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chromium / external / github.com / git / git / refs/tags/v2.0.0-rc0 / . / pager.c
blob: 0cc75a8eee32a0195a74c6819a04745f341e45e3 [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
Nguyį»…n ThĆ”i Ngį»c Duy4914c962012-10-26 15:53:52[diff] [blame]9struct pager_config {
10 const char *cmd;
11 int want;
12 char *value;
13};
14
Linus Torvaldsf67b45f2006-02-28 19:26:21[diff] [blame]15/*
Johannes Sixtbfdd9ff2007-12-08 20:28:41[diff] [blame]16 * This is split up from the rest of git so that we can do
17 * something different on Windows.
Linus Torvaldsf67b45f2006-02-28 19:26:21[diff] [blame]18 */
19
Jeff Kingac0ba182009-12-30 10:53:57[diff] [blame]20static const char *pager_argv[] = { NULL, NULL };
Jeff Kingea27a182008-07-22 07:14:12[diff] [blame]21static struct child_process pager_process;
22
Johannes Sixtbfdd9ff2007-12-08 20:28:41[diff] [blame]23static void wait_for_pager(void)
24{
25 fflush(stdout);
26 fflush(stderr);
27 /* signal EOF to pager */
28 close(1);
29 close(2);
30 finish_command(&pager_process);
31}
Linus Torvaldsf67b45f2006-02-28 19:26:21[diff] [blame]32
Jeff Kinga3da8822009-01-22 06:03:28[diff] [blame]33static void wait_for_pager_signal(int signo)
34{
35 wait_for_pager();
36 sigchain_pop(signo);
37 raise(signo);
38}
39
Jonathan Nieder64778d22010-02-14 11:59:59[diff] [blame]40const char *git_pager(int stdout_is_tty)
Linus Torvaldsf67b45f2006-02-28 19:26:21[diff] [blame]41{
Jonathan Nieder63618242009-10-31 01:41:27[diff] [blame]42 const char *pager;
Linus Torvaldsf67b45f2006-02-28 19:26:21[diff] [blame]43
Jonathan Nieder64778d22010-02-14 11:59:59[diff] [blame]44 if (!stdout_is_tty)
Jonathan Nieder63618242009-10-31 01:41:27[diff] [blame]45 return NULL;
46
47 pager = getenv("GIT_PAGER");
Junio C Hamanocad3a202007-08-07 04:08:43[diff] [blame]48 if (!pager) {
49 if (!pager_program)
Johannes Schindelinef90d6d2008-05-14 17:46:53[diff] [blame]50 git_config(git_default_config, NULL);
Brian Gernhardt54adf372007-07-03 18:18:11[diff] [blame]51 pager = pager_program;
Junio C Hamanocad3a202007-08-07 04:08:43[diff] [blame]52 }
Brian Gernhardt54adf372007-07-03 18:18:11[diff] [blame]53 if (!pager)
Matthias Lederhoferc27d2052006-07-31 13:27:00[diff] [blame]54 pager = getenv("PAGER");
55 if (!pager)
Junio C Hamanoa3d023d2009-10-31 01:45:34[diff] [blame]56 pager = DEFAULT_PAGER;
Jeff Kinged016612013-09-03 07:41:50[diff] [blame]57 if (!*pager || !strcmp(pager, "cat"))
Jonathan Nieder63618242009-10-31 01:41:27[diff] [blame]58 pager = NULL;
59
60 return pager;
61}
62
63void setup_pager(void)
64{
Jonathan Nieder64778d22010-02-14 11:59:59[diff] [blame]65 const char *pager = git_pager(isatty(1));
Jonathan Nieder63618242009-10-31 01:41:27[diff] [blame]66
Nguyį»…n ThĆ”i Ngį»c Duy88e8f902012-04-13 10:54:34[diff] [blame]67 if (!pager || pager_in_use())
Johannes Schindelin402461a2006-04-16 02:44:25[diff] [blame]68 return;
69
Zbigniew Jędrzejewski-Szmekad6c3732012-02-12 14:12:32[diff] [blame]70 /*
71 * force computing the width of the terminal before we redirect
72 * the standard output to the pager.
73 */
74 (void) term_columns();
75
Jeff King2e6c0122011-08-18 05:02:29[diff] [blame]76 setenv("GIT_PAGER_IN_USE", "true", 1);
Junio C Hamano85fb65e2006-06-06 23:58:40[diff] [blame]77
Johannes Sixtbfdd9ff2007-12-08 20:28:41[diff] [blame]78 /* spawn the pager */
Jeff Kingac0ba182009-12-30 10:53:57[diff] [blame]79 pager_argv[0] = pager;
80 pager_process.use_shell = 1;
Jeff Kingea27a182008-07-22 07:14:12[diff] [blame]81 pager_process.argv = pager_argv;
82 pager_process.in = -1;
Jonathan Niedere54c1f22014-01-07 02:14:05[diff] [blame]83 if (!getenv("LESS") || !getenv("LV")) {
84 static const char *env[3];
85 int i = 0;
86
87 if (!getenv("LESS"))
88 env[i++] = "LESS=FRSX";
89 if (!getenv("LV"))
90 env[i++] = "LV=-c";
91 env[i] = NULL;
Johannes Sixt25fc1782009-09-11 17:45:07[diff] [blame]92 pager_process.env = env;
93 }
Johannes Sixtbfdd9ff2007-12-08 20:28:41[diff] [blame]94 if (start_command(&pager_process))
95 return;
96
97 /* original process continues, but writes to the pipe */
98 dup2(pager_process.in, 1);
Junio C Hamanoa8335022008-12-15 08:33:34[diff] [blame]99 if (isatty(2))
100 dup2(pager_process.in, 2);
Johannes Sixtbfdd9ff2007-12-08 20:28:41[diff] [blame]101 close(pager_process.in);
102
103 /* this makes sure that the parent terminates after the pager */
Jeff Kinga3da8822009-01-22 06:03:28[diff] [blame]104 sigchain_push_common(wait_for_pager_signal);
Johannes Sixtbfdd9ff2007-12-08 20:28:41[diff] [blame]105 atexit(wait_for_pager);
Linus Torvaldsf67b45f2006-02-28 19:26:21[diff] [blame]106}
Jeff King6e9af862007-12-11 06:27:33[diff] [blame]107
108int pager_in_use(void)
109{
110 const char *env;
Jeff King6e9af862007-12-11 06:27:33[diff] [blame]111 env = getenv("GIT_PAGER_IN_USE");
112 return env ? git_config_bool("GIT_PAGER_IN_USE", env) : 0;
113}
Zbigniew Jędrzejewski-Szmekad6c3732012-02-12 14:12:32[diff] [blame]114
115/*
116 * Return cached value (if set) or $COLUMNS environment variable (if
117 * set and positive) or ioctl(1, TIOCGWINSZ).ws_col (if positive),
118 * and default to 80 if all else fails.
119 */
120int term_columns(void)
121{
122 static int term_columns_at_startup;
123
124 char *col_string;
125 int n_cols;
126
127 if (term_columns_at_startup)
128 return term_columns_at_startup;
129
130 term_columns_at_startup = 80;
131
132 col_string = getenv("COLUMNS");
133 if (col_string && (n_cols = atoi(col_string)) > 0)
134 term_columns_at_startup = n_cols;
135#ifdef TIOCGWINSZ
136 else {
137 struct winsize ws;
138 if (!ioctl(1, TIOCGWINSZ, &ws) && ws.ws_col)
139 term_columns_at_startup = ws.ws_col;
140 }
141#endif
142
143 return term_columns_at_startup;
144}
Junio C Hamano4d9e0792012-02-20 08:15:11[diff] [blame]145
146/*
Zbigniew Jędrzejewski-Szmekec7ff5b2012-02-12 14:16:20[diff] [blame]147 * How many columns do we need to show this number in decimal?
148 */
149int decimal_width(int number)
150{
151 int i, width;
152
153 for (width = 1, i = 10; i <= number; width++)
154 i *= 10;
155 return width;
156}
Nguyį»…n ThĆ”i Ngį»c Duy4914c962012-10-26 15:53:52[diff] [blame]157
158static int pager_command_config(const char *var, const char *value, void *data)
159{
160 struct pager_config *c = data;
Christian Couder59556542013-11-30 20:55:40[diff] [blame]161 if (starts_with(var, "pager.") && !strcmp(var + 6, c->cmd)) {
Nguyį»…n ThĆ”i Ngį»c Duy4914c962012-10-26 15:53:52[diff] [blame]162 int b = git_config_maybe_bool(var, value);
163 if (b >= 0)
164 c->want = b;
165 else {
166 c->want = 1;
167 c->value = xstrdup(value);
168 }
169 }
170 return 0;
171}
172
173/* returns 0 for "no pager", 1 for "use pager", and -1 for "not specified" */
174int check_pager_config(const char *cmd)
175{
176 struct pager_config c;
177 c.cmd = cmd;
178 c.want = -1;
179 c.value = NULL;
180 git_config(pager_command_config, &c);
181 if (c.value)
182 pager_program = c.value;
183 return c.want;
184}