added doku_hasTextBeenModified, rename doku_checkSummary

checkfunc is mainly replaced by doku_hasTextBeenModified, which is put
in  global scope to allow overriding by plugins.

lib/scripts/edit.js

@@ -187,6 +187,10 @@ function currentHeadlineLevel(textboxId){
  */
 window.textChanged = false;
 
+/**
+ * global var which stores original editor content
+ */
+window.doku_edit_text_content = '';
 /**
  * Delete the draft before leaving the page
  */
@@ -236,22 +240,17 @@ jQuery(function () {
         DWsetSelection(sel);
         $edit_text.focus();
 
-        var edit_text_content = $edit_text.val();
+        doku_edit_text_content = $edit_text.val();
     }
 
-    var checkfunc = function() {
-        //global var textChanged
-        if ($edit_text.length > 0) {
-            textChanged = edit_text_content != $edit_text.val();
-        } else {
-            textChanged = true;
-        }
+    var changeHandler = function() {
+        doku_hasTextBeenModified();
 
-        summaryCheck();
+        doku_summaryCheck();
     };
 
-    $editform.change(checkfunc);
-    $editform.keydown(checkfunc);
+    $editform.change(changeHandler);
+    $editform.keydown(changeHandler);
 
     window.onbeforeunload = function(){
         if(window.textChanged) {
@@ -276,18 +275,33 @@ jQuery(function () {
     );
 
     var $summary = jQuery('#edit__summary');
-    $summary.change(summaryCheck);
-    $summary.keyup(summaryCheck);
+    $summary.change(doku_summaryCheck);
+    $summary.keyup(doku_summaryCheck);
 
-    if (textChanged) summaryCheck();
+    if (textChanged) doku_summaryCheck();
 });
 
+/**
+ * Updates textChanged variable if content of the editor has been modified
+ */
+function doku_hasTextBeenModified() {
+    if (!textChanged) {
+        var $edit_text = jQuery('#wiki__text');
+
+        if ($edit_text.length > 0) {
+            textChanged = doku_edit_text_content != $edit_text.val();
+        } else {
+            textChanged = true;
+        }
+    }
+}
+
 /**
  * Checks if a summary was entered - if not the style is changed
  *
  * @author Andreas Gohr <andi@splitbrain.org>
  */
-function summaryCheck(){
+function doku_summaryCheck(){
     var $sum = jQuery('#edit__summary'),
         missing = $sum.val() === '';
     $sum.toggleClass('missing', missing).toggleClass('edit', !missing);