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<?php
// WebSVN - Subversion repository viewing via the web using PHP
// Copyright (C) 2004-2006 Tim Armes
//
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 2 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
//
// --
//
// diff.php
//
// Show the differences between 2 revisions of a file.
//

require_once("include/setup.php");
require_once("include/svnlook.php");
require_once("include/utils.php");
require_once("include/template.php");

$context = 5;

$vars["action"] = $lang["DIFF"];
$all = (@$_REQUEST["all"] == 1)?1:0;

// Make sure that we have a repository
if (!isset($rep)) {
  echo $lang["NOREP"];
  exit;
}

$svnrep = new SVNRepository($rep);

// If there's no revision info, go to the lastest revision for this path
$history = $svnrep->getLog($path, "", "", true);
$youngest = $history->entries[0]->rev;

if (empty($rev)) {
  $rev = $youngest;
}

$history = $svnrep->getLog($path, $rev);

if ($path{0} != "/") {
  $ppath = "/".$path;
} else {
  $ppath = $path;
}

$prevrev = @$history->entries[1]->rev;

$vars["repname"] = htmlentities($rep->getDisplayName(), ENT_QUOTES, 'UTF-8');
$vars["rev"] = $rev;
$vars["path"] = htmlentities($ppath, ENT_QUOTES, 'UTF-8');
$vars["prevrev"] = $prevrev;

$vars["rev1"] = $history->entries[0]->rev;
$vars["rev2"] = $prevrev;

createDirLinks($rep, $ppath, $rev);

$listing = array();

$url = $config->getURL($rep, $path, "file");
if ($rev != $youngest) {
  $vars["goyoungestlink"] = '<a href="'.$url.'">'.$lang['GOYOUNGEST'].'</a>';
} else {
  $vars["goyoungestlink"] = "";
}

$vars['indexurl'] = $config->getURL($rep, '', 'index');
$vars['repurl'] = $config->getURL($rep, '', 'dir');

$url = $config->getURL($rep, $path, "file");
$vars["filedetaillink"] = "<a href=\"${url}rev=$rev&amp;isdir=0\">${lang["FILEDETAIL"]}</a>";

$url = $config->getURL($rep, $path, "log");
$vars["fileviewloglink"] = "<a href=\"${url}rev=$rev&amp;isdir=0\">${lang["VIEWLOG"]}</a>";

$url = $config->getURL($rep, $path, "diff");
$vars["prevdifflink"] = "<a href=\"${url}rev=$rev\">${lang["DIFFPREV"]}</a>";

$url = $config->getURL($rep, $path, "blame");
$vars["blamelink"] = "<a href=\"${url}rev=$rev\">${lang["BLAME"]}</a>";

if ($prevrev) {
  $url = $config->getURL($rep, $path, "diff");

  if (!$all) {
    $vars["showalllink"] = "<a href=\"${url}rev=$rev&amp;all=1\">${lang["SHOWENTIREFILE"]}</a>";
    $vars["showcompactlink"] = "";
  } else {
    $vars["showcompactlink"] = "<a href=\"${url}rev=$rev&amp;all=0\">${lang["SHOWCOMPACT"]}</a>";
    $vars["showalllink"] = "";
  }

  // Get the contents of the two files
  $newtname = tempnam("temp", "");
  $svnrep->getFileContents($history->entries[0]->path, $newtname, $history->entries[0]->rev, "", true);

  $oldtname = tempnam("temp", "");
  $svnrep->getFileContents($history->entries[1]->path, $oldtname, $history->entries[1]->rev, "", true);

  $ent = true;
  $extension = strrchr(basename($path), ".");
  if (($extension && isset($extEnscript[$extension]) && ('php' == $extEnscript[$extension])) || ($config->useEnscript || $config->useGeshi)) {
    $ent = false;
  }

  if ($all) {
    // Setting the context to 0 makes diff generate the wrong line numbers!
    $context = 1;
  }

  // Open a pipe to the diff command with $context lines of context

  $cmd = quoteCommand($config->diff." -w -U $context \"$oldtname\" \"$newtname\"");

  if ($all) {
    $ofile = fopen($oldtname, "r");
    $nfile = fopen($newtname, "r");
  }

  $descriptorspec = array(0 => array('pipe', 'r'), 1 => array('pipe', 'w'), 2 => array('pipe', 'w'));

  $resource = proc_open($cmd, $descriptorspec, $pipes);
  $error = "";

  if (is_resource($resource)) {
    // We don't need to write
    fclose($pipes[0]);

    $diff = $pipes[1];

    // Ignore the 3 header lines
    $line = fgets($diff);
    $line = fgets($diff);

    // Get the first real line
    $line = fgets($diff);

    $index = 0;
    $listing = array();

    $curoline = 1;
    $curnline = 1;

    while (!feof($diff)) {
      // Get the first line of this range
      sscanf($line, "@@ -%d", $oline);

      $line = substr($line, strpos($line, "+"));
      sscanf($line, "+%d", $nline);

      if ($all) {
        while ($curoline < $oline || $curnline < $nline) {
          $listing[$index]["rev1diffclass"] = "diff";
          $listing[$index]["rev2diffclass"] = "diff";

          if ($curoline < $oline) {
            $nl = fgets($ofile);

            $line = rtrim($nl);
            if ($ent) $line = replaceEntities($line, $rep);

            $listing[$index]["rev1line"] = hardspace($line);

            $curoline++;
          } else {
            $listing[$index]["rev1line"] = "&nbsp;";
          }

          if ($curnline < $nline) {
            $nl = fgets($nfile);

            $line = rtrim($nl);
            if ($ent) $line = replaceEntities($line, $rep);

            $listing[$index]["rev2line"] = hardspace($line);
            $curnline++;
          } else {
            $listing[$index]["rev2line"] = "&nbsp;";
          }

          $listing[$index]["rev1lineno"] = 0;
          $listing[$index]["rev2lineno"] = 0;

          $index++;
        }

      } else {
        // Output the line numbers
        $listing[$index]["rev1lineno"] = $oline;
        $listing[$index]["rev2lineno"] = $nline;
        $index++;
      }

      $fin = false;
      while (!feof($diff) && !$fin) {
        $line = fgets($diff);
        if ($line === false || strncmp($line, "@@", 2) == 0) {
          $fin = true;
        } else {
          $listing[$index]["rev1lineno"] = 0;
          $listing[$index]["rev2lineno"] = 0;

          $mod = $line{0};

          $line = rtrim(substr($line, 1));
          if ($ent) $line = replaceEntities($line, $rep);

          if (strip_tags($line) == '') $line = '&nbsp;';
          $listing[$index]["rev1line"] = hardspace($line);

          $text = hardspace($line);

          switch ($mod) {
            case "-":
              $listing[$index]["rev1diffclass"] = "diffdeleted";
              $listing[$index]["rev2diffclass"] = "diff";

              $listing[$index]["rev1line"] = $text;
              $listing[$index]["rev2line"] = "&nbsp;";

              if ($all) {
                fgets($ofile);
                $curoline++;
              }

              break;

            case "+":
              // Try to mark "changed" line sensibly
              if (!empty($listing[$index-1]) && empty($listing[$index-1]["rev1lineno"]) && @$listing[$index-1]["rev1diffclass"] == "diffdeleted" && @$listing[$index-1]["rev2diffclass"] == "diff") {
                $i = $index - 1;
                while (!empty($listing[$i-1]) && empty($listing[$i-1]["rev1lineno"]) && $listing[$i-1]["rev1diffclass"] == "diffdeleted" && $listing[$i-1]["rev2diffclass"] == "diff") {
                  $i--;
                }

                $listing[$i]["rev1diffclass"] = "diffchanged";
                $listing[$i]["rev2diffclass"] = "diffchanged";
                $listing[$i]["rev2line"] = $text;

                if ($all) {
                  fgets($nfile);
                  $curnline++;
                }

                // Don't increment the current index count
                $index--;

              } else {
                $listing[$index]["rev1diffclass"] = "diff";
                $listing[$index]["rev2diffclass"] = "diffadded";

                $listing[$index]["rev1line"] = "&nbsp;";
                $listing[$index]["rev2line"] = $text;

                if ($all) {
                  fgets($nfile);
                  $curnline++;
                }
              }
              break;

            default:
              $listing[$index]["rev1diffclass"] = "diff";
              $listing[$index]["rev2diffclass"] = "diff";

              $listing[$index]["rev1line"] = $text;
              $listing[$index]["rev2line"] = $text;

              if ($all) {
                fgets($ofile);
                fgets($nfile);
                $curoline++;
                $curnline++;
              }

              break;
          }
        }

        if (!$fin) {
          $index++;
        }
      }
    }

    // Output the rest of the files
    if ($all) {
      while (!feof($ofile) || !feof($nfile)) {
        $listing[$index]["rev1diffclass"] = "diff";
        $listing[$index]["rev2diffclass"] = "diff";

        $line = rtrim(fgets($ofile));
        if ($ent) $line = replaceEntities($line, $rep);

        if (!feof($ofile)) {
          $listing[$index]["rev1line"] = hardspace($line);
        } else {
          $listing[$index]["rev1line"] = "&nbsp;";
        }

        $line = rtrim(fgets($nfile));
        if ($ent) $line = replaceEntities(rtrim(fgets($nfile)), $rep);

        if (!feof($nfile)) {
          $listing[$index]["rev2line"] = hardspace($line);
        } else {
          $listing[$index]["rev2line"] = "&nbsp;";
        }

        $listing[$index]["rev1lineno"] = 0;
        $listing[$index]["rev2lineno"] = 0;

        $index++;
      }
    }

    fclose($pipes[1]);

    while (!feof($pipes[2])) {
      $error .= fgets($pipes[2]);
    }

    $error = toOutputEncoding(trim($error));

    if (!empty($error)) $error = "<p>".$lang['BADCMD'].": <code>".$cmd."</code></p><p>".nl2br($error)."</p>";

    fclose($pipes[2]);

    proc_close($resource);

  } else {
    $error = "<p>".$lang['BADCMD'].": <code>".$cmd."</code></p>";
  }

  if (!empty($error)) {
    echo $error;

    if (is_resource($resource)) {
      fclose($pipes[0]);
      fclose($pipes[1]);
      fclose($pipes[2]);

      proc_close($resource);
    }
    exit;
  }

  if ($all) {
    fclose($ofile);
    fclose($nfile);
  }

  // Remove our temporary files
  @unlink($oldtname);
  @unlink($newtname);

} else {
  $vars["noprev"] = 1;
  $url = $config->getURL($rep, $path, "file");
  $vars["filedetaillink"] = "<a href=\"${url}rev=$rev\">${lang["SHOWENTIREFILE"]}.</a>";
}

$vars["version"] = $version;

if (!$rep->hasReadAccess($path, false)) {
  $vars["noaccess"] = true;
}

parseTemplate($rep->getTemplatePath()."header.tmpl", $vars, $listing);
parseTemplate($rep->getTemplatePath()."diff.tmpl", $vars, $listing);
parseTemplate($rep->getTemplatePath()."footer.tmpl", $vars, $listing);