diff options
Diffstat (limited to 'pager.c')
| -rw-r--r-- | pager.c | 201 |
1 files changed, 153 insertions, 48 deletions
@@ -1,4 +1,5 @@ #include "cache.h" +#include "config.h" #include "run-command.h" #include "sigchain.h" @@ -6,48 +7,43 @@ #define DEFAULT_PAGER "less" #endif -/* - * This is split up from the rest of git so that we can do - * something different on Windows. - */ +static struct child_process pager_process = CHILD_PROCESS_INIT; +static const char *pager_program; -static int spawned_pager; - -#ifndef WIN32 -static void pager_preexec(void) +static void wait_for_pager(int in_signal) { - /* - * Work around bug in "less" by not starting it until we - * have real input - */ - fd_set in; - - FD_ZERO(&in); - FD_SET(0, &in); - select(1, &in, NULL, &in, NULL); -} -#endif - -static const char *pager_argv[] = { NULL, NULL }; -static struct child_process pager_process; - -static void wait_for_pager(void) -{ - fflush(stdout); - fflush(stderr); + if (!in_signal) { + fflush(stdout); + fflush(stderr); + } /* signal EOF to pager */ close(1); close(2); - finish_command(&pager_process); + if (in_signal) + finish_command_in_signal(&pager_process); + else + finish_command(&pager_process); +} + +static void wait_for_pager_atexit(void) +{ + wait_for_pager(0); } static void wait_for_pager_signal(int signo) { - wait_for_pager(); + wait_for_pager(1); sigchain_pop(signo); raise(signo); } +static int core_pager_config(const char *var, const char *value, void *data) +{ + if (!strcmp(var, "core.pager")) + return git_config_string(&pager_program, var, value); + return 0; +} + const char *git_pager(int stdout_is_tty) { const char *pager; @@ -58,19 +54,53 @@ const char *git_pager(int stdout_is_tty) pager = getenv("GIT_PAGER"); if (!pager) { if (!pager_program) - git_config(git_default_config, NULL); + read_early_config(core_pager_config, NULL); pager = pager_program; } if (!pager) pager = getenv("PAGER"); if (!pager) pager = DEFAULT_PAGER; - else if (!*pager || !strcmp(pager, "cat")) + if (!*pager || !strcmp(pager, "cat")) pager = NULL; return pager; } +static void setup_pager_env(struct argv_array *env) +{ + const char **argv; + int i; + char *pager_env = xstrdup(PAGER_ENV); + int n = split_cmdline(pager_env, &argv); + + if (n < 0) + die("malformed build-time PAGER_ENV: %s", + split_cmdline_strerror(n)); + + for (i = 0; i < n; i++) { + char *cp = strchr(argv[i], '='); + + if (!cp) + die("malformed build-time PAGER_ENV"); + + *cp = '\0'; + if (!getenv(argv[i])) { + *cp = '='; + argv_array_push(env, argv[i]); + } + } + free(pager_env); + free(argv); +} + +void prepare_pager_args(struct child_process *pager_process, const char *pager) +{ + argv_array_push(&pager_process->args, pager); + pager_process->use_shell = 1; + setup_pager_env(&pager_process->env_array); +} + void setup_pager(void) { const char *pager = git_pager(isatty(1)); @@ -78,20 +108,18 @@ void setup_pager(void) if (!pager) return; - spawned_pager = 1; /* means we are emitting to terminal */ + /* + * force computing the width of the terminal before we redirect + * the standard output to the pager. + */ + (void) term_columns(); + + setenv("GIT_PAGER_IN_USE", "true", 1); /* spawn the pager */ - pager_argv[0] = pager; - pager_process.use_shell = 1; - pager_process.argv = pager_argv; + prepare_pager_args(&pager_process, pager); pager_process.in = -1; - if (!getenv("LESS")) { - static const char *env[] = { "LESS=FRSX", NULL }; - pager_process.env = env; - } -#ifndef WIN32 - pager_process.preexec_cb = pager_preexec; -#endif + argv_array_push(&pager_process.env_array, "GIT_PAGER_IN_USE"); if (start_command(&pager_process)) return; @@ -103,16 +131,93 @@ void setup_pager(void) /* this makes sure that the parent terminates after the pager */ sigchain_push_common(wait_for_pager_signal); - atexit(wait_for_pager); + atexit(wait_for_pager_atexit); } int pager_in_use(void) { - const char *env; + return git_env_bool("GIT_PAGER_IN_USE", 0); +} + +/* + * Return cached value (if set) or $COLUMNS environment variable (if + * set and positive) or ioctl(1, TIOCGWINSZ).ws_col (if positive), + * and default to 80 if all else fails. + */ +int term_columns(void) +{ + static int term_columns_at_startup; + + char *col_string; + int n_cols; + + if (term_columns_at_startup) + return term_columns_at_startup; + + term_columns_at_startup = 80; + + col_string = getenv("COLUMNS"); + if (col_string && (n_cols = atoi(col_string)) > 0) + term_columns_at_startup = n_cols; +#ifdef TIOCGWINSZ + else { + struct winsize ws; + if (!ioctl(1, TIOCGWINSZ, &ws) && ws.ws_col) + term_columns_at_startup = ws.ws_col; + } +#endif + + return term_columns_at_startup; +} + +/* + * How many columns do we need to show this number in decimal? + */ +int decimal_width(uintmax_t number) +{ + int width; + + for (width = 1; number >= 10; width++) + number /= 10; + return width; +} + +struct pager_command_config_data { + const char *cmd; + int want; + char *value; +}; + +static int pager_command_config(const char *var, const char *value, void *vdata) +{ + struct pager_command_config_data *data = vdata; + const char *cmd; + + if (skip_prefix(var, "pager.", &cmd) && !strcmp(cmd, data->cmd)) { + int b = git_parse_maybe_bool(value); + if (b >= 0) + data->want = b; + else { + data->want = 1; + data->value = xstrdup(value); + } + } + + return 0; +} + +/* returns 0 for "no pager", 1 for "use pager", and -1 for "not specified" */ +int check_pager_config(const char *cmd) +{ + struct pager_command_config_data data; + + data.cmd = cmd; + data.want = -1; + data.value = NULL; - if (spawned_pager) - return 1; + read_early_config(pager_command_config, &data); - env = getenv("GIT_PAGER_IN_USE"); - return env ? git_config_bool("GIT_PAGER_IN_USE", env) : 0; + if (data.value) + pager_program = data.value; + return data.want; } |