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        if (pipe(fd) < 0)
  28                return;
  29        pid = fork();
  30        if (pid < 0) {
  31                close(fd[0]);
  32                close(fd[1]);
  33                return;
  34        }
  35
  36        /* return in the child */
  37        if (!pid) {
  38                dup2(fd[1], 1);
  39                close(fd[0]);
  40                close(fd[1]);
  41                return;
  42        }
  43
  44        /* The original process turns into the PAGER */
  45        dup2(fd[0], 0);
  46        close(fd[0]);
  47        close(fd[1]);
  48
  49        setenv("LESS", "-S", 0);
  50        run_pager(pager);
  51        die("unable to execute pager '%s'", pager);
  52        exit(255);
  53}