revert: allow cherry-picking more than one commit

This makes it possible to pass many commits or ranges of
commits to "git cherry-pick" and to "git revert" to process
many commits instead of just one.

In fact commits are now enumerated with an equivalent of

	git rev-list --no-walk "$@"

so all the following are now possible:

	git cherry-pick master~2..master
	git cherry-pick ^master~2 master
	git cherry-pick master^ master

The following should be possible but does not work:

	git cherry-pick -2 master

because "git rev-list --no-walk -2 master" only outputs
one commit as "--no-walk" seems to take over "-2".

And there is currently no way to continue cherry-picking or
reverting if there is a problem with one commit. It's also
not possible to abort the whole process. Some future work
should provide the --continue and --abort options to do
just that.

Signed-off-by: Christian Couder <chriscool@tuxfamily.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/builtin/revert.c b/builtin/revert.c
index aee10692ba07238ffe11dfdfa06edaf48d829774..853e9e406c7fe258c39fa7e5c53f15f739a935b1 100644 (file)
--- a/builtin/revert.c
+++ b/builtin/revert.c
@@ -39,7 +39,8 @@ static const char * const cherry_pick_usage[] = {
 static int edit, no_replay, no_commit, mainline, signoff, allow_ff;
 static enum { REVERT, CHERRY_PICK } action;
 static struct commit *commit;
-static const char *commit_name;
+static int commit_argc;
+static const char **commit_argv;
 static int allow_rerere_auto;
 
 static const char *me;
@@ -53,7 +54,6 @@ static void parse_args(int argc, const char **argv)
 {
        const char * const * usage_str =
                action == REVERT ?  revert_usage : cherry_pick_usage;
-       unsigned char sha1[20];
        int noop;
        struct option options[] = {
                OPT_BOOLEAN('n', "no-commit", &no_commit, "don't automatically commit"),
@@ -78,15 +78,11 @@ static void parse_args(int argc, const char **argv)
                        die("program error");
        }
 
-       if (parse_options(argc, argv, NULL, options, usage_str, 0) != 1)
+       commit_argc = parse_options(argc, argv, NULL, options, usage_str, 0);
+       if (commit_argc < 1)
                usage_with_options(usage_str, options);
 
-       commit_name = argv[0];
-       if (get_sha1(commit_name, sha1))
-               die ("Cannot find '%s'", commit_name);
-       commit = lookup_commit_reference(sha1);
-       if (!commit)
-               exit(1);
+       commit_argv = argv;
 }
 
 struct commit_message {
@@ -527,8 +523,35 @@ static int do_pick_commit(void)
        return 0;
 }
 
+static void prepare_revs(struct rev_info *revs)
+{
+       int argc = 0;
+       int i;
+       const char **argv = xmalloc((commit_argc + 4) * sizeof(*argv));
+
+       argv[argc++] = NULL;
+       argv[argc++] = "--no-walk";
+       if (action != REVERT)
+               argv[argc++] = "--reverse";
+       for (i = 0; i < commit_argc; i++)
+               argv[argc++] = commit_argv[i];
+       argv[argc++] = NULL;
+
+       init_revisions(revs, NULL);
+       setup_revisions(argc - 1, argv, revs, NULL);
+       if (prepare_revision_walk(revs))
+               die("revision walk setup failed");
+
+       if (!revs->commits)
+               die("empty commit set passed");
+
+       free(argv);
+}
+
 static int revert_or_cherry_pick(int argc, const char **argv)
 {
+       struct rev_info revs;
+
        git_config(git_default_config, NULL);
        me = action == REVERT ? "revert" : "cherry-pick";
        setenv(GIT_REFLOG_ACTION, me, 0);
@@ -548,7 +571,15 @@ static int revert_or_cherry_pick(int argc, const char **argv)
        if (read_cache() < 0)
                die("git %s: failed to read the index", me);
 
-       return do_pick_commit();
+       prepare_revs(&revs);
+
+       while ((commit = get_revision(&revs))) {
+               int res = do_pick_commit();
+               if (res)
+                       return res;
+       }
+
+       return 0;
 }
 
 int cmd_revert(int argc, const char **argv, const char *prefix)