1 files changed, 136 insertions, 35 deletions

diff --git a/builtin/log.c b/builtin/log.c
index e094560d9a..061d4fd864 100644
--- a/builtin/log.c
+++ b/builtin/log.c
@@ -31,6 +31,9 @@
 #include "progress.h"
 #include "commit-slab.h"
 #include "repository.h"
+#include "commit-reach.h"
+#include "interdiff.h"
+#include "range-diff.h"
 
 #define MAIL_DEFAULT_WRAP 72
 
@@ -115,7 +118,7 @@ static int log_line_range_callback(const struct option *option, const char *arg,
 
 static void init_log_defaults(void)
 {
-	init_grep_defaults();
+	init_grep_defaults(the_repository);
 	init_diff_ui_defaults();
 
 	decoration_style = auto_decoration_style();
@@ -467,7 +470,7 @@ int cmd_whatchanged(int argc, const char **argv, const char *prefix)
 	init_log_defaults();
 	git_config(git_log_config, NULL);
 
-	init_revisions(&rev, prefix);
+	repo_init_revisions(the_repository, &rev, prefix);
 	rev.diff = 1;
 	rev.simplify_history = 0;
 	memset(&opt, 0, sizeof(opt));
@@ -507,7 +510,8 @@ static int show_blob_object(const struct object_id *oid, struct rev_info *rev, c
 				 &oidc, &obj_context))
 		die(_("Not a valid object name %s"), obj_name);
 	if (!obj_context.path ||
-	    !textconv_object(obj_context.path, obj_context.mode, &oidc, 1, &buf, &size)) {
+	    !textconv_object(the_repository, obj_context.path,
+			     obj_context.mode, &oidc, 1, &buf, &size)) {
 		free(obj_context.path);
 		return stream_blob_to_fd(1, oid, NULL, 0);
 	}
@@ -584,7 +588,7 @@ int cmd_show(int argc, const char **argv, const char *prefix)
 	git_config(git_log_config, NULL);
 
 	memset(&match_all, 0, sizeof(match_all));
-	init_revisions(&rev, prefix);
+	repo_init_revisions(the_repository, &rev, prefix);
 	rev.diff = 1;
 	rev.always_show_header = 1;
 	rev.no_walk = REVISION_WALK_NO_WALK_SORTED;
@@ -664,7 +668,7 @@ int cmd_log_reflog(int argc, const char **argv, const char *prefix)
 	init_log_defaults();
 	git_config(git_log_config, NULL);
 
-	init_revisions(&rev, prefix);
+	repo_init_revisions(the_repository, &rev, prefix);
 	init_reflog_walk(&rev.reflog_info);
 	rev.verbose_header = 1;
 	memset(&opt, 0, sizeof(opt));
@@ -703,7 +707,7 @@ int cmd_log(int argc, const char **argv, const char *prefix)
 	init_log_defaults();
 	git_config(git_log_config, NULL);
 
-	init_revisions(&rev, prefix);
+	repo_init_revisions(the_repository, &rev, prefix);
 	rev.always_show_header = 1;
 	memset(&opt, 0, sizeof(opt));
 	opt.def = "HEAD";
@@ -913,10 +917,10 @@ static void get_patch_ids(struct rev_info *rev, struct patch_ids *ids)
 	if ((flags1 & UNINTERESTING) == (flags2 & UNINTERESTING))
 		die(_("Not a range."));
 
-	init_patch_ids(ids);
+	init_patch_ids(the_repository, ids);
 
 	/* given a range a..b get all patch ids for b..a */
-	init_revisions(&check_rev, rev->prefix);
+	repo_init_revisions(the_repository, &check_rev, rev->prefix);
 	check_rev.max_parents = 1;
 	o1->flags ^= UNINTERESTING;
 	o2->flags ^= UNINTERESTING;
@@ -992,12 +996,32 @@ static char *find_branch_name(struct rev_info *rev)
 	tip_oid = &rev->cmdline.rev[positive].item->oid;
 	if (dwim_ref(ref, strlen(ref), &branch_oid, &full_ref) &&
 	    skip_prefix(full_ref, "refs/heads/", &v) &&
-	    !oidcmp(tip_oid, &branch_oid))
+	    oideq(tip_oid, &branch_oid))
 		branch = xstrdup(v);
 	free(full_ref);
 	return branch;
 }
 
+static void show_diffstat(struct rev_info *rev,
+			  struct commit *origin, struct commit *head)
+{
+	struct diff_options opts;
+
+	memcpy(&opts, &rev->diffopt, sizeof(opts));
+	opts.output_format = DIFF_FORMAT_SUMMARY | DIFF_FORMAT_DIFFSTAT;
+	opts.stat_width = MAIL_DEFAULT_WRAP;
+
+	diff_setup_done(&opts);
+
+	diff_tree_oid(get_commit_tree_oid(origin),
+		      get_commit_tree_oid(head),
+		      "", &opts);
+	diffcore_std(&opts);
+	diff_flush(&opts);
+
+	fprintf(rev->diffopt.file, "\n");
+}
+
 static void make_cover_letter(struct rev_info *rev, int use_stdout,
 			      struct commit *origin,
 			      int nr, struct commit **list,
@@ -1011,7 +1035,6 @@ static void make_cover_letter(struct rev_info *rev, int use_stdout,
 	struct strbuf sb = STRBUF_INIT;
 	int i;
 	const char *encoding = "UTF-8";
-	struct diff_options opts;
 	int need_8bit_cte = 0;
 	struct pretty_print_context pp = {0};
 	struct commit *head = list[0];
@@ -1061,25 +1084,20 @@ static void make_cover_letter(struct rev_info *rev, int use_stdout,
 
 	shortlog_output(&log);
 
-	/*
-	 * We can only do diffstat with a unique reference point
-	 */
-	if (!origin)
-		return;
-
-	memcpy(&opts, &rev->diffopt, sizeof(opts));
-	opts.output_format = DIFF_FORMAT_SUMMARY | DIFF_FORMAT_DIFFSTAT;
-	opts.stat_width = MAIL_DEFAULT_WRAP;
+	/* We can only do diffstat with a unique reference point */
+	if (origin)
+		show_diffstat(rev, origin, head);
 
-	diff_setup_done(&opts);
-
-	diff_tree_oid(get_commit_tree_oid(origin),
-		      get_commit_tree_oid(head),
-		      "", &opts);
-	diffcore_std(&opts);
-	diff_flush(&opts);
+	if (rev->idiff_oid1) {
+		fprintf_ln(rev->diffopt.file, "%s", rev->idiff_title);
+		show_interdiff(rev, 0);
+	}
 
-	fprintf(rev->diffopt.file, "\n");
+	if (rev->rdiff1) {
+		fprintf_ln(rev->diffopt.file, "%s", rev->rdiff_title);
+		show_range_diff(rev->rdiff1, rev->rdiff2,
+				rev->creation_factor, 1, &rev->diffopt);
+	}
 }
 
 static const char *clean_message_id(const char *msg_id)
@@ -1360,13 +1378,13 @@ static void prepare_bases(struct base_tree_info *bases,
 		return;
 
 	init_commit_base(&commit_base);
-	diff_setup(&diffopt);
+	repo_diff_setup(the_repository, &diffopt);
 	diffopt.flags.recursive = 1;
 	diff_setup_done(&diffopt);
 
 	oidcpy(&bases->base_commit, &base->object.oid);
 
-	init_revisions(&revs, NULL);
+	repo_init_revisions(the_repository, &revs, NULL);
 	revs.max_parents = 1;
 	revs.topo_order = 1;
 	for (i = 0; i < total; i++) {
@@ -1419,6 +1437,36 @@ static void print_bases(struct base_tree_info *bases, FILE *file)
 	oidclr(&bases->base_commit);
 }
 
+static const char *diff_title(struct strbuf *sb, int reroll_count,
+		       const char *generic, const char *rerolled)
+{
+	if (reroll_count <= 0)
+		strbuf_addstr(sb, generic);
+	else /* RFC may be v0, so allow -v1 to diff against v0 */
+		strbuf_addf(sb, rerolled, reroll_count - 1);
+	return sb->buf;
+}
+
+static void infer_range_diff_ranges(struct strbuf *r1,
+				    struct strbuf *r2,
+				    const char *prev,
+				    struct commit *origin,
+				    struct commit *head)
+{
+	const char *head_oid = oid_to_hex(&head->object.oid);
+
+	if (!strstr(prev, "..")) {
+		strbuf_addf(r1, "%s..%s", head_oid, prev);
+		strbuf_addf(r2, "%s..%s", prev, head_oid);
+	} else if (!origin) {
+		die(_("failed to infer range-diff ranges"));
+	} else {
+		strbuf_addstr(r1, prev);
+		strbuf_addf(r2, "%s..%s",
+			    oid_to_hex(&origin->object.oid), head_oid);
+	}
+}
+
 int cmd_format_patch(int argc, const char **argv, const char *prefix)
 {
 	struct commit *commit;
@@ -1446,6 +1494,13 @@ int cmd_format_patch(int argc, const char **argv, const char *prefix)
 	struct base_tree_info bases;
 	int show_progress = 0;
 	struct progress *progress = NULL;
+	struct oid_array idiff_prev = OID_ARRAY_INIT;
+	struct strbuf idiff_title = STRBUF_INIT;
+	const char *rdiff_prev = NULL;
+	struct strbuf rdiff1 = STRBUF_INIT;
+	struct strbuf rdiff2 = STRBUF_INIT;
+	struct strbuf rdiff_title = STRBUF_INIT;
+	int creation_factor = -1;
 
 	const struct option builtin_format_patch_options[] = {
 		{ OPTION_CALLBACK, 'n', "numbered", &numbered, NULL,
@@ -1519,6 +1574,13 @@ int cmd_format_patch(int argc, const char **argv, const char *prefix)
 		OPT__QUIET(&quiet, N_("don't print the patch filenames")),
 		OPT_BOOL(0, "progress", &show_progress,
 			 N_("show progress while generating patches")),
+		OPT_CALLBACK(0, "interdiff", &idiff_prev, N_("rev"),
+			     N_("show changes against <rev> in cover letter or single patch"),
+			     parse_opt_object_name),
+		OPT_STRING(0, "range-diff", &rdiff_prev, N_("refspec"),
+			   N_("show changes against <refspec> in cover letter or single patch")),
+		OPT_INTEGER(0, "creation-factor", &creation_factor,
+			    N_("percentage by which creation is weighted")),
 		OPT_END()
 	};
 
@@ -1527,7 +1589,7 @@ int cmd_format_patch(int argc, const char **argv, const char *prefix)
 	extra_cc.strdup_strings = 1;
 	init_log_defaults();
 	git_config(git_format_config, NULL);
-	init_revisions(&rev, prefix);
+	repo_init_revisions(the_repository, &rev, prefix);
 	rev.commit_format = CMIT_FMT_EMAIL;
 	rev.expand_tabs_in_log_default = 0;
 	rev.verbose_header = 1;
@@ -1703,8 +1765,8 @@ int cmd_format_patch(int argc, const char **argv, const char *prefix)
 		/* Don't say anything if head and upstream are the same. */
 		if (rev.pending.nr == 2) {
 			struct object_array_entry *o = rev.pending.objects;
-			if (oidcmp(&o[0].item->oid, &o[1].item->oid) == 0)
-				return 0;
+			if (oideq(&o[0].item->oid, &o[1].item->oid))
+				goto done;
 		}
 		get_patch_ids(&rev, &ids);
 	}
@@ -1728,7 +1790,7 @@ int cmd_format_patch(int argc, const char **argv, const char *prefix)
 	}
 	if (nr == 0)
 		/* nothing to do */
-		return 0;
+		goto done;
 	total = nr;
 	if (cover_letter == -1) {
 		if (config_cover_letter == COVER_AUTO)
@@ -1741,6 +1803,35 @@ int cmd_format_patch(int argc, const char **argv, const char *prefix)
 	if (numbered)
 		rev.total = total + start_number - 1;
 
+	if (idiff_prev.nr) {
+		if (!cover_letter && total != 1)
+			die(_("--interdiff requires --cover-letter or single patch"));
+		rev.idiff_oid1 = &idiff_prev.oid[idiff_prev.nr - 1];
+		rev.idiff_oid2 = get_commit_tree_oid(list[0]);
+		rev.idiff_title = diff_title(&idiff_title, reroll_count,
+					     _("Interdiff:"),
+					     _("Interdiff against v%d:"));
+	}
+
+	if (creation_factor < 0)
+		creation_factor = RANGE_DIFF_CREATION_FACTOR_DEFAULT;
+	else if (!rdiff_prev)
+		die(_("--creation-factor requires --range-diff"));
+
+	if (rdiff_prev) {
+		if (!cover_letter && total != 1)
+			die(_("--range-diff requires --cover-letter or single patch"));
+
+		infer_range_diff_ranges(&rdiff1, &rdiff2, rdiff_prev,
+					origin, list[0]);
+		rev.rdiff1 = rdiff1.buf;
+		rev.rdiff2 = rdiff2.buf;
+		rev.creation_factor = creation_factor;
+		rev.rdiff_title = diff_title(&rdiff_title, reroll_count,
+					     _("Range-diff:"),
+					     _("Range-diff against v%d:"));
+	}
+
 	if (!signature) {
 		; /* --no-signature inhibits all signatures */
 	} else if (signature && signature != git_version_string) {
@@ -1778,6 +1869,9 @@ int cmd_format_patch(int argc, const char **argv, const char *prefix)
 		print_signature(rev.diffopt.file);
 		total++;
 		start_number--;
+		/* interdiff/range-diff in cover-letter; omit from patches */
+		rev.idiff_oid1 = NULL;
+		rev.rdiff1 = NULL;
 	}
 	rev.add_signoff = do_signoff;
 
@@ -1858,6 +1952,13 @@ int cmd_format_patch(int argc, const char **argv, const char *prefix)
 	string_list_clear(&extra_hdr, 0);
 	if (ignore_if_in_upstream)
 		free_patch_ids(&ids);
+
+done:
+	oid_array_clear(&idiff_prev);
+	strbuf_release(&idiff_title);
+	strbuf_release(&rdiff1);
+	strbuf_release(&rdiff2);
+	strbuf_release(&rdiff_title);
 	return 0;
 }
 
@@ -1938,7 +2039,7 @@ int cmd_cherry(int argc, const char **argv, const char *prefix)
 		}
 	}
 
-	init_revisions(&revs, prefix);
+	repo_init_revisions(the_repository, &revs, prefix);
 	revs.max_parents = 1;
 
 	if (add_pending_commit(head, &revs, 0))
@@ -1949,7 +2050,7 @@ int cmd_cherry(int argc, const char **argv, const char *prefix)
 	/* Don't say anything if head and upstream are the same. */
 	if (revs.pending.nr == 2) {
 		struct object_array_entry *o = revs.pending.objects;
-		if (oidcmp(&o[0].item->oid, &o[1].item->oid) == 0)
+		if (oideq(&o[0].item->oid, &o[1].item->oid))
 			return 0;
 	}