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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 | ||
ac0ba18d | 14 | static const char *pager_argv[] = { NULL, NULL }; |
d3180279 | 15 | static struct child_process pager_process = CHILD_PROCESS_INIT; |
ea27a18c | 16 | |
507d7804 | 17 | static void wait_for_pager(int in_signal) |
bfdd9ffd | 18 | { |
507d7804 TI |
19 | if (!in_signal) { |
20 | fflush(stdout); | |
21 | fflush(stderr); | |
22 | } | |
bfdd9ffd JS |
23 | /* signal EOF to pager */ |
24 | close(1); | |
25 | close(2); | |
507d7804 TI |
26 | if (in_signal) |
27 | finish_command_in_signal(&pager_process); | |
28 | else | |
29 | finish_command(&pager_process); | |
30 | } | |
31 | ||
32 | static void wait_for_pager_atexit(void) | |
33 | { | |
34 | wait_for_pager(0); | |
bfdd9ffd | 35 | } |
f67b45f8 | 36 | |
a3da8821 JK |
37 | static void wait_for_pager_signal(int signo) |
38 | { | |
507d7804 | 39 | wait_for_pager(1); |
a3da8821 JK |
40 | sigchain_pop(signo); |
41 | raise(signo); | |
42 | } | |
43 | ||
64778d24 | 44 | const char *git_pager(int stdout_is_tty) |
f67b45f8 | 45 | { |
63618245 | 46 | const char *pager; |
f67b45f8 | 47 | |
64778d24 | 48 | if (!stdout_is_tty) |
63618245 JN |
49 | return NULL; |
50 | ||
51 | pager = getenv("GIT_PAGER"); | |
cad3a205 JH |
52 | if (!pager) { |
53 | if (!pager_program) | |
ef90d6d4 | 54 | git_config(git_default_config, NULL); |
54adf370 | 55 | pager = pager_program; |
cad3a205 | 56 | } |
c27d205a ML |
57 | if (!pager) |
58 | pager = getenv("PAGER"); | |
402461aa | 59 | if (!pager) |
a3d023d0 | 60 | pager = DEFAULT_PAGER; |
ed016612 | 61 | if (!*pager || !strcmp(pager, "cat")) |
63618245 JN |
62 | pager = NULL; |
63 | ||
64 | return pager; | |
65 | } | |
66 | ||
67 | void setup_pager(void) | |
68 | { | |
64778d24 | 69 | const char *pager = git_pager(isatty(1)); |
63618245 | 70 | |
c0459ca4 | 71 | if (!pager) |
402461aa JS |
72 | return; |
73 | ||
ad6c3739 ZJS |
74 | /* |
75 | * force computing the width of the terminal before we redirect | |
76 | * the standard output to the pager. | |
77 | */ | |
78 | (void) term_columns(); | |
79 | ||
2e6c012e | 80 | setenv("GIT_PAGER_IN_USE", "true", 1); |
85fb65ed | 81 | |
bfdd9ffd | 82 | /* spawn the pager */ |
ac0ba18d JK |
83 | pager_argv[0] = pager; |
84 | pager_process.use_shell = 1; | |
ea27a18c JK |
85 | pager_process.argv = pager_argv; |
86 | pager_process.in = -1; | |
a9154590 RS |
87 | if (!getenv("LESS")) |
88 | argv_array_push(&pager_process.env_array, "LESS=FRX"); | |
89 | if (!getenv("LV")) | |
90 | argv_array_push(&pager_process.env_array, "LV=-c"); | |
124b5190 | 91 | argv_array_push(&pager_process.env_array, "GIT_PAGER_IN_USE"); |
bfdd9ffd JS |
92 | if (start_command(&pager_process)) |
93 | return; | |
94 | ||
95 | /* original process continues, but writes to the pipe */ | |
96 | dup2(pager_process.in, 1); | |
a8335024 JH |
97 | if (isatty(2)) |
98 | dup2(pager_process.in, 2); | |
bfdd9ffd JS |
99 | close(pager_process.in); |
100 | ||
101 | /* this makes sure that the parent terminates after the pager */ | |
a3da8821 | 102 | sigchain_push_common(wait_for_pager_signal); |
507d7804 | 103 | atexit(wait_for_pager_atexit); |
f67b45f8 | 104 | } |
6e9af863 JK |
105 | |
106 | int pager_in_use(void) | |
107 | { | |
108 | const char *env; | |
6e9af863 JK |
109 | env = getenv("GIT_PAGER_IN_USE"); |
110 | return env ? git_config_bool("GIT_PAGER_IN_USE", env) : 0; | |
111 | } | |
ad6c3739 ZJS |
112 | |
113 | /* | |
114 | * Return cached value (if set) or $COLUMNS environment variable (if | |
115 | * set and positive) or ioctl(1, TIOCGWINSZ).ws_col (if positive), | |
116 | * and default to 80 if all else fails. | |
117 | */ | |
118 | int term_columns(void) | |
119 | { | |
120 | static int term_columns_at_startup; | |
121 | ||
122 | char *col_string; | |
123 | int n_cols; | |
124 | ||
125 | if (term_columns_at_startup) | |
126 | return term_columns_at_startup; | |
127 | ||
128 | term_columns_at_startup = 80; | |
129 | ||
130 | col_string = getenv("COLUMNS"); | |
131 | if (col_string && (n_cols = atoi(col_string)) > 0) | |
132 | term_columns_at_startup = n_cols; | |
133 | #ifdef TIOCGWINSZ | |
134 | else { | |
135 | struct winsize ws; | |
136 | if (!ioctl(1, TIOCGWINSZ, &ws) && ws.ws_col) | |
137 | term_columns_at_startup = ws.ws_col; | |
138 | } | |
139 | #endif | |
140 | ||
141 | return term_columns_at_startup; | |
142 | } | |
4d9e079e | 143 | |
ec7ff5ba ZJS |
144 | /* |
145 | * How many columns do we need to show this number in decimal? | |
146 | */ | |
d306f3d3 | 147 | int decimal_width(uintmax_t number) |
ec7ff5ba | 148 | { |
d306f3d3 | 149 | int width; |
ec7ff5ba | 150 | |
d306f3d3 JK |
151 | for (width = 1; number >= 10; width++) |
152 | number /= 10; | |
ec7ff5ba ZJS |
153 | return width; |
154 | } | |
4914c962 | 155 | |
586f414a TA |
156 | /* returns 0 for "no pager", 1 for "use pager", and -1 for "not specified" */ |
157 | int check_pager_config(const char *cmd) | |
4914c962 | 158 | { |
586f414a TA |
159 | int want = -1; |
160 | struct strbuf key = STRBUF_INIT; | |
161 | const char *value = NULL; | |
162 | strbuf_addf(&key, "pager.%s", cmd); | |
9e9de18f JK |
163 | if (git_config_key_is_valid(key.buf) && |
164 | !git_config_get_value(key.buf, &value)) { | |
586f414a | 165 | int b = git_config_maybe_bool(key.buf, value); |
4914c962 | 166 | if (b >= 0) |
586f414a | 167 | want = b; |
4914c962 | 168 | else { |
586f414a TA |
169 | want = 1; |
170 | pager_program = xstrdup(value); | |
4914c962 NTND |
171 | } |
172 | } | |
586f414a TA |
173 | strbuf_release(&key); |
174 | return want; | |
4914c962 | 175 | } |