92 lines
2.6 KiB
Python
92 lines
2.6 KiB
Python
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'''
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tag_cloud
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===================================
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This plugin generates a tag cloud from available tags
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'''
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from __future__ import unicode_literals
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from collections import defaultdict
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from operator import itemgetter
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import logging
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import math
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import random
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from pelican import signals
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logger = logging.getLogger(__name__)
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def set_default_settings(settings):
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settings.setdefault('TAG_CLOUD_STEPS', 4)
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settings.setdefault('TAG_CLOUD_MAX_ITEMS', 100)
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settings.setdefault('TAG_CLOUD_SORTING', 'random')
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settings.setdefault('TAG_CLOUD_BADGE', False)
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def init_default_config(pelican):
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from pelican.settings import DEFAULT_CONFIG
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set_default_settings(DEFAULT_CONFIG)
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if(pelican):
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set_default_settings(pelican.settings)
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def generate_tag_cloud(generator):
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tag_cloud = defaultdict(int)
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for article in generator.articles:
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for tag in getattr(article, 'tags', []):
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tag_cloud[tag] += 1
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tag_cloud = sorted(tag_cloud.items(), key=itemgetter(1), reverse=True)
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tag_cloud = tag_cloud[:generator.settings.get('TAG_CLOUD_MAX_ITEMS')]
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tags = list(map(itemgetter(1), tag_cloud))
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if tags:
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max_count = tags[0]
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min_count = tags[-1]
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steps = generator.settings.get('TAG_CLOUD_STEPS')
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# calculate word sizes
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def generate_tag(tag, count):
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tag = (
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tag,
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int(math.floor(steps - (steps - 1) * math.log(count - min_count + 1)
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/ (math.log(max_count - min_count + 1) or 1)))
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)
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if generator.settings.get('TAG_CLOUD_BADGE'):
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tag += (count,)
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return tag
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tag_cloud = [
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generate_tag(tag, count)
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for tag, count in tag_cloud
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]
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sorting = generator.settings.get('TAG_CLOUD_SORTING')
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if sorting == 'alphabetically':
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tag_cloud.sort(key=lambda elem: elem[0].name)
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elif sorting == 'alphabetically-rev':
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tag_cloud.sort(key=lambda elem: elem[0].name, reverse=True)
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elif sorting == 'size':
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tag_cloud.sort(key=lambda elem: elem[1])
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elif sorting == 'size-rev':
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tag_cloud.sort(key=lambda elem: elem[1], reverse=True)
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elif sorting == 'random':
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random.shuffle(tag_cloud)
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else:
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logger.warning("setting for TAG_CLOUD_SORTING not recognized: %s, "
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"falling back to 'random'", sorting)
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random.shuffle(tag_cloud)
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# make available in context
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generator.tag_cloud = tag_cloud
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generator._update_context(['tag_cloud'])
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def register():
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signals.initialized.connect(init_default_config)
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signals.article_generator_finalized.connect(generate_tag_cloud)
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