[PATCH 13/17] revert: Introduce a layer of indirection over pick_commits

[Ramkumar Ramachandra <artagnon@gmail.com>]

Write a new function called process_subcommand to prepare a todo_list
to call pick_commits with; the job of pick_commits is simplified into
performing the tasks listed in todo_list.  This will be useful when
subcommands like "--reset" and "--continue" are introduced later in
the series.

Helped-by: Jonathan Nieder <jrnider@gmail.com>
Signed-off-by: Ramkumar Ramachandra <artagnon@gmail.com>
---
 builtin/revert.c |   38 ++++++++++++++++++++++++++------------
 1 files changed, 26 insertions(+), 12 deletions(-)

diff --git a/builtin/revert.c b/builtin/revert.c
index edf74fb..f9f5e3a 100644
--- a/builtin/revert.c
+++ b/builtin/revert.c
@@ -976,10 +976,8 @@ static void save_opts(struct replay_opts *opts)
 	strbuf_release(&buf);
 }
 
-static int pick_commits(struct replay_opts *opts)
+static int pick_commits(struct commit_list *todo_list, struct replay_opts *opts)
 {
-	struct commit_list *todo_list = NULL;
-	unsigned char sha1[20];
 	struct commit_list *cur;
 	int res;
 
@@ -989,13 +987,6 @@ static int pick_commits(struct replay_opts *opts)
 				opts->record_origin || opts->edit));
 	read_and_refresh_cache(me, opts);
 
-	walk_revs_populate_todo(&todo_list, opts);
-	create_seq_dir();
-	if (!get_sha1("HEAD", sha1))
-		save_head(sha1_to_hex(sha1));
-	save_opts(opts);
-	save_todo(todo_list, opts);
-
 	for (cur = todo_list; cur; cur = cur->next) {
 		save_todo(cur, opts);
 		res = do_pick_commit(cur->item, opts);
@@ -1011,6 +1002,23 @@ static int pick_commits(struct replay_opts *opts)
 	return 0;
 }
 
+static int process_subcommand(struct replay_opts *opts)
+{
+	struct commit_list *todo_list = NULL;
+	unsigned char sha1[20];
+
+	read_and_refresh_cache(me, opts);
+
+	walk_revs_populate_todo(&todo_list, opts);
+	create_seq_dir();
+	if (!get_sha1("HEAD", sha1))
+		save_head(sha1_to_hex(sha1));
+	save_opts(opts);
+	save_todo(todo_list, opts);
+
+	return pick_commits(todo_list, opts);
+}
+
 int cmd_revert(int argc, const char **argv, const char *prefix)
 {
 	int res;
@@ -1023,7 +1031,13 @@ int cmd_revert(int argc, const char **argv, const char *prefix)
 	git_config(git_default_config, NULL);
 	me = "revert";
 	parse_args(argc, argv, &opts);
-	res = pick_commits(&opts);
+
+	/*
+	 * Decide what to do depending on the arguments; a fresh
+	 * cherry-pick should be handled differently from an existing
+	 * one that is being continued
+	 */
+	res = process_subcommand(&opts);
 	if (res < 0)
 		die(_("revert failed"));
 	return res;
@@ -1039,7 +1053,7 @@ int cmd_cherry_pick(int argc, const char **argv, const char *prefix)
 	git_config(git_default_config, NULL);
 	me = "cherry-pick";
 	parse_args(argc, argv, &opts);
-	res = pick_commits(&opts);
+	res = process_subcommand(&opts);
 	if (res < 0)
 		die(_("cherry-pick failed"));
 	return res;
-- 
1.7.5.GIT