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chromium / external / github.com / git / git / refs/tags/v2.13.4 / . / pager.c
blob: c113d898a4ab184cf5ad5ea04dc66365fdf8a8f8 [file] [log] [blame]
Linus Torvaldsf67b45f2006-02-28 19:26:21[diff] [blame]1#include "cache.h"
Jeff Kingea27a182008-07-22 07:14:12[diff] [blame]2#include "run-command.h"
Jeff Kinga3da8822009-01-22 06:03:28[diff] [blame]3#include "sigchain.h"
Linus Torvaldsf67b45f2006-02-28 19:26:21[diff] [blame]4
Junio C Hamanoa3d023d2009-10-31 01:45:34[diff] [blame]5#ifndef DEFAULT_PAGER
6#define DEFAULT_PAGER "less"
7#endif
8
René Scharfed3180272014-08-19 19:09:35[diff] [blame]9static struct child_process pager_process = CHILD_PROCESS_INIT;
Jeff Kingc0c08892016-09-13 03:23:48[diff] [blame]10static const char *pager_program;
Jeff Kingea27a182008-07-22 07:14:12[diff] [blame]11
Takashi Iwai507d7802015-09-04 09:35:57[diff] [blame]12static void wait_for_pager(int in_signal)
Johannes Sixtbfdd9ff2007-12-08 20:28:41[diff] [blame]13{
Takashi Iwai507d7802015-09-04 09:35:57[diff] [blame]14 if (!in_signal) {
15 fflush(stdout);
16 fflush(stderr);
17 }
Johannes Sixtbfdd9ff2007-12-08 20:28:41[diff] [blame]18 /* signal EOF to pager */
19 close(1);
20 close(2);
Takashi Iwai507d7802015-09-04 09:35:57[diff] [blame]21 if (in_signal)
22 finish_command_in_signal(&pager_process);
23 else
24 finish_command(&pager_process);
25}
26
27static void wait_for_pager_atexit(void)
28{
29 wait_for_pager(0);
Johannes Sixtbfdd9ff2007-12-08 20:28:41[diff] [blame]30}
Linus Torvaldsf67b45f2006-02-28 19:26:21[diff] [blame]31
Jeff Kinga3da8822009-01-22 06:03:28[diff] [blame]32static void wait_for_pager_signal(int signo)
33{
Takashi Iwai507d7802015-09-04 09:35:57[diff] [blame]34 wait_for_pager(1);
Jeff Kinga3da8822009-01-22 06:03:28[diff] [blame]35 sigchain_pop(signo);
36 raise(signo);
37}
38
Jeff King4babb832016-09-13 03:23:44[diff] [blame]39static 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
Jonathan Nieder64778d22010-02-14 11:59:59[diff] [blame]46const char *git_pager(int stdout_is_tty)
Linus Torvaldsf67b45f2006-02-28 19:26:21[diff] [blame]47{
Jonathan Nieder63618242009-10-31 01:41:27[diff] [blame]48 const char *pager;
Linus Torvaldsf67b45f2006-02-28 19:26:21[diff] [blame]49
Jonathan Nieder64778d22010-02-14 11:59:59[diff] [blame]50 if (!stdout_is_tty)
Jonathan Nieder63618242009-10-31 01:41:27[diff] [blame]51 return NULL;
52
53 pager = getenv("GIT_PAGER");
Junio C Hamanocad3a202007-08-07 04:08:43[diff] [blame]54 if (!pager) {
55 if (!pager_program)
Jeff Kingeed27072016-09-13 03:23:56[diff] [blame]56 read_early_config(core_pager_config, NULL);
Brian Gernhardt54adf372007-07-03 18:18:11[diff] [blame]57 pager = pager_program;
Junio C Hamanocad3a202007-08-07 04:08:43[diff] [blame]58 }
Brian Gernhardt54adf372007-07-03 18:18:11[diff] [blame]59 if (!pager)
Matthias Lederhoferc27d2052006-07-31 13:27:00[diff] [blame]60 pager = getenv("PAGER");
61 if (!pager)
Junio C Hamanoa3d023d2009-10-31 01:45:34[diff] [blame]62 pager = DEFAULT_PAGER;
Jeff Kinged016612013-09-03 07:41:50[diff] [blame]63 if (!*pager || !strcmp(pager, "cat"))
Jonathan Nieder63618242009-10-31 01:41:27[diff] [blame]64 pager = NULL;
65
66 return pager;
67}
68
Eric Wong995bc222016-08-04 11:40:25[diff] [blame]69static 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
Junio C Hamano3e3a4a42016-02-16 22:34:44[diff] [blame]96void 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;
Eric Wong995bc222016-08-04 11:40:25[diff] [blame]100 setup_pager_env(&pager_process->env_array);
Junio C Hamano3e3a4a42016-02-16 22:34:44[diff] [blame]101}
102
Jonathan Nieder63618242009-10-31 01:41:27[diff] [blame]103void setup_pager(void)
104{
Jonathan Nieder64778d22010-02-14 11:59:59[diff] [blame]105 const char *pager = git_pager(isatty(1));
Jonathan Nieder63618242009-10-31 01:41:27[diff] [blame]106
Jörn Engelc0459ca2014-04-21 20:46:22[diff] [blame]107 if (!pager)
Johannes Schindelin402461a2006-04-16 02:44:25[diff] [blame]108 return;
109
Zbigniew Jędrzejewski-Szmekad6c3732012-02-12 14:12:32[diff] [blame]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
Jeff King2e6c0122011-08-18 05:02:29[diff] [blame]116 setenv("GIT_PAGER_IN_USE", "true", 1);
Junio C Hamano85fb65e2006-06-06 23:58:40[diff] [blame]117
Johannes Sixtbfdd9ff2007-12-08 20:28:41[diff] [blame]118 /* spawn the pager */
Junio C Hamano3e3a4a42016-02-16 22:34:44[diff] [blame]119 prepare_pager_args(&pager_process, pager);
Jeff Kingea27a182008-07-22 07:14:12[diff] [blame]120 pager_process.in = -1;
Junio C Hamano124b5192015-07-03 17:18:45[diff] [blame]121 argv_array_push(&pager_process.env_array, "GIT_PAGER_IN_USE");
Johannes Sixtbfdd9ff2007-12-08 20:28:41[diff] [blame]122 if (start_command(&pager_process))
123 return;
124
125 /* original process continues, but writes to the pipe */
126 dup2(pager_process.in, 1);
Junio C Hamanoa8335022008-12-15 08:33:34[diff] [blame]127 if (isatty(2))
128 dup2(pager_process.in, 2);
Johannes Sixtbfdd9ff2007-12-08 20:28:41[diff] [blame]129 close(pager_process.in);
130
131 /* this makes sure that the parent terminates after the pager */
Jeff Kinga3da8822009-01-22 06:03:28[diff] [blame]132 sigchain_push_common(wait_for_pager_signal);
Takashi Iwai507d7802015-09-04 09:35:57[diff] [blame]133 atexit(wait_for_pager_atexit);
Linus Torvaldsf67b45f2006-02-28 19:26:21[diff] [blame]134}
Jeff King6e9af862007-12-11 06:27:33[diff] [blame]135
136int pager_in_use(void)
137{
Jeff Kingdf2a6e32017-03-24 18:59:12[diff] [blame]138 return git_env_bool("GIT_PAGER_IN_USE", 0);
Jeff King6e9af862007-12-11 06:27:33[diff] [blame]139}
Zbigniew Jędrzejewski-Szmekad6c3732012-02-12 14:12:32[diff] [blame]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 */
146int 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}
Junio C Hamano4d9e0792012-02-20 08:15:11[diff] [blame]171
172/*
Zbigniew Jędrzejewski-Szmekec7ff5b2012-02-12 14:16:20[diff] [blame]173 * How many columns do we need to show this number in decimal?
174 */
Jeff Kingd306f3d2015-02-05 08:14:19[diff] [blame]175int decimal_width(uintmax_t number)
Zbigniew Jędrzejewski-Szmekec7ff5b2012-02-12 14:16:20[diff] [blame]176{
Jeff Kingd306f3d2015-02-05 08:14:19[diff] [blame]177 int width;
Zbigniew Jędrzejewski-Szmekec7ff5b2012-02-12 14:16:20[diff] [blame]178
Jeff Kingd306f3d2015-02-05 08:14:19[diff] [blame]179 for (width = 1; number >= 10; width++)
180 number /= 10;
Zbigniew Jędrzejewski-Szmekec7ff5b2012-02-12 14:16:20[diff] [blame]181 return width;
182}
Nguyễn Thái Ngọc Duy4914c962012-10-26 15:53:52[diff] [blame]183
Jeff King6a1e1bc2016-09-13 03:23:52[diff] [blame]184struct pager_command_config_data {
185 const char *cmd;
186 int want;
187 char *value;
188};
189
190static 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
Nguyễn Thái Ngọc Duy4914c962012-10-26 15:53:52[diff] [blame]208/* returns 0 for "no pager", 1 for "use pager", and -1 for "not specified" */
209int check_pager_config(const char *cmd)
210{
Jeff King6a1e1bc2016-09-13 03:23:52[diff] [blame]211 struct pager_command_config_data data;
212
213 data.cmd = cmd;
214 data.want = -1;
215 data.value = NULL;
216
Jeff Kingeed27072016-09-13 03:23:56[diff] [blame]217 read_early_config(pager_command_config, &data);
Jeff King6a1e1bc2016-09-13 03:23:52[diff] [blame]218
219 if (data.value)
220 pager_program = data.value;
221 return data.want;
Nguyễn Thái Ngọc Duy4914c962012-10-26 15:53:52[diff] [blame]222}