mirror of
https://github.com/git/git.git
synced 2024-12-15 12:53:36 +08:00
2e6c012e10
We have always set a global "spawned_pager" variable when we start the pager. This lets us make the auto-color decision later in the program as as "we are outputting to a terminal, or to a pager which can handle colors". Commit6e9af86added support for the GIT_PAGER_IN_USE environment variable. An external program calling git (e.g., git-svn) could set this variable to indicate that it had already started the pager, and that the decision about auto-coloring should take that into account. However,6e9af86failed to do the reverse, which is to tell external programs when git itself has started the pager. Thus a git command implemented as an external script that has the pager turned on (e.g., "git -p stash show") would not realize it was going to a pager, and would suppress colors. This patch remedies that; we always set GIT_PAGER_IN_USE when we start the pager, and the value is respected by both this program and any spawned children. Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
113 lines
2.1 KiB
C
113 lines
2.1 KiB
C
#include "cache.h"
|
|
#include "run-command.h"
|
|
#include "sigchain.h"
|
|
|
|
#ifndef DEFAULT_PAGER
|
|
#define DEFAULT_PAGER "less"
|
|
#endif
|
|
|
|
/*
|
|
* This is split up from the rest of git so that we can do
|
|
* something different on Windows.
|
|
*/
|
|
|
|
#ifndef WIN32
|
|
static void pager_preexec(void)
|
|
{
|
|
/*
|
|
* Work around bug in "less" by not starting it until we
|
|
* have real input
|
|
*/
|
|
fd_set in;
|
|
|
|
FD_ZERO(&in);
|
|
FD_SET(0, &in);
|
|
select(1, &in, NULL, &in, NULL);
|
|
}
|
|
#endif
|
|
|
|
static const char *pager_argv[] = { NULL, NULL };
|
|
static struct child_process pager_process;
|
|
|
|
static void wait_for_pager(void)
|
|
{
|
|
fflush(stdout);
|
|
fflush(stderr);
|
|
/* signal EOF to pager */
|
|
close(1);
|
|
close(2);
|
|
finish_command(&pager_process);
|
|
}
|
|
|
|
static void wait_for_pager_signal(int signo)
|
|
{
|
|
wait_for_pager();
|
|
sigchain_pop(signo);
|
|
raise(signo);
|
|
}
|
|
|
|
const char *git_pager(int stdout_is_tty)
|
|
{
|
|
const char *pager;
|
|
|
|
if (!stdout_is_tty)
|
|
return NULL;
|
|
|
|
pager = getenv("GIT_PAGER");
|
|
if (!pager) {
|
|
if (!pager_program)
|
|
git_config(git_default_config, NULL);
|
|
pager = pager_program;
|
|
}
|
|
if (!pager)
|
|
pager = getenv("PAGER");
|
|
if (!pager)
|
|
pager = DEFAULT_PAGER;
|
|
else if (!*pager || !strcmp(pager, "cat"))
|
|
pager = NULL;
|
|
|
|
return pager;
|
|
}
|
|
|
|
void setup_pager(void)
|
|
{
|
|
const char *pager = git_pager(isatty(1));
|
|
|
|
if (!pager)
|
|
return;
|
|
|
|
setenv("GIT_PAGER_IN_USE", "true", 1);
|
|
|
|
/* spawn the pager */
|
|
pager_argv[0] = pager;
|
|
pager_process.use_shell = 1;
|
|
pager_process.argv = pager_argv;
|
|
pager_process.in = -1;
|
|
if (!getenv("LESS")) {
|
|
static const char *env[] = { "LESS=FRSX", NULL };
|
|
pager_process.env = env;
|
|
}
|
|
#ifndef WIN32
|
|
pager_process.preexec_cb = pager_preexec;
|
|
#endif
|
|
if (start_command(&pager_process))
|
|
return;
|
|
|
|
/* original process continues, but writes to the pipe */
|
|
dup2(pager_process.in, 1);
|
|
if (isatty(2))
|
|
dup2(pager_process.in, 2);
|
|
close(pager_process.in);
|
|
|
|
/* this makes sure that the parent terminates after the pager */
|
|
sigchain_push_common(wait_for_pager_signal);
|
|
atexit(wait_for_pager);
|
|
}
|
|
|
|
int pager_in_use(void)
|
|
{
|
|
const char *env;
|
|
env = getenv("GIT_PAGER_IN_USE");
|
|
return env ? git_config_bool("GIT_PAGER_IN_USE", env) : 0;
|
|
}
|