MainMenuCommon.xml

<?xml version="1.0" encoding="UTF-8"?>

<!--

-->

<mainMenu>
  <!-- menuDocument can only contain 1 menu element, whose id is 
         implicitly "root_menu"
      -->
  <menu>

    <!-- Set external editor -->

    <addScriptItem id="set_external_editor">
      <label>Set External Expressions Editor</label>
      <parent>preferences_submenu</parent>
      <insertAfter>h.prefs_misc</insertAfter>
      <scriptCode>
        <![CDATA[
from HoudiniExprEditor import ParmWatcher
try:
  reload(ParmWatcher)
except NameError:
  from importlib import reload
  reload(ParmWatcher)
ParmWatcher.set_external_editor()]]>
      </scriptCode>
    </addScriptItem>

    <!-- Open session module source watcher -->

    <addScriptItem id="external_python_source_editor">
      <label>External Python Source Editor</label>
      <parent>windows_menu</parent>
      <insertAfter>h.python_source_editor</insertAfter>
      <context>
        <expression>
          <![CDATA[
try:
  from HoudiniExprEditor import ParmWatcher
  return True
except Exception as e:
  return False]]>
        </expression>
      </context>
      <scriptCode>
        <![CDATA[
from HoudiniExprEditor import ParmWatcher
try:
  reload(ParmWatcher)
except NameError:
  from importlib import reload
  reload(ParmWatcher)
ParmWatcher.add_watcher("__temp__python_source_editor", type_="__temp__python_source_editor")]]>
      </scriptCode>
    </addScriptItem>

  </menu>
</mainMenu>