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series/Readme.md

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+Series plugin
+-------------
+
+**NOTE:** [This plugin has been moved to its own repository](https://github.com/pelican-plugins/series). Please file any issues/PRs there. Once all plugins have been migrated to the [new Pelican Plugins organization](https://github.com/pelican-plugins), this monolithic repository will be archived.
+
+The series plugin allows you to join different posts into a series.
+
+In order to mark posts as part of a series, use the `:series:` metadata:
+
+    :series:  NAME_OF_THIS_SERIES
+
+or, in Markdown syntax
+
+    Series: NAME_OF_THIS_SERIES
+
+The plugin collects all articles belonging to the same series and provides
+series-related variables that you can use in your template.
+
+#### Indexing
+By default articles in a series are ordered by date and then automatically numbered.
+
+If you want to force a given order just specify the `:series_index:` metadata or in Markdown `series_index:`,
+starting from 1. All articles with this enforced index are put at the beginning of
+the series and ordered according to the index itself. All the remaining articles
+come after them, ordered by date.
+
+The plugin provides the following variables to your templates
+
+    * `article.series.name` is the name of the series as specified in the article metadata
+    * `article.series.index` is the index of the current article inside the series
+    * `article.series.all` is an ordered list of all articles in the series (including the current one)
+    * `article.series.all_previous` is an ordered list of the articles published before the current one
+    * `article.series.all_next` is an ordered list of the articles published after the current one
+    * `article.series.previous` is the previous article in the series (a shortcut to `article.series.all_previous[-1]`)
+    * `article.series.next` is the next article in the series (a shortcut to `article.series.all_next[0]`)
+
+For example:
+
+    {% if article.series %}
+        <p>This post is part {{ article.series.index }} of the "{{ article.series.name }}" series:</p>
+        <ol class="parts">
+            {% for part_article in article.series.all %}
+                <li {% if part_article == article %}class="active"{% endif %}>
+                    <a href='{{ SITEURL }}/{{ part_article.url }}'>{{ part_article.title }}</a>
+                </li>
+            {% endfor %}
+        </ol>
+    {% endif %}

series/__init__.py

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+from .series import *

series/series.py

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+# -*- coding: utf-8 -*-
+"""
+This plugin extends the original series plugin
+by FELD Boris <lothiraldan@gmail.com>
+
+Copyright (c) Leonardo Giordani <giordani.leonardo@gmail.com>
+
+Joins articles in a series and provides variables to
+manage the series in the template.
+"""
+
+from collections import defaultdict
+from operator import itemgetter
+
+from pelican import signals
+
+
+def aggregate_series(generator):
+    series = defaultdict(list)
+
+    # This cycles through all articles in the given generator
+    # and collects the 'series' metadata, if present.
+    # The 'series_index' metadata is also stored, if specified
+    for article in generator.articles:
+        if 'series' in article.metadata:
+            article_entry = (
+                article.metadata.get('series_index', None),
+                article.metadata['date'],
+                article
+            )
+
+            series[article.metadata['series']].append(article_entry)
+
+    # This uses items() which on Python2 is not a generator
+    # but we are dealing with a small amount of data so
+    # there shouldn't be performance issues =)
+    for series_name, series_articles in series.items():
+        # This is not DRY but very simple to understand
+        forced_order_articles = [
+            art_tup for art_tup in series_articles if art_tup[0] is not None]
+
+        date_order_articles = [
+            art_tup for art_tup in series_articles if art_tup[0] is None]
+
+        forced_order_articles.sort(key=itemgetter(0))
+        date_order_articles.sort(key=itemgetter(1))
+
+        all_articles = forced_order_articles + date_order_articles
+        ordered_articles = [art_tup[2] for art_tup in all_articles]
+        enumerated_articles = enumerate(ordered_articles)
+
+        for index, article in enumerated_articles:
+            article.series = dict()
+            article.series['name'] = series_name
+            article.series['index'] = index + 1
+            article.series['all'] = ordered_articles
+            article.series['all_previous'] = ordered_articles[0: index]
+            article.series['all_next'] = ordered_articles[index + 1:]
+
+            if index > 0:
+                article.series['previous'] = ordered_articles[index - 1]
+            else:
+                article.series['previous'] = None
+
+            try:
+                article.series['next'] = ordered_articles[index + 1]
+            except IndexError:
+                article.series['next'] = None
+
+
+def register():
+    signals.article_generator_finalized.connect(aggregate_series)