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

#include "cache.h"
#include "environment.h"
#include "gettext.h"
#include "range-diff.h"
#include "object-name.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);
	strvec_push(&cp.args, range);
	if (other_arg)
		strvec_pushv(&cp.args, other_arg->v);
	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 (repo_get_oid(the_repository, 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 *cmp_data UNUSED,
			  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 UNUSED,
			     unsigned long len UNUSED)
{
	(*(int *)data)++;
	return 0;
}

static void diffsize_hunk(void *data,
			  long ob UNUSED, long on UNUSED,
			  long nb UNUSED, long nn UNUSED,
			  const char *func UNUSED, long funclen UNUSED)
{
	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;
	int abbrev = diffopt->abbrev;

	if (abbrev < 0)
		abbrev = DEFAULT_ABBREV;

	if (!dashes->len)
		strbuf_addchars(dashes, '-',
				strlen(repo_find_unique_abbrev(the_repository, oid, 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,
			    repo_find_unique_abbrev(the_repository, &a_util->oid, 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,
			    repo_find_unique_abbrev(the_repository, &b_util->oid, 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 UNUSED, 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
		repo_diff_setup(the_repository, &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;

	repo_init_revisions(the_repository, &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);
	release_revisions(&revs);
	return negative > 0 && positive > 0;
}
Commit	Line	Data
d9c66f0b	1	#include "cache.h"
32a8f510	2	#include "environment.h"
f394e093	3	#include "gettext.h"
d9c66f0b	4	#include "range-diff.h"
dabab1d6	5	#include "object-name.h"
d9c66f0b JS	6	#include "string-list.h"
d9c66f0b JS	7	#include "run-command.h"
dbbcd44f	8	#include "strvec.h"
d9c66f0b JS	9	#include "hashmap.h"
	10	#include "xdiff-interface.h"
	11	#include "linear-assignment.h"
c8c5e43a	12	#include "diffcore.h"
eb0be38c JS	13	#include "commit.h"
eb0be38c JS	14	#include "pretty.h"
4eba1fe6	15	#include "userdiff.h"
b66885a3	16	#include "apply.h"
359f0d75	17	#include "revision.h"
d9c66f0b JS	18
	19	struct patch_util {
	20	/* For the search for an exact match */
	21	struct hashmap_entry e;
	22	const char diff, patch;
	23
9dc46e02	24	int i, shown;
d9c66f0b JS	25	int diffsize;
	26	size_t diff_offset;
	27	/* the index of the matching item in the other branch, or -1 */
	28	int matching;
	29	struct object_id oid;
	30	};
	31
	32	/*
	33	* Reads the patches into a string list, with the `util` field being populated
	34	* as struct object_id (will need to be free()d).
	35	*/
bd361918	36	static int read_patches(const char range, struct string_list list,
c972bf4c	37	const struct strvec *other_arg)
d9c66f0b JS	38	{
d9c66f0b JS	39	struct child_process cp = CHILD_PROCESS_INIT;
44b67cb6	40	struct strbuf buf = STRBUF_INIT, contents = STRBUF_INIT;
d9c66f0b JS	41	struct patch_util *util = NULL;
d9c66f0b JS	42	int in_header = 1;
444e0969	43	char line, current_filename = NULL;
c4d59073	44	ssize_t len;
44b67cb6	45	size_t size;
2d102c2b	46	int ret = -1;
d9c66f0b	47
c972bf4c	48	strvec_pushl(&cp.args, "log", "--no-color", "-p", "--no-merges",
f6d8942b	49	"--reverse", "--date-order", "--decorate=no",
04b1f1fd	50	"--no-prefix", "--submodule=short",
f6d8942b JK	51	/*
	52	* Choose indicators that are not used anywhere
	53	* else in diffs, but still look reasonable
	54	* (e.g. will not be confusing when debugging)
	55	*/
	56	"--output-indicator-new=>",
	57	"--output-indicator-old=<",
	58	"--output-indicator-context=#",
	59	"--no-abbrev-commit",
	60	"--pretty=medium",
	61	"--notes",
	62	NULL);
b7574782	63	strvec_push(&cp.args, range);
bd361918	64	if (other_arg)
d70a9eb6	65	strvec_pushv(&cp.args, other_arg->v);
d9c66f0b JS	66	cp.out = -1;
	67	cp.no_stdin = 1;
	68	cp.git_cmd = 1;
	69
	70	if (start_command(&cp))
	71	return error_errno(_("could not start `log`"));
44b67cb6	72	if (strbuf_read(&contents, cp.out, 0) < 0) {
d9c66f0b JS	73	error_errno(_("could not read `log` output"));
d9c66f0b JS	74	finish_command(&cp);
2d102c2b	75	goto cleanup;
d9c66f0b	76	}
5189bb87	77	if (finish_command(&cp))
2d102c2b	78	goto cleanup;
d9c66f0b	79
44b67cb6 TG	80	line = contents.buf;
44b67cb6 TG	81	size = contents.len;
47ac23d3	82	for (; size > 0; size -= len, line += len) {
d9c66f0b	83	const char *p;
7c86d365 JK	84	char *eol;
	85
	86	eol = memchr(line, '\n', size);
	87	if (eol) {
	88	*eol = '\0';
	89	len = eol + 1 - line;
	90	} else {
	91	len = size;
	92	}
d9c66f0b	93
44b67cb6	94	if (skip_prefix(line, "commit ", &p)) {
d9c66f0b JS	95	if (util) {
	96	string_list_append(list, buf.buf)->util = util;
	97	strbuf_reset(&buf);
	98	}
ca56dadb	99	CALLOC_ARRAY(util, 1);
d850b7a5	100	if (repo_get_oid(the_repository, p, &util->oid)) {
d9c66f0b	101	error(_("could not parse commit '%s'"), p);
2d102c2b	102	FREE_AND_NULL(util);
d9c66f0b	103	string_list_clear(list, 1);
2d102c2b	104	goto cleanup;
d9c66f0b JS	105	}
	106	util->matching = -1;
	107	in_header = 1;
	108	continue;
	109	}
	110
8cf51561 VD	111	if (!util) {
	112	error(_("could not parse first line of `log` output: "
	113	"did not start with 'commit ': '%s'"),
	114	line);
	115	string_list_clear(list, 1);
2d102c2b	116	goto cleanup;
8cf51561 VD	117	}
8cf51561 VD	118
44b67cb6	119	if (starts_with(line, "diff --git")) {
b66885a3 TG	120	struct patch patch = { 0 };
	121	struct strbuf root = STRBUF_INIT;
	122	int linenr = 0;
8d1675eb	123	int orig_len;
b66885a3	124
d9c66f0b JS	125	in_header = 0;
	126	strbuf_addch(&buf, '\n');
	127	if (!util->diff_offset)
	128	util->diff_offset = buf.len;
7c86d365 JK	129	if (eol)
7c86d365 JK	130	*eol = '\n';
8d1675eb	131	orig_len = len;
937b76ed	132	len = parse_git_diff_header(&root, &linenr, 0, line,
b66885a3	133	len, size, &patch);
a2d474ad JS	134	if (len < 0) {
	135	error(_("could not parse git header '%.*s'"),
	136	orig_len, line);
2d102c2b	137	FREE_AND_NULL(util);
a2d474ad	138	string_list_clear(list, 1);
2d102c2b	139	goto cleanup;
a2d474ad	140	}
b66885a3 TG	141	strbuf_addstr(&buf, " ## ");
	142	if (patch.is_new > 0)
	143	strbuf_addf(&buf, "%s (new)", patch.new_name);
	144	else if (patch.is_delete > 0)
	145	strbuf_addf(&buf, "%s (deleted)", patch.old_name);
	146	else if (patch.is_rename)
	147	strbuf_addf(&buf, "%s => %s", patch.old_name, patch.new_name);
	148	else
	149	strbuf_addstr(&buf, patch.new_name);
	150
444e0969 TG	151	free(current_filename);
	152	if (patch.is_delete > 0)
	153	current_filename = xstrdup(patch.old_name);
	154	else
	155	current_filename = xstrdup(patch.new_name);
	156
b66885a3 TG	157	if (patch.new_mode && patch.old_mode &&
	158	patch.old_mode != patch.new_mode)
	159	strbuf_addf(&buf, " (mode change %06o => %06o)",
	160	patch.old_mode, patch.new_mode);
	161
	162	strbuf_addstr(&buf, " ##");
4998e93f	163	release_patch(&patch);
d9c66f0b	164	} else if (in_header) {
44b67cb6	165	if (starts_with(line, "Author: ")) {
499352c2	166	strbuf_addstr(&buf, " ## Metadata ##\n");
44b67cb6	167	strbuf_addstr(&buf, line);
d9c66f0b	168	strbuf_addstr(&buf, "\n\n");
499352c2	169	strbuf_addstr(&buf, " ## Commit message ##\n");
9f726e1b DL	170	} else if (starts_with(line, "Notes") &&
	171	line[strlen(line) - 1] == ':') {
	172	strbuf_addstr(&buf, "\n\n");
	173	/* strip the trailing colon */
	174	strbuf_addf(&buf, " ## %.*s ##\n",
	175	(int)(strlen(line) - 1), line);
44b67cb6 TG	176	} else if (starts_with(line, " ")) {
	177	p = line + len - 2;
	178	while (isspace(*p) && p >= line)
	179	p--;
	180	strbuf_add(&buf, line, p - line + 1);
d9c66f0b JS	181	strbuf_addch(&buf, '\n');
	182	}
	183	continue;
e1db2630 TG	184	} else if (skip_prefix(line, "@@ ", &p)) {
e1db2630 TG	185	p = strstr(p, "@@");
444e0969 TG	186	strbuf_addstr(&buf, "@@");
	187	if (current_filename && p[2])
	188	strbuf_addf(&buf, " %s:", current_filename);
	189	if (p)
	190	strbuf_addstr(&buf, p + 2);
b66885a3	191	} else if (!line[0])
d9c66f0b JS	192	/*
	193	* A completely blank (not ' \n', which is context)
	194	* line is not valid in a diff. We skip it
	195	* silently, because this neatly handles the blank
	196	* separator line between commits in git-log
	197	* output.
d9c66f0b JS	198	*/
d9c66f0b JS	199	continue;
44b67cb6	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 TG	205	strbuf_addstr(&buf, line + 1);
44b67cb6 TG	206	} else if (line[0] == '#') {
8d5ccb59	207	strbuf_addch(&buf, ' ');
44b67cb6	208	strbuf_addstr(&buf, line + 1);
8d5ccb59	209	} else {
2543a641	210	strbuf_addch(&buf, ' ');
44b67cb6	211	strbuf_addstr(&buf, line);
8d5ccb59	212	}
d9c66f0b JS	213
	214	strbuf_addch(&buf, '\n');
	215	util->diffsize++;
	216	}
2d102c2b ÆAB	217
	218	ret = 0;
	219	cleanup:
44b67cb6	220	strbuf_release(&contents);
d9c66f0b JS	221
	222	if (util)
	223	string_list_append(list, buf.buf)->util = util;
	224	strbuf_release(&buf);
444e0969	225	free(current_filename);
d9c66f0b	226
2d102c2b	227	return ret;
d9c66f0b JS	228	}
d9c66f0b JS	229
5cf88fd8	230	static int patch_util_cmp(const void *cmp_data UNUSED,
02c3c59e JK	231	const struct patch_util *a,
	232	const struct patch_util *b,
	233	const char *keydata)
d9c66f0b JS	234	{
	235	return strcmp(a->diff, keydata ? keydata : b->diff);
	236	}
	237
	238	static void find_exact_matches(struct string_list a, struct string_list b)
	239	{
b19315d8	240	struct hashmap map = HASHMAP_INIT((hashmap_cmp_fn)patch_util_cmp, NULL);
d9c66f0b JS	241	int i;
d9c66f0b JS	242
d9c66f0b JS	243	/* First, add the patches of a to a hash map */
	244	for (i = 0; i < a->nr; i++) {
	245	struct patch_util *util = a->items[i].util;
	246
	247	util->i = i;
	248	util->patch = a->items[i].string;
	249	util->diff = util->patch + util->diff_offset;
d22245a2	250	hashmap_entry_init(&util->e, strhash(util->diff));
b94e5c1d	251	hashmap_add(&map, &util->e);
d9c66f0b JS	252	}
	253
	254	/* Now try to find exact matches in b */
	255	for (i = 0; i < b->nr; i++) {
	256	struct patch_util util = b->items[i].util, other;
	257
	258	util->i = i;
	259	util->patch = b->items[i].string;
	260	util->diff = util->patch + util->diff_offset;
d22245a2	261	hashmap_entry_init(&util->e, strhash(util->diff));
404ab78e	262	other = hashmap_remove_entry(&map, util, e, NULL);
d9c66f0b JS	263	if (other) {
	264	if (other->matching >= 0)
	265	BUG("already assigned!");
	266
	267	other->matching = i;
	268	util->matching = other->i;
	269	}
	270	}
	271
6da1a258	272	hashmap_clear(&map);
d9c66f0b JS	273	}
d9c66f0b JS	274
61bdc7c5 JK	275	static int diffsize_consume(void *data,
	276	char *line UNUSED,
	277	unsigned long len UNUSED)
d9c66f0b JS	278	{
d9c66f0b JS	279	((int )data)++;
a8d5eb6d	280	return 0;
d9c66f0b JS	281	}
d9c66f0b JS	282
61bdc7c5 JK	283	static void diffsize_hunk(void *data,
	284	long ob UNUSED, long on UNUSED,
	285	long nb UNUSED, long nn UNUSED,
	286	const char *func UNUSED, long funclen UNUSED)
d2eb8093 JK	287	{
	288	diffsize_consume(data, NULL, 0);
	289	}
	290
d9c66f0b JS	291	static int diffsize(const char a, const char b)
	292	{
	293	xpparam_t pp = { 0 };
	294	xdemitconf_t cfg = { 0 };
	295	mmfile_t mf1, mf2;
	296	int count = 0;
	297
	298	mf1.ptr = (char *)a;
	299	mf1.size = strlen(a);
	300	mf2.ptr = (char *)b;
	301	mf2.size = strlen(b);
	302
	303	cfg.ctxlen = 3;
d2eb8093 JK	304	if (!xdi_diff_outf(&mf1, &mf2,
	305	diffsize_hunk, diffsize_consume, &count,
	306	&pp, &cfg))
d9c66f0b JS	307	return count;
	308
	309	error(_("failed to generate diff"));
	310	return COST_MAX;
	311	}
	312
	313	static void get_correspondences(struct string_list a, struct string_list b,
	314	int creation_factor)
	315	{
	316	int n = a->nr + b->nr;
	317	int cost, c, a2b, *b2a;
	318	int i, j;
	319
	320	ALLOC_ARRAY(cost, st_mult(n, n));
	321	ALLOC_ARRAY(a2b, n);
	322	ALLOC_ARRAY(b2a, n);
	323
	324	for (i = 0; i < a->nr; i++) {
	325	struct patch_util *a_util = a->items[i].util;
	326
	327	for (j = 0; j < b->nr; j++) {
	328	struct patch_util *b_util = b->items[j].util;
	329
	330	if (a_util->matching == j)
	331	c = 0;
	332	else if (a_util->matching < 0 && b_util->matching < 0)
	333	c = diffsize(a_util->diff, b_util->diff);
	334	else
	335	c = COST_MAX;
	336	cost[i + n * j] = c;
	337	}
	338
	339	c = a_util->matching < 0 ?
	340	a_util->diffsize * creation_factor / 100 : COST_MAX;
	341	for (j = b->nr; j < n; j++)
	342	cost[i + n * j] = c;
	343	}
	344
	345	for (j = 0; j < b->nr; j++) {
	346	struct patch_util *util = b->items[j].util;
	347
	348	c = util->matching < 0 ?
	349	util->diffsize * creation_factor / 100 : COST_MAX;
	350	for (i = a->nr; i < n; i++)
	351	cost[i + n * j] = c;
	352	}
	353
	354	for (i = a->nr; i < n; i++)
	355	for (j = b->nr; j < n; j++)
	356	cost[i + n * j] = 0;
	357
	358	compute_assignment(n, n, cost, a2b, b2a);
	359
	360	for (i = 0; i < a->nr; i++)
	361	if (a2b[i] >= 0 && a2b[i] < b->nr) {
	362	struct patch_util *a_util = a->items[i].util;
	363	struct patch_util *b_util = b->items[a2b[i]].util;
	364
	365	a_util->matching = a2b[i];
	366	b_util->matching = i;
	367	}
	368
	369	free(cost);
	370	free(a2b);
371	free(b2a);
372	}
373
faa1df86	374	static void output_pair_header(struct diff_options *diffopt,
d1f87a2d	375	int patch_no_width,
faa1df86	376	struct strbuf *buf,
eb0be38c JS	377	struct strbuf *dashes,
	378	struct patch_util *a_util,
	379	struct patch_util *b_util)
d9c66f0b	380	{
eb0be38c JS	381	struct object_id *oid = a_util ? &a_util->oid : &b_util->oid;
eb0be38c JS	382	struct commit *commit;
faa1df86 JS	383	char status;
	384	const char *color_reset = diff_get_color_opt(diffopt, DIFF_RESET);
	385	const char *color_old = diff_get_color_opt(diffopt, DIFF_FILE_OLD);
	386	const char *color_new = diff_get_color_opt(diffopt, DIFF_FILE_NEW);
	387	const char *color_commit = diff_get_color_opt(diffopt, DIFF_COMMIT);
	388	const char *color;
d9165bef	389	int abbrev = diffopt->abbrev;
2b15969f TL	390
	391	if (abbrev < 0)
	392	abbrev = DEFAULT_ABBREV;
eb0be38c JS	393
	394	if (!dashes->len)
	395	strbuf_addchars(dashes, '-',
d850b7a5	396	strlen(repo_find_unique_abbrev(the_repository, oid, abbrev)));
eb0be38c	397
faa1df86 JS	398	if (!b_util) {
	399	color = color_old;
	400	status = '<';
	401	} else if (!a_util) {
	402	color = color_new;
	403	status = '>';
	404	} else if (strcmp(a_util->patch, b_util->patch)) {
	405	color = color_commit;
	406	status = '!';
	407	} else {
	408	color = color_commit;
	409	status = '=';
	410	}
	411
eb0be38c	412	strbuf_reset(buf);
faa1df86	413	strbuf_addstr(buf, status == '!' ? color_old : color);
eb0be38c	414	if (!a_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, a_util->i + 1,
d850b7a5	418	repo_find_unique_abbrev(the_repository, &a_util->oid, abbrev));
eb0be38c	419
faa1df86 JS	420	if (status == '!')
	421	strbuf_addf(buf, "%s%s", color_reset, color);
	422	strbuf_addch(buf, status);
	423	if (status == '!')
	424	strbuf_addf(buf, "%s%s", color_reset, color_new);
eb0be38c JS	425
eb0be38c JS	426	if (!b_util)
d1f87a2d	427	strbuf_addf(buf, " %*s: %s", patch_no_width, "-", dashes->buf);
eb0be38c	428	else
d1f87a2d	429	strbuf_addf(buf, " %*d: %s", patch_no_width, b_util->i + 1,
d850b7a5	430	repo_find_unique_abbrev(the_repository, &b_util->oid, abbrev));
eb0be38c JS	431
	432	commit = lookup_commit_reference(the_repository, oid);
	433	if (commit) {
faa1df86 JS	434	if (status == '!')
	435	strbuf_addf(buf, "%s%s", color_reset, color);
	436
eb0be38c JS	437	strbuf_addch(buf, ' ');
	438	pp_commit_easy(CMIT_FMT_ONELINE, commit, buf);
	439	}
faa1df86	440	strbuf_addf(buf, "%s\n", color_reset);
eb0be38c	441
87f1b2d4	442	fwrite(buf->buf, buf->len, 1, diffopt->file);
d9c66f0b JS	443	}
d9c66f0b JS	444
499352c2 TG	445	static struct userdiff_driver section_headers = {
	446	.funcname = { "^ ## (.*) ##$\n"
	447	"^.?@@ (.*)$", REG_EXTENDED }
4eba1fe6 JS	448	};
4eba1fe6 JS	449
c8c5e43a JS	450	static struct diff_filespec get_filespec(const char name, const char *p)
	451	{
	452	struct diff_filespec *spec = alloc_filespec(name);
	453
14228447	454	fill_filespec(spec, null_oid(), 0, 0100644);
c8c5e43a JS	455	spec->data = (char *)p;
	456	spec->size = strlen(p);
	457	spec->should_munmap = 0;
	458	spec->is_stdin = 1;
499352c2	459	spec->driver = &section_headers;
c8c5e43a JS	460
	461	return spec;
	462	}
	463
	464	static void patch_diff(const char a, const char b,
1ca69225	465	struct diff_options *diffopt)
c8c5e43a JS	466	{
	467	diff_queue(&diff_queued_diff,
	468	get_filespec("a", a), get_filespec("b", b));
	469
	470	diffcore_std(diffopt);
	471	diff_flush(diffopt);
	472	}
	473
61bdc7c5	474	static struct strbuf output_prefix_cb(struct diff_options opt UNUSED, void *data)
3e6046ed JS	475	{
	476	return data;
	477	}
	478
c8c5e43a	479	static void output(struct string_list a, struct string_list b,
3e6046ed	480	struct range_diff_options *range_diff_opts)
d9c66f0b	481	{
eb0be38c	482	struct strbuf buf = STRBUF_INIT, dashes = STRBUF_INIT;
d1f87a2d	483	int patch_no_width = decimal_width(1 + (a->nr > b->nr ? a->nr : b->nr));
9dc46e02	484	int i = 0, j = 0;
3e6046ed JS	485	struct diff_options opts;
	486	struct strbuf indent = STRBUF_INIT;
	487
	488	if (range_diff_opts->diffopt)
	489	memcpy(&opts, range_diff_opts->diffopt, sizeof(opts));
	490	else
08539032	491	repo_diff_setup(the_repository, &opts);
3e6046ed	492
709b3f32	493	opts.no_free = 1;
3e6046ed JS	494	if (!opts.output_format)
	495	opts.output_format = DIFF_FORMAT_PATCH;
	496	opts.flags.suppress_diff_headers = 1;
	497	opts.flags.dual_color_diffed_diffs =
	498	range_diff_opts->dual_color;
	499	opts.flags.suppress_hunk_header_line_count = 1;
	500	opts.output_prefix = output_prefix_cb;
	501	strbuf_addstr(&indent, " ");
	502	opts.output_prefix_data = &indent;
	503	diff_setup_done(&opts);
9dc46e02 JS	504
	505	/*
	506	* We assume the user is really more interested in the second argument
	507	* ("newer" version). To that end, we print the output in the order of
	508	* the RHS (the `b` parameter). To put the LHS (the `a` parameter)
	509	* commits that are no longer in the RHS into a good place, we place
	510	* them once we have shown all of their predecessors in the LHS.
	511	*/
	512
	513	while (i < a->nr \|\| j < b->nr) {
	514	struct patch_util a_util, b_util;
	515	a_util = i < a->nr ? a->items[i].util : NULL;
	516	b_util = j < b->nr ? b->items[j].util : NULL;
	517
	518	/* Skip all the already-shown commits from the LHS. */
	519	while (i < a->nr && a_util->shown)
	520	a_util = ++i < a->nr ? a->items[i].util : NULL;
	521
	522	/* Show unmatched LHS commit whose predecessors were shown. */
	523	if (i < a->nr && a_util->matching < 0) {
1e79f973 JS	524	if (!range_diff_opts->right_only)
1e79f973 JS	525	output_pair_header(&opts, patch_no_width,
faa1df86	526	&buf, &dashes, a_util, NULL);
9dc46e02 JS	527	i++;
	528	continue;
	529	}
d9c66f0b	530
9dc46e02 JS	531	/* Show unmatched RHS commits. */
9dc46e02 JS	532	while (j < b->nr && b_util->matching < 0) {
1e79f973 JS	533	if (!range_diff_opts->left_only)
1e79f973 JS	534	output_pair_header(&opts, patch_no_width,
faa1df86	535	&buf, &dashes, NULL, b_util);
9dc46e02	536	b_util = ++j < b->nr ? b->items[j].util : NULL;
d9c66f0b	537	}
d9c66f0b	538
9dc46e02 JS	539	/* Show matching LHS/RHS pair. */
	540	if (j < b->nr) {
	541	a_util = a->items[b_util->matching].util;
3e6046ed	542	output_pair_header(&opts, patch_no_width,
faa1df86	543	&buf, &dashes, a_util, b_util);
3e6046ed	544	if (!(opts.output_format & DIFF_FORMAT_NO_OUTPUT))
c8c5e43a	545	patch_diff(a->items[b_util->matching].string,
3e6046ed	546	b->items[j].string, &opts);
9dc46e02 JS	547	a_util->shown = 1;
	548	j++;
	549	}
d9c66f0b	550	}
eb0be38c JS	551	strbuf_release(&buf);
eb0be38c JS	552	strbuf_release(&dashes);
3e6046ed	553	strbuf_release(&indent);
709b3f32 RS	554	opts.no_free = 0;
709b3f32 RS	555	diff_free(&opts);
73a834e9 ES	556	}
73a834e9 ES	557
d9c66f0b	558	int show_range_diff(const char range1, const char range2,
f1ce6c19	559	struct range_diff_options *range_diff_opts)
d9c66f0b JS	560	{
	561	int res = 0;
	562
	563	struct string_list branch1 = STRING_LIST_INIT_DUP;
	564	struct string_list branch2 = STRING_LIST_INIT_DUP;
	565
1e79f973	566	if (range_diff_opts->left_only && range_diff_opts->right_only)
43ea635c	567	res = error(_("options '%s' and '%s' cannot be used together"), "--left-only", "--right-only");
1e79f973 JS	568
1e79f973 JS	569	if (!res && read_patches(range1, &branch1, range_diff_opts->other_arg))
d9c66f0b	570	res = error(_("could not parse log for '%s'"), range1);
f1ce6c19	571	if (!res && read_patches(range2, &branch2, range_diff_opts->other_arg))
d9c66f0b JS	572	res = error(_("could not parse log for '%s'"), range2);
	573
	574	if (!res) {
	575	find_exact_matches(&branch1, &branch2);
f1ce6c19 JS	576	get_correspondences(&branch1, &branch2,
f1ce6c19 JS	577	range_diff_opts->creation_factor);
3e6046ed	578	output(&branch1, &branch2, range_diff_opts);
d9c66f0b JS	579	}
	580
	581	string_list_clear(&branch1, 1);
	582	string_list_clear(&branch2, 1);
	583
	584	return res;
	585	}
679b5916 JS	586
	587	int is_range_diff_range(const char *arg)
	588	{
359f0d75 JS	589	char copy = xstrdup(arg); / setup_revisions() modifies it */
	590	const char *argv[] = { "", copy, "--", NULL };
	591	int i, positive = 0, negative = 0;
	592	struct rev_info revs;
	593
035c7de9	594	repo_init_revisions(the_repository, &revs, NULL);
359f0d75 JS	595	if (setup_revisions(3, argv, &revs, NULL) == 1) {
	596	for (i = 0; i < revs.pending.nr; i++)
	597	if (revs.pending.objects[i].item->flags & UNINTERESTING)
	598	negative++;
	599	else
	600	positive++;
	601	for (i = 0; i < revs.pending.nr; i++) {
	602	struct object *obj = revs.pending.objects[i].item;
	603
	604	if (obj->type == OBJ_COMMIT)
	605	clear_commit_marks((struct commit *)obj,
	606	ALL_REV_FLAGS);
	607	}
	608	}
	609
	610	free(copy);
1878b5ed	611	release_revisions(&revs);
359f0d75	612	return negative > 0 && positive > 0;
679b5916	613	}