3 #include "run-command.h"
8 #define DEFAULT_PAGER "less"
11 static struct child_process pager_process
= CHILD_PROCESS_INIT
;
12 static const char *pager_program
;
14 static void wait_for_pager(int in_signal
)
20 /* signal EOF to pager */
24 finish_command_in_signal(&pager_process
);
26 finish_command(&pager_process
);
29 static void wait_for_pager_atexit(void)
34 static void wait_for_pager_signal(int signo
)
41 static int core_pager_config(const char *var
, const char *value
, void *data
)
43 if (!strcmp(var
, "core.pager"))
44 return git_config_string(&pager_program
, var
, value
);
48 const char *git_pager(int stdout_is_tty
)
55 pager
= getenv("GIT_PAGER");
58 read_early_config(core_pager_config
, NULL
);
59 pager
= pager_program
;
62 pager
= getenv("PAGER");
64 pager
= DEFAULT_PAGER
;
65 if (!*pager
|| !strcmp(pager
, "cat"))
71 static void setup_pager_env(struct argv_array
*env
)
75 char *pager_env
= xstrdup(PAGER_ENV
);
76 int n
= split_cmdline(pager_env
, &argv
);
79 die("malformed build-time PAGER_ENV: %s",
80 split_cmdline_strerror(n
));
82 for (i
= 0; i
< n
; i
++) {
83 char *cp
= strchr(argv
[i
], '=');
86 die("malformed build-time PAGER_ENV");
89 if (!getenv(argv
[i
])) {
91 argv_array_push(env
, argv
[i
]);
98 void prepare_pager_args(struct child_process
*pager_process
, const char *pager
)
100 argv_array_push(&pager_process
->args
, pager
);
101 pager_process
->use_shell
= 1;
102 setup_pager_env(&pager_process
->env_array
);
105 void setup_pager(void)
107 const char *pager
= git_pager(isatty(1));
113 * force computing the width of the terminal before we redirect
114 * the standard output to the pager.
116 (void) term_columns();
118 setenv("GIT_PAGER_IN_USE", "true", 1);
120 /* spawn the pager */
121 prepare_pager_args(&pager_process
, pager
);
122 pager_process
.in
= -1;
123 argv_array_push(&pager_process
.env_array
, "GIT_PAGER_IN_USE");
124 if (start_command(&pager_process
))
127 /* original process continues, but writes to the pipe */
128 dup2(pager_process
.in
, 1);
130 dup2(pager_process
.in
, 2);
131 close(pager_process
.in
);
133 /* this makes sure that the parent terminates after the pager */
134 sigchain_push_common(wait_for_pager_signal
);
135 atexit(wait_for_pager_atexit
);
138 int pager_in_use(void)
140 return git_env_bool("GIT_PAGER_IN_USE", 0);
144 * Return cached value (if set) or $COLUMNS environment variable (if
145 * set and positive) or ioctl(1, TIOCGWINSZ).ws_col (if positive),
146 * and default to 80 if all else fails.
148 int term_columns(void)
150 static int term_columns_at_startup
;
155 if (term_columns_at_startup
)
156 return term_columns_at_startup
;
158 term_columns_at_startup
= 80;
160 col_string
= getenv("COLUMNS");
161 if (col_string
&& (n_cols
= atoi(col_string
)) > 0)
162 term_columns_at_startup
= n_cols
;
166 if (!ioctl(1, TIOCGWINSZ
, &ws
) && ws
.ws_col
)
167 term_columns_at_startup
= ws
.ws_col
;
171 return term_columns_at_startup
;
175 * How many columns do we need to show this number in decimal?
177 int decimal_width(uintmax_t number
)
181 for (width
= 1; number
>= 10; width
++)
186 struct pager_command_config_data
{
192 static int pager_command_config(const char *var
, const char *value
, void *vdata
)
194 struct pager_command_config_data
*data
= vdata
;
197 if (skip_prefix(var
, "pager.", &cmd
) && !strcmp(cmd
, data
->cmd
)) {
198 int b
= git_parse_maybe_bool(value
);
203 data
->value
= xstrdup(value
);
210 /* returns 0 for "no pager", 1 for "use pager", and -1 for "not specified" */
211 int check_pager_config(const char *cmd
)
213 struct pager_command_config_data data
;
219 read_early_config(pager_command_config
, &data
);
222 pager_program
= data
.value
;