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Support GIT_PAGER_IN_USE environment variable

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When deciding whether or not to turn on automatic color
support, git_config_colorbool checks whether stdout is a
tty. However, because we run a pager, if stdout is not a
tty, we must check whether it is because we started the
pager. This used to be done by checking the pager_in_use
variable.

This variable was set only when the git program being run
started the pager; there was no way for an external program
running git indicate that it had already started a pager.
This patch allows a program to set GIT_PAGER_IN_USE to a
true value to indicate that even though stdout is not a tty,
it is because a pager is being used.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Jeff King
2007-12-11 01:27:33 -05:00
committed by Junio C Hamano
parent 591aa2536f
commit 6e9af863ee
4 changed files with 16 additions and 4 deletions
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15
pager.c
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@ -5,6 +5,8 @@
* something different on Windows, for example.
*/
static int spawned_pager;
static void run_pager(const char *pager)
{
/*
@ -41,7 +43,7 @@ void setup_pager(void)
else if (!*pager || !strcmp(pager, "cat"))
return;
pager_in_use = 1; /* means we are emitting to terminal */
spawned_pager = 1; /* means we are emitting to terminal */
if (pipe(fd) < 0)
return;
@ -70,3 +72,14 @@ void setup_pager(void)
die("unable to execute pager '%s'", pager);
exit(255);
}
int pager_in_use(void)
{
const char *env;
if (spawned_pager)
return 1;
env = getenv("GIT_PAGER_IN_USE");
return env ? git_config_bool("GIT_PAGER_IN_USE", env) : 0;
}