report default colors

Hi, 

My good friends, I would like a way to report all colors, default and configured, used by git.  

I can report configured colors, 

$ git config --get-regexp color color.diff.meta black bold color.diff.frag magenta bold color.diff.old red bold color.diff.new blue bold

which is not terribly useful, because those values came from a file I control.  

I can get a list of all keys from "git help", which is something.  But I'm left guessing at which keys control the text on the screen for a given command, and what color they are.  

In the instant case, "git push" was rejected, and the reason is impossible to read because it's in yellow on a light blue background.  (Don't get me started on the pointlessly difficult antiquated arcane color control of ANSI terminals.)  My workaround is to guess what it probably says (probably it says I need to pull).  When that doesn't work, I copy and paste the text into emacs.  

What I would like to do is identify every color git is using for every purpose.  That would let me change, say, all yellow to yellow-on-black.  But I have no way to discover what shows up in yellow, other than intuition.  

Thank you for your kind consideration of my suggestion.  

--jkl

James Lowden <james.k.lowden@icloud.com> writes:

Interesting. I wonder where you are getting the yellow from. The hardcoded default comes from these in builtin/push.c

    static int push_use_color = -1;
    static char push_colors[][COLOR_MAXLEN] = {
            GIT_COLOR_RESET,
            GIT_COLOR_RED,	/* ERROR */
    };

    enum color_push {
            PUSH_COLOR_RESET = 0,
            PUSH_COLOR_ERROR = 1
    };

and the push_colors[PUSH_COLOR_ERROR][] is used here

	...
	if (err != 0) {
		fprintf(stderr, "%s", push_get_color(PUSH_COLOR_ERROR));
		error(_("failed to push some refs to '%s'"), anon_url);
		fprintf(stderr, "%s", push_get_color(PUSH_COLOR_RESET));
	}

so I wouldn't be surprised if you see this painted in red, but yellow?

In any case, there are two things _we_ should do on our end.

One obviously is to document the default when we document configurables (e.g. color.push.error only says "Use customized color for push errors", but it should say by default it uses red).

The other is about this part:

No color is well recognizable on all backgrounds, and people use different background, so we need to make sure that our coding guidelines tell our developers (1) not to use unusual colors for common things, and/or (2) make both foreground and background configurable.

(1) is because if we stick to small number of common colors, it would make it easier for users to find and use a single background that works well with these colors.

(2) is because there will be some users who find whatever common default colors we use not working for them. They may need higher contrast between background and foreground, and allowing both be tweakable would make it easier for them to find the color pairs that work well.

Thanks.