diff options
Diffstat (limited to 'pager.c')
-rw-r--r-- | pager.c | 88 |
1 files changed, 74 insertions, 14 deletions
@@ -2,13 +2,15 @@ #include "run-command.h" #include "sigchain.h" +#ifndef DEFAULT_PAGER +#define DEFAULT_PAGER "less" +#endif + /* * This is split up from the rest of git so that we can do * something different on Windows. */ -static int spawned_pager; - #ifndef WIN32 static void pager_preexec(void) { @@ -24,7 +26,7 @@ static void pager_preexec(void) } #endif -static const char *pager_argv[] = { "sh", "-c", NULL, NULL }; +static const char *pager_argv[] = { NULL, NULL }; static struct child_process pager_process; static void wait_for_pager(void) @@ -44,12 +46,14 @@ static void wait_for_pager_signal(int signo) raise(signo); } -void setup_pager(void) +const char *git_pager(int stdout_is_tty) { - const char *pager = getenv("GIT_PAGER"); + const char *pager; - if (!isatty(1)) - return; + if (!stdout_is_tty) + return NULL; + + pager = getenv("GIT_PAGER"); if (!pager) { if (!pager_program) git_config(git_default_config, NULL); @@ -58,14 +62,31 @@ void setup_pager(void) if (!pager) pager = getenv("PAGER"); if (!pager) - pager = "less"; + pager = DEFAULT_PAGER; else if (!*pager || !strcmp(pager, "cat")) + pager = NULL; + + return pager; +} + +void setup_pager(void) +{ + const char *pager = git_pager(isatty(1)); + + 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[2] = pager; + pager_argv[0] = pager; + pager_process.use_shell = 1; pager_process.argv = pager_argv; pager_process.in = -1; if (!getenv("LESS")) { @@ -92,10 +113,49 @@ void setup_pager(void) int pager_in_use(void) { const char *env; - - if (spawned_pager) - return 1; - env = getenv("GIT_PAGER_IN_USE"); return env ? git_config_bool("GIT_PAGER_IN_USE", env) : 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(int number) +{ + int i, width; + + for (width = 1, i = 10; i <= number; width++) + i *= 10; + return width; +} |