Function handle_alias

git.c:368–464

}

static int handle_alias(struct strvec *args, struct string_list *expanded_aliases)
{
	int envchanged = 0, ret = 0, saved_errno = errno;
	int count, option_count;
	const char **new_argv;
	const char *alias_command;
	char *alias_string;

	alias_command = args->v[0];
	alias_string = alias_lookup(alias_command);
	if (alias_string) {
		struct string_list_item *seen;

		if (args->nr == 2 && !strcmp(args->v[1], "-h"))
			fprintf_ln(stderr, _("'%s' is aliased to '%s'"),
				   alias_command, alias_string);
		if (alias_string[0] == '!') {
			struct child_process child = CHILD_PROCESS_INIT;
			int nongit_ok;

			/* Aliases expect GIT_PREFIX, GIT_DIR etc to be set */
			setup_git_directory_gently(the_repository, &nongit_ok);

			commit_pager_choice();

			child.use_shell = 1;
			child.clean_on_exit = 1;
			child.wait_after_clean = 1;
			child.trace2_child_class = "shell_alias";
			strvec_push(&child.args, alias_string + 1);
			strvec_pushv(&child.args, args->v + 1);

			trace2_cmd_alias(alias_command, child.args.v);
			trace2_cmd_name("_run_shell_alias_");

			ret = run_command(&child);
			if (ret >= 0)   /* normal exit */
				exit(ret);

			die_errno(_("while expanding alias '%s': '%s'"),
				  alias_command, alias_string + 1);
		}
		count = split_cmdline(alias_string, &new_argv);
		if (count < 0)
			die(_("bad alias.%s string: %s"), alias_command,
			    _(split_cmdline_strerror(count)));
		option_count = handle_options(&new_argv, &count, &envchanged);
		if (envchanged)
			die(_("alias '%s' changes environment variables.\n"
			      "You can use '!git' in the alias to do this"),
			    alias_command);
		MOVE_ARRAY(new_argv - option_count, new_argv, count);
		new_argv -= option_count;

		if (count < 1)
			die(_("empty alias for %s"), alias_command);

		if (!strcmp(alias_command, new_argv[0]))