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Commit | Line | Data |
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f67b45f8 LT |
1 | #include "cache.h" |
2 | ||
3 | /* | |
4 | * This is split up from the rest of git so that we might do | |
5 | * something different on Windows, for example. | |
6 | */ | |
7 | ||
402461aa | 8 | static void run_pager(const char *pager) |
f67b45f8 | 9 | { |
402461aa | 10 | execlp(pager, pager, NULL); |
34fd1c9a | 11 | execl("/bin/sh", "sh", "-c", pager, NULL); |
f67b45f8 LT |
12 | } |
13 | ||
14 | void setup_pager(void) | |
15 | { | |
16 | pid_t pid; | |
17 | int fd[2]; | |
c27d205a | 18 | const char *pager = getenv("GIT_PAGER"); |
f67b45f8 LT |
19 | |
20 | if (!isatty(1)) | |
21 | return; | |
c27d205a ML |
22 | if (!pager) |
23 | pager = getenv("PAGER"); | |
402461aa JS |
24 | if (!pager) |
25 | pager = "less"; | |
caef71a5 | 26 | else if (!*pager || !strcmp(pager, "cat")) |
402461aa JS |
27 | return; |
28 | ||
85fb65ed JH |
29 | pager_in_use = 1; /* means we are emitting to terminal */ |
30 | ||
f67b45f8 LT |
31 | if (pipe(fd) < 0) |
32 | return; | |
33 | pid = fork(); | |
34 | if (pid < 0) { | |
35 | close(fd[0]); | |
36 | close(fd[1]); | |
37 | return; | |
38 | } | |
39 | ||
40 | /* return in the child */ | |
41 | if (!pid) { | |
42 | dup2(fd[1], 1); | |
43 | close(fd[0]); | |
44 | close(fd[1]); | |
45 | return; | |
46 | } | |
47 | ||
48 | /* The original process turns into the PAGER */ | |
49 | dup2(fd[0], 0); | |
50 | close(fd[0]); | |
51 | close(fd[1]); | |
52 | ||
cd112cef | 53 | setenv("LESS", "-RS", 0); |
402461aa | 54 | run_pager(pager); |
34fd1c9a | 55 | die("unable to execute pager '%s'", pager); |
f67b45f8 LT |
56 | exit(255); |
57 | } |