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Commit | Line | Data |
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f67b45f8 | 1 | #include "cache.h" |
ea27a18c | 2 | #include "run-command.h" |
a3da8821 | 3 | #include "sigchain.h" |
f67b45f8 | 4 | |
a3d023d0 JH |
5 | #ifndef DEFAULT_PAGER |
6 | #define DEFAULT_PAGER "less" | |
7 | #endif | |
8 | ||
f67b45f8 | 9 | /* |
bfdd9ffd JS |
10 | * This is split up from the rest of git so that we can do |
11 | * something different on Windows. | |
f67b45f8 LT |
12 | */ |
13 | ||
ac0ba18d | 14 | static const char *pager_argv[] = { NULL, NULL }; |
d3180279 | 15 | static struct child_process pager_process = CHILD_PROCESS_INIT; |
ea27a18c | 16 | |
bfdd9ffd JS |
17 | static void wait_for_pager(void) |
18 | { | |
19 | fflush(stdout); | |
20 | fflush(stderr); | |
21 | /* signal EOF to pager */ | |
22 | close(1); | |
23 | close(2); | |
24 | finish_command(&pager_process); | |
25 | } | |
f67b45f8 | 26 | |
a3da8821 JK |
27 | static void wait_for_pager_signal(int signo) |
28 | { | |
29 | wait_for_pager(); | |
30 | sigchain_pop(signo); | |
31 | raise(signo); | |
32 | } | |
33 | ||
64778d24 | 34 | const char *git_pager(int stdout_is_tty) |
f67b45f8 | 35 | { |
63618245 | 36 | const char *pager; |
f67b45f8 | 37 | |
64778d24 | 38 | if (!stdout_is_tty) |
63618245 JN |
39 | return NULL; |
40 | ||
41 | pager = getenv("GIT_PAGER"); | |
cad3a205 JH |
42 | if (!pager) { |
43 | if (!pager_program) | |
ef90d6d4 | 44 | git_config(git_default_config, NULL); |
54adf370 | 45 | pager = pager_program; |
cad3a205 | 46 | } |
c27d205a ML |
47 | if (!pager) |
48 | pager = getenv("PAGER"); | |
402461aa | 49 | if (!pager) |
a3d023d0 | 50 | pager = DEFAULT_PAGER; |
ed016612 | 51 | if (!*pager || !strcmp(pager, "cat")) |
63618245 JN |
52 | pager = NULL; |
53 | ||
54 | return pager; | |
55 | } | |
56 | ||
57 | void setup_pager(void) | |
58 | { | |
64778d24 | 59 | const char *pager = git_pager(isatty(1)); |
63618245 | 60 | |
c0459ca4 | 61 | if (!pager) |
402461aa JS |
62 | return; |
63 | ||
ad6c3739 ZJS |
64 | /* |
65 | * force computing the width of the terminal before we redirect | |
66 | * the standard output to the pager. | |
67 | */ | |
68 | (void) term_columns(); | |
69 | ||
2e6c012e | 70 | setenv("GIT_PAGER_IN_USE", "true", 1); |
85fb65ed | 71 | |
bfdd9ffd | 72 | /* spawn the pager */ |
ac0ba18d JK |
73 | pager_argv[0] = pager; |
74 | pager_process.use_shell = 1; | |
ea27a18c JK |
75 | pager_process.argv = pager_argv; |
76 | pager_process.in = -1; | |
e54c1f2d JN |
77 | if (!getenv("LESS") || !getenv("LV")) { |
78 | static const char *env[3]; | |
79 | int i = 0; | |
80 | ||
81 | if (!getenv("LESS")) | |
b3275838 | 82 | env[i++] = "LESS=FRX"; |
e54c1f2d JN |
83 | if (!getenv("LV")) |
84 | env[i++] = "LV=-c"; | |
85 | env[i] = NULL; | |
25fc1786 JS |
86 | pager_process.env = env; |
87 | } | |
bfdd9ffd JS |
88 | if (start_command(&pager_process)) |
89 | return; | |
90 | ||
91 | /* original process continues, but writes to the pipe */ | |
92 | dup2(pager_process.in, 1); | |
a8335024 JH |
93 | if (isatty(2)) |
94 | dup2(pager_process.in, 2); | |
bfdd9ffd JS |
95 | close(pager_process.in); |
96 | ||
97 | /* this makes sure that the parent terminates after the pager */ | |
a3da8821 | 98 | sigchain_push_common(wait_for_pager_signal); |
bfdd9ffd | 99 | atexit(wait_for_pager); |
f67b45f8 | 100 | } |
6e9af863 JK |
101 | |
102 | int pager_in_use(void) | |
103 | { | |
104 | const char *env; | |
6e9af863 JK |
105 | env = getenv("GIT_PAGER_IN_USE"); |
106 | return env ? git_config_bool("GIT_PAGER_IN_USE", env) : 0; | |
107 | } | |
ad6c3739 ZJS |
108 | |
109 | /* | |
110 | * Return cached value (if set) or $COLUMNS environment variable (if | |
111 | * set and positive) or ioctl(1, TIOCGWINSZ).ws_col (if positive), | |
112 | * and default to 80 if all else fails. | |
113 | */ | |
114 | int term_columns(void) | |
115 | { | |
116 | static int term_columns_at_startup; | |
117 | ||
118 | char *col_string; | |
119 | int n_cols; | |
120 | ||
121 | if (term_columns_at_startup) | |
122 | return term_columns_at_startup; | |
123 | ||
124 | term_columns_at_startup = 80; | |
125 | ||
126 | col_string = getenv("COLUMNS"); | |
127 | if (col_string && (n_cols = atoi(col_string)) > 0) | |
128 | term_columns_at_startup = n_cols; | |
129 | #ifdef TIOCGWINSZ | |
130 | else { | |
131 | struct winsize ws; | |
132 | if (!ioctl(1, TIOCGWINSZ, &ws) && ws.ws_col) | |
133 | term_columns_at_startup = ws.ws_col; | |
134 | } | |
135 | #endif | |
136 | ||
137 | return term_columns_at_startup; | |
138 | } | |
4d9e079e | 139 | |
ec7ff5ba ZJS |
140 | /* |
141 | * How many columns do we need to show this number in decimal? | |
142 | */ | |
143 | int decimal_width(int number) | |
144 | { | |
145 | int i, width; | |
146 | ||
147 | for (width = 1, i = 10; i <= number; width++) | |
148 | i *= 10; | |
149 | return width; | |
150 | } | |
4914c962 | 151 | |
586f414a TA |
152 | /* returns 0 for "no pager", 1 for "use pager", and -1 for "not specified" */ |
153 | int check_pager_config(const char *cmd) | |
4914c962 | 154 | { |
586f414a TA |
155 | int want = -1; |
156 | struct strbuf key = STRBUF_INIT; | |
157 | const char *value = NULL; | |
158 | strbuf_addf(&key, "pager.%s", cmd); | |
159 | if (!git_config_get_value(key.buf, &value)) { | |
160 | int b = git_config_maybe_bool(key.buf, value); | |
4914c962 | 161 | if (b >= 0) |
586f414a | 162 | want = b; |
4914c962 | 163 | else { |
586f414a TA |
164 | want = 1; |
165 | pager_program = xstrdup(value); | |
4914c962 NTND |
166 | } |
167 | } | |
586f414a TA |
168 | strbuf_release(&key); |
169 | return want; | |
4914c962 | 170 | } |