revision: separate walk and unsorted flags

The `--no-walk` flag supports two modes: either it sorts the revisions
given as input input or it doesn't. This is reflected in a single
`no_walk` flag, which reflects one of the three states "walk", "don't
walk but without sorting" and "don't walk but with sorting".

Split up the flag into two separate bits, one indicating whether we
should walk or not and one indicating whether the input should be sorted
or not. This will allow us to more easily introduce a new flag
`--unsorted-input`, which only impacts the sorting bit.

Signed-off-by: Patrick Steinhardt <ps@pks.im>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

builtin/log.c

@@ -637,7 +637,7 @@ int cmd_show(int argc, const char **argv, const char *prefix)
 	repo_init_revisions(the_repository, &rev, prefix);
 	rev.diff = 1;
 	rev.always_show_header = 1;
-	rev.no_walk = REVISION_WALK_NO_WALK_SORTED;
+	rev.no_walk = 1;
 	rev.diffopt.stat_width = -1; 	/* Scale to real terminal size */
 
 	memset(&opt, 0, sizeof(opt));

builtin/revert.c

@@ -191,7 +191,8 @@ static int run_sequencer(int argc, const char **argv, struct replay_opts *opts)
 		struct setup_revision_opt s_r_opt;
 		opts->revs = xmalloc(sizeof(*opts->revs));
 		repo_init_revisions(the_repository, opts->revs, NULL);
-		opts->revs->no_walk = REVISION_WALK_NO_WALK_UNSORTED;
+		opts->revs->no_walk = 1;
+		opts->revs->unsorted_input = 1;
 		if (argc < 2)
 			usage_with_options(usage_str, options);
 		if (!strcmp(argv[1], "-"))

revision.c

@@ -2651,16 +2651,17 @@ static int handle_revision_pseudo_opt(const char *submodule,
 	} else if (!strcmp(arg, "--not")) {
 		*flags ^= UNINTERESTING | BOTTOM;
 	} else if (!strcmp(arg, "--no-walk")) {
-		revs->no_walk = REVISION_WALK_NO_WALK_SORTED;
+		revs->no_walk = 1;
 	} else if (skip_prefix(arg, "--no-walk=", &optarg)) {
 		/*
 		 * Detached form ("--no-walk X" as opposed to "--no-walk=X")
 		 * not allowed, since the argument is optional.
 		 */
+		revs->no_walk = 1;
 		if (!strcmp(optarg, "sorted"))
-			revs->no_walk = REVISION_WALK_NO_WALK_SORTED;
+			revs->unsorted_input = 0;
 		else if (!strcmp(optarg, "unsorted"))
-			revs->no_walk = REVISION_WALK_NO_WALK_UNSORTED;
+			revs->unsorted_input = 1;
 		else
 			return error("invalid argument to --no-walk");
 	} else if (!strcmp(arg, "--do-walk")) {
@@ -3584,7 +3585,7 @@ int prepare_revision_walk(struct rev_info *revs)
 
 	if (!revs->reflog_info)
 		prepare_to_use_bloom_filter(revs);
-	if (revs->no_walk != REVISION_WALK_NO_WALK_UNSORTED)
+	if (!revs->unsorted_input)
 		commit_list_sort_by_date(&revs->commits);
 	if (revs->no_walk)
 		return 0;

revision.h

@@ -79,10 +79,6 @@ struct rev_cmdline_info {
 	} *rev;
 };
 
-#define REVISION_WALK_WALK 0
-#define REVISION_WALK_NO_WALK_SORTED 1
-#define REVISION_WALK_NO_WALK_UNSORTED 2
-
 struct oidset;
 struct topo_walk_info;
 
@@ -129,7 +125,8 @@ struct rev_info {
 	/* Traversal flags */
 	unsigned int	dense:1,
 			prune:1,
-			no_walk:2,
+			no_walk:1,
+			unsorted_input:1,
 			remove_empty_trees:1,
 			simplify_history:1,
 			show_pulls:1,