[PATCH/RFC] Pro-Git thanks, Control-flow bug report

[Steffen Daode Nurpmeso <sdaoden@googlemail.com>]

Hello git(1),

first of all i have to say thanks to the guy who brought up
Pro-Git on this list a few weeks ago!
*Thank you, man*!  I love this book, and i *adore* chapter 9!
Beep beep actually beeping software!  Yes!!
(I hope you do this with adorable software only ...
Such a beep.  Beep.)

So while exploring git(1) i recently tried out colours (it's oh
so coloured for a two, since 2011 three colors vim(1) user -
fascinating) and found a control flow bug:

  ?0%0[steffen@sherwood git.git]$ ./git --version
  git version 1.7.6.233.gd79bc.dirty
  ?0%0[steffen@sherwood git.git]$ ./git -c color.ui=auto -c color.pager=false diff 2> AU; cat AU
  git_config_colorbool(color.ui,auto,-1)
    [pager_in_use(): spawned:0, GIT_PAGER_IN_USE:0]
    auto_color:1
    color acc. 2 getenv(TERM)
  git_default_config(color.pager,false): 0

So the pager is spawned after the color config setting has been
queried (and the latter is never updated).
I'm not aware of the codebase, and so i can't offer a patch,
unfortunately.  I tried the following change in color.c first,
but that's not a solution for the real problem:

  jauto_color:
	if (pager_in_use())
		stdout_is_tty = pager_use_color;
	else if (stdout_is_tty < 0)
		stdout_is_tty = isatty(1);
	if (stdout_is_tty) {
		...

--Steffen
Ciao, sdaoden(*)(gmail.com)
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