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Commit | Line | Data |
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f67b45f8 | 1 | #include "cache.h" |
ea27a18c | 2 | #include "run-command.h" |
a3da8821 | 3 | #include "sigchain.h" |
f67b45f8 LT |
4 | |
5 | /* | |
bfdd9ffd JS |
6 | * This is split up from the rest of git so that we can do |
7 | * something different on Windows. | |
f67b45f8 LT |
8 | */ |
9 | ||
6e9af863 JK |
10 | static int spawned_pager; |
11 | ||
71064e3f | 12 | #ifndef WIN32 |
ea27a18c | 13 | static void pager_preexec(void) |
f67b45f8 | 14 | { |
35ce8622 LT |
15 | /* |
16 | * Work around bug in "less" by not starting it until we | |
17 | * have real input | |
18 | */ | |
19 | fd_set in; | |
20 | ||
21 | FD_ZERO(&in); | |
22 | FD_SET(0, &in); | |
23 | select(1, &in, NULL, &in, NULL); | |
f67b45f8 | 24 | } |
ea27a18c | 25 | #endif |
bfdd9ffd JS |
26 | |
27 | static const char *pager_argv[] = { "sh", "-c", NULL, NULL }; | |
ea27a18c JK |
28 | static struct child_process pager_process; |
29 | ||
bfdd9ffd JS |
30 | static void wait_for_pager(void) |
31 | { | |
32 | fflush(stdout); | |
33 | fflush(stderr); | |
34 | /* signal EOF to pager */ | |
35 | close(1); | |
36 | close(2); | |
37 | finish_command(&pager_process); | |
38 | } | |
f67b45f8 | 39 | |
a3da8821 JK |
40 | static void wait_for_pager_signal(int signo) |
41 | { | |
42 | wait_for_pager(); | |
43 | sigchain_pop(signo); | |
44 | raise(signo); | |
45 | } | |
46 | ||
f67b45f8 LT |
47 | void setup_pager(void) |
48 | { | |
c27d205a | 49 | const char *pager = getenv("GIT_PAGER"); |
f67b45f8 LT |
50 | |
51 | if (!isatty(1)) | |
52 | return; | |
cad3a205 JH |
53 | if (!pager) { |
54 | if (!pager_program) | |
ef90d6d4 | 55 | git_config(git_default_config, NULL); |
54adf370 | 56 | pager = pager_program; |
cad3a205 | 57 | } |
c27d205a ML |
58 | if (!pager) |
59 | pager = getenv("PAGER"); | |
402461aa JS |
60 | if (!pager) |
61 | pager = "less"; | |
caef71a5 | 62 | else if (!*pager || !strcmp(pager, "cat")) |
402461aa JS |
63 | return; |
64 | ||
6e9af863 | 65 | spawned_pager = 1; /* means we are emitting to terminal */ |
85fb65ed | 66 | |
bfdd9ffd JS |
67 | /* spawn the pager */ |
68 | pager_argv[2] = pager; | |
ea27a18c JK |
69 | pager_process.argv = pager_argv; |
70 | pager_process.in = -1; | |
25fc1786 JS |
71 | if (!getenv("LESS")) { |
72 | static const char *env[] = { "LESS=FRSX", NULL }; | |
73 | pager_process.env = env; | |
74 | } | |
71064e3f | 75 | #ifndef WIN32 |
ea27a18c JK |
76 | pager_process.preexec_cb = pager_preexec; |
77 | #endif | |
bfdd9ffd JS |
78 | if (start_command(&pager_process)) |
79 | return; | |
80 | ||
81 | /* original process continues, but writes to the pipe */ | |
82 | dup2(pager_process.in, 1); | |
a8335024 JH |
83 | if (isatty(2)) |
84 | dup2(pager_process.in, 2); | |
bfdd9ffd JS |
85 | close(pager_process.in); |
86 | ||
87 | /* this makes sure that the parent terminates after the pager */ | |
a3da8821 | 88 | sigchain_push_common(wait_for_pager_signal); |
bfdd9ffd | 89 | atexit(wait_for_pager); |
f67b45f8 | 90 | } |
6e9af863 JK |
91 | |
92 | int pager_in_use(void) | |
93 | { | |
94 | const char *env; | |
95 | ||
96 | if (spawned_pager) | |
97 | return 1; | |
98 | ||
99 | env = getenv("GIT_PAGER_IN_USE"); | |
100 | return env ? git_config_bool("GIT_PAGER_IN_USE", env) : 0; | |
101 | } |