_scoreopt_parse(arg)) == -1)
-                       return error("invalid argument to -B: %s", arg+2);
-       }
-       else if (starts_with(arg, "-M") ||
-                skip_to_optional_arg(arg, "--find-renames", NULL)) {
-               if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
-                       return error("invalid argument to -M: %s", arg+2);
-               options->detect_rename = DIFF_DETECT_RENAME;
-       }
-       else if (!strcmp(arg, "-D") || !strcmp(arg, "--irreversible-delete")) {
-               options->irreversible_delete = 1;
-       }
-       else if (starts_with(arg, "-C") ||
-                skip_to_optional_arg(arg, "--find-copies", NULL)) {
-               if (options->detect_rename == DIFF_DETECT_COPY)
-                       options->flags.find_copies_harder = 1;
-               if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
-                       return error("invalid argument to -C: %s", arg+2);
-               options->detect_rename = DIFF_DETECT_COPY;
+       if (!opt->objfind)
+               opt->objfind = xcalloc(1, sizeof(*opt->objfind));
+
+       opt->pickaxe_opts |= DIFF_PICKAXE_KIND_OBJFIND;
+       opt->flags.recursive = 1;
+       opt->flags.tree_in_recursive = 1;
+       oidset_insert(opt->objfind, &oid);
+       return 0;
+}
+
+static int diff_opt_anchored(const struct option *opt,
+                            const char *arg, int unset)
+{
+       struct diff_options *options = opt->value;
+
+       BUG_ON_OPT_NEG(unset);
+       options->xdl_opts = DIFF_WITH_ALG(options, PATIENCE_DIFF);
+       ALLOC_GROW(options->anchors, options->anchors_nr + 1,
+                  options->anchors_alloc);
+       options->anchors[options->anchors_nr++] = xstrdup(arg);
+       return 0;
+}
+
+static int diff_opt_binary(const struct option *opt,
+                          const char *arg, int unset)
+{
+       struct diff_options *options = opt->value;
+
+       BUG_ON_OPT_NEG(unset);
+       BUG_ON_OPT_ARG(arg);
+       enable_patch_output(&options->output_format);
+       options->flags.binary = 1;
+       return 0;
+}
+
+static int diff_opt_break_rewrites(const struct option *opt,
+                                  const char *arg, int unset)
+{
+       int *break_opt = opt->value;
+       int opt1, opt2;
+
+       BUG_ON_OPT_NEG(unset);
+       if (!arg)
+               arg = "";
+       opt1 = parse_rename_score(&arg);
+       if (*arg == 0)
+               opt2 = 0;
+       else if (*arg != '/')
+               return error(_("%s expects <n>/<m> form"), opt->long_name);
+       else {
+               arg++;
+               opt2 = parse_rename_score(&arg);
        }
-       else if (!strcmp(arg, "--no-renames"))
-               options->detect_rename = 0;
-       else if (!strcmp(arg, "--rename-empty"))
-               options->flags.rename_empty = 1;
-       else if (!strcmp(arg, "--no-rename-empty"))
-               options->flags.rename_empty = 0;
-       else if (skip_to_optional_arg_default(arg, "--relative", &arg, NULL)) {
-               options->flags.relative_name = 1;
-               if (arg)
-                       options->prefix = arg;
-       }
-
-       /* xdiff options */
-       else if (!strcmp(arg, "--minimal"))
-               DIFF_XDL_SET(options, NEED_MINIMAL);
-       else if (!strcmp(arg, "--no-minimal"))
-               DIFF_XDL_CLR(options, NEED_MINIMAL);
-       else if (!strcmp(arg, "-w") || !strcmp(arg, "--ignore-all-space"))
-               DIFF_XDL_SET(options, IGNORE_WHITESPACE);
-       else if (!strcmp(arg, "-b") || !strcmp(arg, "--ignore-space-change"))
-               DIFF_XDL_SET(options, IGNORE_WHITESPACE_CHANGE);
-       else if (!strcmp(arg, "--ignore-space-at-eol"))
-               DIFF_XDL_SET(options, IGNORE_WHITESPACE_AT_EOL);
-       else if (!strcmp(arg, "--ignore-cr-at-eol"))
-               DIFF_XDL_SET(options, IGNORE_CR_AT_EOL);
-       else if (!strcmp(arg, "--ignore-blank-lines"))
-               DIFF_XDL_SET(options, IGNORE_BLANK_LINES);
-       else if (!strcmp(arg, "--indent-heuristic"))
-               DIFF_XDL_SET(options, INDENT_HEURISTIC);
-       else if (!strcmp(arg, "--no-indent-heuristic"))
-               DIFF_XDL_CLR(options, INDENT_HEURISTIC);
-       else if (!strcmp(arg, "--patience")) {
-               int i;
-               options->xdl_opts = DIFF_WITH_ALG(options, PATIENCE_DIFF);
-               /*
-                * Both --patience and --anchored use PATIENCE_DIFF
-                * internally, so remove any anchors previously
-                * specified.
-                */
-               for (i = 0; i < options->anchors_nr; i++)
-                       free(options->anchors[i]);
-               options->anchors_nr = 0;
-       } else if (!strcmp(arg, "--histogram"))
-               options->xdl_opts = DIFF_WITH_ALG(options, HISTOGRAM_DIFF);
-       else if ((argcount = parse_long_opt("diff-algorithm", av, &optarg))) {
-               long value = parse_algorithm_value(optarg);
-               if (value < 0)
-                       return error("option diff-algorithm accepts \"myers\", "
-                                    "\"minimal\", \"patience\" and \"histogram\"");
-               /* clear out previous settings */
-               DIFF_XDL_CLR(options, NEED_MINIMAL);
-               options->xdl_opts &= ~XDF_DIFF_ALGORITHM_MASK;
-               options->xdl_opts |= value;
-               return argcount;
-       } else if (skip_prefix(arg, "--anchored=", &arg)) {
-               options->xdl_opts = DIFF_WITH_ALG(options, PATIENCE_DIFF);
-               ALLOC_GROW(options->anchors, options->anchors_nr + 1,
-                          options->anchors_alloc);
-               options->anchors[options->anchors_nr++] = xstrdup(arg);
-       }
-
-       /* flags options */
-       else if (!strcmp(arg, "--binary")) {
-               enable_patch_output(&options->output_format);
-               options->flags.binary = 1;
-       }
-       else if (!strcmp(arg, "--full-index"))
-               options->flags.full_index = 1;
-       else if (!strcmp(arg, "-a") || !strcmp(arg, "--text"))
-               options->flags.text = 1;
-       else if (!strcmp(arg, "-R"))
-               options->flags.reverse_diff = 1;
-       else if (!strcmp(arg, "--find-copies-harder"))
-               options->flags.find_copies_harder = 1;
-       else if (!strcmp(arg, "--follow"))
-               options->flags.follow_renames = 1;
-       else if (!strcmp(arg, "--no-follow")) {
-               options->flags.follow_renames = 0;
-               options->flags.default_follow_renames = 0;
-       } else if (skip_to_optional_arg_default(arg, "--color", &arg, "always")) {
-               int value = git_config_colorbool(NULL, arg);
-               if (value < 0)
-                       return error("option `color' expects \"always\", \"auto\", or \"never\"");
-               options->use_color = value;
-       }
-       else if (!strcmp(arg, "--no-color"))
-               options->use_color = 0;
-       else if (!strcmp(arg, "--color-moved")) {
+       if (*arg != 0)
+               return error(_("%s expects <n>/<m> form"), opt->long_name);
+       *break_opt = opt1 | (opt2 << 16);
+       return 0;
+}
+
+static int diff_opt_char(const struct option *opt,
+                        const char *arg, int unset)
+{
+       char *value = opt->value;
+
+       BUG_ON_OPT_NEG(unset);
+       if (arg[1])
+               return error(_("%s expects a character, got '%s'"),
+                            opt->long_name, arg);
+       *value = arg[0];
+       return 0;
+}
+
+static int diff_opt_color_moved(const struct option *opt,
+                               const char *arg, int unset)
+{
+       struct diff_options *options = opt->value;
+
+       if (unset) {
+               options->color_moved = COLOR_MOVED_NO;
+       } else if (!arg) {
                if (diff_color_moved_default)
                        options->color_moved = diff_color_moved_default;
                if (options->color_moved == COLOR_MOVED_NO)
                        options->color_moved = COLOR_MOVED_DEFAULT;
-       } else if (!strcmp(arg, "--no-color-moved"))
-               options->color_moved = COLOR_MOVED_NO;
-       else if (skip_prefix(arg, "--color-moved=", &arg)) {
+       } else {
                int cm = parse_color_moved(arg);
                if (cm < 0)
-                       die("bad --color-moved argument: %s", arg);
+                       return error(_("bad --color-moved argument: %s"), arg);
                options->color_moved = cm;
-       } else if (skip_to_optional_arg_default(arg, "--color-words", &options->word_regex, NULL)) {
-               options->use_color = 1;
-               options->word_diff = DIFF_WORDS_COLOR;
        }
-       else if (!strcmp(arg, "--word-diff")) {
-               if (options->word_diff == DIFF_WORDS_NONE)
-                       options->word_diff = DIFF_WORDS_PLAIN;
+       return 0;
+}
+
+static int diff_opt_color_moved_ws(const struct option *opt,
+                                  const char *arg, int unset)
+{
+       struct diff_options *options = opt->value;
+       unsigned cm;
+
+       if (unset) {
+               options->color_moved_ws_handling = 0;
+               return 0;
+       }
+
+       cm = parse_color_moved_ws(arg);
+       if (cm & COLOR_MOVED_WS_ERROR)
+               return error(_("invalid mode '%s' in --color-moved-ws"), arg);
+       options->color_moved_ws_handling = cm;
+       return 0;
+}
+
+static int diff_opt_color_words(const struct option *opt,
+                               const char *arg, int unset)
+{
+       struct diff_options *options = opt->value;
+
+       BUG_ON_OPT_NEG(unset);
+       options->use_color = 1;
+       options->word_diff = DIFF_WORDS_COLOR;
+       options->word_regex = arg;
+       return 0;
+}
+
+static int diff_opt_compact_summary(const struct option *opt,
+                                   const char *arg, int unset)
+{
+       struct diff_options *options = opt->value;
+
+       BUG_ON_OPT_ARG(arg);
+       if (unset) {
+               options->flags.stat_with_summary = 0;
+       } else {
+               options->flags.stat_with_summary = 1;
+               options->output_format |= DIFF_FORMAT_DIFFSTAT;
+       }
+       return 0;
+}
+
+static int diff_opt_diff_algorithm(const struct option *opt,
+                                  const char *arg, int unset)
+{
+       struct diff_options *options = opt->value;
+       long value = parse_algorithm_value(arg);
+
+       BUG_ON_OPT_NEG(unset);
+       if (value < 0)
+               return error(_("option diff-algorithm accepts \"myers\", "
+                              "\"minimal\", \"patience\" and \"histogram\""));
+
+       /* clear out previous settings */
+       DIFF_XDL_CLR(options, NEED_MINIMAL);
+       options->xdl_opts &= ~XDF_DIFF_ALGORITHM_MASK;
+       options->xdl_opts |= value;
+       return 0;
+}
+
+static int diff_opt_dirstat(const struct option *opt,
+                           const char *arg, int unset)
+{
+       struct diff_options *options = opt->value;
+
+       BUG_ON_OPT_NEG(unset);
+       if (!strcmp(opt->long_name, "cumulative")) {
+               if (arg)
+                       BUG("how come --cumulative take a value?");
+               arg = "cumulative";
+       } else if (!strcmp(opt->long_name, "dirstat-by-file"))
+               parse_dirstat_opt(options, "files");
+       parse_dirstat_opt(options, arg ? arg : "");
+       return 0;
+}
+
+static int diff_opt_find_copies(const struct option *opt,
+                               const char *arg, int unset)
+{
+       struct diff_options *options = opt->value;
+
+       BUG_ON_OPT_NEG(unset);
+       if (!arg)
+               arg = "";
+       options->rename_score = parse_rename_score(&arg);
+       if (*arg != 0)
+               return error(_("invalid argument to %s"), opt->long_name);
+
+       if (options->detect_rename == DIFF_DETECT_COPY)
+               options->flags.find_copies_harder = 1;
+       else
+               options->detect_rename = DIFF_DETECT_COPY;
+
+       return 0;
+}
+
+static int diff_opt_find_renames(const struct option *opt,
+                                const char *arg, int unset)
+{
+       struct diff_options *options = opt->value;
+
+       BUG_ON_OPT_NEG(unset);
+       if (!arg)
+               arg = "";
+       options->rename_score = parse_rename_score(&arg);
+       if (*arg != 0)
+               return error(_("invalid argument to %s"), opt->long_name);
+
+       options->detect_rename = DIFF_DETECT_RENAME;
+       return 0;
+}
+
+static int diff_opt_follow(const struct option *opt,
+                          const char *arg, int unset)
+{
+       struct diff_options *options = opt->value;
+
+       BUG_ON_OPT_ARG(arg);
+       if (unset) {
+               options->flags.follow_renames = 0;
+               options->flags.default_follow_renames = 0;
+       } else {
+               options->flags.follow_renames = 1;
+       }
+       return 0;
+}
+
+static int diff_opt_ignore_submodules(const struct option *opt,
+                                     const char *arg, int unset)
+{
+       struct diff_options *options = opt->value;
+
+       BUG_ON_OPT_NEG(unset);
+       if (!arg)
+               arg = "all";
+       options->flags.override_submodule_config = 1;
+       handle_ignore_submodules_arg(options, arg);
+       return 0;
+}
+
+static int diff_opt_line_prefix(const struct option *opt,
+                               const char *optarg, int unset)
+{
+       struct diff_options *options = opt->value;
+
+       BUG_ON_OPT_NEG(unset);
+       options->line_prefix = optarg;
+       options->line_prefix_length = strlen(options->line_prefix);
+       graph_setup_line_prefix(options);
+       return 0;
+}
+
+static int diff_opt_no_prefix(const struct option *opt,
+                             const char *optarg, int unset)
+{
+       struct diff_options *options = opt->value;
+
+       BUG_ON_OPT_NEG(unset);
+       BUG_ON_OPT_ARG(optarg);
+       options->a_prefix = "";
+       options->b_prefix = "";
+       return 0;
+}
+
+static enum parse_opt_result diff_opt_output(struct parse_opt_ctx_t *ctx,
+                                            const struct option *opt,
+                                            const char *arg, int unset)
+{
+       struct diff_options *options = opt->value;
+       char *path;
+
+       BUG_ON_OPT_NEG(unset);
+       path = prefix_filename(ctx->prefix, arg);
+       options->file = xfopen(path, "w");
+       options->close_file = 1;
+       if (options->use_color != GIT_COLOR_ALWAYS)
+               options->use_color = GIT_COLOR_NEVER;
+       free(path);
+       return 0;
+}
+
+static int diff_opt_patience(const struct option *opt,
+                            const char *arg, int unset)
+{
+       struct diff_options *options = opt->value;
+       int i;
+
+       BUG_ON_OPT_NEG(unset);
+       BUG_ON_OPT_ARG(arg);
+       options->xdl_opts = DIFF_WITH_ALG(options, PATIENCE_DIFF);
+       /*
+        * Both --patience and --anchored use PATIENCE_DIFF
+        * internally, so remove any anchors previously
+        * specified.
+        */
+       for (i = 0; i < options->anchors_nr; i++)
+               free(options->anchors[i]);
+       options->anchors_nr = 0;
+       return 0;
+}
+
+static int diff_opt_pickaxe_regex(const struct option *opt,
+                                 const char *arg, int unset)
+{
+       struct diff_options *options = opt->value;
+
+       BUG_ON_OPT_NEG(unset);
+       options->pickaxe = arg;
+       options->pickaxe_opts |= DIFF_PICKAXE_KIND_G;
+       return 0;
+}
+
+static int diff_opt_pickaxe_string(const struct option *opt,
+                                  const char *arg, int unset)
+{
+       struct diff_options *options = opt->value;
+
+       BUG_ON_OPT_NEG(unset);
+       options->pickaxe = arg;
+       options->pickaxe_opts |= DIFF_PICKAXE_KIND_S;
+       return 0;
+}
+
+static int diff_opt_relative(const struct option *opt,
+                            const char *arg, int unset)
+{
+       struct diff_options *options = opt->value;
+
+       BUG_ON_OPT_NEG(unset);
+       options->flags.relative_name = 1;
+       if (arg)
+               options->prefix = arg;
+       return 0;
+}
+
+static int diff_opt_submodule(const struct option *opt,
+                             const char *arg, int unset)
+{
+       struct diff_options *options = opt->value;
+
+       BUG_ON_OPT_NEG(unset);
+       if (!arg)
+               arg = "log";
+       if (parse_submodule_params(options, arg))
+               return error(_("failed to parse --submodule option parameter: '%s'"),
+                            arg);
+       return 0;
+}
+
+static int diff_opt_textconv(const struct option *opt,
+                            const char *arg, int unset)
+{
+       struct diff_options *options = opt->value;
+
+       BUG_ON_OPT_ARG(arg);
+       if (unset) {
+               options->flags.allow_textconv = 0;
+       } else {
+               options->flags.allow_textconv = 1;
+               options->flags.textconv_set_via_cmdline = 1;
+       }
+       return 0;
+}
+
+static int diff_opt_unified(const struct option *opt,
+                           const char *arg, int unset)
+{
+       struct diff_options *options = opt->value;
+       char *s;
+
+       BUG_ON_OPT_NEG(unset);
+
+       if (arg) {
+               options->context = strtol(arg, &s, 10);
+               if (*s)
+                       return error(_("%s expects a numerical value"), "--unified");
        }
-       else if (skip_prefix(arg, "--word-diff=", &arg)) {
+       enable_patch_output(&options->output_format);
+
+       return 0;
+}
+
+static int diff_opt_word_diff(const struct option *opt,
+                             const char *arg, int unset)
+{
+       struct diff_options *options = opt->value;
+
+       BUG_ON_OPT_NEG(unset);
+       if (arg) {
                if (!strcmp(arg, "plain"))
                        options->word_diff = DIFF_WORDS_PLAIN;
                else if (!strcmp(arg, "color")) {
@@ -4680,117 +5231,305 @@ int diff_opt_parse(struct diff_options *options,
                else if (!strcmp(arg, "none"))
                        options->word_diff = DIFF_WORDS_NONE;
                else
-                       die("bad --word-diff argument: %s", arg);
-       }
-       else if ((argcount = parse_long_opt("word-diff-regex", av, &optarg))) {
+                       return error(_("bad --word-diff argument: %s"), arg);
+       } else {
                if (options->word_diff == DIFF_WORDS_NONE)
                        options->word_diff = DIFF_WORDS_PLAIN;
-               options->word_regex = optarg;
-               return argcount;
        }
-       else if (!strcmp(arg, "--exit-code"))
-               options->flags.exit_with_status = 1;
-       else if (!strcmp(arg, "--quiet"))
-               options->flags.quick = 1;
-       else if (!strcmp(arg, "--ext-diff"))
-               options->flags.allow_external = 1;
-       else if (!strcmp(arg, "--no-ext-diff"))
-               options->flags.allow_external = 0;
-       else if (!strcmp(arg, "--textconv")) {
-               options->flags.allow_textconv = 1;
-               options->flags.textconv_set_via_cmdline = 1;
-       } else if (!strcmp(arg, "--no-textconv"))
-               options->flags.allow_textconv = 0;
-       else if (skip_to_optional_arg_default(arg, "--ignore-submodules", &arg, "all")) {
-               options->flags.override_submodule_config = 1;
-               handle_ignore_submodules_arg(options, arg);
-       } else if (skip_to_optional_arg_default(arg, "--submodule", &arg, "log"))
-               return parse_submodule_opt(options, arg);
-       else if (skip_prefix(arg, "--ws-error-highlight=", &arg))
-               return parse_ws_error_highlight_opt(options, arg);
-       else if (!strcmp(arg, "--ita-invisible-in-index"))
-               options->ita_invisible_in_index = 1;
-       else if (!strcmp(arg, "--ita-visible-in-index"))
-               options->ita_invisible_in_index = 0;
-
-       /* misc options */
-       else if (!strcmp(arg, "-z"))
-               options->line_termination = 0;
-       else if ((argcount = short_opt('l', av, &optarg))) {
-               options->rename_limit = strtoul(optarg, NULL, 10);
-               return argcount;
-       }
-       else if ((argcount = short_opt('S', av, &optarg))) {
-               options->pickaxe = optarg;
-               options->pickaxe_opts |= DIFF_PICKAXE_KIND_S;
-               return argcount;
-       } else if ((argcount = short_opt('G', av, &optarg))) {
-               options->pickaxe = optarg;
-               options->pickaxe_opts |= DIFF_PICKAXE_KIND_G;
-               return argcount;
-       }
-       else if (!strcmp(arg, "--pickaxe-all"))
-               options->pickaxe_opts |= DIFF_PICKAXE_ALL;
-       else if (!strcmp(arg, "--pickaxe-regex"))
-               options->pickaxe_opts |= DIFF_PICKAXE_REGEX;
-       else if ((argcount = short_opt('O', av, &optarg))) {
-               options->orderfile = prefix_filename(prefix, optarg);
-               return argcount;
-       }
-       else if ((argcount = parse_long_opt("diff-filter", av, &optarg))) {
-               int offending = parse_diff_filter_opt(optarg, options);
-               if (offending)
-                       die("unknown change class '%c' in --diff-filter=%s",
-                           offending, optarg);
-               return argcount;
-       }
-       else if (!strcmp(arg, "--no-abbrev"))
-               options->abbrev = 0;
-       else if (!strcmp(arg, "--abbrev"))
-               options->abbrev = DEFAULT_ABBREV;
-       else if (skip_prefix(arg, "--abbrev=", &arg)) {
-               options->abbrev = strtoul(arg, NULL, 10);
-               if (options->abbrev < MINIMUM_ABBREV)
-                       options->abbrev = MINIMUM_ABBREV;
-               else if (40 < options->abbrev)
-                       options->abbrev = 40;
-       }
-       else if ((argcount = parse_long_opt("src-prefix", av, &optarg))) {
-               options->a_prefix = optarg;
-               return argcount;
-       }
-       else if ((argcount = parse_long_opt("line-prefix", av, &optarg))) {
-               options->line_prefix = optarg;
-               options->line_prefix_length = strlen(options->line_prefix);
-               graph_setup_line_prefix(options);
-               return argcount;
-       }
-       else if ((argcount = parse_long_opt("dst-prefix", av, &optarg))) {
-               options->b_prefix = optarg;
-               return argcount;
-       }
-       else if (!strcmp(arg, "--no-prefix"))
-               options->a_prefix = options->b_prefix = "";
-       else if (opt_arg(arg, '\0', "inter-hunk-context",
-                        &options->interhunkcontext))
-               ;
-       else if (!strcmp(arg, "-W"))
-               options->flags.funccontext = 1;
-       else if (!strcmp(arg, "--function-context"))
-               options->flags.funccontext = 1;
-       else if (!strcmp(arg, "--no-function-context"))
-               options->flags.funccontext = 0;
-       else if ((argcount = parse_long_opt("output", av, &optarg))) {
-               char *path = prefix_filename(prefix, optarg);
-               options->file = xfopen(path, "w");
-               options->close_file = 1;
-               if (options->use_color != GIT_COLOR_ALWAYS)
-                       options->use_color = GIT_COLOR_NEVER;
-               free(path);
-               return argcount;
-       } else
-               return 0;
-       return 1;
+       return 0;
+}
+
+static int diff_opt_word_diff_regex(const struct option *opt,
+                                   const char *arg, int unset)
+{
+       struct diff_options *options = opt->value;
+
+       BUG_ON_OPT_NEG(unset);
+       if (options->word_diff == DIFF_WORDS_NONE)
+               options->word_diff = DIFF_WORDS_PLAIN;
+       options->word_regex = arg;
+       return 0;
+}
+
+static void prep_parse_options(struct diff_options *options)
+{
+       struct option parseopts[] = {
+               OPT_GROUP(N_("Diff output format options")),
+               OPT_BITOP('p', "patch", &options->output_format,
+                         N_("generate patch"),
+                         DIFF_FORMAT_PATCH, DIFF_FORMAT_NO_OUTPUT),
+               OPT_BIT_F('s', "no-patch", &options->output_format,
+                         N_("suppress diff output"),
+                         DIFF_FORMAT_NO_OUTPUT, PARSE_OPT_NONEG),
+               OPT_BITOP('u', NULL, &options->output_format,
+                         N_("generate patch"),
+                         DIFF_FORMAT_PATCH, DIFF_FORMAT_NO_OUTPUT),
+               OPT_CALLBACK_F('U', "unified", options, N_("<n>"),
+                              N_("generate diffs with <n> lines context"),
+                              PARSE_OPT_NONEG | PARSE_OPT_OPTARG, diff_opt_unified),
+               OPT_BOOL('W', "function-context", &options->flags.funccontext,
+                        N_("generate diffs with <n> lines context")),
+               OPT_BIT_F(0, "raw", &options->output_format,
+                         N_("generate the diff in raw format"),
+                         DIFF_FORMAT_RAW, PARSE_OPT_NONEG),
+               OPT_BITOP(0, "patch-with-raw", &options->output_format,
+                         N_("synonym for '-p --raw'"),
+                         DIFF_FORMAT_PATCH | DIFF_FORMAT_RAW,
+                         DIFF_FORMAT_NO_OUTPUT),
+               OPT_BITOP(0, "patch-with-stat", &options->output_format,
+                         N_("synonym for '-p --stat'"),
+                         DIFF_FORMAT_PATCH | DIFF_FORMAT_DIFFSTAT,
+                         DIFF_FORMAT_NO_OUTPUT),
+               OPT_BIT_F(0, "numstat", &options->output_format,
+                         N_("machine friendly --stat"),
+                         DIFF_FORMAT_NUMSTAT, PARSE_OPT_NONEG),
+               OPT_BIT_F(0, "shortstat", &options->output_format,
+                         N_("output only the last line of --stat"),
+                         DIFF_FORMAT_SHORTSTAT, PARSE_OPT_NONEG),
+               OPT_CALLBACK_F('X', "dirstat", options, N_("<param1,param2>..."),
+                              N_("output the distribution of relative amount of changes for each sub-directory"),
+                              PARSE_OPT_NONEG | PARSE_OPT_OPTARG,
+                              diff_opt_dirstat),
+               OPT_CALLBACK_F(0, "cumulative", options, NULL,
+                              N_("synonym for --dirstat=cumulative"),
+                              PARSE_OPT_NONEG | PARSE_OPT_NOARG,
+                              diff_opt_dirstat),
+               OPT_CALLBACK_F(0, "dirstat-by-file", options, N_("<param1,param2>..."),
+                              N_("synonym for --dirstat=files,param1,param2..."),
+                              PARSE_OPT_NONEG | PARSE_OPT_OPTARG,
+                              diff_opt_dirstat),
+               OPT_BIT_F(0, "check", &options->output_format,
+                         N_("warn if changes introduce conflict markers or whitespace errors"),
+                         DIFF_FORMAT_CHECKDIFF, PARSE_OPT_NONEG),
+               OPT_BIT_F(0, "summary", &options->output_format,
+                         N_("condensed summary such as creations, renames and mode changes"),
+                         DIFF_FORMAT_SUMMARY, PARSE_OPT_NONEG),
+               OPT_BIT_F(0, "name-only", &options->output_format,
+                         N_("show only names of changed files"),
+                         DIFF_FORMAT_NAME, PARSE_OPT_NONEG),
+               OPT_BIT_F(0, "name-status", &options->output_format,
+                         N_("show only names and status of changed files"),
+                         DIFF_FORMAT_NAME_STATUS, PARSE_OPT_NONEG),
+               OPT_CALLBACK_F(0, "stat", options, N_("<width>[,<name-width>[,<count>]]"),
+                              N_("generate diffstat"),
+                              PARSE_OPT_NONEG | PARSE_OPT_OPTARG, diff_opt_stat),
+               OPT_CALLBACK_F(0, "stat-width", options, N_("<width>"),
+                              N_("generate diffstat with a given width"),
+                              PARSE_OPT_NONEG, diff_opt_stat),
+               OPT_CALLBACK_F(0, "stat-name-width", options, N_("<width>"),
+                              N_("generate diffstat with a given name width"),
+                              PARSE_OPT_NONEG, diff_opt_stat),
+               OPT_CALLBACK_F(0, "stat-graph-width", options, N_("<width>"),
+                              N_("generate diffstat with a given graph width"),
+                              PARSE_OPT_NONEG, diff_opt_stat),
+               OPT_CALLBACK_F(0, "stat-count", options, N_("<count>"),
+                              N_("generate diffstat with limited lines"),
+                              PARSE_OPT_NONEG, diff_opt_stat),
+               OPT_CALLBACK_F(0, "compact-summary", options, NULL,
+                              N_("generate compact summary in diffstat"),
+                              PARSE_OPT_NOARG, diff_opt_compact_summary),
+               OPT_CALLBACK_F(0, "binary", options, NULL,
+                              N_("output a binary diff that can be applied"),
+                              PARSE_OPT_NONEG | PARSE_OPT_NOARG, diff_opt_binary),
+               OPT_BOOL(0, "full-index", &options->flags.full_index,
+                        N_("show full pre- and post-image object names on the \"index\" lines")),
+               OPT_COLOR_FLAG(0, "color", &options->use_color,
+                              N_("show colored diff")),
+               OPT_CALLBACK_F(0, "ws-error-highlight", options, N_("<kind>"),
+                              N_("highlight whitespace errors in the 'context', 'old' or 'new' lines in the diff"),
+                              PARSE_OPT_NONEG, diff_opt_ws_error_highlight),
+               OPT_SET_INT('z', NULL, &options->line_termination,
+                           N_("do not munge pathnames and use NULs as output field terminators in --raw or --numstat"),
+                           0),
+               OPT__ABBREV(&options->abbrev),
+               OPT_STRING_F(0, "src-prefix", &options->a_prefix, N_("<prefix>"),
+                            N_("show the given source prefix instead of \"a/\""),
+                            PARSE_OPT_NONEG),
+               OPT_STRING_F(0, "dst-prefix", &options->b_prefix, N_("<prefix>"),
+                            N_("show the given destination prefix instead of \"b/\""),
+                            PARSE_OPT_NONEG),
+               OPT_CALLBACK_F(0, "line-prefix", options, N_("<prefix>"),
+                              N_("prepend an additional prefix to every line of output"),
+                              PARSE_OPT_NONEG, diff_opt_line_prefix),
+               OPT_CALLBACK_F(0, "no-prefix", options, NULL,
+                              N_("do not show any source or destination prefix"),
+                              PARSE_OPT_NONEG | PARSE_OPT_NOARG, diff_opt_no_prefix),
+               OPT_INTEGER_F(0, "inter-hunk-context", &options->interhunkcontext,
+                             N_("show context between diff hunks up to the specified number of lines"),
+                             PARSE_OPT_NONEG),
+               OPT_CALLBACK_F(0, "output-indicator-new",
+                              &options->output_indicators[OUTPUT_INDICATOR_NEW],
+                              N_("<char>"),
+                              N_("specify the character to indicate a new line instead of '+'"),
+                              PARSE_OPT_NONEG, diff_opt_char),
+               OPT_CALLBACK_F(0, "output-indicator-old",
+                              &options->output_indicators[OUTPUT_INDICATOR_OLD],
+                              N_("<char>"),
+                              N_("specify the character to indicate an old line instead of '-'"),
+                              PARSE_OPT_NONEG, diff_opt_char),
+               OPT_CALLBACK_F(0, "output-indicator-context",
+                              &options->output_indicators[OUTPUT_INDICATOR_CONTEXT],
+                              N_("<char>"),
+                              N_("specify the character to indicate a context instead of ' '"),
+                              PARSE_OPT_NONEG, diff_opt_char),
+
+               OPT_GROUP(N_("Diff rename options")),
+               OPT_CALLBACK_F('B', "break-rewrites", &options->break_opt, N_("<n>[/<m>]"),
+                              N_("break complete rewrite changes into pairs of delete and create"),
+                              PARSE_OPT_NONEG | PARSE_OPT_OPTARG,
+                              diff_opt_break_rewrites),
+               OPT_CALLBACK_F('M', "find-renames", options, N_("<n>"),
+                              N_("detect renames"),
+                              PARSE_OPT_NONEG | PARSE_OPT_OPTARG,
+                              diff_opt_find_renames),
+               OPT_SET_INT_F('D', "irreversible-delete", &options->irreversible_delete,
+                             N_("omit the preimage for deletes"),
+                             1, PARSE_OPT_NONEG),
+               OPT_CALLBACK_F('C', "find-copies", options, N_("<n>"),
+                              N_("detect copies"),
+                              PARSE_OPT_NONEG | PARSE_OPT_OPTARG,
+                              diff_opt_find_copies),
+               OPT_BOOL(0, "find-copies-harder", &options->flags.find_copies_harder,
+                        N_("use unmodified files as source to find copies")),
+               OPT_SET_INT_F(0, "no-renames", &options->detect_rename,
+                             N_("disable rename detection"),
+                             0, PARSE_OPT_NONEG),
+               OPT_BOOL(0, "rename-empty", &options->flags.rename_empty,
+                        N_("use empty blobs as rename source")),
+               OPT_CALLBACK_F(0, "follow", options, NULL,
+                              N_("continue listing the history of a file beyond renames"),
+                              PARSE_OPT_NOARG, diff_opt_follow),
+               OPT_INTEGER('l', NULL, &options->rename_limit,
+                           N_("prevent rename/copy detection if the number of rename/copy targets exceeds given limit")),
+
+               OPT_GROUP(N_("Diff algorithm options")),
+               OPT_BIT(0, "minimal", &options->xdl_opts,
+                       N_("produce the smallest possible diff"),
+                       XDF_NEED_MINIMAL),
+               OPT_BIT_F('w', "ignore-all-space", &options->xdl_opts,
+                         N_("ignore whitespace when comparing lines"),
+                         XDF_IGNORE_WHITESPACE, PARSE_OPT_NONEG),
+               OPT_BIT_F('b', "ignore-space-change", &options->xdl_opts,
+                         N_("ignore changes in amount of whitespace"),
+                         XDF_IGNORE_WHITESPACE_CHANGE, PARSE_OPT_NONEG),
+               OPT_BIT_F(0, "ignore-space-at-eol", &options->xdl_opts,
+                         N_("ignore changes in whitespace at EOL"),
+                         XDF_IGNORE_WHITESPACE_AT_EOL, PARSE_OPT_NONEG),
+               OPT_BIT_F(0, "ignore-cr-at-eol", &options->xdl_opts,
+                         N_("ignore carrier-return at the end of line"),
+                         XDF_IGNORE_CR_AT_EOL, PARSE_OPT_NONEG),
+               OPT_BIT_F(0, "ignore-blank-lines", &options->xdl_opts,
+                         N_("ignore changes whose lines are all blank"),
+                         XDF_IGNORE_BLANK_LINES, PARSE_OPT_NONEG),
+               OPT_BIT(0, "indent-heuristic", &options->xdl_opts,
+                       N_("heuristic to shift diff hunk boundaries for easy reading"),
+                       XDF_INDENT_HEURISTIC),
+               OPT_CALLBACK_F(0, "patience", options, NULL,
+                              N_("generate diff using the \"patience diff\" algorithm"),
+                              PARSE_OPT_NONEG | PARSE_OPT_NOARG,
+                              diff_opt_patience),
+               OPT_BITOP(0, "histogram", &options->xdl_opts,
+                         N_("generate diff using the \"histogram diff\" algorithm"),
+                         XDF_HISTOGRAM_DIFF, XDF_DIFF_ALGORITHM_MASK),
+               OPT_CALLBACK_F(0, "diff-algorithm", options, N_("<algorithm>"),
+                              N_("choose a diff algorithm"),
+                              PARSE_OPT_NONEG, diff_opt_diff_algorithm),
+               OPT_CALLBACK_F(0, "anchored", options, N_("<text>"),
+                              N_("generate diff using the \"anchored diff\" algorithm"),
+                              PARSE_OPT_NONEG, diff_opt_anchored),
+               OPT_CALLBACK_F(0, "word-diff", options, N_("<mode>"),
+                              N_("show word diff, using <mode> to delimit changed words"),
+                              PARSE_OPT_NONEG | PARSE_OPT_OPTARG, diff_opt_word_diff),
+               OPT_CALLBACK_F(0, "word-diff-regex", options, N_("<regex>"),
+                              N_("use <regex> to decide what a word is"),
+                              PARSE_OPT_NONEG, diff_opt_word_diff_regex),
+               OPT_CALLBACK_F(0, "color-words", options, N_("<regex>"),
+                              N_("equivalent to --word-diff=color --word-diff-regex=<regex>"),
+                              PARSE_OPT_NONEG | PARSE_OPT_OPTARG, diff_opt_color_words),
+               OPT_CALLBACK_F(0, "color-moved", options, N_("<mode>"),
+                              N_("moved lines of code are colored differently"),
+                              PARSE_OPT_OPTARG, diff_opt_color_moved),
+               OPT_CALLBACK_F(0, "color-moved-ws", options, N_("<mode>"),
+                              N_("how white spaces are ignored in --color-moved"),
+                              0, diff_opt_color_moved_ws),
+
+               OPT_GROUP(N_("Other diff options")),
+               OPT_CALLBACK_F(0, "relative", options, N_("<prefix>"),
+                              N_("when run from subdir, exclude changes outside and show relative paths"),
+                              PARSE_OPT_NONEG | PARSE_OPT_OPTARG,
+                              diff_opt_relative),
+               OPT_BOOL('a', "text", &options->flags.text,
+                        N_("treat all files as text")),
+               OPT_BOOL('R', NULL, &options->flags.reverse_diff,
+                        N_("swap two inputs, reverse the diff")),
+               OPT_BOOL(0, "exit-code", &options->flags.exit_with_status,
+                        N_("exit with 1 if there were differences, 0 otherwise")),
+               OPT_BOOL(0, "quiet", &options->flags.quick,
+                        N_("disable all output of the program")),
+               OPT_BOOL(0, "ext-diff", &options->flags.allow_external,
+                        N_("allow an external diff helper to be executed")),
+               OPT_CALLBACK_F(0, "textconv", options, NULL,
+                              N_("run external text conversion filters when comparing binary files"),
+                              PARSE_OPT_NOARG, diff_opt_textconv),
+               OPT_CALLBACK_F(0, "ignore-submodules", options, N_("<when>"),
+                              N_("ignore changes to submodules in the diff generation"),
+                              PARSE_OPT_NONEG | PARSE_OPT_OPTARG,
+                              diff_opt_ignore_submodules),
+               OPT_CALLBACK_F(0, "submodule", options, N_("<format>"),
+                              N_("specify how differences in submodules are shown"),
+                              PARSE_OPT_NONEG | PARSE_OPT_OPTARG,
+                              diff_opt_submodule),
+               OPT_SET_INT_F(0, "ita-invisible-in-index", &options->ita_invisible_in_index,
+                             N_("hide 'git add -N' entries from the index"),
+                             1, PARSE_OPT_NONEG),
+               OPT_SET_INT_F(0, "ita-visible-in-index", &options->ita_invisible_in_index,
+                             N_("treat 'git add -N' entries as real in the index"),
+                             0, PARSE_OPT_NONEG),
+               OPT_CALLBACK_F('S', NULL, options, N_("<string>"),
+                              N_("look for differences that change the number of occurrences of the specified string"),
+                              0, diff_opt_pickaxe_string),
+               OPT_CALLBACK_F('G', NULL, options, N_("<regex>"),
+                              N_("look for differences that change the number of occurrences of the specified regex"),
+                              0, diff_opt_pickaxe_regex),
+               OPT_BIT_F(0, "pickaxe-all", &options->pickaxe_opts,
+                         N_("show all changes in the changeset with -S or -G"),
+                         DIFF_PICKAXE_ALL, PARSE_OPT_NONEG),
+               OPT_BIT_F(0, "pickaxe-regex", &options->pickaxe_opts,
+                         N_("treat <string> in -S as extended POSIX regular expression"),
+                         DIFF_PICKAXE_REGEX, PARSE_OPT_NONEG),
+               OPT_FILENAME('O', NULL, &options->orderfile,
+                            N_("control the order in which files appear in the output")),
+               OPT_CALLBACK_F(0, "find-object", options, N_("<object-id>"),
+                              N_("look for differences that change the number of occurrences of the specified object"),
+                              PARSE_OPT_NONEG, diff_opt_find_object),
+               OPT_CALLBACK_F(0, "diff-filter", options, N_("[(A|C|D|M|R|T|U|X|B)...[*]]"),
+                              N_("select files by diff type"),
+                              PARSE_OPT_NONEG, diff_opt_diff_filter),
+               { OPTION_CALLBACK, 0, "output", options, N_("<file>"),
+                 N_("Output to a specific file"),
+                 PARSE_OPT_NONEG, NULL, 0, diff_opt_output },
+
+               OPT_END()
+       };
+
+       ALLOC_ARRAY(options->parseopts, ARRAY_SIZE(parseopts));
+       memcpy(options->parseopts, parseopts, sizeof(parseopts));
+}
+
+int diff_opt_parse(struct diff_options *options,
+                  const char **av, int ac, const char *prefix)
+{
+       if (!prefix)
+               prefix = "";
+
+       ac = parse_options(ac, av, prefix, options->parseopts, NULL,
+                          PARSE_OPT_KEEP_DASHDASH |
+                          PARSE_OPT_KEEP_UNKNOWN |
+                          PARSE_OPT_NO_INTERNAL_HELP |
+                          PARSE_OPT_ONE_SHOT |
+                          PARSE_OPT_STOP_AT_NON_OPTION);
+
+       return ac;
 }
 
 int parse_rename_score(const char **cp_p)
@@ -4829,47 +5568,6 @@ int parse_rename_score(const char **cp_p)
        return (int)((num >= scale) ? MAX_SCORE : (MAX_SCORE * num / scale));
 }
 
-static int diff_scoreopt_parse(const char *opt)
-{
-       int opt1, opt2, cmd;
-
-       if (*opt++ != '-')
-               return -1;
-       cmd = *opt++;
-       if (cmd == '-') {
-               /* convert the long-form arguments into short-form versions */
-               if (skip_prefix(opt, "break-rewrites", &opt)) {
-                       if (*opt == 0 || *opt++ == '=')
-                               cmd = 'B';
-               } else if (skip_prefix(opt, "find-copies", &opt)) {
-                       if (*opt == 0 || *opt++ == '=')
-                               cmd = 'C';
-               } else if (skip_prefix(opt, "find-renames", &opt)) {
-                       if (*opt == 0 || *opt++ == '=')
-                               cmd = 'M';
-               }
-       }
-       if (cmd != 'M' && cmd != 'C' && cmd != 'B')
-               return -1; /* that is not a -M, -C, or -B option */
-
-       opt1 = parse_rename_score(&opt);
-       if (cmd != 'B')
-               opt2 = 0;
-       else {
-               if (*opt == 0)
-                       opt2 = 0;
-               else if (*opt != '/')
-                       return -1; /* we expect -B80/99 or -B80 */
-               else {
-                       opt++;
-                       opt2 = parse_rename_score(&opt);
-               }
-       }
-       if (*opt != 0)
-               return -1;
-       return opt1 | (opt2 << 16);
-}
-
 struct diff_queue_struct diff_queued_diff;
 
 void diff_q(struct diff_queue_struct *queue, struct diff_filepair *dp)
@@ -4903,7 +5601,7 @@ const char *diff_aligned_abbrev(const struct object_id *oid, int len)
        const char *abbrev;
 
        /* Do we want all 40 hex characters? */
-       if (len == GIT_SHA1_HEXSZ)
+       if (len == the_hash_algo->hexsz)
                return oid_to_hex(oid);
 
        /* An abbreviated value is fine, possibly followed by an ellipsis. */
@@ -4933,7 +5631,7 @@ const char *diff_aligned_abbrev(const struct object_id *oid, int len)
         * the automatic sizing is supposed to give abblen that ensures
         * uniqueness across all objects (statistically speaking).
         */
-       if (abblen < GIT_SHA1_HEXSZ - 3) {
+       if (abblen < the_hash_algo->hexsz - 3) {
                static char hex[GIT_MAX_HEXSZ + 1];
                if (len < abblen && abblen <= len + 2)
                        xsnprintf(hex, sizeof(hex), "%s%.*s", abbrev, len+3-abblen, "..");
@@ -5005,7 +5703,7 @@ int diff_unmodified_pair(struct diff_filepair *p)
         * dealing with a change.
         */
        if (one->oid_valid && two->oid_valid &&
-           !oidcmp(&one->oid, &two->oid) &&
+           oideq(&one->oid, &two->oid) &&
            !one->dirty_submodule && !two->dirty_submodule)
                return 1; /* no change */
        if (!one->oid_valid && !two->oid_valid)
@@ -5139,7 +5837,7 @@ static void diff_resolve_rename_copy(void)
                        else
                                p->status = DIFF_STATUS_RENAMED;
                }
-               else if (oidcmp(&p->one->oid, &p->two->oid) ||
+               else if (!oideq(&p->one->oid, &p->two->oid) ||
                         p->one->mode != p->two->mode ||
                         p->one->dirty_submodule ||
                         p->two->dirty_submodule ||
@@ -5224,10 +5922,12 @@ static void show_rename_copy(struct diff_options *opt, const char *renamecopy,
                struct diff_filepair *p)
 {
        struct strbuf sb = STRBUF_INIT;
-       char *names = pprint_rename(p->one->path, p->two->path);
+       struct strbuf names = STRBUF_INIT;
+
+       pprint_rename(&names, p->one->path, p->two->path);
        strbuf_addf(&sb, " %s %s (%d%%)\n",
-                       renamecopy, names, similarity_index(p));
-       free(names);
+                   renamecopy, names.buf, similarity_index(p));
+       strbuf_release(&names);
        emit_diff_symbol(opt, DIFF_SYMBOL_SUMMARY,
                                 sb.buf, sb.len, 0);
        show_mode_change(opt, p, 0);
@@ -5265,7 +5965,7 @@ static void diff_summary(struct diff_options *opt, struct diff_filepair *p)
 }
 
 struct patch_id_t {
-       git_SHA_CTX *ctx;
+       git_hash_ctx *ctx;
        int patchlen;
 };
 
@@ -5282,45 +5982,58 @@ static int remove_space(char *line, int len)
        return dst - line;
 }
 
+void flush_one_hunk(struct object_id *result, git_hash_ctx *ctx)
+{
+       unsigned char hash[GIT_MAX_RAWSZ];
+       unsigned short carry = 0;
+       int i;
+
+       the_hash_algo->final_fn(hash, ctx);
+       the_hash_algo->init_fn(ctx);
+       /* 20-byte sum, with carry */
+       for (i = 0; i < the_hash_algo->rawsz; ++i) {
+               carry += result->hash[i] + hash[i];
+               result->hash[i] = carry;
+               carry >>= 8;
+       }
+}
+
 static void patch_id_consume(void *priv, char *line, unsigned long len)
 {
        struct patch_id_t *data = priv;
        int new_len;
 
-       /* Ignore line numbers when computing the SHA1 of the patch */
-       if (starts_with(line, "@@ -"))
-               return;
-
        new_len = remove_space(line, len);
 
-       git_SHA1_Update(data->ctx, line, new_len);
+       the_hash_algo->update_fn(data->ctx, line, new_len);
        data->patchlen += new_len;
 }
 
-static void patch_id_add_string(git_SHA_CTX *ctx, const char *str)
+static void patch_id_add_string(git_hash_ctx *ctx, const char *str)
 {
-       git_SHA1_Update(ctx, str, strlen(str));
+       the_hash_algo->update_fn(ctx, str, strlen(str));
 }
 
-static void patch_id_add_mode(git_SHA_CTX *ctx, unsigned mode)
+static void patch_id_add_mode(git_hash_ctx *ctx, unsigned mode)
 {
        /* large enough for 2^32 in octal */
        char buf[12];
        int len = xsnprintf(buf, sizeof(buf), "%06o", mode);
-       git_SHA1_Update(ctx, buf, len);
+       the_hash_algo->update_fn(ctx, buf, len);
 }
 
-/* returns 0 upon success, and writes result into sha1 */
-static int diff_get_patch_id(struct diff_options *options, struct object_id *oid, int diff_header_only)
+/* returns 0 upon success, and writes result into oid */
+static int diff_get_patch_id(struct diff_options *options, struct object_id *oid, int diff_header_only, int stable)
 {
        struct diff_queue_struct *q = &diff_queued_diff;
        int i;
-       git_SHA_CTX ctx;
+       git_hash_ctx ctx;
        struct patch_id_t data;
 
-       git_SHA1_Init(&ctx);
+       the_hash_algo->init_fn(&ctx);
        memset(&data, 0, sizeof(struct patch_id_t));
        data.ctx = &ctx;
+       oidclr(oid);
 
        for (i = 0; i < q->nr; i++) {
                xpparam_t xpp;
@@ -5343,70 +6056,75 @@ static int diff_get_patch_id(struct diff_options *options, struct object_id *oid
                if (DIFF_PAIR_UNMERGED(p))
                        continue;
 
-               diff_fill_oid_info(p->one);
-               diff_fill_oid_info(p->two);
+               diff_fill_oid_info(p->one, options->repo->index);
+               diff_fill_oid_info(p->two, options->repo->index);
 
                len1 = remove_space(p->one->path, strlen(p->one->path));
                len2 = remove_space(p->two->path, strlen(p->two->path));
                patch_id_add_string(&ctx, "diff--git");
                patch_id_add_string(&ctx, "a/");
-               git_SHA1_Update(&ctx, p->one->path, len1);
+               the_hash_algo->update_fn(&ctx, p->one->path, len1);
                patch_id_add_string(&ctx, "b/");
-               git_SHA1_Update(&ctx, p->two->path, len2);
+               the_hash_algo->update_fn(&ctx, p->two->path, len2);
 
                if (p->one->mode == 0) {
                        patch_id_add_string(&ctx, "newfilemode");
                        patch_id_add_mode(&ctx, p->two->mode);
                        patch_id_add_string(&ctx, "---/dev/null");
                        patch_id_add_string(&ctx, "+++b/");
-                       git_SHA1_Update(&ctx, p->two->path, len2);
+                       the_hash_algo->update_fn(&ctx, p->two->path, len2);
                } else if (p->two->mode == 0) {
                        patch_id_add_string(&ctx, "deletedfilemode");
                        patch_id_add_mode(&ctx, p->one->mode);
                        patch_id_add_string(&ctx, "---a/");
-                       git_SHA1_Update(&ctx, p->one->path, len1);
+                       the_hash_algo->update_fn(&ctx, p->one->path, len1);
                        patch_id_add_string(&ctx, "+++/dev/null");
                } else {
                        patch_id_add_string(&ctx, "---a/");
-                       git_SHA1_Update(&ctx, p->one->path, len1);
+                       the_hash_algo->update_fn(&ctx, p->one->path, len1);
                        patch_id_add_string(&ctx, "+++b/");
-                       git_SHA1_Update(&ctx, p->two->path, len2);
+                       the_hash_algo->update_fn(&ctx, p->two->path, len2);
                }
 
                if (diff_header_only)
                        continue;
 
-               if (fill_mmfile(&mf1, p->one) < 0 ||
-                   fill_mmfile(&mf2, p->two) < 0)
+               if (fill_mmfile(options->repo, &mf1, p->one) < 0 ||
+                   fill_mmfile(options->repo, &mf2, p->two) < 0)
                        return error("unable to read files to diff");
 
-               if (diff_filespec_is_binary(p->one) ||
-                   diff_filespec_is_binary(p->two)) {
-                       git_SHA1_Update(&ctx, oid_to_hex(&p->one->oid),
-                                       GIT_SHA1_HEXSZ);
-                       git_SHA1_Update(&ctx, oid_to_hex(&p->two->oid),
-                                       GIT_SHA1_HEXSZ);
+               if (diff_filespec_is_binary(options->repo, p->one) ||
+                   diff_filespec_is_binary(options->repo, p->two)) {
+                       the_hash_algo->update_fn(&ctx, oid_to_hex(&p->one->oid),
+                                       the_hash_algo->hexsz);
+                       the_hash_algo->update_fn(&ctx, oid_to_hex(&p->two->oid),
+                                       the_hash_algo->hexsz);
                        continue;
                }
 
                xpp.flags = 0;
                xecfg.ctxlen = 3;
                xecfg.flags = 0;
-               if (xdi_diff_outf(&mf1, &mf2, patch_id_consume, &data,
-                                 &xpp, &xecfg))
+               if (xdi_diff_outf(&mf1, &mf2, discard_hunk_line,
+                                 patch_id_consume, &data, &xpp, &xecfg))
                        return error("unable to generate patch-id diff for %s",
                                     p->one->path);
+
+               if (stable)
+                       flush_one_hunk(oid, &ctx);
        }
 
-       git_SHA1_Final(oid->hash, &ctx);
+       if (!stable)
+               the_hash_algo->final_fn(oid->hash, &ctx);
+
        return 0;
 }
 
-int diff_flush_patch_id(struct diff_options *options, struct object_id *oid, int diff_header_only)
+int diff_flush_patch_id(struct diff_options *options, struct object_id *oid, int diff_header_only, int stable)
 {
        struct diff_queue_struct *q = &diff_queued_diff;
        int i;
-       int result = diff_get_patch_id(options, oid, diff_header_only);
+       int result = diff_get_patch_id(options, oid, diff_header_only, stable);
 
        for (i = 0; i < q->nr; i++)
                diff_free_filepair(q->queue[i]);
@@ -5472,7 +6190,7 @@ static void diff_flush_patch_all_file_pairs(struct diff_options *o)
        struct diff_queue_struct *q = &diff_queued_diff;
 
        if (WSEH_NEW & WS_RULE_MASK)
-               die("BUG: WS rules bit mask overlaps with diff symbol flags");
+               BUG("WS rules bit mask overlaps with diff symbol flags");
 
        if (o->color_moved)
                o->emitted_symbols = &esm;
@@ -5487,18 +6205,22 @@ static void diff_flush_patch_all_file_pairs(struct diff_options *o)
                if (o->color_moved) {
                        struct hashmap add_lines, del_lines;
 
-                       hashmap_init(&del_lines,
-                                    (hashmap_cmp_fn)moved_entry_cmp, o, 0);
-                       hashmap_init(&add_lines,
-                                    (hashmap_cmp_fn)moved_entry_cmp, o, 0);
+                       if (o->color_moved_ws_handling &
+                           COLOR_MOVED_WS_ALLOW_INDENTATION_CHANGE)
+                               o->color_moved_ws_handling |= XDF_IGNORE_WHITESPACE;
+
+                       hashmap_init(&del_lines, moved_entry_cmp, o, 0);
+                       hashmap_init(&add_lines, moved_entry_cmp, o, 0);
 
                        add_lines_to_move_detection(o, &add_lines, &del_lines);
                        mark_color_as_moved(o, &add_lines, &del_lines);
                        if (o->color_moved == COLOR_MOVED_ZEBRA_DIM)
                                dim_moved_lines(o);
 
-                       hashmap_free(&add_lines, 0);
-                       hashmap_free(&del_lines, 0);
+                       hashmap_free_entries(&add_lines, struct moved_entry,
+                                               ent);
+                       hashmap_free_entries(&del_lines, struct moved_entry,
+                                               ent);
                }
 
                for (i = 0; i < esm.nr; i++)
@@ -5506,8 +6228,10 @@ static void diff_flush_patch_all_file_pairs(struct diff_options *o)
 
                for (i = 0; i < esm.nr; i++)
                        free((void *)esm.buf[i].line);
+               esm.nr = 0;
+
+               o->emitted_symbols = NULL;
        }
-       esm.nr = 0;
 }
 
 void diff_flush(struct diff_options *options)
@@ -5543,12 +6267,7 @@ void diff_flush(struct diff_options *options)
            dirstat_by_line) {
                struct diffstat_t diffstat;
 
-               memset(&diffstat, 0, sizeof(struct diffstat_t));
-               for (i = 0; i < q->nr; i++) {
-                       struct diff_filepair *p = q->queue[i];
-                       if (check_pair_status(p))
-                               diff_flush_stat(p, options, &diffstat);
-               }
+               compute_diffstat(options, &diffstat, q);
                if (output_format & DIFF_FORMAT_NUMSTAT)
                        show_numstat(&diffstat, options);
                if (output_format & DIFF_FORMAT_DIFFSTAT)
@@ -5682,19 +6401,21 @@ static void diffcore_apply_filter(struct diff_options *options)
 }
 
 /* Check whether two filespecs with the same mode and size are identical */
-static int diff_filespec_is_identical(struct diff_filespec *one,
+static int diff_filespec_is_identical(struct repository *r,
+                                     struct diff_filespec *one,
                                      struct diff_filespec *two)
 {
        if (S_ISGITLINK(one->mode))
                return 0;
-       if (diff_populate_filespec(one, 0))
+       if (diff_populate_filespec(r, one, 0))
                return 0;
-       if (diff_populate_filespec(two, 0))
+       if (diff_populate_filespec(r, two, 0))
                return 0;
        return !memcmp(one->data, two->data, one->size);
 }
 
-static int diff_filespec_check_stat_unmatch(struct diff_filepair *p)
+static int diff_filespec_check_stat_unmatch(struct repository *r,
+                                           struct diff_filepair *p)
 {
        if (p->done_skip_stat_unmatch)
                return p->skip_stat_unmatch_result;
@@ -5718,10 +6439,10 @@ static int diff_filespec_check_stat_unmatch(struct diff_filepair *p)
            !DIFF_FILE_VALID(p->two) ||
            (p->one->oid_valid && p->two->oid_valid) ||
            (p->one->mode != p->two->mode) ||
-           diff_populate_filespec(p->one, CHECK_SIZE_ONLY) ||
-           diff_populate_filespec(p->two, CHECK_SIZE_ONLY) ||
+           diff_populate_filespec(r, p->one, CHECK_SIZE_ONLY) ||
+           diff_populate_filespec(r, p->two, CHECK_SIZE_ONLY) ||
            (p->one->size != p->two->size) ||
-           !diff_filespec_is_identical(p->one, p->two)) /* (2) */
+           !diff_filespec_is_identical(r, p->one, p->two)) /* (2) */
                p->skip_stat_unmatch_result = 1;
        return p->skip_stat_unmatch_result;
 }
@@ -5736,7 +6457,7 @@ static void diffcore_skip_stat_unmatch(struct diff_options *diffopt)
        for (i = 0; i < q->nr; i++) {
                struct diff_filepair *p = q->queue[i];
 
-               if (diff_filespec_check_stat_unmatch(p))
+               if (diff_filespec_check_stat_unmatch(diffopt->repo, p))
                        diff_q(&outq, p);
                else {
                        /*
@@ -5764,27 +6485,61 @@ static int diffnamecmp(const void *a_, const void *b_)
        return strcmp(name_a, name_b);
 }
 
-void diffcore_fix_diff_index(struct diff_options *options)
+void diffcore_fix_diff_index(void)
 {
        struct diff_queue_struct *q = &diff_queued_diff;
        QSORT(q->queue, q->nr, diffnamecmp);
 }
 
+static void add_if_missing(struct repository *r,
+                          struct oid_array *to_fetch,
+                          const struct diff_filespec *filespec)
+{
+       if (filespec && filespec->oid_valid &&
+           !S_ISGITLINK(filespec->mode) &&
+           oid_object_info_extended(r, &filespec->oid, NULL,
+                                    OBJECT_INFO_FOR_PREFETCH))
+               oid_array_append(to_fetch, &filespec->oid);
+}
+
 void diffcore_std(struct diff_options *options)
 {
+       if (options->repo == the_repository && has_promisor_remote()) {
+               /*
+                * Prefetch the diff pairs that are about to be flushed.
+                */
+               int i;
+               struct diff_queue_struct *q = &diff_queued_diff;
+               struct oid_array to_fetch = OID_ARRAY_INIT;
+
+               for (i = 0; i < q->nr; i++) {
+                       struct diff_filepair *p = q->queue[i];
+                       add_if_missing(options->repo, &to_fetch, p->one);
+                       add_if_missing(options->repo, &to_fetch, p->two);
+               }
+               if (to_fetch.nr)
+                       /*
+                        * NEEDSWORK: Consider deduplicating the OIDs sent.
+                        */
+                       promisor_remote_get_direct(options->repo,
+                                                  to_fetch.oid, to_fetch.nr);
+               oid_array_clear(&to_fetch);
+       }
+
        /* NOTE please keep the following in sync with diff_tree_combined() */
        if (options->skip_stat_unmatch)
                diffcore_skip_stat_unmatch(options);
        if (!options->found_follow) {
                /* See try_to_follow_renames() in tree-diff.c */
                if (options->break_opt != -1)
-                       diffcore_break(options->break_opt);
+                       diffcore_break(options->repo,
+                                      options->break_opt);
                if (options->detect_rename)
                        diffcore_rename(options);
                if (options->break_opt != -1)
                        diffcore_merge_broken();
        }
-       if (options->pickaxe)
+       if (options->pickaxe_opts & DIFF_PICKAXE_KINDS_MASK)
                diffcore_pickaxe(options);
        if (options->orderfile)
                diffcore_order(options->orderfile);
@@ -5845,6 +6600,20 @@ static int is_submodule_ignored(const char *path, struct diff_options *options)
        return ignored;
 }
 
+void compute_diffstat(struct diff_options *options,
+                     struct diffstat_t *diffstat,
+                     struct diff_queue_struct *q)
+{
+       int i;
+
+       memset(diffstat, 0, sizeof(struct diffstat_t));
+       for (i = 0; i < q->nr; i++) {
+               struct diff_filepair *p = q->queue[i];
+               if (check_pair_status(p))
+                       diff_flush_stat(p, options, diffstat);
+       }
+}
+
 void diff_addremove(struct diff_options *options,
                    int addremove, unsigned mode,
                    const struct object_id *oid,
@@ -5929,7 +6698,7 @@ void diff_change(struct diff_options *options,
                return;
 
        if (options->flags.quick && options->skip_stat_unmatch &&
-           !diff_filespec_check_stat_unmatch(p))
+           !diff_filespec_check_stat_unmatch(options->repo, p))
                return;
 
        options->flags.has_changes = 1;
@@ -5951,8 +6720,10 @@ struct diff_filepair *diff_unmerge(struct diff_options *options, const char *pat
        return pair;
 }
 
-static char *run_textconv(const char *pgm, struct diff_filespec *spec,
-               size_t *outsize)
+static char *run_textconv(struct repository *r,
+                         const char *pgm,
+                         struct diff_filespec *spec,
+                         size_t *outsize)
 {
        struct diff_tempfile *temp;
        const char *argv[3];
@@ -5961,7 +6732,7 @@ static char *run_textconv(const char *pgm, struct diff_filespec *spec,
        struct strbuf buf = STRBUF_INIT;
        int err = 0;
 
-       temp = prepare_temp_file(spec->path, spec);
+       temp = prepare_temp_file(r, spec->path, spec);
        *arg++ = pgm;
        *arg++ = temp->name;
        *arg = NULL;
@@ -5988,7 +6759,8 @@ static char *run_textconv(const char *pgm, struct diff_filespec *spec,
        return strbuf_detach(&buf, outsize);
 }
 
-size_t fill_textconv(struct userdiff_driver *driver,
+size_t fill_textconv(struct repository *r,
+                    struct userdiff_driver *driver,
                     struct diff_filespec *df,
                     char **outbuf)
 {
@@ -5999,14 +6771,14 @@ size_t fill_textconv(struct userdiff_driver *driver,
                        *outbuf = "";
                        return 0;
                }
-               if (diff_populate_filespec(df, 0))
+               if (diff_populate_filespec(r, df, 0))
                        die("unable to read files to diff");
                *outbuf = df->data;
                return df->size;
        }
 
        if (!driver->textconv)
-               die("BUG: fill_textconv called with non-textconv driver");
+               BUG("fill_textconv called with non-textconv driver");
 
        if (driver->textconv_cache && df->oid_valid) {
                *outbuf = notes_cache_get(driver->textconv_cache,
@@ -6016,7 +6788,7 @@ size_t fill_textconv(struct userdiff_driver *driver,
                        return size;
        }
 
-       *outbuf = run_textconv(driver->textconv, df, &size);
+       *outbuf = run_textconv(r, driver->textconv, df, &size);
        if (!*outbuf)
                die("unable to read files to diff");
 
@@ -6036,7 +6808,8 @@ size_t fill_textconv(struct userdiff_driver *driver,
        return size;
 }
 
-int textconv_object(const char *path,
+int textconv_object(struct repository *r,
+                   const char *path,
                    unsigned mode,
                    const struct object_id *oid,
                    int oid_valid,
@@ -6048,13 +6821,13 @@ int textconv_object(const char *path,
 
        df = alloc_filespec(path);
        fill_filespec(df, oid, oid_valid, mode);
-       textconv = get_textconv(df);
+       textconv = get_textconv(r, df);
        if (!textconv) {
                free_filespec(df);
                return 0;
        }
 
-       *buf_size = fill_textconv(textconv, df, buf);
+       *buf_size = fill_textconv(r, textconv, df, buf);
        free_filespec(df);
        return 1;
 }