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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" |
f67b45f8 | 5 | |
a3d023d0 JH |
6 | #ifndef DEFAULT_PAGER |
7 | #define DEFAULT_PAGER "less" | |
8 | #endif | |
9 | ||
d3180279 | 10 | static struct child_process pager_process = CHILD_PROCESS_INIT; |
c0c08897 | 11 | static const char *pager_program; |
ea27a18c | 12 | |
507d7804 | 13 | static void wait_for_pager(int in_signal) |
bfdd9ffd | 14 | { |
507d7804 TI |
15 | if (!in_signal) { |
16 | fflush(stdout); | |
17 | fflush(stderr); | |
18 | } | |
bfdd9ffd JS |
19 | /* signal EOF to pager */ |
20 | close(1); | |
21 | close(2); | |
507d7804 TI |
22 | if (in_signal) |
23 | finish_command_in_signal(&pager_process); | |
24 | else | |
25 | finish_command(&pager_process); | |
26 | } | |
27 | ||
28 | static void wait_for_pager_atexit(void) | |
29 | { | |
30 | wait_for_pager(0); | |
bfdd9ffd | 31 | } |
f67b45f8 | 32 | |
a3da8821 JK |
33 | static void wait_for_pager_signal(int signo) |
34 | { | |
507d7804 | 35 | wait_for_pager(1); |
a3da8821 JK |
36 | sigchain_pop(signo); |
37 | raise(signo); | |
38 | } | |
39 | ||
4babb839 JK |
40 | static int core_pager_config(const char *var, const char *value, void *data) |
41 | { | |
42 | if (!strcmp(var, "core.pager")) | |
43 | return git_config_string(&pager_program, var, value); | |
44 | return 0; | |
45 | } | |
46 | ||
64778d24 | 47 | const char *git_pager(int stdout_is_tty) |
f67b45f8 | 48 | { |
63618245 | 49 | const char *pager; |
f67b45f8 | 50 | |
64778d24 | 51 | if (!stdout_is_tty) |
63618245 JN |
52 | return NULL; |
53 | ||
54 | pager = getenv("GIT_PAGER"); | |
cad3a205 JH |
55 | if (!pager) { |
56 | if (!pager_program) | |
eed27072 | 57 | read_early_config(core_pager_config, NULL); |
54adf370 | 58 | pager = pager_program; |
cad3a205 | 59 | } |
c27d205a ML |
60 | if (!pager) |
61 | pager = getenv("PAGER"); | |
402461aa | 62 | if (!pager) |
a3d023d0 | 63 | pager = DEFAULT_PAGER; |
ed016612 | 64 | if (!*pager || !strcmp(pager, "cat")) |
63618245 JN |
65 | pager = NULL; |
66 | ||
67 | return pager; | |
68 | } | |
69 | ||
995bc22d EW |
70 | static void setup_pager_env(struct argv_array *env) |
71 | { | |
72 | const char **argv; | |
73 | int i; | |
74 | char *pager_env = xstrdup(PAGER_ENV); | |
75 | int n = split_cmdline(pager_env, &argv); | |
76 | ||
77 | if (n < 0) | |
78 | die("malformed build-time PAGER_ENV: %s", | |
79 | split_cmdline_strerror(n)); | |
80 | ||
81 | for (i = 0; i < n; i++) { | |
82 | char *cp = strchr(argv[i], '='); | |
83 | ||
84 | if (!cp) | |
85 | die("malformed build-time PAGER_ENV"); | |
86 | ||
87 | *cp = '\0'; | |
88 | if (!getenv(argv[i])) { | |
89 | *cp = '='; | |
90 | argv_array_push(env, argv[i]); | |
91 | } | |
92 | } | |
93 | free(pager_env); | |
94 | free(argv); | |
95 | } | |
96 | ||
3e3a4a41 JH |
97 | void prepare_pager_args(struct child_process *pager_process, const char *pager) |
98 | { | |
99 | argv_array_push(&pager_process->args, pager); | |
100 | pager_process->use_shell = 1; | |
995bc22d | 101 | setup_pager_env(&pager_process->env_array); |
3e3a4a41 JH |
102 | } |
103 | ||
63618245 JN |
104 | void setup_pager(void) |
105 | { | |
64778d24 | 106 | const char *pager = git_pager(isatty(1)); |
63618245 | 107 | |
c0459ca4 | 108 | if (!pager) |
402461aa JS |
109 | return; |
110 | ||
ad6c3739 | 111 | /* |
be11f7ad JK |
112 | * After we redirect standard output, we won't be able to use an ioctl |
113 | * to get the terminal size. Let's grab it now, and then set $COLUMNS | |
114 | * to communicate it to any sub-processes. | |
ad6c3739 | 115 | */ |
be11f7ad JK |
116 | { |
117 | char buf[64]; | |
118 | xsnprintf(buf, sizeof(buf), "%d", term_columns()); | |
119 | setenv("COLUMNS", buf, 0); | |
120 | } | |
ad6c3739 | 121 | |
2e6c012e | 122 | setenv("GIT_PAGER_IN_USE", "true", 1); |
85fb65ed | 123 | |
bfdd9ffd | 124 | /* spawn the pager */ |
3e3a4a41 | 125 | prepare_pager_args(&pager_process, pager); |
ea27a18c | 126 | pager_process.in = -1; |
124b5190 | 127 | argv_array_push(&pager_process.env_array, "GIT_PAGER_IN_USE"); |
bfdd9ffd JS |
128 | if (start_command(&pager_process)) |
129 | return; | |
130 | ||
131 | /* original process continues, but writes to the pipe */ | |
132 | dup2(pager_process.in, 1); | |
a8335024 JH |
133 | if (isatty(2)) |
134 | dup2(pager_process.in, 2); | |
bfdd9ffd JS |
135 | close(pager_process.in); |
136 | ||
137 | /* this makes sure that the parent terminates after the pager */ | |
a3da8821 | 138 | sigchain_push_common(wait_for_pager_signal); |
507d7804 | 139 | atexit(wait_for_pager_atexit); |
f67b45f8 | 140 | } |
6e9af863 JK |
141 | |
142 | int pager_in_use(void) | |
143 | { | |
df2a6e38 | 144 | return git_env_bool("GIT_PAGER_IN_USE", 0); |
6e9af863 | 145 | } |
ad6c3739 ZJS |
146 | |
147 | /* | |
148 | * Return cached value (if set) or $COLUMNS environment variable (if | |
149 | * set and positive) or ioctl(1, TIOCGWINSZ).ws_col (if positive), | |
150 | * and default to 80 if all else fails. | |
151 | */ | |
152 | int term_columns(void) | |
153 | { | |
154 | static int term_columns_at_startup; | |
155 | ||
156 | char *col_string; | |
157 | int n_cols; | |
158 | ||
159 | if (term_columns_at_startup) | |
160 | return term_columns_at_startup; | |
161 | ||
162 | term_columns_at_startup = 80; | |
163 | ||
164 | col_string = getenv("COLUMNS"); | |
165 | if (col_string && (n_cols = atoi(col_string)) > 0) | |
166 | term_columns_at_startup = n_cols; | |
167 | #ifdef TIOCGWINSZ | |
168 | else { | |
169 | struct winsize ws; | |
170 | if (!ioctl(1, TIOCGWINSZ, &ws) && ws.ws_col) | |
171 | term_columns_at_startup = ws.ws_col; | |
172 | } | |
173 | #endif | |
174 | ||
175 | return term_columns_at_startup; | |
176 | } | |
4d9e079e | 177 | |
ec7ff5ba ZJS |
178 | /* |
179 | * How many columns do we need to show this number in decimal? | |
180 | */ | |
d306f3d3 | 181 | int decimal_width(uintmax_t number) |
ec7ff5ba | 182 | { |
d306f3d3 | 183 | int width; |
ec7ff5ba | 184 | |
d306f3d3 JK |
185 | for (width = 1; number >= 10; width++) |
186 | number /= 10; | |
ec7ff5ba ZJS |
187 | return width; |
188 | } | |
4914c962 | 189 | |
6a1e1bc0 JK |
190 | struct pager_command_config_data { |
191 | const char *cmd; | |
192 | int want; | |
193 | char *value; | |
194 | }; | |
195 | ||
196 | static int pager_command_config(const char *var, const char *value, void *vdata) | |
4914c962 | 197 | { |
6a1e1bc0 JK |
198 | struct pager_command_config_data *data = vdata; |
199 | const char *cmd; | |
200 | ||
201 | if (skip_prefix(var, "pager.", &cmd) && !strcmp(cmd, data->cmd)) { | |
89576613 | 202 | int b = git_parse_maybe_bool(value); |
4914c962 | 203 | if (b >= 0) |
6a1e1bc0 | 204 | data->want = b; |
4914c962 | 205 | else { |
6a1e1bc0 JK |
206 | data->want = 1; |
207 | data->value = xstrdup(value); | |
4914c962 NTND |
208 | } |
209 | } | |
6a1e1bc0 JK |
210 | |
211 | return 0; | |
212 | } | |
213 | ||
214 | /* returns 0 for "no pager", 1 for "use pager", and -1 for "not specified" */ | |
215 | int check_pager_config(const char *cmd) | |
216 | { | |
217 | struct pager_command_config_data data; | |
218 | ||
219 | data.cmd = cmd; | |
220 | data.want = -1; | |
221 | data.value = NULL; | |
222 | ||
eed27072 | 223 | read_early_config(pager_command_config, &data); |
6a1e1bc0 JK |
224 | |
225 | if (data.value) | |
226 | pager_program = data.value; | |
227 | return data.want; | |
4914c962 | 228 | } |