| #include "cache.h" |
| #include "config.h" |
| #include "run-command.h" |
| #include "sigchain.h" |
| #include "alias.h" |
| |
| #ifndef DEFAULT_PAGER |
| #define DEFAULT_PAGER "less" |
| #endif |
| |
| static struct child_process pager_process; |
| static const char *pager_program; |
| |
| /* Is the value coming back from term_columns() just a guess? */ |
| static int term_columns_guessed; |
| |
| |
| static void close_pager_fds(void) |
| { |
| /* signal EOF to pager */ |
| close(1); |
| close(2); |
| } |
| |
| static void wait_for_pager_atexit(void) |
| { |
| fflush(stdout); |
| fflush(stderr); |
| close_pager_fds(); |
| finish_command(&pager_process); |
| } |
| |
| static void wait_for_pager_signal(int signo) |
| { |
| close_pager_fds(); |
| finish_command_in_signal(&pager_process); |
| 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; |
| |
| if (!stdout_is_tty) |
| return NULL; |
| |
| pager = getenv("GIT_PAGER"); |
| if (!pager) { |
| if (!pager_program) |
| read_early_config(core_pager_config, NULL); |
| pager = pager_program; |
| } |
| if (!pager) |
| pager = getenv("PAGER"); |
| if (!pager) |
| pager = DEFAULT_PAGER; |
| if (!*pager || !strcmp(pager, "cat")) |
| pager = NULL; |
| |
| return pager; |
| } |
| |
| static void setup_pager_env(struct strvec *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 = '='; |
| strvec_push(env, argv[i]); |
| } |
| } |
| free(pager_env); |
| free(argv); |
| } |
| |
| void prepare_pager_args(struct child_process *pager_process, const char *pager) |
| { |
| strvec_push(&pager_process->args, pager); |
| pager_process->use_shell = 1; |
| setup_pager_env(&pager_process->env_array); |
| pager_process->trace2_child_class = "pager"; |
| } |
| |
| void setup_pager(void) |
| { |
| const char *pager = git_pager(isatty(1)); |
| |
| if (!pager) |
| return; |
| |
| /* |
| * After we redirect standard output, we won't be able to use an ioctl |
| * to get the terminal size. Let's grab it now, and then set $COLUMNS |
| * to communicate it to any sub-processes. |
| */ |
| { |
| char buf[64]; |
| xsnprintf(buf, sizeof(buf), "%d", term_columns()); |
| if (!term_columns_guessed) |
| setenv("COLUMNS", buf, 0); |
| } |
| |
| setenv("GIT_PAGER_IN_USE", "true", 1); |
| |
| child_process_init(&pager_process); |
| |
| /* spawn the pager */ |
| prepare_pager_args(&pager_process, pager); |
| pager_process.in = -1; |
| strvec_push(&pager_process.env_array, "GIT_PAGER_IN_USE"); |
| 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_atexit); |
| } |
| |
| int pager_in_use(void) |
| { |
| 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; |
| term_columns_guessed = 1; |
| |
| col_string = getenv("COLUMNS"); |
| if (col_string && (n_cols = atoi(col_string)) > 0) { |
| term_columns_at_startup = n_cols; |
| term_columns_guessed = 0; |
| } |
| #ifdef TIOCGWINSZ |
| else { |
| struct winsize ws; |
| if (!ioctl(1, TIOCGWINSZ, &ws) && ws.ws_col) { |
| term_columns_at_startup = ws.ws_col; |
| term_columns_guessed = 0; |
| } |
| } |
| #endif |
| |
| return term_columns_at_startup; |
| } |
| |
| /* |
| * Clear the entire line, leave cursor in first column. |
| */ |
| void term_clear_line(void) |
| { |
| if (is_terminal_dumb()) |
| /* |
| * Fall back to print a terminal width worth of space |
| * characters (hoping that the terminal is still as wide |
| * as it was upon the first call to term_columns()). |
| */ |
| fprintf(stderr, "\r%*s\r", term_columns(), ""); |
| else |
| /* |
| * On non-dumb terminals use an escape sequence to clear |
| * the whole line, no matter how wide the terminal. |
| */ |
| fputs("\r\033[K", stderr); |
| } |
| |
| /* |
| * 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; |
| |
| read_early_config(pager_command_config, &data); |
| |
| if (data.value) |
| pager_program = data.value; |
| return data.want; |
| } |