Commit | Line | Data |
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a930d2c0 IM |
1 | #include "cache.h" |
2 | #include "run-command.h" | |
3 | #include "sigchain.h" | |
096d3558 | 4 | #include "subcmd-config.h" |
a930d2c0 IM |
5 | |
6 | /* | |
7 | * This is split up from the rest of git so that we can do | |
8 | * something different on Windows. | |
9 | */ | |
10 | ||
11 | static int spawned_pager; | |
12 | ||
096d3558 JP |
13 | void pager_init(const char *pager_env) |
14 | { | |
15 | subcmd_config.pager_env = pager_env; | |
16 | } | |
17 | ||
a930d2c0 IM |
18 | static void pager_preexec(void) |
19 | { | |
20 | /* | |
21 | * Work around bug in "less" by not starting it until we | |
22 | * have real input | |
23 | */ | |
24 | fd_set in; | |
25 | ||
26 | FD_ZERO(&in); | |
27 | FD_SET(0, &in); | |
28 | select(1, &in, NULL, &in, NULL); | |
29 | ||
30 | setenv("LESS", "FRSX", 0); | |
31 | } | |
a930d2c0 IM |
32 | |
33 | static const char *pager_argv[] = { "sh", "-c", NULL, NULL }; | |
34 | static struct child_process pager_process; | |
35 | ||
36 | static void wait_for_pager(void) | |
37 | { | |
38 | fflush(stdout); | |
39 | fflush(stderr); | |
40 | /* signal EOF to pager */ | |
41 | close(1); | |
42 | close(2); | |
43 | finish_command(&pager_process); | |
44 | } | |
45 | ||
46 | static void wait_for_pager_signal(int signo) | |
47 | { | |
48 | wait_for_pager(); | |
49 | sigchain_pop(signo); | |
50 | raise(signo); | |
51 | } | |
52 | ||
53 | void setup_pager(void) | |
54 | { | |
096d3558 | 55 | const char *pager = getenv(subcmd_config.pager_env); |
a930d2c0 IM |
56 | |
57 | if (!isatty(1)) | |
58 | return; | |
a930d2c0 IM |
59 | if (!pager) |
60 | pager = getenv("PAGER"); | |
21cfc5e1 ML |
61 | if (!(pager || access("/usr/bin/pager", X_OK))) |
62 | pager = "/usr/bin/pager"; | |
63 | if (!(pager || access("/usr/bin/less", X_OK))) | |
64 | pager = "/usr/bin/less"; | |
a930d2c0 | 65 | if (!pager) |
21cfc5e1 ML |
66 | pager = "cat"; |
67 | if (!*pager || !strcmp(pager, "cat")) | |
a930d2c0 IM |
68 | return; |
69 | ||
70 | spawned_pager = 1; /* means we are emitting to terminal */ | |
71 | ||
72 | /* spawn the pager */ | |
73 | pager_argv[2] = pager; | |
74 | pager_process.argv = pager_argv; | |
75 | pager_process.in = -1; | |
a930d2c0 | 76 | pager_process.preexec_cb = pager_preexec; |
fde953c1 | 77 | |
a930d2c0 IM |
78 | if (start_command(&pager_process)) |
79 | return; | |
80 | ||
81 | /* original process continues, but writes to the pipe */ | |
82 | dup2(pager_process.in, 1); | |
83 | if (isatty(2)) | |
84 | dup2(pager_process.in, 2); | |
85 | close(pager_process.in); | |
86 | ||
87 | /* this makes sure that the parent terminates after the pager */ | |
88 | sigchain_push_common(wait_for_pager_signal); | |
89 | atexit(wait_for_pager); | |
90 | } | |
91 | ||
92 | int pager_in_use(void) | |
93 | { | |
a871a775 | 94 | return spawned_pager; |
a930d2c0 | 95 | } |