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bfdd9ffd2f
Since we have neither fork() nor exec(), we have to spawn the pager and feed it with the program's output. Signed-off-by: Johannes Sixt <johannes.sixt@telecom.at>
123 lines
2.1 KiB
C
123 lines
2.1 KiB
C
#include "cache.h"
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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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static int spawned_pager;
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#ifndef __MINGW32__
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static void run_pager(const char *pager)
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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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execlp(pager, pager, NULL);
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execl("/bin/sh", "sh", "-c", pager, NULL);
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}
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#else
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#include "run-command.h"
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static const char *pager_argv[] = { "sh", "-c", NULL, NULL };
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static struct child_process pager_process = {
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.argv = pager_argv,
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.in = -1
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};
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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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#endif
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void setup_pager(void)
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{
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#ifndef __MINGW32__
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pid_t pid;
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int fd[2];
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#endif
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const char *pager = getenv("GIT_PAGER");
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if (!isatty(1))
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return;
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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 = "less";
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else if (!*pager || !strcmp(pager, "cat"))
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return;
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spawned_pager = 1; /* means we are emitting to terminal */
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#ifndef __MINGW32__
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if (pipe(fd) < 0)
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return;
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pid = fork();
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if (pid < 0) {
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close(fd[0]);
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close(fd[1]);
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return;
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}
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/* return in the child */
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if (!pid) {
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dup2(fd[1], 1);
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dup2(fd[1], 2);
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close(fd[0]);
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close(fd[1]);
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return;
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}
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/* The original process turns into the PAGER */
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dup2(fd[0], 0);
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close(fd[0]);
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close(fd[1]);
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setenv("LESS", "FRSX", 0);
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run_pager(pager);
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die("unable to execute pager '%s'", pager);
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exit(255);
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#else
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/* spawn the pager */
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pager_argv[2] = pager;
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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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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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atexit(wait_for_pager);
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#endif
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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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if (spawned_pager)
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return 1;
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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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