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1 | #include "cache.h" | |
2 | #include "run-command.h" | |
3 | #include "sigchain.h" | |
4 | ||
5 | #ifndef DEFAULT_PAGER | |
6 | #define DEFAULT_PAGER "less" | |
7 | #endif | |
8 | ||
9 | /* | |
10 | * This is split up from the rest of git so that we can do | |
11 | * something different on Windows. | |
12 | */ | |
13 | ||
14 | static int spawned_pager; | |
15 | ||
16 | #ifndef WIN32 | |
17 | static void pager_preexec(void) | |
18 | { | |
19 | /* | |
20 | * Work around bug in "less" by not starting it until we | |
21 | * have real input | |
22 | */ | |
23 | fd_set in; | |
24 | ||
25 | FD_ZERO(&in); | |
26 | FD_SET(0, &in); | |
27 | select(1, &in, NULL, &in, NULL); | |
28 | } | |
29 | #endif | |
30 | ||
31 | static const char *pager_argv[] = { NULL, NULL }; | |
32 | static struct child_process pager_process; | |
33 | ||
34 | static void wait_for_pager(void) | |
35 | { | |
36 | fflush(stdout); | |
37 | fflush(stderr); | |
38 | /* signal EOF to pager */ | |
39 | close(1); | |
40 | close(2); | |
41 | finish_command(&pager_process); | |
42 | } | |
43 | ||
44 | static void wait_for_pager_signal(int signo) | |
45 | { | |
46 | wait_for_pager(); | |
47 | sigchain_pop(signo); | |
48 | raise(signo); | |
49 | } | |
50 | ||
51 | const char *git_pager(int stdout_is_tty) | |
52 | { | |
53 | const char *pager; | |
54 | ||
55 | if (!stdout_is_tty) | |
56 | return NULL; | |
57 | ||
58 | pager = getenv("GIT_PAGER"); | |
59 | if (!pager) { | |
60 | if (!pager_program) | |
61 | git_config(git_default_config, NULL); | |
62 | pager = pager_program; | |
63 | } | |
64 | if (!pager) | |
65 | pager = getenv("PAGER"); | |
66 | if (!pager) | |
67 | pager = DEFAULT_PAGER; | |
68 | else if (!*pager || !strcmp(pager, "cat")) | |
69 | pager = NULL; | |
70 | ||
71 | return pager; | |
72 | } | |
73 | ||
74 | void setup_pager(void) | |
75 | { | |
76 | const char *pager = git_pager(isatty(1)); | |
77 | ||
78 | if (!pager) | |
79 | return; | |
80 | ||
81 | spawned_pager = 1; /* means we are emitting to terminal */ | |
82 | ||
83 | /* spawn the pager */ | |
84 | pager_argv[0] = pager; | |
85 | pager_process.use_shell = 1; | |
86 | pager_process.argv = pager_argv; | |
87 | pager_process.in = -1; | |
88 | if (!getenv("LESS")) { | |
89 | static const char *env[] = { "LESS=FRSX", NULL }; | |
90 | pager_process.env = env; | |
91 | } | |
92 | #ifndef WIN32 | |
93 | pager_process.preexec_cb = pager_preexec; | |
94 | #endif | |
95 | if (start_command(&pager_process)) | |
96 | return; | |
97 | ||
98 | /* original process continues, but writes to the pipe */ | |
99 | dup2(pager_process.in, 1); | |
100 | if (isatty(2)) | |
101 | dup2(pager_process.in, 2); | |
102 | close(pager_process.in); | |
103 | ||
104 | /* this makes sure that the parent terminates after the pager */ | |
105 | sigchain_push_common(wait_for_pager_signal); | |
106 | atexit(wait_for_pager); | |
107 | } | |
108 | ||
109 | int pager_in_use(void) | |
110 | { | |
111 | const char *env; | |
112 | ||
113 | if (spawned_pager) | |
114 | return 1; | |
115 | ||
116 | env = getenv("GIT_PAGER_IN_USE"); | |
117 | return env ? git_config_bool("GIT_PAGER_IN_USE", env) : 0; | |
118 | } |