2 #include "run-command.h"
6 #define DEFAULT_PAGER "less"
10 * This is split up from the rest of git so that we can do
11 * something different on Windows.
14 static const char *pager_argv
[] = { NULL
, NULL
};
15 static struct child_process pager_process
= CHILD_PROCESS_INIT
;
17 static void wait_for_pager(int in_signal
)
23 /* signal EOF to pager */
27 finish_command_in_signal(&pager_process
);
29 finish_command(&pager_process
);
32 static void wait_for_pager_atexit(void)
37 static void wait_for_pager_signal(int signo
)
44 const char *git_pager(int stdout_is_tty
)
51 pager
= getenv("GIT_PAGER");
54 git_config(git_default_config
, NULL
);
55 pager
= pager_program
;
58 pager
= getenv("PAGER");
60 pager
= DEFAULT_PAGER
;
61 if (!*pager
|| !strcmp(pager
, "cat"))
67 void setup_pager(void)
69 const char *pager
= git_pager(isatty(1));
76 * force computing the width of the terminal before we redirect
77 * the standard output to the pager.
79 (void) term_columns();
81 setenv("GIT_PAGER_IN_USE", "true", 1);
84 pager_argv
[0] = pager
;
85 pager_process
.argv
= pager_argv
;
87 argv_array_push(&pager_process
.env_array
, "LESS=FRX");
89 argv_array_push(&pager_process
.env_array
, "LV=-c");
90 argv_array_push(&pager_process
.env_array
, "GIT_PAGER_IN_USE");
91 pager_process
.in
= -1;
92 pager_process
.silent_exec_failure
= 1;
93 ret
= start_command(&pager_process
);
94 if (ret
< 0 && errno
== ENOENT
) {
95 pager_process
.use_shell
= 1;
96 pager_process
.in
= -1;
97 pager_process
.silent_exec_failure
= 0;
98 ret
= start_command(&pager_process
);
101 return; /* no pager */
103 /* original process continues, but writes to the pipe */
104 dup2(pager_process
.in
, 1);
106 dup2(pager_process
.in
, 2);
107 close(pager_process
.in
);
109 /* this makes sure that the parent terminates after the pager */
110 sigchain_push_common(wait_for_pager_signal
);
111 atexit(wait_for_pager_atexit
);
114 int pager_in_use(void)
117 env
= getenv("GIT_PAGER_IN_USE");
118 return env
? git_config_bool("GIT_PAGER_IN_USE", env
) : 0;
122 * Return cached value (if set) or $COLUMNS environment variable (if
123 * set and positive) or ioctl(1, TIOCGWINSZ).ws_col (if positive),
124 * and default to 80 if all else fails.
126 int term_columns(void)
128 static int term_columns_at_startup
;
133 if (term_columns_at_startup
)
134 return term_columns_at_startup
;
136 term_columns_at_startup
= 80;
138 col_string
= getenv("COLUMNS");
139 if (col_string
&& (n_cols
= atoi(col_string
)) > 0)
140 term_columns_at_startup
= n_cols
;
144 if (!ioctl(1, TIOCGWINSZ
, &ws
) && ws
.ws_col
)
145 term_columns_at_startup
= ws
.ws_col
;
149 return term_columns_at_startup
;
153 * How many columns do we need to show this number in decimal?
155 int decimal_width(uintmax_t number
)
159 for (width
= 1; number
>= 10; width
++)
164 /* returns 0 for "no pager", 1 for "use pager", and -1 for "not specified" */
165 int check_pager_config(const char *cmd
)
168 struct strbuf key
= STRBUF_INIT
;
169 const char *value
= NULL
;
170 strbuf_addf(&key
, "pager.%s", cmd
);
171 if (git_config_key_is_valid(key
.buf
) &&
172 !git_config_get_value(key
.buf
, &value
)) {
173 int b
= git_config_maybe_bool(key
.buf
, value
);
178 pager_program
= xstrdup(value
);
181 strbuf_release(&key
);