Add '--bisect' revision machinery argument

I personally use "git bisect visualize" all the time when I bisect, but it
turns out that that is not a very flexible model. Sometimes I want to do
bisection based on all commits (no pathname limiting), but then visualize
the current bisection tree with just a few pathnames because I _suspect_
those pathnames are involved in the problem but am not totally sure about
them.

And at other times, I want to use other revision parsing logic, none of
which is available with "git bisect visualize".

So this adds "--bisect" as a revision parsing argument, and as a result it
just works with all the normal logging tools. So now I can just do

	gitk --bisect --simplify-by-decoration filename-here

etc.

Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

builtin-rev-list.c

@@ -319,6 +319,8 @@ int cmd_rev_list(int argc, const char **argv, const char *prefix)
 
 	memset(&info, 0, sizeof(info));
 	info.revs = &revs;
+	if (revs.bisect)
+		bisect_list = 1;
 
 	quiet = DIFF_OPT_TST(&revs.diffopt, QUIET);
 	for (i = 1 ; i < argc; i++) {

builtin-rev-parse.c

@@ -180,6 +180,12 @@ static int show_reference(const char *refname, const unsigned char *sha1, int fl
 	return 0;
 }
 
+static int anti_reference(const char *refname, const unsigned char *sha1, int flag, void *cb_data)
+{
+	show_rev(REVERSED, sha1, refname);
+	return 0;
+}
+
 static void show_datestring(const char *flag, const char *datestr)
 {
 	static char buffer[100];
@@ -548,6 +554,11 @@ int cmd_rev_parse(int argc, const char **argv, const char *prefix)
 				for_each_ref(show_reference, NULL);
 				continue;
 			}
+			if (!strcmp(arg, "--bisect")) {
+				for_each_ref_in("refs/bisect/bad", show_reference, NULL);
+				for_each_ref_in("refs/bisect/good", anti_reference, NULL);
+				continue;
+			}
 			if (!strcmp(arg, "--branches")) {
 				for_each_branch_ref(show_reference, NULL);
 				continue;

revision.c

@@ -994,7 +994,8 @@ static int handle_revision_opt(struct rev_info *revs, int argc, const char **arg
 	if (!strcmp(arg, "--all") || !strcmp(arg, "--branches") ||
 	    !strcmp(arg, "--tags") || !strcmp(arg, "--remotes") ||
 	    !strcmp(arg, "--reflog") || !strcmp(arg, "--not") ||
-	    !strcmp(arg, "--no-walk") || !strcmp(arg, "--do-walk"))
+	    !strcmp(arg, "--no-walk") || !strcmp(arg, "--do-walk") ||
+	    !strcmp(arg, "--bisect"))
 	{
 		unkv[(*unkc)++] = arg;
 		return 1;
@@ -1218,6 +1219,16 @@ void parse_revision_opt(struct rev_info *revs, struct parse_opt_ctx_t *ctx,
 	ctx->argc -= n;
 }
 
+static int for_each_bad_bisect_ref(each_ref_fn fn, void *cb_data)
+{
+	return for_each_ref_in("refs/bisect/bad", fn, cb_data);
+}
+
+static int for_each_good_bisect_ref(each_ref_fn fn, void *cb_data)
+{
+	return for_each_ref_in("refs/bisect/good", fn, cb_data);
+}
+
 /*
  * Parse revision information, filling in the "rev_info" structure,
  * and removing the used arguments from the argument list.
@@ -1259,6 +1270,12 @@ int setup_revisions(int argc, const char **argv, struct rev_info *revs, const ch
 				handle_refs(revs, flags, for_each_branch_ref);
 				continue;
 			}
+			if (!strcmp(arg, "--bisect")) {
+				handle_refs(revs, flags, for_each_bad_bisect_ref);
+				handle_refs(revs, flags ^ UNINTERESTING, for_each_good_bisect_ref);
+				revs->bisect = 1;
+				continue;
+			}
 			if (!strcmp(arg, "--tags")) {
 				handle_refs(revs, flags, for_each_tag_ref);
 				continue;

revision.h

@@ -63,6 +63,7 @@ struct rev_info {
 			reverse:1,
 			reverse_output_stage:1,
 			cherry_pick:1,
+			bisect:1,
 			first_parent_only:1;
 
 	/* Diff flags */