plone.app.discussion/plone/app/discussion/catalog.py

"""Catalog indexers, using plone.indexer. These will populate standard catalog
indexes with values based on the IComment interface.

Also provide event handlers to actually catalog the comments.
"""

from string import split, join

from DateTime import DateTime

from Products.CMFCore.interfaces import IContentish

from Products.ZCatalog.interfaces import IZCatalog

from plone.indexer import indexer

from plone.app.discussion.interfaces import IConversation, IComment


MAX_DESCRIPTION=25

# Conversation Indexers

from plone.indexer.interfaces import IIndexer

@indexer(IContentish, IZCatalog)
def total_comments(object):
    conversation = IConversation(object)
    return conversation.total_comments

@indexer(IContentish, IZCatalog)
def last_comment_date(object):
    conversation = IConversation(object)
    return conversation.last_comment_date

@indexer(IContentish, IZCatalog)
def commentators(object):
    conversation = IConversation(object)
    return tuple(set(conversation.commentators.keys()))

# Comment Indexers

@indexer(IComment)
def title(object):
    return object.title

@indexer(IComment)
def creator(object):
    return object.creator

@indexer(IComment)
def description(object):
    # Return the first 25 words of the comment text and append ' [...]'
    text = join(object.text.split()[:MAX_DESCRIPTION])
    if len(object.text.split()) > 25:
        text += " [...]"
    return text

@indexer(IComment)
def searchable_text(object):
    return object.title, object.text

@indexer(IComment)
def effective(object):
    # the catalog index needs Zope DateTime instead of Python datetime
    # Todo!!!
    return DateTime

@indexer(IComment)
def created(object):
    # the catalog index needs Zope DateTime instead of Python datetime
    return DateTime(object.creation_date.year,
                    object.creation_date.month,
                    object.creation_date.day,
                    object.creation_date.hour,
                    object.creation_date.minute,
                    object.creation_date.second)

@indexer(IComment)
def modified(object):
    # the catalog index needs Zope DateTime instead of Python datetime
    return DateTime(object.modification_date.year,
                    object.modification_date.month,
                    object.modification_date.day,
                    object.modification_date.hour,
                    object.modification_date.minute,
                    object.modification_date.second)