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revert: Make pick_commits functionally act on a commit list

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Apart from its central objective of calling into the picking
mechanism, pick_commits creates a sequencer directory, prepares a todo
list, and even acts upon the "--reset" subcommand.  This makes for a
bad API since the central worry of callers is to figure out whether or
not any conflicts were encountered during the cherry picking.  The
current API is like:

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

So, change pick_commits so that it's only responsible for picking
commits in a loop and reporting any errors, leaving the rest to a new
function called pick_revisions.  Consequently, the API of pick_commits
becomes much clearer:

  act_on_subcommand(opts->subcommand);
  todo_list = prepare_todo_list();
  if (pick_commits(todo_list, opts) < 0)
     print "Error encountered while picking commits"

Now, callers can easily call-in to the cherry-picking machinery by
constructing an arbitrary todo list along with some options.

Signed-off-by: Ramkumar Ramachandra <artagnon@gmail.com>
Signed-off-by: Jonathan Nieder <jrnieder@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Ramkumar Ramachandra 2011-08-04 16:09:10 +05:30 committed by Junio C Hamano
parent 6f0322633b
commit 21b14778a9
1 changed files with 28 additions and 15 deletions
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43
builtin/revert.c
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@ -727,11 +727,9 @@ static void save_opts(struct replay_opts *opts)
}
}
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;
struct strbuf buf = STRBUF_INIT;
unsigned char sha1[20];
struct commit_list *cur;
int res;
@ -741,16 +739,6 @@ static int pick_commits(struct replay_opts *opts)
opts->record_origin || opts->edit));
read_and_refresh_cache(opts);
walk_revs_populate_todo(&todo_list, opts);
create_seq_dir();
if (get_sha1("HEAD", sha1)) {
if (opts->action == REVERT)
die(_("Can't revert as initial commit"));
die(_("Can't cherry-pick into empty head"));
}
save_head(sha1_to_hex(sha1));
save_opts(opts);
for (cur = todo_list; cur; cur = cur->next) {
save_todo(cur, opts);
res = do_pick_commit(cur->item, opts);
@ -768,6 +756,31 @@ static int pick_commits(struct replay_opts *opts)
return 0;
}
static int pick_revisions(struct replay_opts *opts)
{
struct commit_list *todo_list = NULL;
unsigned char sha1[20];
read_and_refresh_cache(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
*/
walk_revs_populate_todo(&todo_list, opts);
create_seq_dir();
if (get_sha1("HEAD", sha1)) {
if (opts->action == REVERT)
die(_("Can't revert as initial commit"));
die(_("Can't cherry-pick into empty head"));
}
save_head(sha1_to_hex(sha1));
save_opts(opts);
return pick_commits(todo_list, opts);
}
int cmd_revert(int argc, const char **argv, const char *prefix)
{
struct replay_opts opts;
@ -778,7 +791,7 @@ int cmd_revert(int argc, const char **argv, const char *prefix)
opts.action = REVERT;
git_config(git_default_config, NULL);
parse_args(argc, argv, &opts);
return pick_commits(&opts);
return pick_revisions(&opts);
}
int cmd_cherry_pick(int argc, const char **argv, const char *prefix)
@ -789,5 +802,5 @@ int cmd_cherry_pick(int argc, const char **argv, const char *prefix)
opts.action = CHERRY_PICK;
git_config(git_default_config, NULL);
parse_args(argc, argv, &opts);
return pick_commits(&opts);
return pick_revisions(&opts);
}