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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 | /* | |
10 | * This is split up from the rest of git so that we can do | |
11 | * something different on Windows. | |
12 | */ | |
13 | ||
14 | static const char *pager_argv[] = { NULL, NULL }; | |
15 | static struct child_process pager_process = CHILD_PROCESS_INIT; | |
16 | ||
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 | } | |
26 | ||
27 | static void wait_for_pager_signal(int signo) | |
28 | { | |
29 | wait_for_pager(); | |
30 | sigchain_pop(signo); | |
31 | raise(signo); | |
32 | } | |
33 | ||
34 | const char *git_pager(int stdout_is_tty) | |
35 | { | |
36 | const char *pager; | |
37 | ||
38 | if (!stdout_is_tty) | |
39 | return NULL; | |
40 | ||
41 | pager = getenv("GIT_PAGER"); | |
42 | if (!pager) { | |
43 | if (!pager_program) | |
44 | git_config(git_default_config, NULL); | |
45 | pager = pager_program; | |
46 | } | |
47 | if (!pager) | |
48 | pager = getenv("PAGER"); | |
49 | if (!pager) | |
50 | pager = DEFAULT_PAGER; | |
51 | if (!*pager || !strcmp(pager, "cat")) | |
52 | pager = NULL; | |
53 | ||
54 | return pager; | |
55 | } | |
56 | ||
57 | void setup_pager(void) | |
58 | { | |
59 | const char *pager = git_pager(isatty(1)); | |
60 | ||
61 | if (!pager) | |
62 | return; | |
63 | ||
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 | ||
70 | setenv("GIT_PAGER_IN_USE", "true", 1); | |
71 | ||
72 | /* spawn the pager */ | |
73 | pager_argv[0] = pager; | |
74 | pager_process.use_shell = 1; | |
75 | pager_process.argv = pager_argv; | |
76 | pager_process.in = -1; | |
77 | if (!getenv("LESS")) | |
78 | argv_array_push(&pager_process.env_array, "LESS=FRX"); | |
79 | if (!getenv("LV")) | |
80 | argv_array_push(&pager_process.env_array, "LV=-c"); | |
81 | if (start_command(&pager_process)) | |
82 | return; | |
83 | ||
84 | /* original process continues, but writes to the pipe */ | |
85 | dup2(pager_process.in, 1); | |
86 | if (isatty(2)) | |
87 | dup2(pager_process.in, 2); | |
88 | close(pager_process.in); | |
89 | ||
90 | /* this makes sure that the parent terminates after the pager */ | |
91 | sigchain_push_common(wait_for_pager_signal); | |
92 | atexit(wait_for_pager); | |
93 | } | |
94 | ||
95 | int pager_in_use(void) | |
96 | { | |
97 | const char *env; | |
98 | env = getenv("GIT_PAGER_IN_USE"); | |
99 | return env ? git_config_bool("GIT_PAGER_IN_USE", env) : 0; | |
100 | } | |
101 | ||
102 | /* | |
103 | * Return cached value (if set) or $COLUMNS environment variable (if | |
104 | * set and positive) or ioctl(1, TIOCGWINSZ).ws_col (if positive), | |
105 | * and default to 80 if all else fails. | |
106 | */ | |
107 | int term_columns(void) | |
108 | { | |
109 | static int term_columns_at_startup; | |
110 | ||
111 | char *col_string; | |
112 | int n_cols; | |
113 | ||
114 | if (term_columns_at_startup) | |
115 | return term_columns_at_startup; | |
116 | ||
117 | term_columns_at_startup = 80; | |
118 | ||
119 | col_string = getenv("COLUMNS"); | |
120 | if (col_string && (n_cols = atoi(col_string)) > 0) | |
121 | term_columns_at_startup = n_cols; | |
122 | #ifdef TIOCGWINSZ | |
123 | else { | |
124 | struct winsize ws; | |
125 | if (!ioctl(1, TIOCGWINSZ, &ws) && ws.ws_col) | |
126 | term_columns_at_startup = ws.ws_col; | |
127 | } | |
128 | #endif | |
129 | ||
130 | return term_columns_at_startup; | |
131 | } | |
132 | ||
133 | /* | |
134 | * How many columns do we need to show this number in decimal? | |
135 | */ | |
136 | int decimal_width(uintmax_t number) | |
137 | { | |
138 | int width; | |
139 | ||
140 | for (width = 1; number >= 10; width++) | |
141 | number /= 10; | |
142 | return width; | |
143 | } | |
144 | ||
145 | /* returns 0 for "no pager", 1 for "use pager", and -1 for "not specified" */ | |
146 | int check_pager_config(const char *cmd) | |
147 | { | |
148 | int want = -1; | |
149 | struct strbuf key = STRBUF_INIT; | |
150 | const char *value = NULL; | |
151 | strbuf_addf(&key, "pager.%s", cmd); | |
152 | if (!git_config_get_value(key.buf, &value)) { | |
153 | int b = git_config_maybe_bool(key.buf, value); | |
154 | if (b >= 0) | |
155 | want = b; | |
156 | else { | |
157 | want = 1; | |
158 | pager_program = xstrdup(value); | |
159 | } | |
160 | } | |
161 | strbuf_release(&key); | |
162 | return want; | |
163 | } |