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 = pager_program;
  36        if (!pager)
  37                pager = getenv("PAGER");
  38        if (!pager)
  39                pager = "less";
  40        else if (!*pager || !strcmp(pager, "cat"))
  41                return;
  42
  43        pager_in_use = 1; /* means we are emitting to terminal */
  44
  45        if (pipe(fd) < 0)
  46                return;
  47        pid = fork();
  48        if (pid < 0) {
  49                close(fd[0]);
  50                close(fd[1]);
  51                return;
  52        }
  53
  54        /* return in the child */
  55        if (!pid) {
  56                dup2(fd[1], 1);
  57                close(fd[0]);
  58                close(fd[1]);
  59                return;
  60        }
  61
  62        /* The original process turns into the PAGER */
  63        dup2(fd[0], 0);
  64        close(fd[0]);
  65        close(fd[1]);
  66
  67        setenv("LESS", "FRSX", 0);
  68        run_pager(pager);
  69        die("unable to execute pager '%s'", pager);
  70        exit(255);
  71}