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