ZODB Components: Add CodeMirror editor.

CodeMirror API is much more cleaner (from code and design point of view) than
Ace Editor and include useful plugins, such as MergeView supported in ERP5 to
diff with previous versions.

product/ERP5/bootstrap/erp5_core/SkinTemplateItem/portal_skins/erp5_core/Component_getTextContentHistoryRevisionDictListAsJSON.xml

+<?xml version="1.0"?>
+<ZopeData>
+  <record id="1" aka="AAAAAAAAAAE=">
+    <pickle>
+      <global name="PythonScript" module="Products.PythonScripts.PythonScript"/>
+    </pickle>
+    <pickle>
+      <dictionary>
+        <item>
+            <key> <string>Script_magic</string> </key>
+            <value> <int>3</int> </value>
+        </item>
+        <item>
+            <key> <string>_bind_names</string> </key>
+            <value>
+              <object>
+                <klass>
+                  <global name="NameAssignments" module="Shared.DC.Scripts.Bindings"/>
+                </klass>
+                <tuple/>
+                <state>
+                  <dictionary>
+                    <item>
+                        <key> <string>_asgns</string> </key>
+                        <value>
+                          <dictionary>
+                            <item>
+                                <key> <string>name_container</string> </key>
+                                <value> <string>container</string> </value>
+                            </item>
+                            <item>
+                                <key> <string>name_context</string> </key>
+                                <value> <string>context</string> </value>
+                            </item>
+                            <item>
+                                <key> <string>name_m_self</string> </key>
+                                <value> <string>script</string> </value>
+                            </item>
+                            <item>
+                                <key> <string>name_subpath</string> </key>
+                                <value> <string>traverse_subpath</string> </value>
+                            </item>
+                          </dictionary>
+                        </value>
+                    </item>
+                  </dictionary>
+                </state>
+              </object>
+            </value>
+        </item>
+        <item>
+            <key> <string>_body</string> </key>
+            <value> <string>import json\n
+return json.dumps(context.getTextContentHistoryRevisionDictList())\n
+</string> </value>
+        </item>
+        <item>
+            <key> <string>_params</string> </key>
+            <value> <string></string> </value>
+        </item>
+        <item>
+            <key> <string>id</string> </key>
+            <value> <string>Component_getTextContentHistoryRevisionDictListAsJSON</string> </value>
+        </item>
+      </dictionary>
+    </pickle>
+  </record>
+</ZopeData>

product/ERP5Form/EditorField.py

@@ -75,7 +75,8 @@ class EditorWidget(Widget.TextAreaWidget):
                                           ('Xinha Editor', 'xinha'),
                                           ('SVG Editor', 'svg_editor'),
                                           ('Spreadsheet Editor', 'spreadsheet_editor'),
-                                          ('Ace Editor', 'ace')])
+                                          ('Ace Editor', 'ace'),
+                                          ('CodeMirror', 'codemirror')])
 
   def render(self, field, key, value, REQUEST, render_prefix=None):
     """
@@ -118,6 +119,14 @@ class EditorWidget(Widget.TextAreaWidget):
         return ace_editor_support.pt_render(extra_context={'field': field,
                                                          'content': value,
                                                          'id': key})
+    elif text_editor == 'codemirror':
+      code_mirror_support = getattr(here, 'code_mirror_support', None)
+      if code_mirror_support is not None:
+        site_root = here.getWebSiteValue() or here.getPortalObject()
+        return code_mirror_support(field=field,
+                                   content=value,
+                                   field_id=key,
+                                   portal_url=site_root.absolute_url())
     elif text_editor != 'text_area':
       return here.fckeditor_wysiwyg_support.pt_render(
            extra_context= {

product/ERP5Type/mixin/component.py

@@ -355,3 +355,47 @@ class ComponentMixin(PropertyRecordableMixin, Base):
     new_component.validate()
 
     return new_component
+
+  security.declareProtected(Permissions.ModifyPortalContent,
+                            'getTextContentHistoryRevisionDictList')
+  def getTextContentHistoryRevisionDictList(self, limit=100):
+    """
+    TODO
+    """
+    history_dict_list = self._p_jar.db().history(self._p_oid, size=limit)
+    if history_dict_list is None:
+      # Storage doesn't support history
+      return ()
+
+    from struct import unpack
+    from OFS.History import historicalRevision
+
+    previous_text_content = None
+    result = []
+    for history_dict in history_dict_list:
+      text_content = historicalRevision(self, history_dict['tid']).getTextContent()
+      if text_content and text_content != previous_text_content:
+        history_dict['time'] = history_dict['time']
+        history_dict['user_name'] = history_dict['user_name'].strip()
+        history_dict['key'] = '.'.join(map(str, unpack(">HHHH", history_dict['tid'])))
+        del history_dict['tid']
+        del history_dict['size']
+
+        result.append(history_dict)
+        previous_text_content = text_content
+
+    return result
+
+  security.declareProtected(Permissions.ModifyPortalContent,
+                            'getTextContentHistory')
+  def getTextContentHistory(self, key):
+    """
+    TODO
+    """
+    from struct import pack
+    from OFS.History import historicalRevision
+
+    serial = apply(pack, ('>HHHH',) + tuple(map(int, key.split('.'))))
+    rev = historicalRevision(self, serial)
+
+    return rev.getTextContent()