M-x shell, run 'emacs --help', get colorized output... why?

M-x shell, run 'emacs --help', get colorized output... why?

[Steven Thomas]

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I notice that emacs shell-mode colorizes certain strings in the output of a
command you run. For example most (though not all) words starting with - or
-- get colorized. You can see this if you run emacs --help. I don't see this
goofy colorization in term mode or eshell mode.

Can anyone explain what the deal is? A cursory look at the code in shell.el
didn't reveal anything, but I'm sure that somewhere emacs must be deciding
to add colors to the output.

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Re: M-x shell, run 'emacs --help', get colorized output... why?

[Oleksandr Gavenko]

On 17.01.2011 4:11, Steven Thomas wrote:
> I notice that emacs shell-mode colorizes certain strings in the output
> of a command you run. For example most (though not all) words starting
> with - or -- get colorized. You can see this if you run emacs --help. I
> don't see this goofy colorization in term mode or eshell mode.
>
> Can anyone explain what the deal is? A cursory look at the code in
> shell.el didn't reveal anything, but I'm sure that somewhere emacs must
> be deciding to add colors to the output.

term-mode and eshell-mode are mush different from shell-mode.
I can not help you.

Its settings are non common.

I also use

   (ansi-color-for-comint-mode-on)

for 'shell-mode'. This allow correctly see 'ls --color' or 'grep 
--color' output.

Re: M-x shell, run 'emacs --help', get colorized output... why?

[Steven Thomas]

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It turns out shell.el is deliberately doing this, as I expected. The regexps
they use for the matching are in shell-font-lock-keywords. They don't work
that well (e.g. matching "--whatever" in the middle of a line, but not at
the beginning) and I find the colors distracting, so I just disabled the
coloring with (setq shell-font-lock-keywords nil).

On Sun, Jan 16, 2011 at 6:11 PM, Steven Thomas <sthomas314@gmail.com> wrote:

> I notice that emacs shell-mode colorizes certain strings in the output of a
> command you run. For example most (though not all) words starting with - or
> -- get colorized. You can see this if you run emacs --help. I don't see this
> goofy colorization in term mode or eshell mode.
>
> Can anyone explain what the deal is? A cursory look at the code in shell.el
> didn't reveal anything, but I'm sure that somewhere emacs must be deciding
> to add colors to the output.
>

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Re: M-x shell, run 'emacs --help', get colorized output... why?

[PJ Weisberg]

On Fri, Jan 21, 2011 at 5:48 PM, Steven Thomas <sthomas314@gmail.com> wrote:
> They don't work
> that well (e.g. matching "--whatever" in the middle of a line, but not at
> the beginning)

I don't use any of the shells inside Emacs at all (They work
differently from my normal terminal emulator, which is annoying.), but
the above is clearly intentional.  In the middle of a line,
"--whatever" is an option, but at the beginning it's just a command
whose name happens to start with --.

-PJ