Re: [PATCH] chainlint: colorize problem annotations and test delimiters

[Eric Sunshine <sunshine@sunshineco.com>]

On Mon, Sep 12, 2022 at 8:15 PM Jeff King <peff@peff.net> wrote:
> On Mon, Sep 12, 2022 at 11:04:48PM +0000, Eric Sunshine via GitGitGadget wrote:
> > +my @NOCOLORS = (bold => '', reset => '', blue => '', green => '', red => '');
> > +my %COLORS = ();
> > +sub get_colors {
> > +     return \%COLORS if %COLORS;
> > +     if (exists($ENV{NO_COLOR}) ||
> > +         system("tput sgr0 >/dev/null 2>&1") != 0 ||
> > +         system("tput bold >/dev/null 2>&1") != 0 ||
> > +         system("tput setaf 1 >/dev/null 2>&1") != 0) {
> > +             %COLORS = @NOCOLORS;
> > +             return \%COLORS;
> > +     }
> > +     %COLORS = (bold  => `tput bold`,
> > +                reset => `tput sgr0`,
> > +                blue  => `tput setaf 4`,
> > +                green => `tput setaf 2`,
> > +                red   => `tput setaf 1`);
> > +     chomp(%COLORS);
> > +     return \%COLORS;
> > +}
>
> This is a lot of new processes. Should be OK in the run-once-for-all-tests
> mode. It does make me wonder how much time regular test-lib.sh spends
> doing these tput checks for every script (at least it's not every
> snippet!).

This is indeed a lot of new processes, but this color interrogation is
done lazily, only if a problem is detected, so it should be zero-cost
in the (hopefully) normal case of a lint-clean script.

I had the exact same thought about the cost being paid by test-lib.sh
making all those `tput` invocations.

> It feels like we could build a color.sh snippet once and then include it
> in each script. But maybe that is dumb, since you could in theory build
> in one terminal and then run in another. Unlikely, but it shows that
> file dependencies are a mismatch. I guess a better match would be
> stuffing it into the environment before starting all of the tests.

That might be worth considering at some point.

> I ran this on my pre-fixup state where I had a half-dozen linter checks.
> It's _so_ much more readable. Thanks for working on it.

Good to hear.