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Commit | Line | Data |
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f67b45f8 | 1 | #include "cache.h" |
ea27a18c | 2 | #include "run-command.h" |
a3da8821 | 3 | #include "sigchain.h" |
f67b45f8 | 4 | |
a3d023d0 JH |
5 | #ifndef DEFAULT_PAGER |
6 | #define DEFAULT_PAGER "less" | |
7 | #endif | |
8 | ||
f67b45f8 | 9 | /* |
bfdd9ffd JS |
10 | * This is split up from the rest of git so that we can do |
11 | * something different on Windows. | |
f67b45f8 LT |
12 | */ |
13 | ||
d3180279 | 14 | static struct child_process pager_process = CHILD_PROCESS_INIT; |
ea27a18c | 15 | |
bfdd9ffd JS |
16 | static void wait_for_pager(void) |
17 | { | |
18 | fflush(stdout); | |
19 | fflush(stderr); | |
20 | /* signal EOF to pager */ | |
21 | close(1); | |
22 | close(2); | |
23 | finish_command(&pager_process); | |
24 | } | |
f67b45f8 | 25 | |
a3da8821 JK |
26 | static void wait_for_pager_signal(int signo) |
27 | { | |
28 | wait_for_pager(); | |
29 | sigchain_pop(signo); | |
30 | raise(signo); | |
31 | } | |
32 | ||
64778d24 | 33 | const char *git_pager(int stdout_is_tty) |
f67b45f8 | 34 | { |
63618245 | 35 | const char *pager; |
f67b45f8 | 36 | |
64778d24 | 37 | if (!stdout_is_tty) |
63618245 JN |
38 | return NULL; |
39 | ||
40 | pager = getenv("GIT_PAGER"); | |
cad3a205 JH |
41 | if (!pager) { |
42 | if (!pager_program) | |
ef90d6d4 | 43 | git_config(git_default_config, NULL); |
54adf370 | 44 | pager = pager_program; |
cad3a205 | 45 | } |
c27d205a ML |
46 | if (!pager) |
47 | pager = getenv("PAGER"); | |
402461aa | 48 | if (!pager) |
a3d023d0 | 49 | pager = DEFAULT_PAGER; |
ed016612 | 50 | if (!*pager || !strcmp(pager, "cat")) |
63618245 JN |
51 | pager = NULL; |
52 | ||
53 | return pager; | |
54 | } | |
55 | ||
56 | void setup_pager(void) | |
57 | { | |
64778d24 | 58 | const char *pager = git_pager(isatty(1)); |
63618245 | 59 | |
c0459ca4 | 60 | if (!pager) |
402461aa JS |
61 | return; |
62 | ||
ad6c3739 ZJS |
63 | /* |
64 | * force computing the width of the terminal before we redirect | |
65 | * the standard output to the pager. | |
66 | */ | |
67 | (void) term_columns(); | |
68 | ||
2e6c012e | 69 | setenv("GIT_PAGER_IN_USE", "true", 1); |
85fb65ed | 70 | |
bfdd9ffd | 71 | /* spawn the pager */ |
43b01902 | 72 | argv_array_push(&pager_process.args, pager); |
ac0ba18d | 73 | pager_process.use_shell = 1; |
ea27a18c | 74 | pager_process.in = -1; |
a9154590 RS |
75 | if (!getenv("LESS")) |
76 | argv_array_push(&pager_process.env_array, "LESS=FRX"); | |
77 | if (!getenv("LV")) | |
78 | argv_array_push(&pager_process.env_array, "LV=-c"); | |
124b5190 | 79 | argv_array_push(&pager_process.env_array, "GIT_PAGER_IN_USE"); |
bfdd9ffd JS |
80 | if (start_command(&pager_process)) |
81 | return; | |
82 | ||
83 | /* original process continues, but writes to the pipe */ | |
84 | dup2(pager_process.in, 1); | |
a8335024 JH |
85 | if (isatty(2)) |
86 | dup2(pager_process.in, 2); | |
bfdd9ffd JS |
87 | close(pager_process.in); |
88 | ||
89 | /* this makes sure that the parent terminates after the pager */ | |
a3da8821 | 90 | sigchain_push_common(wait_for_pager_signal); |
bfdd9ffd | 91 | atexit(wait_for_pager); |
f67b45f8 | 92 | } |
6e9af863 JK |
93 | |
94 | int pager_in_use(void) | |
95 | { | |
96 | const char *env; | |
6e9af863 JK |
97 | env = getenv("GIT_PAGER_IN_USE"); |
98 | return env ? git_config_bool("GIT_PAGER_IN_USE", env) : 0; | |
99 | } | |
ad6c3739 ZJS |
100 | |
101 | /* | |
102 | * Return cached value (if set) or $COLUMNS environment variable (if | |
103 | * set and positive) or ioctl(1, TIOCGWINSZ).ws_col (if positive), | |
104 | * and default to 80 if all else fails. | |
105 | */ | |
106 | int term_columns(void) | |
107 | { | |
108 | static int term_columns_at_startup; | |
109 | ||
110 | char *col_string; | |
111 | int n_cols; | |
112 | ||
113 | if (term_columns_at_startup) | |
114 | return term_columns_at_startup; | |
115 | ||
116 | term_columns_at_startup = 80; | |
117 | ||
118 | col_string = getenv("COLUMNS"); | |
119 | if (col_string && (n_cols = atoi(col_string)) > 0) | |
120 | term_columns_at_startup = n_cols; | |
121 | #ifdef TIOCGWINSZ | |
122 | else { | |
123 | struct winsize ws; | |
124 | if (!ioctl(1, TIOCGWINSZ, &ws) && ws.ws_col) | |
125 | term_columns_at_startup = ws.ws_col; | |
126 | } | |
127 | #endif | |
128 | ||
129 | return term_columns_at_startup; | |
130 | } | |
4d9e079e | 131 | |
ec7ff5ba ZJS |
132 | /* |
133 | * How many columns do we need to show this number in decimal? | |
134 | */ | |
d306f3d3 | 135 | int decimal_width(uintmax_t number) |
ec7ff5ba | 136 | { |
d306f3d3 | 137 | int width; |
ec7ff5ba | 138 | |
d306f3d3 JK |
139 | for (width = 1; number >= 10; width++) |
140 | number /= 10; | |
ec7ff5ba ZJS |
141 | return width; |
142 | } | |
4914c962 | 143 | |
586f414a TA |
144 | /* returns 0 for "no pager", 1 for "use pager", and -1 for "not specified" */ |
145 | int check_pager_config(const char *cmd) | |
4914c962 | 146 | { |
586f414a TA |
147 | int want = -1; |
148 | struct strbuf key = STRBUF_INIT; | |
149 | const char *value = NULL; | |
150 | strbuf_addf(&key, "pager.%s", cmd); | |
151 | if (!git_config_get_value(key.buf, &value)) { | |
152 | int b = git_config_maybe_bool(key.buf, value); | |
4914c962 | 153 | if (b >= 0) |
586f414a | 154 | want = b; |
4914c962 | 155 | else { |
586f414a TA |
156 | want = 1; |
157 | pager_program = xstrdup(value); | |
4914c962 NTND |
158 | } |
159 | } | |
586f414a TA |
160 | strbuf_release(&key); |
161 | return want; | |
4914c962 | 162 | } |