Andrew's git - gitweb.git/blob

   1#include "cache.h"
   2
   3#include <sys/select.h>
   4
   5/*
   6 * This is split up from the rest of git so that we might do
   7 * something different on Windows, for example.
   8 */
   9
  10static void run_pager(const char *pager)
  11{
  12        /*
  13         * Work around bug in "less" by not starting it until we
  14         * have real input
  15         */
  16        fd_set in;
  17
  18        FD_ZERO(&in);
  19        FD_SET(0, &in);
  20        select(1, &in, NULL, &in, NULL);
  21
  22        execlp(pager, pager, NULL);
  23        execl("/bin/sh", "sh", "-c", pager, NULL);
  24}
  25
  26void setup_pager(void)
  27{
  28        pid_t pid;
  29        int fd[2];
  30        const char *pager = getenv("GIT_PAGER");
  31
  32        if (!isatty(1))
  33                return;
  34        if (!pager)
  35                pager = getenv("PAGER");
  36        if (!pager)
  37                pager = "less";
  38        else if (!*pager || !strcmp(pager, "cat"))
  39                return;
  40
  41        pager_in_use = 1; /* means we are emitting to terminal */
  42
  43        if (pipe(fd) < 0)
  44                return;
  45        pid = fork();
  46        if (pid < 0) {
  47                close(fd[0]);
  48                close(fd[1]);
  49                return;
  50        }
  51
  52        /* return in the child */
  53        if (!pid) {
  54                dup2(fd[1], 1);
  55                close(fd[0]);
  56                close(fd[1]);
  57                return;
  58        }
  59
  60        /* The original process turns into the PAGER */
  61        dup2(fd[0], 0);
  62        close(fd[0]);
  63        close(fd[1]);
  64
  65        setenv("LESS", "FRSX", 0);
  66        run_pager(pager);
  67        die("unable to execute pager '%s'", pager);
  68        exit(255);
  69}