PARMmenu.xml

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

<!--
-->

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

      <!-- External Editor -->
      
      <addScriptItem id="open_external_editor">
			  <label>Edit in External Editor</label>
        <parent>expression_menu</parent>
        <insertAfter>edit_expression</insertAfter>
			  <context>
				  <expression>
  <![CDATA[
try:
  import houdini_external_editor
  return houdini_external_editor.is_valid_parm(kwargs["parms"][0])
except:
  return False]]></expression>
			  </context>
			  <scriptCode>
          <![CDATA[
import houdini_external_editor
reload(houdini_external_editor)
houdini_external_editor.add_watcher(kwargs["parms"][0])]]>
			  </scriptCode>
		  </addScriptItem>

      <!-- Remove watcher -->

      <addScriptItem id="remove_file_watcher">
        <label>Remove File Watcher</label>
        <parent>expression_menu</parent>
        <insertAfter>open_external_editor</insertAfter>
        <context>
          <expression>
            <![CDATA[
try:
  import houdini_external_editor
  return houdini_external_editor.parm_has_watcher(kwargs["parms"][0])
except:
  return False]]>
          </expression>
        </context>
        <scriptCode>
          <![CDATA[
import houdini_external_editor
reload(houdini_external_editor)
houdini_external_editor.remove_file_watched(kwargs["parms"][0])]]>
        </scriptCode>
      </addScriptItem>

    </menu>
</menuDocument>