How to display wiki markup in script custom email?

[Goodgame Studios]

I would like to convert wiki markup from custom field (free text) to HTML by the script runner post function - send custom email.

How would the path look like?
Now I have the wiki style:

<% out <<
issue.getCustomFieldValue(componentManager.getCustomFieldManager().getCustomFieldObjectByName("Expected Problems")) %>

2015-08-07_11h51_49.png

2015-08-07_11h51_49.png ‏3 KB

[Goodgame Studios · Accepted solution]

I have resolved this issue 

<% 
def rendererManager = com.atlassian.jira.component.ComponentAccessor.getComponent( com.atlassian.jira.issue.RendererManager.class)
def fieldLayoutItem = com.atlassian.jira.component.ComponentAccessor.getFieldLayoutManager().getFieldLayout(issue).getFieldLayoutItem(componentManager.getCustomFieldManager().getCustomFieldObjectByName("field name"))
def renderer = rendererManager.getRendererForField(fieldLayoutItem)
String desc = renderer.render(issue.getCustomFieldValue(componentManager.getCustomFieldManager().getCustomFieldObjectByName("field name")), null)
%>
<%= desc %>