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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 | ||
8 | static int spawned_pager; | |
9 | ||
10 | static void run_pager(const char *pager) | |
11 | { | |
12 | /* | |
13 | * Work around bug in "less" by not starting it until we | |
14 | * have real input | |
15 | */ | |
16 | fd_set in; | |
17 | ||
18 | FD_ZERO(&in); | |
19 | FD_SET(0, &in); | |
20 | select(1, &in, NULL, &in, NULL); | |
21 | ||
22 | execlp(pager, pager, NULL); | |
23 | execl("/bin/sh", "sh", "-c", pager, NULL); | |
24 | } | |
25 | ||
26 | void setup_pager(void) | |
27 | { | |
28 | pid_t pid; | |
29 | int fd[2]; | |
30 | const char *pager = getenv("GIT_PAGER"); | |
31 | ||
32 | if (!isatty(1)) | |
33 | return; | |
34 | if (!pager) { | |
35 | if (!pager_program) | |
36 | git_config(git_default_config); | |
37 | pager = pager_program; | |
38 | } | |
39 | if (!pager) | |
40 | pager = getenv("PAGER"); | |
41 | if (!pager) | |
42 | pager = "less"; | |
43 | else if (!*pager || !strcmp(pager, "cat")) | |
44 | return; | |
45 | ||
46 | spawned_pager = 1; /* means we are emitting to terminal */ | |
47 | ||
48 | if (pipe(fd) < 0) | |
49 | return; | |
50 | pid = fork(); | |
51 | if (pid < 0) { | |
52 | close(fd[0]); | |
53 | close(fd[1]); | |
54 | return; | |
55 | } | |
56 | ||
57 | /* return in the child */ | |
58 | if (!pid) { | |
59 | dup2(fd[1], 1); | |
60 | dup2(fd[1], 2); | |
61 | close(fd[0]); | |
62 | close(fd[1]); | |
63 | return; | |
64 | } | |
65 | ||
66 | /* The original process turns into the PAGER */ | |
67 | dup2(fd[0], 0); | |
68 | close(fd[0]); | |
69 | close(fd[1]); | |
70 | ||
71 | setenv("LESS", "FRSX", 0); | |
72 | run_pager(pager); | |
73 | die("unable to execute pager '%s'", pager); | |
74 | exit(255); | |
75 | } | |
76 | ||
77 | int pager_in_use(void) | |
78 | { | |
79 | const char *env; | |
80 | ||
81 | if (spawned_pager) | |
82 | return 1; | |
83 | ||
84 | env = getenv("GIT_PAGER_IN_USE"); | |
85 | return env ? git_config_bool("GIT_PAGER_IN_USE", env) : 0; | |
86 | } |