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1 | #include "cache.h" | |
2 | #include "config.h" | |
3 | #include "run-command.h" | |
4 | #include "sigchain.h" | |
5 | #include "alias.h" | |
6 | ||
7 | #ifndef DEFAULT_PAGER | |
8 | #define DEFAULT_PAGER "less" | |
9 | #endif | |
10 | ||
11 | static struct child_process pager_process = CHILD_PROCESS_INIT; | |
12 | static const char *pager_program; | |
13 | ||
14 | static void wait_for_pager(int in_signal) | |
15 | { | |
16 | if (!in_signal) { | |
17 | fflush(stdout); | |
18 | fflush(stderr); | |
19 | } | |
20 | /* signal EOF to pager */ | |
21 | close(1); | |
22 | close(2); | |
23 | if (in_signal) | |
24 | finish_command_in_signal(&pager_process); | |
25 | else | |
26 | finish_command(&pager_process); | |
27 | } | |
28 | ||
29 | static void wait_for_pager_atexit(void) | |
30 | { | |
31 | wait_for_pager(0); | |
32 | } | |
33 | ||
34 | static void wait_for_pager_signal(int signo) | |
35 | { | |
36 | wait_for_pager(1); | |
37 | sigchain_pop(signo); | |
38 | raise(signo); | |
39 | } | |
40 | ||
41 | static int core_pager_config(const char *var, const char *value, void *data) | |
42 | { | |
43 | if (!strcmp(var, "core.pager")) | |
44 | return git_config_string(&pager_program, var, value); | |
45 | return 0; | |
46 | } | |
47 | ||
48 | const char *git_pager(int stdout_is_tty) | |
49 | { | |
50 | const char *pager; | |
51 | ||
52 | if (!stdout_is_tty) | |
53 | return NULL; | |
54 | ||
55 | pager = getenv("GIT_PAGER"); | |
56 | if (!pager) { | |
57 | if (!pager_program) | |
58 | read_early_config(core_pager_config, NULL); | |
59 | pager = pager_program; | |
60 | } | |
61 | if (!pager) | |
62 | pager = getenv("PAGER"); | |
63 | if (!pager) | |
64 | pager = DEFAULT_PAGER; | |
65 | if (!*pager || !strcmp(pager, "cat")) | |
66 | pager = NULL; | |
67 | ||
68 | return pager; | |
69 | } | |
70 | ||
71 | static void setup_pager_env(struct argv_array *env) | |
72 | { | |
73 | const char **argv; | |
74 | int i; | |
75 | char *pager_env = xstrdup(PAGER_ENV); | |
76 | int n = split_cmdline(pager_env, &argv); | |
77 | ||
78 | if (n < 0) | |
79 | die("malformed build-time PAGER_ENV: %s", | |
80 | split_cmdline_strerror(n)); | |
81 | ||
82 | for (i = 0; i < n; i++) { | |
83 | char *cp = strchr(argv[i], '='); | |
84 | ||
85 | if (!cp) | |
86 | die("malformed build-time PAGER_ENV"); | |
87 | ||
88 | *cp = '\0'; | |
89 | if (!getenv(argv[i])) { | |
90 | *cp = '='; | |
91 | argv_array_push(env, argv[i]); | |
92 | } | |
93 | } | |
94 | free(pager_env); | |
95 | free(argv); | |
96 | } | |
97 | ||
98 | void prepare_pager_args(struct child_process *pager_process, const char *pager) | |
99 | { | |
100 | argv_array_push(&pager_process->args, pager); | |
101 | pager_process->use_shell = 1; | |
102 | setup_pager_env(&pager_process->env_array); | |
103 | pager_process->trace2_child_class = "pager"; | |
104 | } | |
105 | ||
106 | void setup_pager(void) | |
107 | { | |
108 | const char *pager = git_pager(isatty(1)); | |
109 | ||
110 | if (!pager) | |
111 | return; | |
112 | ||
113 | /* | |
114 | * After we redirect standard output, we won't be able to use an ioctl | |
115 | * to get the terminal size. Let's grab it now, and then set $COLUMNS | |
116 | * to communicate it to any sub-processes. | |
117 | */ | |
118 | { | |
119 | char buf[64]; | |
120 | xsnprintf(buf, sizeof(buf), "%d", term_columns()); | |
121 | setenv("COLUMNS", buf, 0); | |
122 | } | |
123 | ||
124 | setenv("GIT_PAGER_IN_USE", "true", 1); | |
125 | ||
126 | /* spawn the pager */ | |
127 | prepare_pager_args(&pager_process, pager); | |
128 | pager_process.in = -1; | |
129 | argv_array_push(&pager_process.env_array, "GIT_PAGER_IN_USE"); | |
130 | if (start_command(&pager_process)) | |
131 | return; | |
132 | ||
133 | /* original process continues, but writes to the pipe */ | |
134 | dup2(pager_process.in, 1); | |
135 | if (isatty(2)) | |
136 | dup2(pager_process.in, 2); | |
137 | close(pager_process.in); | |
138 | ||
139 | /* this makes sure that the parent terminates after the pager */ | |
140 | sigchain_push_common(wait_for_pager_signal); | |
141 | atexit(wait_for_pager_atexit); | |
142 | } | |
143 | ||
144 | int pager_in_use(void) | |
145 | { | |
146 | return git_env_bool("GIT_PAGER_IN_USE", 0); | |
147 | } | |
148 | ||
149 | /* | |
150 | * Return cached value (if set) or $COLUMNS environment variable (if | |
151 | * set and positive) or ioctl(1, TIOCGWINSZ).ws_col (if positive), | |
152 | * and default to 80 if all else fails. | |
153 | */ | |
154 | int term_columns(void) | |
155 | { | |
156 | static int term_columns_at_startup; | |
157 | ||
158 | char *col_string; | |
159 | int n_cols; | |
160 | ||
161 | if (term_columns_at_startup) | |
162 | return term_columns_at_startup; | |
163 | ||
164 | term_columns_at_startup = 80; | |
165 | ||
166 | col_string = getenv("COLUMNS"); | |
167 | if (col_string && (n_cols = atoi(col_string)) > 0) | |
168 | term_columns_at_startup = n_cols; | |
169 | #ifdef TIOCGWINSZ | |
170 | else { | |
171 | struct winsize ws; | |
172 | if (!ioctl(1, TIOCGWINSZ, &ws) && ws.ws_col) | |
173 | term_columns_at_startup = ws.ws_col; | |
174 | } | |
175 | #endif | |
176 | ||
177 | return term_columns_at_startup; | |
178 | } | |
179 | ||
180 | /* | |
181 | * How many columns do we need to show this number in decimal? | |
182 | */ | |
183 | int decimal_width(uintmax_t number) | |
184 | { | |
185 | int width; | |
186 | ||
187 | for (width = 1; number >= 10; width++) | |
188 | number /= 10; | |
189 | return width; | |
190 | } | |
191 | ||
192 | struct pager_command_config_data { | |
193 | const char *cmd; | |
194 | int want; | |
195 | char *value; | |
196 | }; | |
197 | ||
198 | static int pager_command_config(const char *var, const char *value, void *vdata) | |
199 | { | |
200 | struct pager_command_config_data *data = vdata; | |
201 | const char *cmd; | |
202 | ||
203 | if (skip_prefix(var, "pager.", &cmd) && !strcmp(cmd, data->cmd)) { | |
204 | int b = git_parse_maybe_bool(value); | |
205 | if (b >= 0) | |
206 | data->want = b; | |
207 | else { | |
208 | data->want = 1; | |
209 | data->value = xstrdup(value); | |
210 | } | |
211 | } | |
212 | ||
213 | return 0; | |
214 | } | |
215 | ||
216 | /* returns 0 for "no pager", 1 for "use pager", and -1 for "not specified" */ | |
217 | int check_pager_config(const char *cmd) | |
218 | { | |
219 | struct pager_command_config_data data; | |
220 | ||
221 | data.cmd = cmd; | |
222 | data.want = -1; | |
223 | data.value = NULL; | |
224 | ||
225 | read_early_config(pager_command_config, &data); | |
226 | ||
227 | if (data.value) | |
228 | pager_program = data.value; | |
229 | return data.want; | |
230 | } |