mirror of
https://github.com/git/git
synced 2024-08-27 11:39:22 +00:00
223 lines
4.3 KiB
C
223 lines
4.3 KiB
C
#include "cache.h"
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#include "run-command.h"
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#include "sigchain.h"
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#ifndef DEFAULT_PAGER
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#define DEFAULT_PAGER "less"
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#endif
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static struct child_process pager_process = CHILD_PROCESS_INIT;
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static const char *pager_program;
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static void wait_for_pager(int in_signal)
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{
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if (!in_signal) {
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fflush(stdout);
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fflush(stderr);
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}
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/* signal EOF to pager */
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close(1);
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close(2);
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if (in_signal)
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finish_command_in_signal(&pager_process);
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else
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finish_command(&pager_process);
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}
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static void wait_for_pager_atexit(void)
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{
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wait_for_pager(0);
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}
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static void wait_for_pager_signal(int signo)
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{
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wait_for_pager(1);
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sigchain_pop(signo);
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raise(signo);
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}
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static int core_pager_config(const char *var, const char *value, void *data)
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{
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if (!strcmp(var, "core.pager"))
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return git_config_string(&pager_program, var, value);
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return 0;
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}
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const char *git_pager(int stdout_is_tty)
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{
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const char *pager;
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if (!stdout_is_tty)
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return NULL;
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pager = getenv("GIT_PAGER");
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if (!pager) {
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if (!pager_program)
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read_early_config(core_pager_config, NULL);
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pager = pager_program;
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}
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if (!pager)
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pager = getenv("PAGER");
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if (!pager)
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pager = DEFAULT_PAGER;
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if (!*pager || !strcmp(pager, "cat"))
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pager = NULL;
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return pager;
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}
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static void setup_pager_env(struct argv_array *env)
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{
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const char **argv;
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int i;
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char *pager_env = xstrdup(PAGER_ENV);
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int n = split_cmdline(pager_env, &argv);
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if (n < 0)
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die("malformed build-time PAGER_ENV: %s",
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split_cmdline_strerror(n));
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for (i = 0; i < n; i++) {
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char *cp = strchr(argv[i], '=');
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if (!cp)
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die("malformed build-time PAGER_ENV");
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*cp = '\0';
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if (!getenv(argv[i])) {
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*cp = '=';
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argv_array_push(env, argv[i]);
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}
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}
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free(pager_env);
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free(argv);
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}
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void prepare_pager_args(struct child_process *pager_process, const char *pager)
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{
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argv_array_push(&pager_process->args, pager);
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pager_process->use_shell = 1;
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setup_pager_env(&pager_process->env_array);
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}
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void setup_pager(void)
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{
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const char *pager = git_pager(isatty(1));
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if (!pager)
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return;
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/*
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* force computing the width of the terminal before we redirect
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* the standard output to the pager.
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*/
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(void) term_columns();
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setenv("GIT_PAGER_IN_USE", "true", 1);
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/* spawn the pager */
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prepare_pager_args(&pager_process, pager);
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pager_process.in = -1;
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argv_array_push(&pager_process.env_array, "GIT_PAGER_IN_USE");
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if (start_command(&pager_process))
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return;
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/* original process continues, but writes to the pipe */
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dup2(pager_process.in, 1);
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if (isatty(2))
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dup2(pager_process.in, 2);
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close(pager_process.in);
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/* this makes sure that the parent terminates after the pager */
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sigchain_push_common(wait_for_pager_signal);
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atexit(wait_for_pager_atexit);
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}
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int pager_in_use(void)
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{
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return git_env_bool("GIT_PAGER_IN_USE", 0);
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}
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/*
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* Return cached value (if set) or $COLUMNS environment variable (if
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* set and positive) or ioctl(1, TIOCGWINSZ).ws_col (if positive),
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* and default to 80 if all else fails.
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*/
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int term_columns(void)
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{
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static int term_columns_at_startup;
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char *col_string;
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int n_cols;
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if (term_columns_at_startup)
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return term_columns_at_startup;
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term_columns_at_startup = 80;
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col_string = getenv("COLUMNS");
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if (col_string && (n_cols = atoi(col_string)) > 0)
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term_columns_at_startup = n_cols;
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#ifdef TIOCGWINSZ
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else {
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struct winsize ws;
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if (!ioctl(1, TIOCGWINSZ, &ws) && ws.ws_col)
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term_columns_at_startup = ws.ws_col;
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}
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#endif
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return term_columns_at_startup;
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}
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/*
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* How many columns do we need to show this number in decimal?
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*/
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int decimal_width(uintmax_t number)
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{
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int width;
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for (width = 1; number >= 10; width++)
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number /= 10;
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return width;
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}
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struct pager_command_config_data {
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const char *cmd;
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int want;
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char *value;
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};
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static int pager_command_config(const char *var, const char *value, void *vdata)
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{
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struct pager_command_config_data *data = vdata;
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const char *cmd;
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if (skip_prefix(var, "pager.", &cmd) && !strcmp(cmd, data->cmd)) {
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int b = git_config_maybe_bool(var, value);
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if (b >= 0)
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data->want = b;
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else {
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data->want = 1;
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data->value = xstrdup(value);
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}
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}
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return 0;
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}
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/* returns 0 for "no pager", 1 for "use pager", and -1 for "not specified" */
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int check_pager_config(const char *cmd)
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{
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struct pager_command_config_data data;
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data.cmd = cmd;
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data.want = -1;
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data.value = NULL;
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read_early_config(pager_command_config, &data);
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if (data.value)
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pager_program = data.value;
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return data.want;
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}
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