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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; |
c0c08897 | 10 | static const char *pager_program; |
ea27a18c | 11 | |
507d7804 | 12 | static void wait_for_pager(int in_signal) |
bfdd9ffd | 13 | { |
507d7804 TI |
14 | if (!in_signal) { |
15 | fflush(stdout); | |
16 | fflush(stderr); | |
17 | } | |
bfdd9ffd JS |
18 | /* signal EOF to pager */ |
19 | close(1); | |
20 | close(2); | |
507d7804 TI |
21 | if (in_signal) |
22 | finish_command_in_signal(&pager_process); | |
23 | else | |
24 | finish_command(&pager_process); | |
25 | } | |
26 | ||
27 | static void wait_for_pager_atexit(void) | |
28 | { | |
29 | wait_for_pager(0); | |
bfdd9ffd | 30 | } |
f67b45f8 | 31 | |
a3da8821 JK |
32 | static void wait_for_pager_signal(int signo) |
33 | { | |
507d7804 | 34 | wait_for_pager(1); |
a3da8821 JK |
35 | sigchain_pop(signo); |
36 | raise(signo); | |
37 | } | |
38 | ||
4babb839 JK |
39 | static int core_pager_config(const char *var, const char *value, void *data) |
40 | { | |
41 | if (!strcmp(var, "core.pager")) | |
42 | return git_config_string(&pager_program, var, value); | |
43 | return 0; | |
44 | } | |
45 | ||
64778d24 | 46 | const char *git_pager(int stdout_is_tty) |
f67b45f8 | 47 | { |
63618245 | 48 | const char *pager; |
f67b45f8 | 49 | |
64778d24 | 50 | if (!stdout_is_tty) |
63618245 JN |
51 | return NULL; |
52 | ||
53 | pager = getenv("GIT_PAGER"); | |
cad3a205 JH |
54 | if (!pager) { |
55 | if (!pager_program) | |
4babb839 | 56 | git_config(core_pager_config, NULL); |
54adf370 | 57 | pager = pager_program; |
cad3a205 | 58 | } |
c27d205a ML |
59 | if (!pager) |
60 | pager = getenv("PAGER"); | |
402461aa | 61 | if (!pager) |
a3d023d0 | 62 | pager = DEFAULT_PAGER; |
ed016612 | 63 | if (!*pager || !strcmp(pager, "cat")) |
63618245 JN |
64 | pager = NULL; |
65 | ||
66 | return pager; | |
67 | } | |
68 | ||
3e3a4a41 JH |
69 | void prepare_pager_args(struct child_process *pager_process, const char *pager) |
70 | { | |
71 | argv_array_push(&pager_process->args, pager); | |
72 | pager_process->use_shell = 1; | |
73 | if (!getenv("LESS")) | |
74 | argv_array_push(&pager_process->env_array, "LESS=FRX"); | |
75 | if (!getenv("LV")) | |
76 | argv_array_push(&pager_process->env_array, "LV=-c"); | |
77 | } | |
78 | ||
63618245 JN |
79 | void setup_pager(void) |
80 | { | |
64778d24 | 81 | const char *pager = git_pager(isatty(1)); |
63618245 | 82 | |
c0459ca4 | 83 | if (!pager) |
402461aa JS |
84 | return; |
85 | ||
ad6c3739 ZJS |
86 | /* |
87 | * force computing the width of the terminal before we redirect | |
88 | * the standard output to the pager. | |
89 | */ | |
90 | (void) term_columns(); | |
91 | ||
2e6c012e | 92 | setenv("GIT_PAGER_IN_USE", "true", 1); |
85fb65ed | 93 | |
bfdd9ffd | 94 | /* spawn the pager */ |
3e3a4a41 | 95 | prepare_pager_args(&pager_process, pager); |
ea27a18c | 96 | pager_process.in = -1; |
124b5190 | 97 | argv_array_push(&pager_process.env_array, "GIT_PAGER_IN_USE"); |
bfdd9ffd JS |
98 | if (start_command(&pager_process)) |
99 | return; | |
100 | ||
101 | /* original process continues, but writes to the pipe */ | |
102 | dup2(pager_process.in, 1); | |
a8335024 JH |
103 | if (isatty(2)) |
104 | dup2(pager_process.in, 2); | |
bfdd9ffd JS |
105 | close(pager_process.in); |
106 | ||
107 | /* this makes sure that the parent terminates after the pager */ | |
a3da8821 | 108 | sigchain_push_common(wait_for_pager_signal); |
507d7804 | 109 | atexit(wait_for_pager_atexit); |
f67b45f8 | 110 | } |
6e9af863 JK |
111 | |
112 | int pager_in_use(void) | |
113 | { | |
114 | const char *env; | |
6e9af863 JK |
115 | env = getenv("GIT_PAGER_IN_USE"); |
116 | return env ? git_config_bool("GIT_PAGER_IN_USE", env) : 0; | |
117 | } | |
ad6c3739 ZJS |
118 | |
119 | /* | |
120 | * Return cached value (if set) or $COLUMNS environment variable (if | |
121 | * set and positive) or ioctl(1, TIOCGWINSZ).ws_col (if positive), | |
122 | * and default to 80 if all else fails. | |
123 | */ | |
124 | int term_columns(void) | |
125 | { | |
126 | static int term_columns_at_startup; | |
127 | ||
128 | char *col_string; | |
129 | int n_cols; | |
130 | ||
131 | if (term_columns_at_startup) | |
132 | return term_columns_at_startup; | |
133 | ||
134 | term_columns_at_startup = 80; | |
135 | ||
136 | col_string = getenv("COLUMNS"); | |
137 | if (col_string && (n_cols = atoi(col_string)) > 0) | |
138 | term_columns_at_startup = n_cols; | |
139 | #ifdef TIOCGWINSZ | |
140 | else { | |
141 | struct winsize ws; | |
142 | if (!ioctl(1, TIOCGWINSZ, &ws) && ws.ws_col) | |
143 | term_columns_at_startup = ws.ws_col; | |
144 | } | |
145 | #endif | |
146 | ||
147 | return term_columns_at_startup; | |
148 | } | |
4d9e079e | 149 | |
ec7ff5ba ZJS |
150 | /* |
151 | * How many columns do we need to show this number in decimal? | |
152 | */ | |
d306f3d3 | 153 | int decimal_width(uintmax_t number) |
ec7ff5ba | 154 | { |
d306f3d3 | 155 | int width; |
ec7ff5ba | 156 | |
d306f3d3 JK |
157 | for (width = 1; number >= 10; width++) |
158 | number /= 10; | |
ec7ff5ba ZJS |
159 | return width; |
160 | } | |
4914c962 | 161 | |
6a1e1bc0 JK |
162 | struct pager_command_config_data { |
163 | const char *cmd; | |
164 | int want; | |
165 | char *value; | |
166 | }; | |
167 | ||
168 | static int pager_command_config(const char *var, const char *value, void *vdata) | |
4914c962 | 169 | { |
6a1e1bc0 JK |
170 | struct pager_command_config_data *data = vdata; |
171 | const char *cmd; | |
172 | ||
173 | if (skip_prefix(var, "pager.", &cmd) && !strcmp(cmd, data->cmd)) { | |
174 | int b = git_config_maybe_bool(var, value); | |
4914c962 | 175 | if (b >= 0) |
6a1e1bc0 | 176 | data->want = b; |
4914c962 | 177 | else { |
6a1e1bc0 JK |
178 | data->want = 1; |
179 | data->value = xstrdup(value); | |
4914c962 NTND |
180 | } |
181 | } | |
6a1e1bc0 JK |
182 | |
183 | return 0; | |
184 | } | |
185 | ||
186 | /* returns 0 for "no pager", 1 for "use pager", and -1 for "not specified" */ | |
187 | int check_pager_config(const char *cmd) | |
188 | { | |
189 | struct pager_command_config_data data; | |
190 | ||
191 | data.cmd = cmd; | |
192 | data.want = -1; | |
193 | data.value = NULL; | |
194 | ||
195 | git_config(pager_command_config, &data); | |
196 | ||
197 | if (data.value) | |
198 | pager_program = data.value; | |
199 | return data.want; | |
4914c962 | 200 | } |