Re: ANSI sequences produced on non-ANSI terminal

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On Thu, Sep 23, 2021 at 06:04:20PM -0400, Randall S. Becker wrote:
> On September 23, 2021 5:55 PM, Junio C Hamano wrote:
> >Jeff King <peff@xxxxxxxx> writes:
> >
> >> On Wed, Sep 22, 2021 at 10:21:22PM -0700, The Grey Wolf wrote:
> >>
> >>> Anything else you want to add:
> >>> 	I searched google and the documentation as best I was able for
> >>> 	this, but I am unable to find anywhere that will let me disable
> >>> 	(or enable) colour for a particular term type.  Sometimes I'm on
> >>> 	an xterm, for which this is GREAT.  Sometimes I'm on a Wyse WY60,
> >>> 	for which this is sub-optimal.  My workaround is to disable colour
> >>> 	completely, which is reluctantly acceptable, but it would be nice
> >>> 	to say "If I'm on an xterm/aterm/urxvt/ansi terminal, enable
> >>> 	colour or cursor-positioning, otherwise shut it off."  If this
> >>> 	seems too much of a one-off to handle, fine, but most things that
> >>> 	talk fancy to screens are kind enough to allow an opt-out based on
> >>> 	terminal type. :)
> >>
> >> Git doesn't have any kind of list of terminals, beyond knowing that
> >> "dumb" should disable auto-color. It's possible we could expand that
> >> if there are known terminals that don't understand ANSI colors. I'm a
> >> bit wary of having a laundry list of obscure terminals, though.
> >>
> >> If we built against ncurses or some other terminfo-aware library we
> >> could outsource that, but that would be a new dependency. I'm hesitant
> >> to do that even as an optional dependency given the bang-for-the-buck
> >> (and certainly making it require would be right out).
> >
> >I was wondering if Gray Wolf can run screen on the Wyse, and then wouldn't git see TERM=screen which is pretty much ANSI if I am
> not
> >mistaken ;-)?
> 
> Would something like switch in .gitconfig make a difference? Like core.colourize=false. There are situations where SSH sessions come
> in from automation, like Jenkins and Travis, which sets term to something other than dumb by default. Coloring makes a mess of the
> output. The ability to turn off colouring off by user might be helpful.
> 
> -Randall
> 

That already exists: `color.ui`:

> This variable determines the default value for variables such as
> color.diff and color.grep that control the use of color per command
> family.
> [..]
> Set it to false or never if you prefer Git commands not to use color
> unless enabled explicitly with some other configuration or the --color
> option.

Kevin



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