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Jython: Render Wiki Text in Jira

I’m building out a simple template system for our email notifications, so of course I want to support multipart, text and email. But, hey, we have some text fields in JIRA that can take wiki markup, and JIRA will format that on display. So, how do I handle those fields in my text and HTML message attachments?

https://answers.atlassian.com/questions/191567/in-a-jira-script-how-do-i-render-wiki-text-fields
https://answers.atlassian.com/questions/135084/method-to-convert-jira-wiki-format-to-html

So, some sample code to render the custom field “Change Summary” into a pair of strings, change_summary_text and change_summary_html, suitable for inclusion into an email message:

from com.atlassian.event.api import EventPublisher
from com.atlassian.jira import ComponentManager
from com.atlassian.jira.component import ComponentAccessor
from com.atlassian.jira.issue import CustomFieldManager
from com.atlassian.jira.issue.fields import CustomField
from com.atlassian.jira.issue.fields.renderer.wiki import AtlassianWikiRenderer
from com.atlassian.jira.util.velocity import VelocityRequestContextFactory
 
# Get Custom Field
cfm = ComponentManager.getInstance().getCustomFieldManager()
change_summary = issue.getCustomFieldValue(cfm.getCustomFieldObjectByName("Change Summary"))

# Set up Wiki renderer
eventPublisher = ComponentAccessor.getOSGiComponentInstanceOfType(EventPublisher)
velocityRequestContextFactory = ComponentAccessor.getOSGiComponentInstanceOfType(VelocityRequestContextFactory)
wikiRenderer = AtlassianWikiRenderer(eventPublisher, velocityRequestContextFactory)

# Render Custom Field
change_summary_html = wikiRenderer.render(change_summary, None)
change_summary_text = wikiRenderer.renderAsText(change_summary, None)