mod/wiki/ewiki/plugins/patchsaving.php

   1 <?php
   2
   3 /*
   4    This plugin catches concurrent edits of a page, and lets the 'patch'
   5    and 'diff' utilities try to merge the different versions. This will
   6    often prevent the "This page version was already saved by someone else"
   7    failure message.
   8    Please use the GNU diff and patch only. Sometimes the unified output
   9    format may be superiour; but this depends on the subjects in your Wiki.
  10 */
  11
  12 define("EWIKI_BIN_DIFF", "/usr/bin/diff");
  13 define("EWIKI_BIN_PATCH", "/usr/bin/patch");
  14
  15 if (function_exists("is_executable") && is_executable(EWIKI_BIN_PATCH) && is_executable(EWIKI_BIN_DIFF)) {
  16   $ewiki_plugins["edit_patch"][] = "ewiki_edit_patch";
  17 }
  18
  19
  20 function ewiki_edit_patch($id, &$data) {
  21
  22    $r = false;
  23
  24    $base = ewiki_database(
  25       "GET",
  26       array("id"=>$id, "version"=>$_REQUEST["version"])
  27    );
  28    if (!$base) {
  29      return(false);
  30    }
  31
  32    $fn_base = EWIKI_TMP."/ewiki.base.".md5($base["content"]);
  33    $fn_requ = EWIKI_TMP."/ewiki..requ.".md5($_REQUEST["content"]);
  34    $fn_patch = EWIKI_TMP."/ewiki.patch.".md5($base["content"])."-".md5($_REQUEST["content"]);
  35    $fn_curr = EWIKI_TMP."/ewiki.curr.".md5($data["content"]);
  36
  37    if ($f = fopen($fn_base, "w")) {
  38      fwrite($f, $base["content"]);
  39      fclose($f);
  40    }
  41    else {
  42      return(false);
  43    }
  44
  45    if ($f = fopen($fn_requ, "w")) {
  46      fwrite($f, $_REQUEST["content"]);
  47      fclose($f);
  48    }
  49    else {
  50      unlink($fn_base);
  51      return(false);
  52    }
  53
  54    if ($f = fopen($fn_curr, "w")) {
  55      fwrite($f, $data["content"]);
  56      fclose($f);
  57    }
  58    else {
  59      unlink($fn_base);
  60      unlink($fn_requ);
  61      return(false);
  62    }
  63
  64    exec("diff -c $fn_base $fn_requ > $fn_patch", $output, $retval);
  65    if ($retval) {
  66
  67       exec("patch $fn_curr $fn_patch", $output, $retval);
  68       if (!$retval) {
  69
  70          $_REQUEST["version"] = $curr["version"];
  71          $_REQUEST["content"] = implode("", file($fn_curr));
  72          $r = true;
  73
  74       }
  75    }
  76
  77    unlink($fn_base);
  78    unlink($fn_requ);
  79    unlink($fn_patch);
  80    unlink($fn_curr);
  81
  82    return($r);
  83 }
  84
  85
  86 ?>