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("PAGER");
  19
  20        if (!isatty(1))
  21                return;
  22        if (!pager)
  23                pager = "less";
  24        else if (!*pager || !strcmp(pager, "cat"))
  25                return;
  26
  27        pager_in_use = 1; /* means we are emitting to terminal */
  28
  29        if (pipe(fd) < 0)
  30                return;
  31        pid = fork();
  32        if (pid < 0) {
  33                close(fd[0]);
  34                close(fd[1]);
  35                return;
  36        }
  37
  38        /* return in the child */
  39        if (!pid) {
  40                dup2(fd[1], 1);
  41                close(fd[0]);
  42                close(fd[1]);
  43                return;
  44        }
  45
  46        /* The original process turns into the PAGER */
  47        dup2(fd[0], 0);
  48        close(fd[0]);
  49        close(fd[1]);
  50
  51        setenv("LESS", "-RS", 0);
  52        run_pager(pager);
  53        die("unable to execute pager '%s'", pager);
  54        exit(255);
  55}