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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 | ||
d3180279 | 9 | static struct child_process pager_process = CHILD_PROCESS_INIT; |
ea27a18c | 10 | |
507d7804 | 11 | static void wait_for_pager(int in_signal) |
bfdd9ffd | 12 | { |
507d7804 TI |
13 | if (!in_signal) { |
14 | fflush(stdout); | |
15 | fflush(stderr); | |
16 | } | |
bfdd9ffd JS |
17 | /* signal EOF to pager */ |
18 | close(1); | |
19 | close(2); | |
507d7804 TI |
20 | if (in_signal) |
21 | finish_command_in_signal(&pager_process); | |
22 | else | |
23 | finish_command(&pager_process); | |
24 | } | |
25 | ||
26 | static void wait_for_pager_atexit(void) | |
27 | { | |
28 | wait_for_pager(0); | |
bfdd9ffd | 29 | } |
f67b45f8 | 30 | |
a3da8821 JK |
31 | static void wait_for_pager_signal(int signo) |
32 | { | |
507d7804 | 33 | wait_for_pager(1); |
a3da8821 JK |
34 | sigchain_pop(signo); |
35 | raise(signo); | |
36 | } | |
37 | ||
4babb839 JK |
38 | static int core_pager_config(const char *var, const char *value, void *data) |
39 | { | |
40 | if (!strcmp(var, "core.pager")) | |
41 | return git_config_string(&pager_program, var, value); | |
42 | return 0; | |
43 | } | |
44 | ||
64778d24 | 45 | const char *git_pager(int stdout_is_tty) |
f67b45f8 | 46 | { |
63618245 | 47 | const char *pager; |
f67b45f8 | 48 | |
64778d24 | 49 | if (!stdout_is_tty) |
63618245 JN |
50 | return NULL; |
51 | ||
52 | pager = getenv("GIT_PAGER"); | |
cad3a205 JH |
53 | if (!pager) { |
54 | if (!pager_program) | |
4babb839 | 55 | git_config(core_pager_config, NULL); |
54adf370 | 56 | pager = pager_program; |
cad3a205 | 57 | } |
c27d205a ML |
58 | if (!pager) |
59 | pager = getenv("PAGER"); | |
402461aa | 60 | if (!pager) |
a3d023d0 | 61 | pager = DEFAULT_PAGER; |
ed016612 | 62 | if (!*pager || !strcmp(pager, "cat")) |
63618245 JN |
63 | pager = NULL; |
64 | ||
65 | return pager; | |
66 | } | |
67 | ||
3e3a4a41 JH |
68 | void prepare_pager_args(struct child_process *pager_process, const char *pager) |
69 | { | |
70 | argv_array_push(&pager_process->args, pager); | |
71 | pager_process->use_shell = 1; | |
72 | if (!getenv("LESS")) | |
73 | argv_array_push(&pager_process->env_array, "LESS=FRX"); | |
74 | if (!getenv("LV")) | |
75 | argv_array_push(&pager_process->env_array, "LV=-c"); | |
76 | } | |
77 | ||
63618245 JN |
78 | void setup_pager(void) |
79 | { | |
64778d24 | 80 | const char *pager = git_pager(isatty(1)); |
63618245 | 81 | |
c0459ca4 | 82 | if (!pager) |
402461aa JS |
83 | return; |
84 | ||
ad6c3739 ZJS |
85 | /* |
86 | * force computing the width of the terminal before we redirect | |
87 | * the standard output to the pager. | |
88 | */ | |
89 | (void) term_columns(); | |
90 | ||
2e6c012e | 91 | setenv("GIT_PAGER_IN_USE", "true", 1); |
85fb65ed | 92 | |
bfdd9ffd | 93 | /* spawn the pager */ |
3e3a4a41 | 94 | prepare_pager_args(&pager_process, pager); |
ea27a18c | 95 | pager_process.in = -1; |
124b5190 | 96 | argv_array_push(&pager_process.env_array, "GIT_PAGER_IN_USE"); |
bfdd9ffd JS |
97 | if (start_command(&pager_process)) |
98 | return; | |
99 | ||
100 | /* original process continues, but writes to the pipe */ | |
101 | dup2(pager_process.in, 1); | |
a8335024 JH |
102 | if (isatty(2)) |
103 | dup2(pager_process.in, 2); | |
bfdd9ffd JS |
104 | close(pager_process.in); |
105 | ||
106 | /* this makes sure that the parent terminates after the pager */ | |
a3da8821 | 107 | sigchain_push_common(wait_for_pager_signal); |
507d7804 | 108 | atexit(wait_for_pager_atexit); |
f67b45f8 | 109 | } |
6e9af863 JK |
110 | |
111 | int pager_in_use(void) | |
112 | { | |
113 | const char *env; | |
6e9af863 JK |
114 | env = getenv("GIT_PAGER_IN_USE"); |
115 | return env ? git_config_bool("GIT_PAGER_IN_USE", env) : 0; | |
116 | } | |
ad6c3739 ZJS |
117 | |
118 | /* | |
119 | * Return cached value (if set) or $COLUMNS environment variable (if | |
120 | * set and positive) or ioctl(1, TIOCGWINSZ).ws_col (if positive), | |
121 | * and default to 80 if all else fails. | |
122 | */ | |
123 | int term_columns(void) | |
124 | { | |
125 | static int term_columns_at_startup; | |
126 | ||
127 | char *col_string; | |
128 | int n_cols; | |
129 | ||
130 | if (term_columns_at_startup) | |
131 | return term_columns_at_startup; | |
132 | ||
133 | term_columns_at_startup = 80; | |
134 | ||
135 | col_string = getenv("COLUMNS"); | |
136 | if (col_string && (n_cols = atoi(col_string)) > 0) | |
137 | term_columns_at_startup = n_cols; | |
138 | #ifdef TIOCGWINSZ | |
139 | else { | |
140 | struct winsize ws; | |
141 | if (!ioctl(1, TIOCGWINSZ, &ws) && ws.ws_col) | |
142 | term_columns_at_startup = ws.ws_col; | |
143 | } | |
144 | #endif | |
145 | ||
146 | return term_columns_at_startup; | |
147 | } | |
4d9e079e | 148 | |
ec7ff5ba ZJS |
149 | /* |
150 | * How many columns do we need to show this number in decimal? | |
151 | */ | |
d306f3d3 | 152 | int decimal_width(uintmax_t number) |
ec7ff5ba | 153 | { |
d306f3d3 | 154 | int width; |
ec7ff5ba | 155 | |
d306f3d3 JK |
156 | for (width = 1; number >= 10; width++) |
157 | number /= 10; | |
ec7ff5ba ZJS |
158 | return width; |
159 | } | |
4914c962 | 160 | |
586f414a TA |
161 | /* returns 0 for "no pager", 1 for "use pager", and -1 for "not specified" */ |
162 | int check_pager_config(const char *cmd) | |
4914c962 | 163 | { |
586f414a TA |
164 | int want = -1; |
165 | struct strbuf key = STRBUF_INIT; | |
166 | const char *value = NULL; | |
167 | strbuf_addf(&key, "pager.%s", cmd); | |
9e9de18f JK |
168 | if (git_config_key_is_valid(key.buf) && |
169 | !git_config_get_value(key.buf, &value)) { | |
586f414a | 170 | int b = git_config_maybe_bool(key.buf, value); |
4914c962 | 171 | if (b >= 0) |
586f414a | 172 | want = b; |
4914c962 | 173 | else { |
586f414a TA |
174 | want = 1; |
175 | pager_program = xstrdup(value); | |
4914c962 NTND |
176 | } |
177 | } | |
586f414a TA |
178 | strbuf_release(&key); |
179 | return want; | |
4914c962 | 180 | } |