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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 | ||
eed27072 JK |
46 | static void read_early_config(config_fn_t cb, void *data) |
47 | { | |
48 | git_config_with_options(cb, data, NULL, 1); | |
49 | ||
50 | /* | |
51 | * Note that this is a really dirty hack that does the wrong thing in | |
52 | * many cases. The crux of the problem is that we cannot run | |
53 | * setup_git_directory() early on in git's setup, so we have no idea if | |
54 | * we are in a repository or not, and therefore are not sure whether | |
55 | * and how to read repository-local config. | |
56 | * | |
57 | * So if we _aren't_ in a repository (or we are but we would reject its | |
58 | * core.repositoryformatversion), we'll read whatever is in .git/config | |
59 | * blindly. Similarly, if we _are_ in a repository, but not at the | |
60 | * root, we'll fail to find .git/config (because it's really | |
61 | * ../.git/config, etc). See t7006 for a complete set of failures. | |
62 | * | |
63 | * However, we have historically provided this hack because it does | |
64 | * work some of the time (namely when you are at the top-level of a | |
65 | * valid repository), and would rarely make things worse (i.e., you do | |
66 | * not generally have a .git/config file sitting around). | |
67 | */ | |
68 | if (!startup_info->have_repository) { | |
69 | struct git_config_source repo_config; | |
70 | ||
71 | memset(&repo_config, 0, sizeof(repo_config)); | |
72 | repo_config.file = ".git/config"; | |
73 | git_config_with_options(cb, data, &repo_config, 1); | |
74 | } | |
75 | } | |
76 | ||
64778d24 | 77 | const char *git_pager(int stdout_is_tty) |
f67b45f8 | 78 | { |
63618245 | 79 | const char *pager; |
f67b45f8 | 80 | |
64778d24 | 81 | if (!stdout_is_tty) |
63618245 JN |
82 | return NULL; |
83 | ||
84 | pager = getenv("GIT_PAGER"); | |
cad3a205 JH |
85 | if (!pager) { |
86 | if (!pager_program) | |
eed27072 | 87 | read_early_config(core_pager_config, NULL); |
54adf370 | 88 | pager = pager_program; |
cad3a205 | 89 | } |
c27d205a ML |
90 | if (!pager) |
91 | pager = getenv("PAGER"); | |
402461aa | 92 | if (!pager) |
a3d023d0 | 93 | pager = DEFAULT_PAGER; |
ed016612 | 94 | if (!*pager || !strcmp(pager, "cat")) |
63618245 JN |
95 | pager = NULL; |
96 | ||
97 | return pager; | |
98 | } | |
99 | ||
995bc22d EW |
100 | static void setup_pager_env(struct argv_array *env) |
101 | { | |
102 | const char **argv; | |
103 | int i; | |
104 | char *pager_env = xstrdup(PAGER_ENV); | |
105 | int n = split_cmdline(pager_env, &argv); | |
106 | ||
107 | if (n < 0) | |
108 | die("malformed build-time PAGER_ENV: %s", | |
109 | split_cmdline_strerror(n)); | |
110 | ||
111 | for (i = 0; i < n; i++) { | |
112 | char *cp = strchr(argv[i], '='); | |
113 | ||
114 | if (!cp) | |
115 | die("malformed build-time PAGER_ENV"); | |
116 | ||
117 | *cp = '\0'; | |
118 | if (!getenv(argv[i])) { | |
119 | *cp = '='; | |
120 | argv_array_push(env, argv[i]); | |
121 | } | |
122 | } | |
123 | free(pager_env); | |
124 | free(argv); | |
125 | } | |
126 | ||
3e3a4a41 JH |
127 | void prepare_pager_args(struct child_process *pager_process, const char *pager) |
128 | { | |
129 | argv_array_push(&pager_process->args, pager); | |
130 | pager_process->use_shell = 1; | |
995bc22d | 131 | setup_pager_env(&pager_process->env_array); |
3e3a4a41 JH |
132 | } |
133 | ||
63618245 JN |
134 | void setup_pager(void) |
135 | { | |
64778d24 | 136 | const char *pager = git_pager(isatty(1)); |
63618245 | 137 | |
c0459ca4 | 138 | if (!pager) |
402461aa JS |
139 | return; |
140 | ||
ad6c3739 ZJS |
141 | /* |
142 | * force computing the width of the terminal before we redirect | |
143 | * the standard output to the pager. | |
144 | */ | |
145 | (void) term_columns(); | |
146 | ||
2e6c012e | 147 | setenv("GIT_PAGER_IN_USE", "true", 1); |
85fb65ed | 148 | |
bfdd9ffd | 149 | /* spawn the pager */ |
3e3a4a41 | 150 | prepare_pager_args(&pager_process, pager); |
ea27a18c | 151 | pager_process.in = -1; |
124b5190 | 152 | argv_array_push(&pager_process.env_array, "GIT_PAGER_IN_USE"); |
bfdd9ffd JS |
153 | if (start_command(&pager_process)) |
154 | return; | |
155 | ||
156 | /* original process continues, but writes to the pipe */ | |
157 | dup2(pager_process.in, 1); | |
a8335024 JH |
158 | if (isatty(2)) |
159 | dup2(pager_process.in, 2); | |
bfdd9ffd JS |
160 | close(pager_process.in); |
161 | ||
162 | /* this makes sure that the parent terminates after the pager */ | |
a3da8821 | 163 | sigchain_push_common(wait_for_pager_signal); |
507d7804 | 164 | atexit(wait_for_pager_atexit); |
f67b45f8 | 165 | } |
6e9af863 JK |
166 | |
167 | int pager_in_use(void) | |
168 | { | |
169 | const char *env; | |
6e9af863 JK |
170 | env = getenv("GIT_PAGER_IN_USE"); |
171 | return env ? git_config_bool("GIT_PAGER_IN_USE", env) : 0; | |
172 | } | |
ad6c3739 ZJS |
173 | |
174 | /* | |
175 | * Return cached value (if set) or $COLUMNS environment variable (if | |
176 | * set and positive) or ioctl(1, TIOCGWINSZ).ws_col (if positive), | |
177 | * and default to 80 if all else fails. | |
178 | */ | |
179 | int term_columns(void) | |
180 | { | |
181 | static int term_columns_at_startup; | |
182 | ||
183 | char *col_string; | |
184 | int n_cols; | |
185 | ||
186 | if (term_columns_at_startup) | |
187 | return term_columns_at_startup; | |
188 | ||
189 | term_columns_at_startup = 80; | |
190 | ||
191 | col_string = getenv("COLUMNS"); | |
192 | if (col_string && (n_cols = atoi(col_string)) > 0) | |
193 | term_columns_at_startup = n_cols; | |
194 | #ifdef TIOCGWINSZ | |
195 | else { | |
196 | struct winsize ws; | |
197 | if (!ioctl(1, TIOCGWINSZ, &ws) && ws.ws_col) | |
198 | term_columns_at_startup = ws.ws_col; | |
199 | } | |
200 | #endif | |
201 | ||
202 | return term_columns_at_startup; | |
203 | } | |
4d9e079e | 204 | |
ec7ff5ba ZJS |
205 | /* |
206 | * How many columns do we need to show this number in decimal? | |
207 | */ | |
d306f3d3 | 208 | int decimal_width(uintmax_t number) |
ec7ff5ba | 209 | { |
d306f3d3 | 210 | int width; |
ec7ff5ba | 211 | |
d306f3d3 JK |
212 | for (width = 1; number >= 10; width++) |
213 | number /= 10; | |
ec7ff5ba ZJS |
214 | return width; |
215 | } | |
4914c962 | 216 | |
6a1e1bc0 JK |
217 | struct pager_command_config_data { |
218 | const char *cmd; | |
219 | int want; | |
220 | char *value; | |
221 | }; | |
222 | ||
223 | static int pager_command_config(const char *var, const char *value, void *vdata) | |
4914c962 | 224 | { |
6a1e1bc0 JK |
225 | struct pager_command_config_data *data = vdata; |
226 | const char *cmd; | |
227 | ||
228 | if (skip_prefix(var, "pager.", &cmd) && !strcmp(cmd, data->cmd)) { | |
229 | int b = git_config_maybe_bool(var, value); | |
4914c962 | 230 | if (b >= 0) |
6a1e1bc0 | 231 | data->want = b; |
4914c962 | 232 | else { |
6a1e1bc0 JK |
233 | data->want = 1; |
234 | data->value = xstrdup(value); | |
4914c962 NTND |
235 | } |
236 | } | |
6a1e1bc0 JK |
237 | |
238 | return 0; | |
239 | } | |
240 | ||
241 | /* returns 0 for "no pager", 1 for "use pager", and -1 for "not specified" */ | |
242 | int check_pager_config(const char *cmd) | |
243 | { | |
244 | struct pager_command_config_data data; | |
245 | ||
246 | data.cmd = cmd; | |
247 | data.want = -1; | |
248 | data.value = NULL; | |
249 | ||
eed27072 | 250 | read_early_config(pager_command_config, &data); |
6a1e1bc0 JK |
251 | |
252 | if (data.value) | |
253 | pager_program = data.value; | |
254 | return data.want; | |
4914c962 | 255 | } |