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Commit | Line | Data |
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2f4ce5ec JP |
1 | #include <sys/select.h> |
2 | #include <stdlib.h> | |
3 | #include <stdio.h> | |
4 | #include <string.h> | |
5 | #include <signal.h> | |
61eb2eb4 | 6 | #include <sys/ioctl.h> |
2f4ce5ec | 7 | #include "pager.h" |
a930d2c0 IM |
8 | #include "run-command.h" |
9 | #include "sigchain.h" | |
096d3558 | 10 | #include "subcmd-config.h" |
a930d2c0 IM |
11 | |
12 | /* | |
13 | * This is split up from the rest of git so that we can do | |
14 | * something different on Windows. | |
15 | */ | |
16 | ||
17 | static int spawned_pager; | |
61eb2eb4 | 18 | static int pager_columns; |
a930d2c0 | 19 | |
096d3558 JP |
20 | void pager_init(const char *pager_env) |
21 | { | |
22 | subcmd_config.pager_env = pager_env; | |
23 | } | |
24 | ||
a930d2c0 IM |
25 | static void pager_preexec(void) |
26 | { | |
27 | /* | |
28 | * Work around bug in "less" by not starting it until we | |
29 | * have real input | |
30 | */ | |
31 | fd_set in; | |
32 | ||
33 | FD_ZERO(&in); | |
34 | FD_SET(0, &in); | |
35 | select(1, &in, NULL, &in, NULL); | |
36 | ||
37 | setenv("LESS", "FRSX", 0); | |
38 | } | |
a930d2c0 IM |
39 | |
40 | static const char *pager_argv[] = { "sh", "-c", NULL, NULL }; | |
41 | static struct child_process pager_process; | |
42 | ||
43 | static void wait_for_pager(void) | |
44 | { | |
45 | fflush(stdout); | |
46 | fflush(stderr); | |
47 | /* signal EOF to pager */ | |
48 | close(1); | |
49 | close(2); | |
50 | finish_command(&pager_process); | |
51 | } | |
52 | ||
53 | static void wait_for_pager_signal(int signo) | |
54 | { | |
55 | wait_for_pager(); | |
56 | sigchain_pop(signo); | |
57 | raise(signo); | |
58 | } | |
59 | ||
60 | void setup_pager(void) | |
61 | { | |
096d3558 | 62 | const char *pager = getenv(subcmd_config.pager_env); |
61eb2eb4 | 63 | struct winsize sz; |
a930d2c0 IM |
64 | |
65 | if (!isatty(1)) | |
66 | return; | |
61eb2eb4 AK |
67 | if (ioctl(1, TIOCGWINSZ, &sz) == 0) |
68 | pager_columns = sz.ws_col; | |
a930d2c0 IM |
69 | if (!pager) |
70 | pager = getenv("PAGER"); | |
21cfc5e1 ML |
71 | if (!(pager || access("/usr/bin/pager", X_OK))) |
72 | pager = "/usr/bin/pager"; | |
73 | if (!(pager || access("/usr/bin/less", X_OK))) | |
74 | pager = "/usr/bin/less"; | |
a930d2c0 | 75 | if (!pager) |
21cfc5e1 ML |
76 | pager = "cat"; |
77 | if (!*pager || !strcmp(pager, "cat")) | |
a930d2c0 IM |
78 | return; |
79 | ||
80 | spawned_pager = 1; /* means we are emitting to terminal */ | |
81 | ||
82 | /* spawn the pager */ | |
83 | pager_argv[2] = pager; | |
84 | pager_process.argv = pager_argv; | |
85 | pager_process.in = -1; | |
a930d2c0 | 86 | pager_process.preexec_cb = pager_preexec; |
fde953c1 | 87 | |
a930d2c0 IM |
88 | if (start_command(&pager_process)) |
89 | return; | |
90 | ||
91 | /* original process continues, but writes to the pipe */ | |
92 | dup2(pager_process.in, 1); | |
93 | if (isatty(2)) | |
94 | dup2(pager_process.in, 2); | |
95 | close(pager_process.in); | |
96 | ||
97 | /* this makes sure that the parent terminates after the pager */ | |
98 | sigchain_push_common(wait_for_pager_signal); | |
99 | atexit(wait_for_pager); | |
100 | } | |
101 | ||
102 | int pager_in_use(void) | |
103 | { | |
a871a775 | 104 | return spawned_pager; |
a930d2c0 | 105 | } |
61eb2eb4 AK |
106 | |
107 | int pager_get_columns(void) | |
108 | { | |
109 | char *s; | |
110 | ||
111 | s = getenv("COLUMNS"); | |
112 | if (s) | |
113 | return atoi(s); | |
114 | ||
115 | return (pager_columns ? pager_columns : 80) - 2; | |
116 | } |