[thirdparty/git.git] / range-diff.c

#include "cache.h"
#include "range-diff.h"
#include "string-list.h"
#include "run-command.h"
#include "strvec.h"
#include "hashmap.h"
#include "xdiff-interface.h"
#include "linear-assignment.h"
#include "diffcore.h"
#include "commit.h"
#include "pretty.h"
#include "userdiff.h"
#include "apply.h"
#include "revision.h"

struct patch_util {
	/* For the search for an exact match */
	struct hashmap_entry e;
	const char *diff, *patch;

	int i, shown;
	int diffsize;
	size_t diff_offset;
	/* the index of the matching item in the other branch, or -1 */
	int matching;
	struct object_id oid;
};

/*
 * Reads the patches into a string list, with the `util` field being populated
 * as struct object_id (will need to be free()d).
 */
static int read_patches(const char *range, struct string_list *list,
			const struct strvec *other_arg)
{
	struct child_process cp = CHILD_PROCESS_INIT;
	struct strbuf buf = STRBUF_INIT, contents = STRBUF_INIT;
	struct patch_util *util = NULL;
	int in_header = 1;
	char *line, *current_filename = NULL;
	ssize_t len;
	size_t size;
	int ret = -1;

	strvec_pushl(&cp.args, "log", "--no-color", "-p", "--no-merges",
		     "--reverse", "--date-order", "--decorate=no",
		     "--no-prefix", "--submodule=short",
		     /*
		      * Choose indicators that are not used anywhere
		      * else in diffs, but still look reasonable
		      * (e.g. will not be confusing when debugging)
		      */
		     "--output-indicator-new=>",
		     "--output-indicator-old=<",
		     "--output-indicator-context=#",
		     "--no-abbrev-commit",
		     "--pretty=medium",
		     "--notes",
		     NULL);
	if (other_arg)
		strvec_pushv(&cp.args, other_arg->v);
	strvec_push(&cp.args, range);
	cp.out = -1;
	cp.no_stdin = 1;
	cp.git_cmd = 1;

	if (start_command(&cp))
		return error_errno(_("could not start `log`"));
	if (strbuf_read(&contents, cp.out, 0) < 0) {
		error_errno(_("could not read `log` output"));
		finish_command(&cp);
		goto cleanup;
	}
	if (finish_command(&cp))
		goto cleanup;

	line = contents.buf;
	size = contents.len;
	for (; size > 0; size -= len, line += len) {
		const char *p;
		char *eol;

		eol = memchr(line, '\n', size);
		if (eol) {
			*eol = '\0';
			len = eol + 1 - line;
		} else {
			len = size;
		}

		if (skip_prefix(line, "commit ", &p)) {
			if (util) {
				string_list_append(list, buf.buf)->util = util;
				strbuf_reset(&buf);
			}
			CALLOC_ARRAY(util, 1);
			if (get_oid(p, &util->oid)) {
				error(_("could not parse commit '%s'"), p);
				FREE_AND_NULL(util);
				string_list_clear(list, 1);
				goto cleanup;
			}
			util->matching = -1;
			in_header = 1;
			continue;
		}

		if (!util) {
			error(_("could not parse first line of `log` output: "
				"did not start with 'commit ': '%s'"),
			      line);
			string_list_clear(list, 1);
			goto cleanup;
		}

		if (starts_with(line, "diff --git")) {
			struct patch patch = { 0 };
			struct strbuf root = STRBUF_INIT;
			int linenr = 0;
			int orig_len;

			in_header = 0;
			strbuf_addch(&buf, '\n');
			if (!util->diff_offset)
				util->diff_offset = buf.len;
			if (eol)
				*eol = '\n';
			orig_len = len;
			len = parse_git_diff_header(&root, &linenr, 0, line,
						    len, size, &patch);
			if (len < 0) {
				error(_("could not parse git header '%.*s'"),
				      orig_len, line);
				FREE_AND_NULL(util);
				string_list_clear(list, 1);
				goto cleanup;
			}
			strbuf_addstr(&buf, " ## ");
			if (patch.is_new > 0)
				strbuf_addf(&buf, "%s (new)", patch.new_name);
			else if (patch.is_delete > 0)
				strbuf_addf(&buf, "%s (deleted)", patch.old_name);
			else if (patch.is_rename)
				strbuf_addf(&buf, "%s => %s", patch.old_name, patch.new_name);
			else
				strbuf_addstr(&buf, patch.new_name);

			free(current_filename);
			if (patch.is_delete > 0)
				current_filename = xstrdup(patch.old_name);
			else
				current_filename = xstrdup(patch.new_name);

			if (patch.new_mode && patch.old_mode &&
			    patch.old_mode != patch.new_mode)
				strbuf_addf(&buf, " (mode change %06o => %06o)",
					    patch.old_mode, patch.new_mode);

			strbuf_addstr(&buf, " ##");
			release_patch(&patch);
		} else if (in_header) {
			if (starts_with(line, "Author: ")) {
				strbuf_addstr(&buf, " ## Metadata ##\n");
				strbuf_addstr(&buf, line);
				strbuf_addstr(&buf, "\n\n");
				strbuf_addstr(&buf, " ## Commit message ##\n");
			} else if (starts_with(line, "Notes") &&
				   line[strlen(line) - 1] == ':') {
				strbuf_addstr(&buf, "\n\n");
				/* strip the trailing colon */
				strbuf_addf(&buf, " ## %.*s ##\n",
					    (int)(strlen(line) - 1), line);
			} else if (starts_with(line, "    ")) {
				p = line + len - 2;
				while (isspace(*p) && p >= line)
					p--;
				strbuf_add(&buf, line, p - line + 1);
				strbuf_addch(&buf, '\n');
			}
			continue;
		} else if (skip_prefix(line, "@@ ", &p)) {
			p = strstr(p, "@@");
			strbuf_addstr(&buf, "@@");
			if (current_filename && p[2])
				strbuf_addf(&buf, " %s:", current_filename);
			if (p)
				strbuf_addstr(&buf, p + 2);
		} else if (!line[0])
			/*
			 * A completely blank (not ' \n', which is context)
			 * line is not valid in a diff.  We skip it
			 * silently, because this neatly handles the blank
			 * separator line between commits in git-log
			 * output.
			 */
			continue;
		else if (line[0] == '>') {
			strbuf_addch(&buf, '+');
			strbuf_addstr(&buf, line + 1);
		} else if (line[0] == '<') {
			strbuf_addch(&buf, '-');
			strbuf_addstr(&buf, line + 1);
		} else if (line[0] == '#') {
			strbuf_addch(&buf, ' ');
			strbuf_addstr(&buf, line + 1);
		} else {
			strbuf_addch(&buf, ' ');
			strbuf_addstr(&buf, line);
		}

		strbuf_addch(&buf, '\n');
		util->diffsize++;
	}

	ret = 0;
cleanup:
	strbuf_release(&contents);

	if (util)
		string_list_append(list, buf.buf)->util = util;
	strbuf_release(&buf);
	free(current_filename);

	return ret;
}

static int patch_util_cmp(const void *dummy, const struct patch_util *a,
			  const struct patch_util *b, const char *keydata)
{
	return strcmp(a->diff, keydata ? keydata : b->diff);
}

static void find_exact_matches(struct string_list *a, struct string_list *b)
{
	struct hashmap map = HASHMAP_INIT((hashmap_cmp_fn)patch_util_cmp, NULL);
	int i;

	/* First, add the patches of a to a hash map */
	for (i = 0; i < a->nr; i++) {
		struct patch_util *util = a->items[i].util;

		util->i = i;
		util->patch = a->items[i].string;
		util->diff = util->patch + util->diff_offset;
		hashmap_entry_init(&util->e, strhash(util->diff));
		hashmap_add(&map, &util->e);
	}

	/* Now try to find exact matches in b */
	for (i = 0; i < b->nr; i++) {
		struct patch_util *util = b->items[i].util, *other;

		util->i = i;
		util->patch = b->items[i].string;
		util->diff = util->patch + util->diff_offset;
		hashmap_entry_init(&util->e, strhash(util->diff));
		other = hashmap_remove_entry(&map, util, e, NULL);
		if (other) {
			if (other->matching >= 0)
				BUG("already assigned!");

			other->matching = i;
			util->matching = other->i;
		}
	}

	hashmap_clear(&map);
}

static int diffsize_consume(void *data, char *line, unsigned long len)
{
	(*(int *)data)++;
	return 0;
}

static void diffsize_hunk(void *data, long ob, long on, long nb, long nn,
			  const char *funcline, long funclen)
{
	diffsize_consume(data, NULL, 0);
}

static int diffsize(const char *a, const char *b)
{
	xpparam_t pp = { 0 };
	xdemitconf_t cfg = { 0 };
	mmfile_t mf1, mf2;
	int count = 0;

	mf1.ptr = (char *)a;
	mf1.size = strlen(a);
	mf2.ptr = (char *)b;
	mf2.size = strlen(b);

	cfg.ctxlen = 3;
	if (!xdi_diff_outf(&mf1, &mf2,
			   diffsize_hunk, diffsize_consume, &count,
			   &pp, &cfg))
		return count;

	error(_("failed to generate diff"));
	return COST_MAX;
}

static void get_correspondences(struct string_list *a, struct string_list *b,
				int creation_factor)
{
	int n = a->nr + b->nr;
	int *cost, c, *a2b, *b2a;
	int i, j;

	ALLOC_ARRAY(cost, st_mult(n, n));
	ALLOC_ARRAY(a2b, n);
	ALLOC_ARRAY(b2a, n);

	for (i = 0; i < a->nr; i++) {
		struct patch_util *a_util = a->items[i].util;

		for (j = 0; j < b->nr; j++) {
			struct patch_util *b_util = b->items[j].util;

			if (a_util->matching == j)
				c = 0;
			else if (a_util->matching < 0 && b_util->matching < 0)
				c = diffsize(a_util->diff, b_util->diff);
			else
				c = COST_MAX;
			cost[i + n * j] = c;
		}

		c = a_util->matching < 0 ?
			a_util->diffsize * creation_factor / 100 : COST_MAX;
		for (j = b->nr; j < n; j++)
			cost[i + n * j] = c;
	}

	for (j = 0; j < b->nr; j++) {
		struct patch_util *util = b->items[j].util;

		c = util->matching < 0 ?
			util->diffsize * creation_factor / 100 : COST_MAX;
		for (i = a->nr; i < n; i++)
			cost[i + n * j] = c;
	}

	for (i = a->nr; i < n; i++)
		for (j = b->nr; j < n; j++)
			cost[i + n * j] = 0;

	compute_assignment(n, n, cost, a2b, b2a);

	for (i = 0; i < a->nr; i++)
		if (a2b[i] >= 0 && a2b[i] < b->nr) {
			struct patch_util *a_util = a->items[i].util;
			struct patch_util *b_util = b->items[a2b[i]].util;

			a_util->matching = a2b[i];
			b_util->matching = i;
		}

	free(cost);
	free(a2b);
	free(b2a);
}

static void output_pair_header(struct diff_options *diffopt,
			       int patch_no_width,
			       struct strbuf *buf,
			       struct strbuf *dashes,
			       struct patch_util *a_util,
			       struct patch_util *b_util)
{
	struct object_id *oid = a_util ? &a_util->oid : &b_util->oid;
	struct commit *commit;
	char status;
	const char *color_reset = diff_get_color_opt(diffopt, DIFF_RESET);
	const char *color_old = diff_get_color_opt(diffopt, DIFF_FILE_OLD);
	const char *color_new = diff_get_color_opt(diffopt, DIFF_FILE_NEW);
	const char *color_commit = diff_get_color_opt(diffopt, DIFF_COMMIT);
	const char *color;

	if (!dashes->len)
		strbuf_addchars(dashes, '-',
				strlen(find_unique_abbrev(oid,
							  DEFAULT_ABBREV)));

	if (!b_util) {
		color = color_old;
		status = '<';
	} else if (!a_util) {
		color = color_new;
		status = '>';
	} else if (strcmp(a_util->patch, b_util->patch)) {
		color = color_commit;
		status = '!';
	} else {
		color = color_commit;
		status = '=';
	}

	strbuf_reset(buf);
	strbuf_addstr(buf, status == '!' ? color_old : color);
	if (!a_util)
		strbuf_addf(buf, "%*s:  %s ", patch_no_width, "-", dashes->buf);
	else
		strbuf_addf(buf, "%*d:  %s ", patch_no_width, a_util->i + 1,
			    find_unique_abbrev(&a_util->oid, DEFAULT_ABBREV));

	if (status == '!')
		strbuf_addf(buf, "%s%s", color_reset, color);
	strbuf_addch(buf, status);
	if (status == '!')
		strbuf_addf(buf, "%s%s", color_reset, color_new);

	if (!b_util)
		strbuf_addf(buf, " %*s:  %s", patch_no_width, "-", dashes->buf);
	else
		strbuf_addf(buf, " %*d:  %s", patch_no_width, b_util->i + 1,
			    find_unique_abbrev(&b_util->oid, DEFAULT_ABBREV));

	commit = lookup_commit_reference(the_repository, oid);
	if (commit) {
		if (status == '!')
			strbuf_addf(buf, "%s%s", color_reset, color);

		strbuf_addch(buf, ' ');
		pp_commit_easy(CMIT_FMT_ONELINE, commit, buf);
	}
	strbuf_addf(buf, "%s\n", color_reset);

	fwrite(buf->buf, buf->len, 1, diffopt->file);
}

static struct userdiff_driver section_headers = {
	.funcname = { "^ ## (.*) ##$\n"
		      "^.?@@ (.*)$", REG_EXTENDED }
};

static struct diff_filespec *get_filespec(const char *name, const char *p)
{
	struct diff_filespec *spec = alloc_filespec(name);

	fill_filespec(spec, null_oid(), 0, 0100644);
	spec->data = (char *)p;
	spec->size = strlen(p);
	spec->should_munmap = 0;
	spec->is_stdin = 1;
	spec->driver = &section_headers;

	return spec;
}

static void patch_diff(const char *a, const char *b,
		       struct diff_options *diffopt)
{
	diff_queue(&diff_queued_diff,
		   get_filespec("a", a), get_filespec("b", b));

	diffcore_std(diffopt);
	diff_flush(diffopt);
}

static struct strbuf *output_prefix_cb(struct diff_options *opt, void *data)
{
	return data;
}

static void output(struct string_list *a, struct string_list *b,
		   struct range_diff_options *range_diff_opts)
{
	struct strbuf buf = STRBUF_INIT, dashes = STRBUF_INIT;
	int patch_no_width = decimal_width(1 + (a->nr > b->nr ? a->nr : b->nr));
	int i = 0, j = 0;
	struct diff_options opts;
	struct strbuf indent = STRBUF_INIT;

	if (range_diff_opts->diffopt)
		memcpy(&opts, range_diff_opts->diffopt, sizeof(opts));
	else
		diff_setup(&opts);

	opts.no_free = 1;
	if (!opts.output_format)
		opts.output_format = DIFF_FORMAT_PATCH;
	opts.flags.suppress_diff_headers = 1;
	opts.flags.dual_color_diffed_diffs =
		range_diff_opts->dual_color;
	opts.flags.suppress_hunk_header_line_count = 1;
	opts.output_prefix = output_prefix_cb;
	strbuf_addstr(&indent, "    ");
	opts.output_prefix_data = &indent;
	diff_setup_done(&opts);

	/*
	 * We assume the user is really more interested in the second argument
	 * ("newer" version). To that end, we print the output in the order of
	 * the RHS (the `b` parameter). To put the LHS (the `a` parameter)
	 * commits that are no longer in the RHS into a good place, we place
	 * them once we have shown all of their predecessors in the LHS.
	 */

	while (i < a->nr || j < b->nr) {
		struct patch_util *a_util, *b_util;
		a_util = i < a->nr ? a->items[i].util : NULL;
		b_util = j < b->nr ? b->items[j].util : NULL;

		/* Skip all the already-shown commits from the LHS. */
		while (i < a->nr && a_util->shown)
			a_util = ++i < a->nr ? a->items[i].util : NULL;

		/* Show unmatched LHS commit whose predecessors were shown. */
		if (i < a->nr && a_util->matching < 0) {
			if (!range_diff_opts->right_only)
				output_pair_header(&opts, patch_no_width,
					   &buf, &dashes, a_util, NULL);
			i++;
			continue;
		}

		/* Show unmatched RHS commits. */
		while (j < b->nr && b_util->matching < 0) {
			if (!range_diff_opts->left_only)
				output_pair_header(&opts, patch_no_width,
					   &buf, &dashes, NULL, b_util);
			b_util = ++j < b->nr ? b->items[j].util : NULL;
		}

		/* Show matching LHS/RHS pair. */
		if (j < b->nr) {
			a_util = a->items[b_util->matching].util;
			output_pair_header(&opts, patch_no_width,
					   &buf, &dashes, a_util, b_util);
			if (!(opts.output_format & DIFF_FORMAT_NO_OUTPUT))
				patch_diff(a->items[b_util->matching].string,
					   b->items[j].string, &opts);
			a_util->shown = 1;
			j++;
		}
	}
	strbuf_release(&buf);
	strbuf_release(&dashes);
	strbuf_release(&indent);
	opts.no_free = 0;
	diff_free(&opts);
}

int show_range_diff(const char *range1, const char *range2,
		    struct range_diff_options *range_diff_opts)
{
	int res = 0;

	struct string_list branch1 = STRING_LIST_INIT_DUP;
	struct string_list branch2 = STRING_LIST_INIT_DUP;

	if (range_diff_opts->left_only && range_diff_opts->right_only)
		res = error(_("options '%s' and '%s' cannot be used together"), "--left-only", "--right-only");

	if (!res && read_patches(range1, &branch1, range_diff_opts->other_arg))
		res = error(_("could not parse log for '%s'"), range1);
	if (!res && read_patches(range2, &branch2, range_diff_opts->other_arg))
		res = error(_("could not parse log for '%s'"), range2);

	if (!res) {
		find_exact_matches(&branch1, &branch2);
		get_correspondences(&branch1, &branch2,
				    range_diff_opts->creation_factor);
		output(&branch1, &branch2, range_diff_opts);
	}

	string_list_clear(&branch1, 1);
	string_list_clear(&branch2, 1);

	return res;
}

int is_range_diff_range(const char *arg)
{
	char *copy = xstrdup(arg); /* setup_revisions() modifies it */
	const char *argv[] = { "", copy, "--", NULL };
	int i, positive = 0, negative = 0;
	struct rev_info revs;

	init_revisions(&revs, NULL);
	if (setup_revisions(3, argv, &revs, NULL) == 1) {
		for (i = 0; i < revs.pending.nr; i++)
			if (revs.pending.objects[i].item->flags & UNINTERESTING)
				negative++;
			else
				positive++;
		for (i = 0; i < revs.pending.nr; i++) {
			struct object *obj = revs.pending.objects[i].item;

			if (obj->type == OBJ_COMMIT)
				clear_commit_marks((struct commit *)obj,
						   ALL_REV_FLAGS);
		}
	}

	free(copy);
	object_array_clear(&revs.pending);
	return negative > 0 && positive > 0;
}
Commit	Line	Data
d9c66f0b JS	1	#include "cache.h"
	2	#include "range-diff.h"
	3	#include "string-list.h"
	4	#include "run-command.h"
dbbcd44f	5	#include "strvec.h"
d9c66f0b JS	6	#include "hashmap.h"
	7	#include "xdiff-interface.h"
	8	#include "linear-assignment.h"
c8c5e43a	9	#include "diffcore.h"
eb0be38c JS	10	#include "commit.h"
eb0be38c JS	11	#include "pretty.h"
4eba1fe6	12	#include "userdiff.h"
b66885a3	13	#include "apply.h"
359f0d75	14	#include "revision.h"
d9c66f0b JS	15
	16	struct patch_util {
	17	/* For the search for an exact match */
	18	struct hashmap_entry e;
	19	const char diff, patch;
	20
9dc46e02	21	int i, shown;
d9c66f0b JS	22	int diffsize;
	23	size_t diff_offset;
	24	/* the index of the matching item in the other branch, or -1 */
	25	int matching;
	26	struct object_id oid;
	27	};
	28
	29	/*
	30	* Reads the patches into a string list, with the `util` field being populated
	31	* as struct object_id (will need to be free()d).
	32	*/
bd361918	33	static int read_patches(const char range, struct string_list list,
c972bf4c	34	const struct strvec *other_arg)
d9c66f0b JS	35	{
d9c66f0b JS	36	struct child_process cp = CHILD_PROCESS_INIT;
44b67cb6	37	struct strbuf buf = STRBUF_INIT, contents = STRBUF_INIT;
d9c66f0b JS	38	struct patch_util *util = NULL;
d9c66f0b JS	39	int in_header = 1;
444e0969	40	char line, current_filename = NULL;
c4d59073	41	ssize_t len;
44b67cb6	42	size_t size;
2d102c2b	43	int ret = -1;
d9c66f0b	44
c972bf4c	45	strvec_pushl(&cp.args, "log", "--no-color", "-p", "--no-merges",
f6d8942b	46	"--reverse", "--date-order", "--decorate=no",
04b1f1fd	47	"--no-prefix", "--submodule=short",
f6d8942b JK	48	/*
	49	* Choose indicators that are not used anywhere
	50	* else in diffs, but still look reasonable
	51	* (e.g. will not be confusing when debugging)
	52	*/
	53	"--output-indicator-new=>",
	54	"--output-indicator-old=<",
	55	"--output-indicator-context=#",
	56	"--no-abbrev-commit",
	57	"--pretty=medium",
	58	"--notes",
	59	NULL);
bd361918	60	if (other_arg)
d70a9eb6	61	strvec_pushv(&cp.args, other_arg->v);
c972bf4c	62	strvec_push(&cp.args, range);
d9c66f0b JS	63	cp.out = -1;
	64	cp.no_stdin = 1;
	65	cp.git_cmd = 1;
	66
	67	if (start_command(&cp))
	68	return error_errno(_("could not start `log`"));
44b67cb6	69	if (strbuf_read(&contents, cp.out, 0) < 0) {
d9c66f0b JS	70	error_errno(_("could not read `log` output"));
d9c66f0b JS	71	finish_command(&cp);
2d102c2b	72	goto cleanup;
d9c66f0b	73	}
5189bb87	74	if (finish_command(&cp))
2d102c2b	75	goto cleanup;
d9c66f0b	76
44b67cb6 TG	77	line = contents.buf;
44b67cb6 TG	78	size = contents.len;
47ac23d3	79	for (; size > 0; size -= len, line += len) {
d9c66f0b	80	const char *p;
7c86d365 JK	81	char *eol;
	82
	83	eol = memchr(line, '\n', size);
	84	if (eol) {
	85	*eol = '\0';
	86	len = eol + 1 - line;
	87	} else {
	88	len = size;
	89	}
d9c66f0b	90
44b67cb6	91	if (skip_prefix(line, "commit ", &p)) {
d9c66f0b JS	92	if (util) {
	93	string_list_append(list, buf.buf)->util = util;
	94	strbuf_reset(&buf);
	95	}
ca56dadb	96	CALLOC_ARRAY(util, 1);
d9c66f0b JS	97	if (get_oid(p, &util->oid)) {
d9c66f0b JS	98	error(_("could not parse commit '%s'"), p);
2d102c2b	99	FREE_AND_NULL(util);
d9c66f0b	100	string_list_clear(list, 1);
2d102c2b	101	goto cleanup;
d9c66f0b JS	102	}
	103	util->matching = -1;
	104	in_header = 1;
	105	continue;
	106	}
	107
8cf51561 VD	108	if (!util) {
	109	error(_("could not parse first line of `log` output: "
	110	"did not start with 'commit ': '%s'"),
	111	line);
	112	string_list_clear(list, 1);
2d102c2b	113	goto cleanup;
8cf51561 VD	114	}
8cf51561 VD	115
44b67cb6	116	if (starts_with(line, "diff --git")) {
b66885a3 TG	117	struct patch patch = { 0 };
	118	struct strbuf root = STRBUF_INIT;
	119	int linenr = 0;
8d1675eb	120	int orig_len;
b66885a3	121
d9c66f0b JS	122	in_header = 0;
	123	strbuf_addch(&buf, '\n');
	124	if (!util->diff_offset)
	125	util->diff_offset = buf.len;
7c86d365 JK	126	if (eol)
7c86d365 JK	127	*eol = '\n';
8d1675eb	128	orig_len = len;
937b76ed	129	len = parse_git_diff_header(&root, &linenr, 0, line,
b66885a3	130	len, size, &patch);
a2d474ad JS	131	if (len < 0) {
	132	error(_("could not parse git header '%.*s'"),
	133	orig_len, line);
2d102c2b	134	FREE_AND_NULL(util);
a2d474ad	135	string_list_clear(list, 1);
2d102c2b	136	goto cleanup;
a2d474ad	137	}
b66885a3 TG	138	strbuf_addstr(&buf, " ## ");
	139	if (patch.is_new > 0)
	140	strbuf_addf(&buf, "%s (new)", patch.new_name);
	141	else if (patch.is_delete > 0)
	142	strbuf_addf(&buf, "%s (deleted)", patch.old_name);
	143	else if (patch.is_rename)
	144	strbuf_addf(&buf, "%s => %s", patch.old_name, patch.new_name);
	145	else
	146	strbuf_addstr(&buf, patch.new_name);
	147
444e0969 TG	148	free(current_filename);
	149	if (patch.is_delete > 0)
	150	current_filename = xstrdup(patch.old_name);
	151	else
	152	current_filename = xstrdup(patch.new_name);
	153
b66885a3 TG	154	if (patch.new_mode && patch.old_mode &&
	155	patch.old_mode != patch.new_mode)
	156	strbuf_addf(&buf, " (mode change %06o => %06o)",
	157	patch.old_mode, patch.new_mode);
	158
	159	strbuf_addstr(&buf, " ##");
4998e93f	160	release_patch(&patch);
d9c66f0b	161	} else if (in_header) {
44b67cb6	162	if (starts_with(line, "Author: ")) {
499352c2	163	strbuf_addstr(&buf, " ## Metadata ##\n");
44b67cb6	164	strbuf_addstr(&buf, line);
d9c66f0b	165	strbuf_addstr(&buf, "\n\n");
499352c2	166	strbuf_addstr(&buf, " ## Commit message ##\n");
9f726e1b DL	167	} else if (starts_with(line, "Notes") &&
	168	line[strlen(line) - 1] == ':') {
	169	strbuf_addstr(&buf, "\n\n");
	170	/* strip the trailing colon */
	171	strbuf_addf(&buf, " ## %.*s ##\n",
	172	(int)(strlen(line) - 1), line);
44b67cb6 TG	173	} else if (starts_with(line, " ")) {
	174	p = line + len - 2;
	175	while (isspace(*p) && p >= line)
	176	p--;
	177	strbuf_add(&buf, line, p - line + 1);
d9c66f0b JS	178	strbuf_addch(&buf, '\n');
	179	}
	180	continue;
e1db2630 TG	181	} else if (skip_prefix(line, "@@ ", &p)) {
e1db2630 TG	182	p = strstr(p, "@@");
444e0969 TG	183	strbuf_addstr(&buf, "@@");
	184	if (current_filename && p[2])
	185	strbuf_addf(&buf, " %s:", current_filename);
	186	if (p)
	187	strbuf_addstr(&buf, p + 2);
b66885a3	188	} else if (!line[0])
d9c66f0b JS	189	/*
	190	* A completely blank (not ' \n', which is context)
	191	* line is not valid in a diff. We skip it
	192	* silently, because this neatly handles the blank
	193	* separator line between commits in git-log
	194	* output.
d9c66f0b JS	195	*/
d9c66f0b JS	196	continue;
44b67cb6	197	else if (line[0] == '>') {
8d5ccb59	198	strbuf_addch(&buf, '+');
44b67cb6 TG	199	strbuf_addstr(&buf, line + 1);
44b67cb6 TG	200	} else if (line[0] == '<') {
8d5ccb59	201	strbuf_addch(&buf, '-');
44b67cb6 TG	202	strbuf_addstr(&buf, line + 1);
44b67cb6 TG	203	} else if (line[0] == '#') {
8d5ccb59	204	strbuf_addch(&buf, ' ');
44b67cb6	205	strbuf_addstr(&buf, line + 1);
8d5ccb59	206	} else {
2543a641	207	strbuf_addch(&buf, ' ');
44b67cb6	208	strbuf_addstr(&buf, line);
8d5ccb59	209	}
d9c66f0b JS	210
	211	strbuf_addch(&buf, '\n');
	212	util->diffsize++;
	213	}
2d102c2b ÆAB	214
	215	ret = 0;
	216	cleanup:
44b67cb6	217	strbuf_release(&contents);
d9c66f0b JS	218
	219	if (util)
	220	string_list_append(list, buf.buf)->util = util;
	221	strbuf_release(&buf);
444e0969	222	free(current_filename);
d9c66f0b	223
2d102c2b	224	return ret;
d9c66f0b JS	225	}
	226
	227	static int patch_util_cmp(const void dummy, const struct patch_util a,
1ca69225	228	const struct patch_util b, const char keydata)
d9c66f0b JS	229	{
	230	return strcmp(a->diff, keydata ? keydata : b->diff);
	231	}
	232
	233	static void find_exact_matches(struct string_list a, struct string_list b)
	234	{
b19315d8	235	struct hashmap map = HASHMAP_INIT((hashmap_cmp_fn)patch_util_cmp, NULL);
d9c66f0b JS	236	int i;
d9c66f0b JS	237
d9c66f0b JS	238	/* First, add the patches of a to a hash map */
	239	for (i = 0; i < a->nr; i++) {
	240	struct patch_util *util = a->items[i].util;
	241
	242	util->i = i;
	243	util->patch = a->items[i].string;
	244	util->diff = util->patch + util->diff_offset;
d22245a2	245	hashmap_entry_init(&util->e, strhash(util->diff));
b94e5c1d	246	hashmap_add(&map, &util->e);
d9c66f0b JS	247	}
	248
	249	/* Now try to find exact matches in b */
	250	for (i = 0; i < b->nr; i++) {
	251	struct patch_util util = b->items[i].util, other;
	252
	253	util->i = i;
	254	util->patch = b->items[i].string;
	255	util->diff = util->patch + util->diff_offset;
d22245a2	256	hashmap_entry_init(&util->e, strhash(util->diff));
404ab78e	257	other = hashmap_remove_entry(&map, util, e, NULL);
d9c66f0b JS	258	if (other) {
	259	if (other->matching >= 0)
	260	BUG("already assigned!");
	261
	262	other->matching = i;
	263	util->matching = other->i;
	264	}
	265	}
	266
6da1a258	267	hashmap_clear(&map);
d9c66f0b JS	268	}
d9c66f0b JS	269
a8d5eb6d	270	static int diffsize_consume(void data, char line, unsigned long len)
d9c66f0b JS	271	{
d9c66f0b JS	272	((int )data)++;
a8d5eb6d	273	return 0;
d9c66f0b JS	274	}
d9c66f0b JS	275
d2eb8093 JK	276	static void diffsize_hunk(void *data, long ob, long on, long nb, long nn,
	277	const char *funcline, long funclen)
	278	{
	279	diffsize_consume(data, NULL, 0);
	280	}
	281
d9c66f0b JS	282	static int diffsize(const char a, const char b)
	283	{
	284	xpparam_t pp = { 0 };
	285	xdemitconf_t cfg = { 0 };
	286	mmfile_t mf1, mf2;
	287	int count = 0;
	288
	289	mf1.ptr = (char *)a;
	290	mf1.size = strlen(a);
	291	mf2.ptr = (char *)b;
	292	mf2.size = strlen(b);
	293
	294	cfg.ctxlen = 3;
d2eb8093 JK	295	if (!xdi_diff_outf(&mf1, &mf2,
	296	diffsize_hunk, diffsize_consume, &count,
	297	&pp, &cfg))
d9c66f0b JS	298	return count;
	299
	300	error(_("failed to generate diff"));
	301	return COST_MAX;
	302	}
	303
	304	static void get_correspondences(struct string_list a, struct string_list b,
	305	int creation_factor)
	306	{
	307	int n = a->nr + b->nr;
	308	int cost, c, a2b, *b2a;
	309	int i, j;
	310
	311	ALLOC_ARRAY(cost, st_mult(n, n));
	312	ALLOC_ARRAY(a2b, n);
	313	ALLOC_ARRAY(b2a, n);
	314
	315	for (i = 0; i < a->nr; i++) {
	316	struct patch_util *a_util = a->items[i].util;
	317
	318	for (j = 0; j < b->nr; j++) {
	319	struct patch_util *b_util = b->items[j].util;
	320
	321	if (a_util->matching == j)
	322	c = 0;
	323	else if (a_util->matching < 0 && b_util->matching < 0)
	324	c = diffsize(a_util->diff, b_util->diff);
	325	else
	326	c = COST_MAX;
	327	cost[i + n * j] = c;
	328	}
	329
	330	c = a_util->matching < 0 ?
	331	a_util->diffsize * creation_factor / 100 : COST_MAX;
	332	for (j = b->nr; j < n; j++)
	333	cost[i + n * j] = c;
	334	}
	335
	336	for (j = 0; j < b->nr; j++) {
	337	struct patch_util *util = b->items[j].util;
	338
	339	c = util->matching < 0 ?
	340	util->diffsize * creation_factor / 100 : COST_MAX;
	341	for (i = a->nr; i < n; i++)
	342	cost[i + n * j] = c;
	343	}
	344
	345	for (i = a->nr; i < n; i++)
	346	for (j = b->nr; j < n; j++)
	347	cost[i + n * j] = 0;
	348
	349	compute_assignment(n, n, cost, a2b, b2a);
	350
	351	for (i = 0; i < a->nr; i++)
	352	if (a2b[i] >= 0 && a2b[i] < b->nr) {
	353	struct patch_util *a_util = a->items[i].util;
	354	struct patch_util *b_util = b->items[a2b[i]].util;
	355
	356	a_util->matching = a2b[i];
	357	b_util->matching = i;
	358	}
	359
	360	free(cost);
	361	free(a2b);
362	free(b2a);
363	}
364
faa1df86	365	static void output_pair_header(struct diff_options *diffopt,
d1f87a2d	366	int patch_no_width,
faa1df86	367	struct strbuf *buf,
eb0be38c JS	368	struct strbuf *dashes,
	369	struct patch_util *a_util,
	370	struct patch_util *b_util)
d9c66f0b	371	{
eb0be38c JS	372	struct object_id *oid = a_util ? &a_util->oid : &b_util->oid;
eb0be38c JS	373	struct commit *commit;
faa1df86 JS	374	char status;
	375	const char *color_reset = diff_get_color_opt(diffopt, DIFF_RESET);
	376	const char *color_old = diff_get_color_opt(diffopt, DIFF_FILE_OLD);
	377	const char *color_new = diff_get_color_opt(diffopt, DIFF_FILE_NEW);
	378	const char *color_commit = diff_get_color_opt(diffopt, DIFF_COMMIT);
	379	const char *color;
eb0be38c JS	380
	381	if (!dashes->len)
	382	strbuf_addchars(dashes, '-',
	383	strlen(find_unique_abbrev(oid,
	384	DEFAULT_ABBREV)));
	385
faa1df86 JS	386	if (!b_util) {
	387	color = color_old;
	388	status = '<';
	389	} else if (!a_util) {
	390	color = color_new;
	391	status = '>';
	392	} else if (strcmp(a_util->patch, b_util->patch)) {
	393	color = color_commit;
	394	status = '!';
	395	} else {
	396	color = color_commit;
	397	status = '=';
	398	}
	399
eb0be38c	400	strbuf_reset(buf);
faa1df86	401	strbuf_addstr(buf, status == '!' ? color_old : color);
eb0be38c	402	if (!a_util)
d1f87a2d	403	strbuf_addf(buf, "%*s: %s ", patch_no_width, "-", dashes->buf);
eb0be38c	404	else
d1f87a2d	405	strbuf_addf(buf, "%*d: %s ", patch_no_width, a_util->i + 1,
eb0be38c JS	406	find_unique_abbrev(&a_util->oid, DEFAULT_ABBREV));
eb0be38c JS	407
faa1df86 JS	408	if (status == '!')
	409	strbuf_addf(buf, "%s%s", color_reset, color);
	410	strbuf_addch(buf, status);
	411	if (status == '!')
	412	strbuf_addf(buf, "%s%s", color_reset, color_new);
eb0be38c JS	413
eb0be38c JS	414	if (!b_util)
d1f87a2d	415	strbuf_addf(buf, " %*s: %s", patch_no_width, "-", dashes->buf);
eb0be38c	416	else
d1f87a2d	417	strbuf_addf(buf, " %*d: %s", patch_no_width, b_util->i + 1,
eb0be38c JS	418	find_unique_abbrev(&b_util->oid, DEFAULT_ABBREV));
	419
	420	commit = lookup_commit_reference(the_repository, oid);
	421	if (commit) {
faa1df86 JS	422	if (status == '!')
	423	strbuf_addf(buf, "%s%s", color_reset, color);
	424
eb0be38c JS	425	strbuf_addch(buf, ' ');
	426	pp_commit_easy(CMIT_FMT_ONELINE, commit, buf);
	427	}
faa1df86	428	strbuf_addf(buf, "%s\n", color_reset);
eb0be38c	429
87f1b2d4	430	fwrite(buf->buf, buf->len, 1, diffopt->file);
d9c66f0b JS	431	}
d9c66f0b JS	432
499352c2 TG	433	static struct userdiff_driver section_headers = {
	434	.funcname = { "^ ## (.*) ##$\n"
	435	"^.?@@ (.*)$", REG_EXTENDED }
4eba1fe6 JS	436	};
4eba1fe6 JS	437
c8c5e43a JS	438	static struct diff_filespec get_filespec(const char name, const char *p)
	439	{
	440	struct diff_filespec *spec = alloc_filespec(name);
	441
14228447	442	fill_filespec(spec, null_oid(), 0, 0100644);
c8c5e43a JS	443	spec->data = (char *)p;
	444	spec->size = strlen(p);
	445	spec->should_munmap = 0;
	446	spec->is_stdin = 1;
499352c2	447	spec->driver = &section_headers;
c8c5e43a JS	448
	449	return spec;
	450	}
	451
	452	static void patch_diff(const char a, const char b,
1ca69225	453	struct diff_options *diffopt)
c8c5e43a JS	454	{
	455	diff_queue(&diff_queued_diff,
	456	get_filespec("a", a), get_filespec("b", b));
	457
	458	diffcore_std(diffopt);
	459	diff_flush(diffopt);
	460	}
	461
3e6046ed JS	462	static struct strbuf output_prefix_cb(struct diff_options opt, void *data)
	463	{
	464	return data;
	465	}
	466
c8c5e43a	467	static void output(struct string_list a, struct string_list b,
3e6046ed	468	struct range_diff_options *range_diff_opts)
d9c66f0b	469	{
eb0be38c	470	struct strbuf buf = STRBUF_INIT, dashes = STRBUF_INIT;
d1f87a2d	471	int patch_no_width = decimal_width(1 + (a->nr > b->nr ? a->nr : b->nr));
9dc46e02	472	int i = 0, j = 0;
3e6046ed JS	473	struct diff_options opts;
	474	struct strbuf indent = STRBUF_INIT;
	475
	476	if (range_diff_opts->diffopt)
	477	memcpy(&opts, range_diff_opts->diffopt, sizeof(opts));
	478	else
	479	diff_setup(&opts);
	480
709b3f32	481	opts.no_free = 1;
3e6046ed JS	482	if (!opts.output_format)
	483	opts.output_format = DIFF_FORMAT_PATCH;
	484	opts.flags.suppress_diff_headers = 1;
	485	opts.flags.dual_color_diffed_diffs =
	486	range_diff_opts->dual_color;
	487	opts.flags.suppress_hunk_header_line_count = 1;
	488	opts.output_prefix = output_prefix_cb;
	489	strbuf_addstr(&indent, " ");
	490	opts.output_prefix_data = &indent;
	491	diff_setup_done(&opts);
9dc46e02 JS	492
	493	/*
	494	* We assume the user is really more interested in the second argument
	495	* ("newer" version). To that end, we print the output in the order of
	496	* the RHS (the `b` parameter). To put the LHS (the `a` parameter)
	497	* commits that are no longer in the RHS into a good place, we place
	498	* them once we have shown all of their predecessors in the LHS.
	499	*/
	500
	501	while (i < a->nr \|\| j < b->nr) {
	502	struct patch_util a_util, b_util;
	503	a_util = i < a->nr ? a->items[i].util : NULL;
	504	b_util = j < b->nr ? b->items[j].util : NULL;
	505
	506	/* Skip all the already-shown commits from the LHS. */
	507	while (i < a->nr && a_util->shown)
	508	a_util = ++i < a->nr ? a->items[i].util : NULL;
	509
	510	/* Show unmatched LHS commit whose predecessors were shown. */
	511	if (i < a->nr && a_util->matching < 0) {
1e79f973 JS	512	if (!range_diff_opts->right_only)
1e79f973 JS	513	output_pair_header(&opts, patch_no_width,
faa1df86	514	&buf, &dashes, a_util, NULL);
9dc46e02 JS	515	i++;
	516	continue;
	517	}
d9c66f0b	518
9dc46e02 JS	519	/* Show unmatched RHS commits. */
9dc46e02 JS	520	while (j < b->nr && b_util->matching < 0) {
1e79f973 JS	521	if (!range_diff_opts->left_only)
1e79f973 JS	522	output_pair_header(&opts, patch_no_width,
faa1df86	523	&buf, &dashes, NULL, b_util);
9dc46e02	524	b_util = ++j < b->nr ? b->items[j].util : NULL;
d9c66f0b	525	}
d9c66f0b	526
9dc46e02 JS	527	/* Show matching LHS/RHS pair. */
	528	if (j < b->nr) {
	529	a_util = a->items[b_util->matching].util;
3e6046ed	530	output_pair_header(&opts, patch_no_width,
faa1df86	531	&buf, &dashes, a_util, b_util);
3e6046ed	532	if (!(opts.output_format & DIFF_FORMAT_NO_OUTPUT))
c8c5e43a	533	patch_diff(a->items[b_util->matching].string,
3e6046ed	534	b->items[j].string, &opts);
9dc46e02 JS	535	a_util->shown = 1;
	536	j++;
	537	}
d9c66f0b	538	}
eb0be38c JS	539	strbuf_release(&buf);
eb0be38c JS	540	strbuf_release(&dashes);
3e6046ed	541	strbuf_release(&indent);
709b3f32 RS	542	opts.no_free = 0;
709b3f32 RS	543	diff_free(&opts);
73a834e9 ES	544	}
73a834e9 ES	545
d9c66f0b	546	int show_range_diff(const char range1, const char range2,
f1ce6c19	547	struct range_diff_options *range_diff_opts)
d9c66f0b JS	548	{
	549	int res = 0;
	550
	551	struct string_list branch1 = STRING_LIST_INIT_DUP;
	552	struct string_list branch2 = STRING_LIST_INIT_DUP;
	553
1e79f973	554	if (range_diff_opts->left_only && range_diff_opts->right_only)
43ea635c	555	res = error(_("options '%s' and '%s' cannot be used together"), "--left-only", "--right-only");
1e79f973 JS	556
1e79f973 JS	557	if (!res && read_patches(range1, &branch1, range_diff_opts->other_arg))
d9c66f0b	558	res = error(_("could not parse log for '%s'"), range1);
f1ce6c19	559	if (!res && read_patches(range2, &branch2, range_diff_opts->other_arg))
d9c66f0b JS	560	res = error(_("could not parse log for '%s'"), range2);
	561
	562	if (!res) {
	563	find_exact_matches(&branch1, &branch2);
f1ce6c19 JS	564	get_correspondences(&branch1, &branch2,
f1ce6c19 JS	565	range_diff_opts->creation_factor);
3e6046ed	566	output(&branch1, &branch2, range_diff_opts);
d9c66f0b JS	567	}
	568
	569	string_list_clear(&branch1, 1);
	570	string_list_clear(&branch2, 1);
	571
	572	return res;
	573	}
679b5916 JS	574
	575	int is_range_diff_range(const char *arg)
	576	{
359f0d75 JS	577	char copy = xstrdup(arg); / setup_revisions() modifies it */
	578	const char *argv[] = { "", copy, "--", NULL };
	579	int i, positive = 0, negative = 0;
	580	struct rev_info revs;
	581
	582	init_revisions(&revs, NULL);
	583	if (setup_revisions(3, argv, &revs, NULL) == 1) {
	584	for (i = 0; i < revs.pending.nr; i++)
	585	if (revs.pending.objects[i].item->flags & UNINTERESTING)
	586	negative++;
	587	else
	588	positive++;
	589	for (i = 0; i < revs.pending.nr; i++) {
	590	struct object *obj = revs.pending.objects[i].item;
	591
	592	if (obj->type == OBJ_COMMIT)
	593	clear_commit_marks((struct commit *)obj,
	594	ALL_REV_FLAGS);
	595	}
	596	}
	597
	598	free(copy);
	599	object_array_clear(&revs.pending);
	600	return negative > 0 && positive > 0;
679b5916	601	}