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1 | #include "cache.h" | |
2 | ||
3 | /* | |
4 | * This is split up from the rest of git so that we can do | |
5 | * something different on Windows. | |
6 | */ | |
7 | ||
8 | static int spawned_pager; | |
9 | ||
10 | #ifndef __MINGW32__ | |
11 | static void run_pager(const char *pager) | |
12 | { | |
13 | /* | |
14 | * Work around bug in "less" by not starting it until we | |
15 | * have real input | |
16 | */ | |
17 | fd_set in; | |
18 | ||
19 | FD_ZERO(&in); | |
20 | FD_SET(0, &in); | |
21 | select(1, &in, NULL, &in, NULL); | |
22 | ||
23 | execlp(pager, pager, NULL); | |
24 | execl("/bin/sh", "sh", "-c", pager, NULL); | |
25 | } | |
26 | #else | |
27 | #include "run-command.h" | |
28 | ||
29 | static const char *pager_argv[] = { "sh", "-c", NULL, NULL }; | |
30 | static struct child_process pager_process = { | |
31 | .argv = pager_argv, | |
32 | .in = -1 | |
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 | #endif | |
44 | ||
45 | void setup_pager(void) | |
46 | { | |
47 | #ifndef __MINGW32__ | |
48 | pid_t pid; | |
49 | int fd[2]; | |
50 | #endif | |
51 | const char *pager = getenv("GIT_PAGER"); | |
52 | ||
53 | if (!isatty(1)) | |
54 | return; | |
55 | if (!pager) { | |
56 | if (!pager_program) | |
57 | git_config(git_default_config, NULL); | |
58 | pager = pager_program; | |
59 | } | |
60 | if (!pager) | |
61 | pager = getenv("PAGER"); | |
62 | if (!pager) | |
63 | pager = "less"; | |
64 | else if (!*pager || !strcmp(pager, "cat")) | |
65 | return; | |
66 | ||
67 | spawned_pager = 1; /* means we are emitting to terminal */ | |
68 | ||
69 | #ifndef __MINGW32__ | |
70 | if (pipe(fd) < 0) | |
71 | return; | |
72 | pid = fork(); | |
73 | if (pid < 0) { | |
74 | close(fd[0]); | |
75 | close(fd[1]); | |
76 | return; | |
77 | } | |
78 | ||
79 | /* return in the child */ | |
80 | if (!pid) { | |
81 | dup2(fd[1], 1); | |
82 | dup2(fd[1], 2); | |
83 | close(fd[0]); | |
84 | close(fd[1]); | |
85 | return; | |
86 | } | |
87 | ||
88 | /* The original process turns into the PAGER */ | |
89 | dup2(fd[0], 0); | |
90 | close(fd[0]); | |
91 | close(fd[1]); | |
92 | ||
93 | setenv("LESS", "FRSX", 0); | |
94 | run_pager(pager); | |
95 | die("unable to execute pager '%s'", pager); | |
96 | exit(255); | |
97 | #else | |
98 | /* spawn the pager */ | |
99 | pager_argv[2] = pager; | |
100 | if (start_command(&pager_process)) | |
101 | return; | |
102 | ||
103 | /* original process continues, but writes to the pipe */ | |
104 | dup2(pager_process.in, 1); | |
105 | if (isatty(2)) | |
106 | dup2(pager_process.in, 2); | |
107 | close(pager_process.in); | |
108 | ||
109 | /* this makes sure that the parent terminates after the pager */ | |
110 | atexit(wait_for_pager); | |
111 | #endif | |
112 | } | |
113 | ||
114 | int pager_in_use(void) | |
115 | { | |
116 | const char *env; | |
117 | ||
118 | if (spawned_pager) | |
119 | return 1; | |
120 | ||
121 | env = getenv("GIT_PAGER_IN_USE"); | |
122 | return env ? git_config_bool("GIT_PAGER_IN_USE", env) : 0; | |
123 | } |