Index: lib/savepage.php
===================================================================
RCS file: /usr/local/cvsroot/gtmwiki/lib/savepage.php,v
retrieving revision 1.1.1.1
diff -u -r1.1.1.1 savepage.php
--- lib/savepage.php	2001/10/27 15:04:32	1.1.1.1
+++ lib/savepage.php	2001/10/27 16:18:03
@@ -115,6 +115,7 @@
       $pagehash['version'] = 0;
       $pagehash['created'] = time();
       $pagehash['flags'] = 0;
+      $pagehash['content'] = array();
       $newpage = 1;
    } else {
       if (($pagehash['flags'] & FLAG_PAGE_LOCKED) && !defined('WIKI_ADMIN')) {
@@ -135,6 +136,10 @@
       $newpage = 0;
    }
 
+   // store the old name and content, ready for the diff
+   $old_content = join("\n", $pagehash['content']);
+   $old_version = $pagehash['version'];
+
    // set new pageinfo
    $pagehash['lastmodified'] = time();
    $pagehash['version']++;
@@ -188,4 +193,54 @@
    include('lib/transform.php');
 
    GeneratePage('BROWSE', $html, $pagename, $pagehash);
+
+   // all user-visible stuff done; now email me the diff
+   flush();
+
+   $new_content = join("\n", $pagehash['content']);
+   $new_version = $pagehash['version'];   
+
+   $message = $newpage ? "Added:    " : "Modified: ";
+   $message .= "$pagename
+URL:      http://$SERVER_NAME$ScriptUrl?$pagename
+Author:   $remoteuser
+
+===================================================================
+diff -u -r$old_version -r$new_version
+";
+
+   if ($newpage) {
+      $message .= "$new_content\n";
+   }
+   else {
+      $filename_root = "/tmp/phpwiki-"
+		     . ereg_replace("[^[:alnum:]]", "", $pagename);
+
+      $old_fn = "$filename_root.$old_version";
+      $old_fh = fopen($old_fn, "w");
+      if ($old_fh) {
+         fwrite($old_fh, $old_content);
+	 fwrite($old_fh, "\n");
+	 fclose($old_fh);
+      }
+
+      $new_fn = "$filename_root.$new_version";
+      $new_fh = fopen($new_fn, "w");
+      if ($new_fh) {
+         fwrite($new_fh, $new_content);
+	 fwrite($new_fh, "\n");
+         fclose($new_fh);
+      }
+      $message .= `/usr/bin/diff -u $old_fn $new_fn`;
+
+      unlink($old_fn);
+      unlink($new_fn);
+   }
+
+   mail("notify-this-person@this-site.com",
+	"edit: $pagename",
+	$message,
+	"From: PhpWiki <phpwiki@$SERVER_NAME>\n".
+	"X-PhpWiki-Type: edit\n".
+	"X-PhpWiki-Author: $remoteuser");
 ?>