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
   8static void run_pager(const char *pager)
   9{
  10        execlp(pager, pager, NULL);
  11        execl("/bin/sh", "sh", "-c", pager, NULL);
  12}
  13
  14void setup_pager(void)
  15{
  16        pid_t pid;
  17        int fd[2];
  18        const char *pager = getenv("GIT_PAGER");
  19
  20        if (!isatty(1))
  21                return;
  22        if (!pager)
  23                pager = getenv("PAGER");
  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}