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Commit | Line | Data |
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f67b45f8 | 1 | #include "cache.h" |
b2141fc1 | 2 | #include "config.h" |
ea27a18c | 3 | #include "run-command.h" |
a3da8821 | 4 | #include "sigchain.h" |
65b5f948 | 5 | #include "alias.h" |
f67b45f8 | 6 | |
a3d023d0 JH |
7 | #ifndef DEFAULT_PAGER |
8 | #define DEFAULT_PAGER "less" | |
9 | #endif | |
10 | ||
d3180279 | 11 | static struct child_process pager_process = CHILD_PROCESS_INIT; |
c0c08897 | 12 | static const char *pager_program; |
ea27a18c | 13 | |
61ff12fa | 14 | static void close_pager_fds(void) |
bfdd9ffd | 15 | { |
bfdd9ffd JS |
16 | /* signal EOF to pager */ |
17 | close(1); | |
18 | close(2); | |
507d7804 TI |
19 | } |
20 | ||
21 | static void wait_for_pager_atexit(void) | |
22 | { | |
61ff12fa ÆAB |
23 | fflush(stdout); |
24 | fflush(stderr); | |
25 | close_pager_fds(); | |
26 | finish_command(&pager_process); | |
bfdd9ffd | 27 | } |
f67b45f8 | 28 | |
a3da8821 JK |
29 | static void wait_for_pager_signal(int signo) |
30 | { | |
61ff12fa ÆAB |
31 | close_pager_fds(); |
32 | finish_command_in_signal(&pager_process); | |
a3da8821 JK |
33 | sigchain_pop(signo); |
34 | raise(signo); | |
35 | } | |
36 | ||
4babb839 JK |
37 | static int core_pager_config(const char *var, const char *value, void *data) |
38 | { | |
39 | if (!strcmp(var, "core.pager")) | |
40 | return git_config_string(&pager_program, var, value); | |
41 | return 0; | |
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) | |
eed27072 | 54 | read_early_config(core_pager_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 | ||
c972bf4c | 67 | static void setup_pager_env(struct strvec *env) |
995bc22d EW |
68 | { |
69 | const char **argv; | |
70 | int i; | |
71 | char *pager_env = xstrdup(PAGER_ENV); | |
72 | int n = split_cmdline(pager_env, &argv); | |
73 | ||
74 | if (n < 0) | |
75 | die("malformed build-time PAGER_ENV: %s", | |
76 | split_cmdline_strerror(n)); | |
77 | ||
78 | for (i = 0; i < n; i++) { | |
79 | char *cp = strchr(argv[i], '='); | |
80 | ||
81 | if (!cp) | |
82 | die("malformed build-time PAGER_ENV"); | |
83 | ||
84 | *cp = '\0'; | |
85 | if (!getenv(argv[i])) { | |
86 | *cp = '='; | |
c972bf4c | 87 | strvec_push(env, argv[i]); |
995bc22d EW |
88 | } |
89 | } | |
90 | free(pager_env); | |
91 | free(argv); | |
92 | } | |
93 | ||
3e3a4a41 JH |
94 | void prepare_pager_args(struct child_process *pager_process, const char *pager) |
95 | { | |
c972bf4c | 96 | strvec_push(&pager_process->args, pager); |
3e3a4a41 | 97 | pager_process->use_shell = 1; |
995bc22d | 98 | setup_pager_env(&pager_process->env_array); |
eee73d1d | 99 | pager_process->trace2_child_class = "pager"; |
3e3a4a41 JH |
100 | } |
101 | ||
63618245 JN |
102 | void setup_pager(void) |
103 | { | |
64778d24 | 104 | const char *pager = git_pager(isatty(1)); |
63618245 | 105 | |
c0459ca4 | 106 | if (!pager) |
402461aa JS |
107 | return; |
108 | ||
ad6c3739 | 109 | /* |
be11f7ad JK |
110 | * After we redirect standard output, we won't be able to use an ioctl |
111 | * to get the terminal size. Let's grab it now, and then set $COLUMNS | |
112 | * to communicate it to any sub-processes. | |
ad6c3739 | 113 | */ |
be11f7ad JK |
114 | { |
115 | char buf[64]; | |
116 | xsnprintf(buf, sizeof(buf), "%d", term_columns()); | |
117 | setenv("COLUMNS", buf, 0); | |
118 | } | |
ad6c3739 | 119 | |
2e6c012e | 120 | setenv("GIT_PAGER_IN_USE", "true", 1); |
85fb65ed | 121 | |
bfdd9ffd | 122 | /* spawn the pager */ |
3e3a4a41 | 123 | prepare_pager_args(&pager_process, pager); |
ea27a18c | 124 | pager_process.in = -1; |
c972bf4c | 125 | strvec_push(&pager_process.env_array, "GIT_PAGER_IN_USE"); |
bfdd9ffd JS |
126 | if (start_command(&pager_process)) |
127 | return; | |
128 | ||
129 | /* original process continues, but writes to the pipe */ | |
130 | dup2(pager_process.in, 1); | |
a8335024 JH |
131 | if (isatty(2)) |
132 | dup2(pager_process.in, 2); | |
bfdd9ffd JS |
133 | close(pager_process.in); |
134 | ||
135 | /* this makes sure that the parent terminates after the pager */ | |
a3da8821 | 136 | sigchain_push_common(wait_for_pager_signal); |
507d7804 | 137 | atexit(wait_for_pager_atexit); |
f67b45f8 | 138 | } |
6e9af863 JK |
139 | |
140 | int pager_in_use(void) | |
141 | { | |
df2a6e38 | 142 | return git_env_bool("GIT_PAGER_IN_USE", 0); |
6e9af863 | 143 | } |
ad6c3739 ZJS |
144 | |
145 | /* | |
146 | * Return cached value (if set) or $COLUMNS environment variable (if | |
147 | * set and positive) or ioctl(1, TIOCGWINSZ).ws_col (if positive), | |
148 | * and default to 80 if all else fails. | |
149 | */ | |
150 | int term_columns(void) | |
151 | { | |
152 | static int term_columns_at_startup; | |
153 | ||
154 | char *col_string; | |
155 | int n_cols; | |
156 | ||
157 | if (term_columns_at_startup) | |
158 | return term_columns_at_startup; | |
159 | ||
160 | term_columns_at_startup = 80; | |
161 | ||
162 | col_string = getenv("COLUMNS"); | |
163 | if (col_string && (n_cols = atoi(col_string)) > 0) | |
164 | term_columns_at_startup = n_cols; | |
165 | #ifdef TIOCGWINSZ | |
166 | else { | |
167 | struct winsize ws; | |
168 | if (!ioctl(1, TIOCGWINSZ, &ws) && ws.ws_col) | |
169 | term_columns_at_startup = ws.ws_col; | |
170 | } | |
171 | #endif | |
172 | ||
173 | return term_columns_at_startup; | |
174 | } | |
4d9e079e | 175 | |
cd1096b2 SG |
176 | /* |
177 | * Clear the entire line, leave cursor in first column. | |
178 | */ | |
179 | void term_clear_line(void) | |
180 | { | |
181 | if (is_terminal_dumb()) | |
182 | /* | |
183 | * Fall back to print a terminal width worth of space | |
184 | * characters (hoping that the terminal is still as wide | |
185 | * as it was upon the first call to term_columns()). | |
186 | */ | |
187 | fprintf(stderr, "\r%*s\r", term_columns(), ""); | |
188 | else | |
189 | /* | |
190 | * On non-dumb terminals use an escape sequence to clear | |
191 | * the whole line, no matter how wide the terminal. | |
192 | */ | |
193 | fputs("\r\033[K", stderr); | |
194 | } | |
195 | ||
ec7ff5ba ZJS |
196 | /* |
197 | * How many columns do we need to show this number in decimal? | |
198 | */ | |
d306f3d3 | 199 | int decimal_width(uintmax_t number) |
ec7ff5ba | 200 | { |
d306f3d3 | 201 | int width; |
ec7ff5ba | 202 | |
d306f3d3 JK |
203 | for (width = 1; number >= 10; width++) |
204 | number /= 10; | |
ec7ff5ba ZJS |
205 | return width; |
206 | } | |
4914c962 | 207 | |
6a1e1bc0 JK |
208 | struct pager_command_config_data { |
209 | const char *cmd; | |
210 | int want; | |
211 | char *value; | |
212 | }; | |
213 | ||
214 | static int pager_command_config(const char *var, const char *value, void *vdata) | |
4914c962 | 215 | { |
6a1e1bc0 JK |
216 | struct pager_command_config_data *data = vdata; |
217 | const char *cmd; | |
218 | ||
219 | if (skip_prefix(var, "pager.", &cmd) && !strcmp(cmd, data->cmd)) { | |
89576613 | 220 | int b = git_parse_maybe_bool(value); |
4914c962 | 221 | if (b >= 0) |
6a1e1bc0 | 222 | data->want = b; |
4914c962 | 223 | else { |
6a1e1bc0 JK |
224 | data->want = 1; |
225 | data->value = xstrdup(value); | |
4914c962 NTND |
226 | } |
227 | } | |
6a1e1bc0 JK |
228 | |
229 | return 0; | |
230 | } | |
231 | ||
232 | /* returns 0 for "no pager", 1 for "use pager", and -1 for "not specified" */ | |
233 | int check_pager_config(const char *cmd) | |
234 | { | |
235 | struct pager_command_config_data data; | |
236 | ||
237 | data.cmd = cmd; | |
238 | data.want = -1; | |
239 | data.value = NULL; | |
240 | ||
eed27072 | 241 | read_early_config(pager_command_config, &data); |
6a1e1bc0 JK |
242 | |
243 | if (data.value) | |
244 | pager_program = data.value; | |
245 | return data.want; | |
4914c962 | 246 | } |