cherry-pick: add --action-name option

So it can be used by other tools (e.g. git rebase), and the right action
is passed to the hooks and notes rewrite stuff.

Signed-off-by: Felipe Contreras <felipe.contreras@gmail.com>

builtin/revert.c

@@ -101,6 +101,7 @@ static void parse_args(int argc, const char **argv, struct replay_opts *opts)
 		OPT_END(),
 		OPT_END(),
 		OPT_END(),
+		OPT_END(),
 	};
 
 	if (opts->action == REPLAY_PICK) {
@@ -111,6 +112,7 @@ static void parse_args(int argc, const char **argv, struct replay_opts *opts)
 			OPT_BOOL(0, "allow-empty-message", &opts->allow_empty_message, N_("allow commits with empty messages")),
 			OPT_BOOL(0, "keep-redundant-commits", &opts->keep_redundant_commits, N_("keep redundant, empty commits")),
 			OPT_BOOL(0, "skip-empty", &opts->skip_empty, N_("skip empty commits")),
+			OPT_STRING(0, "action-name", &opts->action_name, N_("name"), N_("action name")),
 			OPT_END(),
 		};
 		if (parse_options_concat(options, ARRAY_SIZE(options), cp_extra))

sequencer.c

@@ -808,6 +808,8 @@ static int populate_opts_cb(const char *key, const char *value, void *data)
 		opts->xopts[opts->xopts_nr++] = xstrdup(value);
 	} else if (!strcmp(key, "options.allow-rerere-auto"))
 		opts->allow_rerere_auto = git_config_int(key, value);
+	else if (!strcmp(key, "options.action-name"))
+		git_config_string(&opts->action_name, key, value);
 	else
 		return error(_("Invalid key: %s"), key);
 
@@ -992,6 +994,8 @@ static void save_opts(struct replay_opts *opts)
 		git_config_set_in_file(opts_file, "options.allow-rerere-auto", buf.buf);
 		strbuf_release(&buf);
 	}
+	if (opts->action_name)
+		git_config_set_in_file(opts_file, "options.action-name", opts->action_name);
 }
 
 static int pick_commits(struct commit_list *todo_list, struct replay_opts *opts)

sequencer.h

@@ -50,6 +50,8 @@ struct replay_opts {
 
 	/* Only used by REPLAY_NONE */
 	struct rev_info *revs;
+
+	const char *action_name;
 };
 
 int sequencer_pick_revisions(struct replay_opts *opts);