Subject: Re: [RFC PATCH 10/11] rebase: use a common action enum

From: Ævar Arnfjörð Bjarmason <[email-masked]>
Date: Tue, 19 Mar 2019 21:24:28 +0100

On Tue, Mar 19 2019, Phillip Wood wrote:

> From: Phillip Wood <[email-masked]>
>
> cmd_rebase() and cmd_rebase__interactive() used different enums to hold
> the current action. Change to using a common enum so the values are the
> same when we change `rebase -i` to avoid forking `rebase--interactive`.
>
> Signed-off-by: Phillip Wood <[email-masked]>
> ---
>
> Notes:
>     I'm not sure what to do with action_names, I moved it to keep it near
>     the definition of the enum. The extra commands in the enum are not
>     traced so they don't need to be in action_names but it looks odd to
>     leave them out. Also I don't understand why action_names in NULL
>     terminated or the names are marked for translation as it is used in
>     	trace2_cmd_mode(action_names[action]);
>     so we don't use the NULL termination or translate the names (I'd be
>     surprised if we did for tracing)

Making them for translation is a bug in the recent b3a5d5a80c
("trace2:data: add subverb for rebase", 2019-02-22) and just looks like
copy/paste cargo-culting from somewhere else, and likewise with the
trailing NULL which doesn't make sense in this case.

>  builtin/rebase.c | 93 +++++++++++++++++++++++++-----------------------
>  1 file changed, 49 insertions(+), 44 deletions(-)
>
> diff --git a/builtin/rebase.c b/builtin/rebase.c
> index 21ccb6495e..26d25a5242 100644
> --- a/builtin/rebase.c
> +++ b/builtin/rebase.c
> @@ -119,6 +119,30 @@ static struct replay_opts get_replay_opts(const struct rebase_options *opts)
>  	return replay;
>  }
>
> +enum action {
> +	ACTION_NONE = 0,
> +	ACTION_CONTINUE,
> +	ACTION_SKIP,
> +	ACTION_ABORT,
> +	ACTION_QUIT,
> +	ACTION_EDIT_TODO,
> +	ACTION_SHOW_CURRENT_PATCH,
> +	ACTION_SHORTEN_OIDS,
> +	ACTION_EXPAND_OIDS,
> +	ACTION_CHECK_TODO_LIST,
> +	ACTION_REARRANGE_SQUASH,
> +	ACTION_ADD_EXEC
> +};
> +
> +static const char *action_names[] = { N_("undefined"),
> +				      N_("continue"),
> +				      N_("skip"),
> +				      N_("abort"),
> +				      N_("quit"),
> +				      N_("edit_todo"),
> +				      N_("show_current_patch"),
> +				      NULL };
> +
>  static int add_exec_commands(struct string_list *commands)
>  {
>  	const char *todo_file = rebase_path_todo();
> @@ -347,10 +371,7 @@ int cmd_rebase__interactive(int argc, const char **argv, const char *prefix)
>  	unsigned flags = 0;
>  	int abbreviate_commands = 0, ret = 0;
>  	struct object_id squash_onto = null_oid;
> -	enum {
> -		NONE = 0, CONTINUE, SKIP, EDIT_TODO, SHOW_CURRENT_PATCH,
> -		SHORTEN_OIDS, EXPAND_OIDS, CHECK_TODO_LIST, REARRANGE_SQUASH, ADD_EXEC
> -	} command = 0;
> +	enum action command = ACTION_NONE;
>  	struct option options[] = {
>  		OPT_NEGBIT(0, "ff", &opts.flags, N_("allow fast-forward"),
>  			   REBASE_FORCE),
> @@ -367,22 +388,22 @@ int cmd_rebase__interactive(int argc, const char **argv, const char *prefix)
>  			N_("display a diffstat of what changed upstream"),
>  			REBASE_NO_QUIET | REBASE_VERBOSE | REBASE_DIFFSTAT),
>  		OPT_CMDMODE(0, "continue", &command, N_("continue rebase"),
> -			    CONTINUE),
> -		OPT_CMDMODE(0, "skip", &command, N_("skip commit"), SKIP),
> +			    ACTION_CONTINUE),
> +		OPT_CMDMODE(0, "skip", &command, N_("skip commit"), ACTION_SKIP),
>  		OPT_CMDMODE(0, "edit-todo", &command, N_("edit the todo list"),
> -			    EDIT_TODO),
> +			    ACTION_EDIT_TODO),
>  		OPT_CMDMODE(0, "show-current-patch", &command, N_("show the current patch"),
> -			    SHOW_CURRENT_PATCH),
> +			    ACTION_SHOW_CURRENT_PATCH),
>  		OPT_CMDMODE(0, "shorten-ids", &command,
> -			N_("shorten commit ids in the todo list"), SHORTEN_OIDS),
> +			N_("shorten commit ids in the todo list"), ACTION_SHORTEN_OIDS),
>  		OPT_CMDMODE(0, "expand-ids", &command,
> -			N_("expand commit ids in the todo list"), EXPAND_OIDS),
> +			N_("expand commit ids in the todo list"), ACTION_EXPAND_OIDS),
>  		OPT_CMDMODE(0, "check-todo-list", &command,
> -			N_("check the todo list"), CHECK_TODO_LIST),
> +			N_("check the todo list"), ACTION_CHECK_TODO_LIST),
>  		OPT_CMDMODE(0, "rearrange-squash", &command,
> -			N_("rearrange fixup/squash lines"), REARRANGE_SQUASH),
> +			N_("rearrange fixup/squash lines"), ACTION_REARRANGE_SQUASH),
>  		OPT_CMDMODE(0, "add-exec-commands", &command,
> -			N_("insert exec commands in todo list"), ADD_EXEC),
> +			N_("insert exec commands in todo list"), ACTION_ADD_EXEC),
>  		{ OPTION_CALLBACK, 0, "onto", &opts.onto, N_("onto"), N_("onto"),
>  		  PARSE_OPT_NONEG, parse_opt_commit, 0 },
>  		{ OPTION_CALLBACK, 0, "restrict-revision", &opts.restrict_revision,
> @@ -428,36 +449,36 @@ int cmd_rebase__interactive(int argc, const char **argv, const char *prefix)
>  	flags |= abbreviate_commands ? TODO_LIST_ABBREVIATE_CMDS : 0;
>  	flags |= opts.rebase_merges ? TODO_LIST_REBASE_MERGES : 0;
>  	flags |= opts.rebase_cousins > 0 ? TODO_LIST_REBASE_COUSINS : 0;
> -	flags |= command == SHORTEN_OIDS ? TODO_LIST_SHORTEN_IDS : 0;
> +	flags |= command == ACTION_SHORTEN_OIDS ? TODO_LIST_SHORTEN_IDS : 0;
>
>  	if (opts.rebase_cousins >= 0 && !opts.rebase_merges)
>  		warning(_("--[no-]rebase-cousins has no effect without "
>  			  "--rebase-merges"));
>
>  	switch (command) {
> -	case NONE: {
> +	case ACTION_NONE: {
>  		if (!opts.onto && !opts.upstream)
>  			die(_("a base commit must be provided with --upstream or --onto"));
>
>  		ret = do_interactive_rebase(&opts, flags);
>  		break;
>  	}
> -	case SKIP: {
> +	case ACTION_SKIP: {
>  		struct string_list merge_rr = STRING_LIST_INIT_DUP;
>
>  		rerere_clear(the_repository, &merge_rr);
>  	}
>  		/* fallthrough */
> -	case CONTINUE: {
> +	case ACTION_CONTINUE: {
>  		struct replay_opts replay_opts = get_replay_opts(&opts);
>
>  		ret = sequencer_continue(the_repository, &replay_opts);
>  		break;
>  	}
> -	case EDIT_TODO:
> +	case ACTION_EDIT_TODO:
>  		ret = edit_todo_file(flags);
>  		break;
> -	case SHOW_CURRENT_PATCH: {
> +	case ACTION_SHOW_CURRENT_PATCH: {
>  		struct child_process cmd = CHILD_PROCESS_INIT;
>
>  		cmd.git_cmd = 1;
> @@ -466,17 +487,17 @@ int cmd_rebase__interactive(int argc, const char **argv, const char *prefix)
>
>  		break;
>  	}
> -	case SHORTEN_OIDS:
> -	case EXPAND_OIDS:
> +	case ACTION_SHORTEN_OIDS:
> +	case ACTION_EXPAND_OIDS:
>  		ret = transform_todo_file(flags);
>  		break;
> -	case CHECK_TODO_LIST:
> +	case ACTION_CHECK_TODO_LIST:
>  		ret = check_todo_list_from_file(the_repository);
>  		break;
> -	case REARRANGE_SQUASH:
> +	case ACTION_REARRANGE_SQUASH:
>  		ret = rearrange_squash_in_todo_file();
>  		break;
> -	case ADD_EXEC: {
> +	case ACTION_ADD_EXEC: {
>  		struct string_list commands = STRING_LIST_INIT_DUP;
>
>  		split_exec_commands(opts.cmd, &commands);
> @@ -1417,23 +1438,7 @@ int cmd_rebase(int argc, const char **argv, const char *prefix)
>  	struct strbuf revisions = STRBUF_INIT;
>  	struct strbuf buf = STRBUF_INIT;
>  	struct object_id merge_base;
> -	enum {
> -		NO_ACTION,
> -		ACTION_CONTINUE,
> -		ACTION_SKIP,
> -		ACTION_ABORT,
> -		ACTION_QUIT,
> -		ACTION_EDIT_TODO,
> -		ACTION_SHOW_CURRENT_PATCH,
> -	} action = NO_ACTION;
> -	static const char *action_names[] = { N_("undefined"),
> -					      N_("continue"),
> -					      N_("skip"),
> -					      N_("abort"),
> -					      N_("quit"),
> -					      N_("edit_todo"),
> -					      N_("show_current_patch"),
> -					      NULL };
> +	enum action action = ACTION_NONE;
>  	const char *gpg_sign = NULL;
>  	struct string_list exec = STRING_LIST_INIT_NODUP;
>  	const char *rebase_merges = NULL;
> @@ -1600,7 +1605,7 @@ int cmd_rebase(int argc, const char **argv, const char *prefix)
>  			     builtin_rebase_options,
>  			     builtin_rebase_usage, 0);
>
> -	if (action != NO_ACTION && total_argc != 2) {
> +	if (action != ACTION_NONE && total_argc != 2) {
>  		usage_with_options(builtin_rebase_usage,
>  				   builtin_rebase_options);
>  	}
> @@ -1609,7 +1614,7 @@ int cmd_rebase(int argc, const char **argv, const char *prefix)
>  		usage_with_options(builtin_rebase_usage,
>  				   builtin_rebase_options);
>
> -	if (action != NO_ACTION && !in_progress)
> +	if (action != ACTION_NONE && !in_progress)
>  		die(_("No rebase in progress?"));
>  	setenv(GIT_REFLOG_ACTION_ENVIRONMENT, "rebase", 0);
>
> @@ -1709,7 +1714,7 @@ int cmd_rebase(int argc, const char **argv, const char *prefix)
>  		options.action = "show-current-patch";
>  		options.dont_finish_rebase = 1;
>  		goto run_rebase;
> -	case NO_ACTION:
> +	case ACTION_NONE:
>  		break;
>  	default:
>  		BUG("action: %d", action);