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(void)
21 /* signal EOF to pager */
24 finish_command(&pager_process
);
27 static void wait_for_pager_signal(int signo
)
34 const char *git_pager(int stdout_is_tty
)
41 pager
= getenv("GIT_PAGER");
44 git_config(git_default_config
, NULL
);
45 pager
= pager_program
;
48 pager
= getenv("PAGER");
50 pager
= DEFAULT_PAGER
;
51 if (!*pager
|| !strcmp(pager
, "cat"))
57 void setup_pager(void)
59 const char *pager
= git_pager(isatty(1));
65 * force computing the width of the terminal before we redirect
66 * the standard output to the pager.
68 (void) term_columns();
70 setenv("GIT_PAGER_IN_USE", "true", 1);
73 pager_argv
[0] = pager
;
74 pager_process
.use_shell
= 1;
75 pager_process
.argv
= pager_argv
;
76 pager_process
.in
= -1;
78 argv_array_push(&pager_process
.env_array
, "LESS=FRX");
80 argv_array_push(&pager_process
.env_array
, "LV=-c");
81 argv_array_push(&pager_process
.env_array
, "GIT_PAGER_IN_USE");
82 if (start_command(&pager_process
))
85 /* original process continues, but writes to the pipe */
86 dup2(pager_process
.in
, 1);
88 dup2(pager_process
.in
, 2);
89 close(pager_process
.in
);
91 /* this makes sure that the parent terminates after the pager */
92 sigchain_push_common(wait_for_pager_signal
);
93 atexit(wait_for_pager
);
96 int pager_in_use(void)
99 env
= getenv("GIT_PAGER_IN_USE");
100 return env
? git_config_bool("GIT_PAGER_IN_USE", env
) : 0;
104 * Return cached value (if set) or $COLUMNS environment variable (if
105 * set and positive) or ioctl(1, TIOCGWINSZ).ws_col (if positive),
106 * and default to 80 if all else fails.
108 int term_columns(void)
110 static int term_columns_at_startup
;
115 if (term_columns_at_startup
)
116 return term_columns_at_startup
;
118 term_columns_at_startup
= 80;
120 col_string
= getenv("COLUMNS");
121 if (col_string
&& (n_cols
= atoi(col_string
)) > 0)
122 term_columns_at_startup
= n_cols
;
126 if (!ioctl(1, TIOCGWINSZ
, &ws
) && ws
.ws_col
)
127 term_columns_at_startup
= ws
.ws_col
;
131 return term_columns_at_startup
;
135 * How many columns do we need to show this number in decimal?
137 int decimal_width(int number
)
141 for (width
= 1, i
= 10; i
<= number
; width
++)
146 /* returns 0 for "no pager", 1 for "use pager", and -1 for "not specified" */
147 int check_pager_config(const char *cmd
)
150 struct strbuf key
= STRBUF_INIT
;
151 const char *value
= NULL
;
152 strbuf_addf(&key
, "pager.%s", cmd
);
153 if (!git_config_get_value(key
.buf
, &value
)) {
154 int b
= git_config_maybe_bool(key
.buf
, value
);
159 pager_program
= xstrdup(value
);
162 strbuf_release(&key
);