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Commit | Line | Data |
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f67b45f8 | 1 | #include "cache.h" |
ea27a18c | 2 | #include "run-command.h" |
f67b45f8 LT |
3 | |
4 | /* | |
bfdd9ffd JS |
5 | * This is split up from the rest of git so that we can do |
6 | * something different on Windows. | |
f67b45f8 LT |
7 | */ |
8 | ||
6e9af863 JK |
9 | static int spawned_pager; |
10 | ||
bfdd9ffd | 11 | #ifndef __MINGW32__ |
ea27a18c | 12 | static void pager_preexec(void) |
f67b45f8 | 13 | { |
35ce8622 LT |
14 | /* |
15 | * Work around bug in "less" by not starting it until we | |
16 | * have real input | |
17 | */ | |
18 | fd_set in; | |
19 | ||
20 | FD_ZERO(&in); | |
21 | FD_SET(0, &in); | |
22 | select(1, &in, NULL, &in, NULL); | |
23 | ||
ea27a18c | 24 | setenv("LESS", "FRSX", 0); |
f67b45f8 | 25 | } |
ea27a18c | 26 | #endif |
bfdd9ffd JS |
27 | |
28 | static const char *pager_argv[] = { "sh", "-c", NULL, NULL }; | |
ea27a18c JK |
29 | static struct child_process pager_process; |
30 | ||
bfdd9ffd JS |
31 | static void wait_for_pager(void) |
32 | { | |
33 | fflush(stdout); | |
34 | fflush(stderr); | |
35 | /* signal EOF to pager */ | |
36 | close(1); | |
37 | close(2); | |
38 | finish_command(&pager_process); | |
39 | } | |
f67b45f8 LT |
40 | |
41 | void setup_pager(void) | |
42 | { | |
c27d205a | 43 | const char *pager = getenv("GIT_PAGER"); |
f67b45f8 LT |
44 | |
45 | if (!isatty(1)) | |
46 | return; | |
cad3a205 JH |
47 | if (!pager) { |
48 | if (!pager_program) | |
ef90d6d4 | 49 | git_config(git_default_config, NULL); |
54adf370 | 50 | pager = pager_program; |
cad3a205 | 51 | } |
c27d205a ML |
52 | if (!pager) |
53 | pager = getenv("PAGER"); | |
402461aa JS |
54 | if (!pager) |
55 | pager = "less"; | |
caef71a5 | 56 | else if (!*pager || !strcmp(pager, "cat")) |
402461aa JS |
57 | return; |
58 | ||
6e9af863 | 59 | spawned_pager = 1; /* means we are emitting to terminal */ |
85fb65ed | 60 | |
bfdd9ffd JS |
61 | /* spawn the pager */ |
62 | pager_argv[2] = pager; | |
ea27a18c JK |
63 | pager_process.argv = pager_argv; |
64 | pager_process.in = -1; | |
65 | #ifndef __MINGW32__ | |
66 | pager_process.preexec_cb = pager_preexec; | |
67 | #endif | |
bfdd9ffd JS |
68 | if (start_command(&pager_process)) |
69 | return; | |
70 | ||
71 | /* original process continues, but writes to the pipe */ | |
72 | dup2(pager_process.in, 1); | |
a8335024 JH |
73 | if (isatty(2)) |
74 | dup2(pager_process.in, 2); | |
bfdd9ffd JS |
75 | close(pager_process.in); |
76 | ||
77 | /* this makes sure that the parent terminates after the pager */ | |
78 | atexit(wait_for_pager); | |
f67b45f8 | 79 | } |
6e9af863 JK |
80 | |
81 | int pager_in_use(void) | |
82 | { | |
83 | const char *env; | |
84 | ||
85 | if (spawned_pager) | |
86 | return 1; | |
87 | ||
88 | env = getenv("GIT_PAGER_IN_USE"); | |
89 | return env ? git_config_bool("GIT_PAGER_IN_USE", env) : 0; | |
90 | } |