Re: [PATCH v2 1/3] pretty: add conditional %C?colorname placeholders

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Hi Will,

Will Palmer wrote:

> Here we add the %C?colorname placeholders which act just as the
> %Ccolorname placeholders, with the exception that the pretty_context is
> checked to see if color should be used according to configuration

Thanks for tackling this.

I have thought a little about a related problem: some commands have
configuration for the colors they use, like:

    color.grep.<slot>
        Use customized color for grep colorization.  <slot> specifies which
        part of the line to use the specified color, and is one of

        context
            non-matching text in context lines (when using -A, -B, or -C)

        filename
            filename prefix (when not using -h)

This is nice because in certain situations (e.g. different background
colors), the default colors might not be suitable.  As an example of
this, the ‘commit ’ line of ‘git log’ output uses color.diff.commit.

So it would be nice to be able to use %C(diff.commit) and
automatically use the right color, if color is enabled.

Why not make %C always check?  I can understand that it would be
annoying when first trying to use %C.  On the other hand, it would be
more convenient for writing format.pretty configuration that should be
shared with old git, and I assume anyone using %C for the first time
would be looking at the manual, which could warn her.

Cheers,
Jonathan
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