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a930d2c0 IM |
1 | #include "cache.h" |
2 | #include "run-command.h" | |
3 | #include "sigchain.h" | |
4 | ||
5 | /* | |
6 | * This is split up from the rest of git so that we can do | |
7 | * something different on Windows. | |
8 | */ | |
9 | ||
10 | static int spawned_pager; | |
11 | ||
a930d2c0 IM |
12 | static void pager_preexec(void) |
13 | { | |
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 | ||
24 | setenv("LESS", "FRSX", 0); | |
25 | } | |
a930d2c0 IM |
26 | |
27 | static const char *pager_argv[] = { "sh", "-c", NULL, NULL }; | |
28 | static struct child_process pager_process; | |
29 | ||
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 | } | |
39 | ||
40 | static void wait_for_pager_signal(int signo) | |
41 | { | |
42 | wait_for_pager(); | |
43 | sigchain_pop(signo); | |
44 | raise(signo); | |
45 | } | |
46 | ||
47 | void setup_pager(void) | |
48 | { | |
49 | const char *pager = getenv("PERF_PAGER"); | |
50 | ||
51 | if (!isatty(1)) | |
52 | return; | |
53 | if (!pager) { | |
54 | if (!pager_program) | |
55 | perf_config(perf_default_config, NULL); | |
56 | pager = pager_program; | |
57 | } | |
58 | if (!pager) | |
59 | pager = getenv("PAGER"); | |
60 | if (!pager) | |
61 | pager = "less"; | |
62 | else if (!*pager || !strcmp(pager, "cat")) | |
63 | return; | |
64 | ||
65 | spawned_pager = 1; /* means we are emitting to terminal */ | |
66 | ||
67 | /* spawn the pager */ | |
68 | pager_argv[2] = pager; | |
69 | pager_process.argv = pager_argv; | |
70 | pager_process.in = -1; | |
a930d2c0 | 71 | pager_process.preexec_cb = pager_preexec; |
fde953c1 | 72 | |
a930d2c0 IM |
73 | if (start_command(&pager_process)) |
74 | return; | |
75 | ||
76 | /* original process continues, but writes to the pipe */ | |
77 | dup2(pager_process.in, 1); | |
78 | if (isatty(2)) | |
79 | dup2(pager_process.in, 2); | |
80 | close(pager_process.in); | |
81 | ||
82 | /* this makes sure that the parent terminates after the pager */ | |
83 | sigchain_push_common(wait_for_pager_signal); | |
84 | atexit(wait_for_pager); | |
85 | } | |
86 | ||
87 | int pager_in_use(void) | |
88 | { | |
89 | const char *env; | |
90 | ||
91 | if (spawned_pager) | |
92 | return 1; | |
93 | ||
94 | env = getenv("PERF_PAGER_IN_USE"); | |
95 | return env ? perf_config_bool("PERF_PAGER_IN_USE", env) : 0; | |
96 | } |