linux-kernel - Re: [F.A.Q.] the advantages of a shared tool/kernel Git repository, tools/perf/ and tools/kvm/

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Message-ID: <20111109192509.GA22581@psychosis.jim.sh>
Date:	Wed, 9 Nov 2011 14:25:09 -0500
From:	Jim Paris <jim@...n.com>
To:	Arnaldo Carvalho de Melo <acme@...hat.com>
Cc:	Gerd Hoffmann <kraxel@...hat.com>, Ingo Molnar <mingo@...e.hu>,
	Theodore Tso <tytso@....edu>,
	Anthony Liguori <anthony@...emonkey.ws>,
	Pekka Enberg <penberg@...nel.org>,
	Vince Weaver <vince@...ter.net>, Avi Kivity <avi@...hat.com>,
	"kvm@...r.kernel.org list" <kvm@...r.kernel.org>,
	"linux-kernel@...r.kernel.org List" <linux-kernel@...r.kernel.org>,
	qemu-devel Developers <qemu-devel@...gnu.org>,
	Alexander Graf <agraf@...e.de>,
	Blue Swirl <blauwirbel@...il.com>,
	Américo Wang <xiyou.wangcong@...il.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: Re: [F.A.Q.] the advantages of a shared tool/kernel Git
 repository, tools/perf/ and tools/kvm/

Arnaldo Carvalho de Melo wrote:
> Em Wed, Nov 09, 2011 at 11:40:01AM +0100, Gerd Hoffmann escreveu:
> >   Hi,
> > 
> > > What we want to have is to have a set of distinctive colors - just 
> > > two (background, foreground) colors are not enough - we also need 
> > > colors to highlight certain information - we need 5-6 colors for the 
> > > output to be maximally expressive. Is there a canonical way to handle 
> > > that while still adapting to user preferences automatically by taking 
> > > background/foreground color scheme of the xterm into account?
> > 
> > > I suspect to fix the worst of the fallout we could add some logic to 
> > > detect low contrast combinations (too low color distance) and fall 
> > > back to the foreground/background colors in that case.
> > 
> > As far I know it is pretty much impossible to figure the
> > foreground/background colors of the terminal you are running on.  You
> 
> Glad to hear that, I thought I hadn't researched that much (I did). Hope
> somebody appears and tell us how it is done :-)

In xterm, '\e]10;?\e\\' and '\e]11;?\e\\' will report the colors, e.g.:

#!/bin/bash
  read -s -r -d \\ -p `printf '\e]10;?\e\\'` -t 1 fg
  [ $? -ne 0 ] && fg="no response"
  echo "foreground: $fg" | cat -v
  read -s -r -d \\ -p `printf '\e]11;?\e\\'` -t 1 bg
  [ $? -ne 0 ] && bg="no response"
  echo "background: $bg" | cat -v

-jim
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