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#include "cache.h"
 
/*
 * This is split up from the rest of git so that we might do
 * something different on Windows, for example.
 */
 
static int spawned_pager;
 
static void run_pager(const char *pager)
{
	/*
	 * 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);
 
	execlp(pager, pager, NULL);
	execl("/bin/sh", "sh", "-c", pager, NULL);
}
 
void setup_pager(void)
{
	pid_t pid;
	int fd[2];
	const char *pager = getenv("GIT_PAGER");
 
	if (!isatty(1))
		return;
	if (!pager) {
		if (!pager_program)
			git_config(git_default_config);
		pager = pager_program;
	}
	if (!pager)
		pager = getenv("PAGER");
	if (!pager)
		pager = "less";
	else if (!*pager || !strcmp(pager, "cat"))
		return;
 
	spawned_pager = 1; /* means we are emitting to terminal */
 
	if (pipe(fd) < 0)
		return;
	pid = fork();
	if (pid < 0) {
		close(fd[0]);
		close(fd[1]);
		return;
	}
 
	/* return in the child */
	if (!pid) {
		dup2(fd[1], 1);
		dup2(fd[1], 2);
		close(fd[0]);
		close(fd[1]);
		return;
	}
 
	/* The original process turns into the PAGER */
	dup2(fd[0], 0);
	close(fd[0]);
	close(fd[1]);
 
	setenv("LESS", "FRSX", 0);
	run_pager(pager);
	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;
}