зеркало из https://github.com/microsoft/git.git
150 строки
2.9 KiB
C
150 строки
2.9 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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/*
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* This is split up from the rest of git so that we can do
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* something different on Windows.
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*/
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#ifndef WIN32
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static void pager_preexec(void)
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{
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/*
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* Work around bug in "less" by not starting it until we
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* have real input
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*/
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fd_set in;
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FD_ZERO(&in);
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FD_SET(0, &in);
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select(1, &in, NULL, &in, NULL);
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}
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#endif
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static const char *pager_argv[] = { NULL, NULL };
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static struct child_process pager_process;
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static void wait_for_pager(void)
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{
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fflush(stdout);
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fflush(stderr);
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/* signal EOF to pager */
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close(1);
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close(2);
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finish_command(&pager_process);
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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();
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sigchain_pop(signo);
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raise(signo);
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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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git_config(git_default_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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else 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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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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pager_argv[0] = pager;
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pager_process.use_shell = 1;
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pager_process.argv = pager_argv;
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pager_process.in = -1;
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if (!getenv("LESS")) {
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static const char *env[] = { "LESS=FRSX", NULL };
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pager_process.env = env;
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}
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#ifndef WIN32
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pager_process.preexec_cb = pager_preexec;
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#endif
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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);
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}
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int pager_in_use(void)
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{
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const char *env;
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env = getenv("GIT_PAGER_IN_USE");
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return env ? git_config_bool("GIT_PAGER_IN_USE", env) : 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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