Merge pull request #779 from johnmastro/add-period-archives

Add period archives

docs/settings.rst

@@ -178,6 +178,27 @@ Example usage:
 This would save your articles in something like ``/posts/2011/Aug/07/sample-post/index.html``,
 and the URL to this would be ``/posts/2011/Aug/07/sample-post/``.
 
+Pelican can optionally create per-year, per-month, and per-day archives of your
+posts. These secondary archives are disabled by default but are automatically
+enabled if you supply format strings for their respective `_SAVE_AS` settings.
+Period archives fit intuitively with the hierarchical model of web URLs and can
+make it easier for readers to navigate through the posts you've written over time.
+
+Example usage:
+
+* YEAR_ARCHIVE_SAVE_AS = ``'posts/{date:%Y}/index.html'``
+* MONTH_ARCHIVE_SAVE_AS = ``'posts/{date:%Y}/{date:%b}/index.html'``
+
+With these settings, Pelican will create an archive of all your posts for the year
+at (for instance) 'posts/2011/index.html', and an archive of all your posts for
+the month at 'posts/2011/Aug/index.html'.
+
+.. note::
+    Period archives work best when the final path segment is 'index.html'.
+    This way a reader can remove a portion of your URL and automatically
+    arrive at an appropriate archive of posts, without having to specify
+    a page name.
+
 ====================================================    =====================================================
 Setting name (default value)                            What does it do?
 ====================================================    =====================================================
@@ -204,6 +225,12 @@ Setting name (default value)                            What does it do?
 `<DIRECT_TEMPLATE_NAME>_SAVE_AS`                        The location to save content generated from direct
                                                         templates. Where <DIRECT_TEMPLATE_NAME> is the
                                                         upper case template name.
+`YEAR_ARCHIVE_SAVE_AS` (False)                          The location to save per-year archives of your
+                                                        posts.
+`MONTH_ARCHIVE_SAVE_AS` (False)                         The location to save per-month archives of your
+                                                        posts.
+`DAY_ARCHIVE_SAVE_AS` (False)                           The location to save per-day archives of your
+                                                        posts.
 ====================================================    =====================================================
 
 .. note::

docs/themes.rst

@@ -17,16 +17,17 @@ To make your own theme, you must follow the following structure::
     │   ├── css
     │   └── images
     └── templates
-        ├── archives.html    // to display archives
-        ├── article.html     // processed for each article
-        ├── author.html      // processed for each author
-        ├── authors.html     // must list all the authors
-        ├── categories.html  // must list all the categories
-        ├── category.html    // processed for each category
-        ├── index.html       // the index. List all the articles
-        ├── page.html        // processed for each page
-        ├── tag.html         // processed for each tag
-        └── tags.html        // must list all the tags. Can be a tag cloud.
+        ├── archives.html         // to display archives
+        ├── period_archives.html  // to display time-period archives
+        ├── article.html          // processed for each article
+        ├── author.html           // processed for each author
+        ├── authors.html          // must list all the authors
+        ├── categories.html       // must list all the categories
+        ├── category.html         // processed for each category
+        ├── index.html            // the index. List all the articles
+        ├── page.html             // processed for each page
+        ├── tag.html              // processed for each tag
+        └── tags.html             // must list all the tags. Can be a tag cloud.
 
 * `static` contains all the static assets, which will be copied to the output
   `theme` folder. I've put the CSS and image folders here, but they are

pelican/generators.py

@@ -11,7 +11,7 @@ import shutil
 from codecs import open
 from collections import defaultdict
 from functools import partial
-from itertools import chain
+from itertools import chain, groupby
 from operator import attrgetter, itemgetter
 
 from jinja2 import (
@@ -257,6 +257,46 @@ class ArticlesGenerator(Generator):
             write(article.save_as, self.get_template(article.template),
                 self.context, article=article, category=article.category)
 
+    def generate_period_archives(self, write):
+        """Generate per-year, per-month, and per-day archives."""
+        try:
+            template = self.get_template('period_archives')
+        except Exception:
+            template = self.get_template('archives')
+
+        def _generate_period_archives(dates, key, save_as_fmt):
+            """Generate period archives from `dates`, grouped by
+            `key` and written to `save_as`.
+            """
+            # `dates` is already sorted by date
+            for _period, group in groupby(dates, key=key):
+                archive = list(group)
+                # arbitrarily grab the first date so that the usual
+                # format string syntax can be used for specifying the
+                # period archive dates
+                date = archive[0].date
+                save_as = save_as_fmt.format(date=date)
+                write(save_as, template, self.context,
+                      dates=archive, blog=True)
+
+        period_save_as = {
+                'year' : self.settings.get('YEAR_ARCHIVE_SAVE_AS'),
+                'month': self.settings.get('MONTH_ARCHIVE_SAVE_AS'),
+                'day'  : self.settings.get('DAY_ARCHIVE_SAVE_AS')
+                }
+
+        period_date_key = {
+                'year' : attrgetter('date.year'),
+                'month': attrgetter('date.year', 'date.month'),
+                'day'  : attrgetter('date.year', 'date.month', 'date.day')
+                }
+
+        for period in 'year', 'month', 'day':
+            save_as = period_save_as[period]
+            if save_as:
+                key = period_date_key[period]
+                _generate_period_archives(self.dates, key, save_as)
+
     def generate_direct_templates(self, write):
         """Generate direct templates pages"""
         PAGINATED_TEMPLATES = self.settings.get('PAGINATED_DIRECT_TEMPLATES')
@@ -320,6 +360,7 @@ class ArticlesGenerator(Generator):
         # to minimize the number of relative path stuff modification
         # in writer, articles pass first
         self.generate_articles(write)
+        self.generate_period_archives(write)
         self.generate_direct_templates(write)
 
         # and subfolders after that

pelican/settings.py

@@ -60,6 +60,9 @@ _DEFAULT_CONFIG = {'PATH': '.',
                    'TAG_SAVE_AS': 'tag/{slug}.html',
                    'AUTHOR_URL': 'author/{slug}.html',
                    'AUTHOR_SAVE_AS': 'author/{slug}.html',
+                   'YEAR_ARCHIVE_SAVE_AS': False,
+                   'MONTH_ARCHIVE_SAVE_AS': False,
+                   'DAY_ARCHIVE_SAVE_AS': False,
                    'RELATIVE_URLS': True,
                    'DEFAULT_LANG': 'en',
                    'TAG_CLOUD_STEPS': 4,