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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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2
cache.h
View File

@ -608,7 +608,7 @@ extern int write_or_whine_pipe(int fd, const void *buf, size_t count, const char
/* pager.c */
extern void setup_pager(void);
extern char *pager_program;
extern int pager_in_use;
extern int pager_in_use(void);
extern int pager_use_color;
extern char *editor_program;

2
color.c
View File

@ -135,7 +135,7 @@ int git_config_colorbool(const char *var, const char *value, int stdout_is_tty)
auto_color:
if (stdout_is_tty < 0)
stdout_is_tty = isatty(1);
if (stdout_is_tty || (pager_in_use && pager_use_color)) {
if (stdout_is_tty || (pager_in_use() && pager_use_color)) {
char *term = getenv("TERM");
if (term && strcmp(term, "dumb"))
return 1;

1
environment.c
View File

@ -31,7 +31,6 @@ size_t packed_git_window_size = DEFAULT_PACKED_GIT_WINDOW_SIZE;
size_t packed_git_limit = DEFAULT_PACKED_GIT_LIMIT;
size_t delta_base_cache_limit = 16 * 1024 * 1024;
char *pager_program;
int pager_in_use;
int pager_use_color = 1;
char *editor_program;
char *excludes_file;

15
pager.c
View File

@ -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;
}