[PATCH 09/18] revert: Separate cmdline parsing from functional code

[Ramkumar Ramachandra <artagnon@gmail.com>]

Currently, revert_or_cherry_pick sets up a default git config, parses
command-line arguments, before preparing to pick commits.  This makes
for a bad API as the central worry of callers is to assert whether or
not a conflict occured while cherry picking.  The current API is like:

if (revert_or_cherry_pick(argc, argv, opts) < 0)
   print "Something failed, we're not sure what"

Simplify and rename revert_or_cherry_pick to pick_commits so that it
only has the responsibility of setting up the revision walker and
picking commits in a loop.  Transfer the remaining work to its
callers.  Now, the API is simplified as:

if (parse_args(argc, argv, opts) < 0)
   print "Can't parse arguments"
if (pick_commits(opts) < 0)
   print "Error encountered in picking machinery"

Later in the series, pick_commits will also serve as the starting
point for continuing a cherry-pick or revert.

Inspired-by: Christian Couder <chriscool@tuxfamily.org>
Helped-by: Jonathan Nieder <jrnieder@gmail.com>
Signed-off-by: Ramkumar Ramachandra <artagnon@gmail.com>
---
 builtin/revert.c |   14 +++++++-------
 1 files changed, 7 insertions(+), 7 deletions(-)

diff --git a/builtin/revert.c b/builtin/revert.c
index c118fd3..047b0aa 100644
--- a/builtin/revert.c
+++ b/builtin/revert.c
@@ -558,16 +558,12 @@ static void read_and_refresh_cache(struct replay_opts *opts)
 	rollback_lock_file(&index_lock);
 }
 
-static int revert_or_cherry_pick(int argc, const char **argv,
-				struct replay_opts *opts)
+static int pick_commits(struct replay_opts *opts)
 {
 	struct rev_info revs;
 	struct commit *commit;
 
-	git_config(git_default_config, NULL);
 	setenv(GIT_REFLOG_ACTION, action_name(opts), 0);
-	parse_args(argc, argv, opts);
-
 	if (opts->allow_ff) {
 		if (opts->signoff)
 			die(_("cherry-pick --ff cannot be used with --signoff"));
@@ -601,7 +597,9 @@ int cmd_revert(int argc, const char **argv, const char *prefix)
 	if (isatty(0))
 		opts.edit = 1;
 	opts.action = REVERT;
-	res = revert_or_cherry_pick(argc, argv, &opts);
+	git_config(git_default_config, NULL);
+	parse_args(argc, argv, &opts);
+	res = pick_commits(&opts);
 	if (res < 0)
 		die(_("revert failed"));
 	return res;
@@ -614,7 +612,9 @@ int cmd_cherry_pick(int argc, const char **argv, const char *prefix)
 
 	memset(&opts, 0, sizeof(struct replay_opts));
 	opts.action = CHERRY_PICK;
-	res = revert_or_cherry_pick(argc, argv, &opts);
+	git_config(git_default_config, NULL);
+	parse_args(argc, argv, &opts);
+	res = pick_commits(&opts);
 	if (res < 0)
 		die(_("cherry-pick failed"));
 	return res;
-- 
1.7.4.rc1.7.g2cf08.dirty