summaryrefslogtreecommitdiff
path: root/pager.c
blob: 8bd33a15ca50f01b3c5a5e4028dc0b64d5360a92 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
#include "cache.h"

/*
 * This is split up from the rest of git so that we might do
 * something different on Windows, for example.
 */

static void run_pager(const char *pager)
{
	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)
		pager = getenv("PAGER");
	if (!pager)
		pager = "less";
	else if (!*pager || !strcmp(pager, "cat"))
		return;

	pager_in_use = 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);
		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", "FRS", 0);
	run_pager(pager);
	die("unable to execute pager '%s'", pager);
	exit(255);
}