| #include "cache.h" |
| #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. |
| */ |
| |
| #ifndef WIN32 |
| static void pager_preexec(void) |
| { |
| /* |
| * 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); |
| /* signal EOF to pager */ |
| close(1); |
| close(2); |
| finish_command(&pager_process); |
| } |
| |
| static void wait_for_pager_signal(int signo) |
| { |
| wait_for_pager(); |
| sigchain_pop(signo); |
| raise(signo); |
| } |
| |
| const char *git_pager(int stdout_is_tty) |
| { |
| const char *pager; |
| |
| if (!stdout_is_tty) |
| return NULL; |
| |
| pager = getenv("GIT_PAGER"); |
| if (!pager) { |
| if (!pager_program) |
| git_config(git_default_config, NULL); |
| pager = pager_program; |
| } |
| if (!pager) |
| pager = getenv("PAGER"); |
| if (!pager) |
| 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; |
| |
| /* |
| * 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; |
| 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 |
| if (start_command(&pager_process)) |
| return; |
| |
| /* original process continues, but writes to the pipe */ |
| dup2(pager_process.in, 1); |
| if (isatty(2)) |
| dup2(pager_process.in, 2); |
| close(pager_process.in); |
| |
| /* this makes sure that the parent terminates after the pager */ |
| sigchain_push_common(wait_for_pager_signal); |
| atexit(wait_for_pager); |
| } |
| |
| int pager_in_use(void) |
| { |
| const char *env; |
| 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; |
| } |