Andrew's git - gitweb.git/blob

   1#include "cache.h"
   2
   3/*
   4 * This is split up from the rest of git so that we might do
   5 * something different on Windows, for example.
   6 */
   7
   8int pager_in_use;
   9
  10static void run_pager(const char *pager)
  11{
  12        execlp(pager, pager, NULL);
  13        execl("/bin/sh", "sh", "-c", pager, NULL);
  14}
  15
  16void setup_pager(void)
  17{
  18        pid_t pid;
  19        int fd[2];
  20        const char *pager = getenv("PAGER");
  21
  22        if (!isatty(1))
  23                return;
  24        if (!pager)
  25                pager = "less";
  26        else if (!*pager || !strcmp(pager, "cat"))
  27                return;
  28
  29        pager_in_use = 1; /* means we are emitting to terminal */
  30
  31        if (pipe(fd) < 0)
  32                return;
  33        pid = fork();
  34        if (pid < 0) {
  35                close(fd[0]);
  36                close(fd[1]);
  37                return;
  38        }
  39
  40        /* return in the child */
  41        if (!pid) {
  42                dup2(fd[1], 1);
  43                close(fd[0]);
  44                close(fd[1]);
  45                return;
  46        }
  47
  48        /* The original process turns into the PAGER */
  49        dup2(fd[0], 0);
  50        close(fd[0]);
  51        close(fd[1]);
  52
  53        setenv("LESS", "-RS", 0);
  54        run_pager(pager);
  55        die("unable to execute pager '%s'", pager);
  56        exit(255);
  57}