Re: [PATCH] pretty: respect color settings for %C placeholders

["René Scharfe" <l.s.r@web.de>]

Am 10.10.2016 um 19:42 schrieb Jeff King:
> On Mon, Oct 10, 2016 at 07:09:12PM +0200, René Scharfe wrote:
>
>>> diff --git a/pretty.c b/pretty.c
>>> index 25efbca..73e58b5 100644
>>> --- a/pretty.c
>>> +++ b/pretty.c
>>> @@ -965,22 +965,31 @@ static size_t parse_color(struct strbuf *sb, /* in UTF-8 */
>>>
>>>  		if (!end)
>>>  			return 0;
>>> -		if (skip_prefix(begin, "auto,", &begin)) {
>>> +
>>> +		if (!skip_prefix(begin, "always,", &begin)) {
>>>  			if (!want_color(c->pretty_ctx->color))
>>>  				return end - placeholder + 1;
>>>  		}
>>
>> Shouldn't we have an "else" here?
>
> I'm not sure what you mean; can you write it out?

 > -		if (skip_prefix(begin, "auto,", &begin)) {
 > +
 > +		if (!skip_prefix(begin, "always,", &begin)) {
 >  			if (!want_color(c->pretty_ctx->color))
 >  				return end - placeholder + 1;
 >  		}

		else {	/* here */

 > +		/* this is a historical noop */
 > +		skip_prefix(begin, "auto,", &begin);

		}

Otherwise "always,auto," would be allowed and mean the same as 
"always,", which just seems wrong.  Not a biggie.

>>> -	if (skip_prefix(placeholder + 1, "red", &rest))
>>> +	if (skip_prefix(placeholder + 1, "red", &rest) &&
>>> +	    want_color(c->pretty_ctx->color))
>>>  		strbuf_addstr(sb, GIT_COLOR_RED);
>>> -	else if (skip_prefix(placeholder + 1, "green", &rest))
>>> +	else if (skip_prefix(placeholder + 1, "green", &rest) &&
>>> +		 want_color(c->pretty_ctx->color))
>>>  		strbuf_addstr(sb, GIT_COLOR_GREEN);
>>> -	else if (skip_prefix(placeholder + 1, "blue", &rest))
>>> +	else if (skip_prefix(placeholder + 1, "blue", &rest) &&
>>> +		 want_color(c->pretty_ctx->color))
>>>  		strbuf_addstr(sb, GIT_COLOR_BLUE);
>>> -	else if (skip_prefix(placeholder + 1, "reset", &rest))
>>> +	else if (skip_prefix(placeholder + 1, "reset", &rest) &&
>>> +		 want_color(c->pretty_ctx->color))
>>>  		strbuf_addstr(sb, GIT_COLOR_RESET);
>>>  	return rest - placeholder;
>>>  }
>>
>> Perhaps it's a funtion like add_color(sb, ctx, color) or similar would be
>> nice?
>
> I actually wrote it that way first (I called it "maybe_add_color()"),
> but it felt a little funny to have a separate function that people might
> be tempted to reuse (the right solution is generally to check
> want_color() early as above, but we can't do that here because we have
> to find the end of each placeholder).

OK.  A variable then?  Lazy pseudo-code:

	if (RED)
		color = red;
	else if (GREEN)
		...

	if (want_color())
		strbuf_addstr(sb, color);

> What I have here is a little funny, too, though, as it keeps trying
> other color names if it finds "red" but want_color() returns 0.

Oh, missed that somehow.. O_o