Documented virtual paths

content/docs/api/db/obj/contents.lr

@@ -29,22 +29,35 @@ Most plugins will not have source objects that actually originate on the
 file system.  This means that their "source" is entirely virtual.  Because
 this is a very common situation there is a base class, the
 `VirtualSourceObject` which plugins can subclass.  The constructor takes one
-argument which is the parent source object the virtual source lives below.
+argument which is the source record the virtual source lives below.  Virtual
+sources are separated from the records they belong to with an at sign (`@`)
+in the path.  The part after the at sign is called the “virtual path”.
+
+For instance in the below example the canonical path for the object would be
+the record's path + `@source`.  So if the record was `/hello` then the
+path would be `/hello@source`.  The true base record it belongs to can be
+referenced from the [record :ref](record/) property.
 
 ```python
 from lektor.sourceobj import VirtualSourceObject
+from lektor.utils import build_url
 
 class Source(VirtualSourceObject):
 
+    @property
+    def path(self):
+        return self.record.path + '@source'
+
     @property
     def source_content(self):
-        with open(self.parent.source_filename) as f:
+        with open(self.record.source_filename) as f:
             return f.read().decode('utf-8')
 
     @property
     def url_path(self):
-        return self.parent.url_path + 'source.txt'
+        return build_url([self.record.url_path, 'source.txt'])
 ```
 
 For more information see [add-build-program
-:ref](../../environment/add-build-program/).
+:ref](../../environment/add-build-program/) as well as
+[virtualpathresolver :ref](../../environment/virtualpathresolver/).

content/docs/api/db/obj/record/contents.lr

@@ -0,0 +1,28 @@
+title: record
+---
+summary: A reference to the associated base record.
+---
+type: property
+---
+version_added: 2.0
+---
+body:
+
+Most records (other than the root) have a [parent :ref](../parent/).  This as
+a concept generally makes in most situations.  However when virtual sources
+come into play the parent often just refers to another virtual source but not
+the root record they all belong to.
+
+This property for the most part refers back to the object itself.  However
+for virtual sources this refers back to the record that was associated with
+the virtual source.  Most of the time this matches `parent` but for nested
+source objects it's useful to be able to refer back to the base in all cases
+without having to walk up the parents.
+
+## Example
+
+```html+jinja
+{% if this != this.record %}
+  <a href="{{ this.record|url }}">go back to overview</a>
+{% endif %}
+```

content/docs/api/db/pad/get/contents.lr

@@ -17,7 +17,8 @@ The path needs to be absolute with folder separated by slashes.
 
 The default behavior is to load the unpaginated version of a record.  If you
 want to select a specific page for pagination, then you need to pass
-`page_num` with a valid page number.
+`page_num` with a valid page number or you use the virtual path (`@1` for the
+first page for instance).
 
 ## Examples
 
@@ -34,3 +35,15 @@ Here another example that loads the current page but in another language:
 {% set other_lang = site.get(this._path, alt='ru') %}
 <p>This page in Russian: {{ other_lang.title }}
 ```
+
+## Virtual Paths
+
+This method can also be used to look up [virtual paths
+:ref](../../../../content/paths/).  For instance to fetch a specific version of a
+pagination you can use a virtual path instead of using the `page_num`
+parameter:
+
+```pycon
+>>> pad.get('/blog@3')
+<Page model=u'blog' path='/blog' page_num=3>
+```

content/docs/api/db/record/pagination/contents.lr

@@ -29,7 +29,8 @@ The following attributes exist on the pagination object:
 | `for_page()` | Returns the record for a different page.
 
 The `for_page()` function accepts a page number and returns the record for
-the other page.
+the other page.  For more information also see the virtual path example
+below.
 
 !! *Changed in Lektor 2.0:* The `for_page()` method was added.
 
@@ -66,3 +67,23 @@ next page link as well as the number of the current page:
   {% endif %}
 </div>
 ```
+
+## Virtual Paths
+
+!! *New in Lektor 2.0:* virtual paths did not exist in earlier Lektor versions.
+
+The pagination is implemented in a way where each page in the pagination is
+a virtual path below the record itself.  The value of the path is just the
+number of the page.  So for instance to link to the second page you can just
+do this:
+
+```html+jinja
+<a href="{{ '@2'|url }}">Go to Page 2</a>
+```
+
+Alternatively you can also use the `for_path()` function which returns the
+entire pagination for a page:
+
+```html+jinja
+<a href="{{ this.pagination.for_page(2)|url }}">Go to Page 2</a>
+```

content/docs/api/db/record/parent/contents.lr

@@ -1,16 +0,0 @@
-title: parent
----
-summary: Returns the parent record for a record.
----
-type: property
----
-body:
-
-Because Lektor's database is a tree all records with the exception of the
-root record have a parent.  This can be accessed with this property.
-
-## Example
-
-```html+jinja
-<a href="{{ this.parent|url }}">Up to {{ this.parent.title }}</a>
-```

content/docs/api/environment/add-build-program/contents.lr

@@ -19,17 +19,22 @@ artifacts out of source objects.
 ```python
 from lektor.sourceobj import VirtualSourceObject
 from lektor.build_programs import BuildProgram
+from lektor.utils import build_url
 
 class Source(VirtualSourceObject):
 
+    @property
+    def path(self):
+        return self.record.path + '@source'
+
     @property
     def source_content(self):
-        with open(self.parent.source_filename) as f:
+        with open(self.record.source_filename) as f:
             return f.read().decode('utf-8')
 
     @property
     def url_path(self):
-        return self.parent.url_path + 'source.txt'
+        return build_url([self.record.url_path, 'source.txt'])
 
 class SourceBuildProgram(BuildProgram):
 
@@ -43,6 +48,11 @@ class SourceBuildProgram(BuildProgram):
                                       this=self.source)
 
 env.add_build_program(Source, SourceBuildProgram)
+
+@env.virtualpathresolver('source')
+def resolve_virtual_path(record, pieces):
+    if not pieces:
+        return Source(record)
 ```
 
 And here the example `view_source.html` template:

content/docs/api/environment/generator/contents.lr

@@ -20,12 +20,17 @@ exists for a page.
 ```python
 from lektor.sourceobj import VirtualSourceObject
 from lektor.db import Record
+from lektor.utils import build_url
 
 class Source(VirtualSourceObject):
 
+    @property
+    def path(self):
+        return self.record.path + '@source'
+
     @property
     def url_path(self):
-        return self.parent.url_path + 'source.txt'
+        return build_url([self.record.url_path, 'source.txt'])
 
 @env.generator
 def generate_source_file(node):

content/docs/api/environment/urlresolver/contents.lr

@@ -19,12 +19,17 @@ URL path segments.
 
 ```python
 from lektor.sourceobj import VirtualSourceObject
+from lektor.utils import build_url
 
 class Source(VirtualSourceObject):
 
+    @property
+    def path(self):
+        return self.record.path + '@source'
+
     @property
     def url_path(self):
-        return self.parent.url_path + 'source.txt'
+        return build_url([self.record.url_path, 'source.txt'])
 
 @env.urlresolver
 def match_source_file(node, url_path):

content/docs/api/environment/virtualpathresolver/contents.lr

@@ -0,0 +1,63 @@
+title: virtualpathresolver
+---
+signature: prefix
+---
+summary: Registers a virtual path resolver with the environment.
+---
+type: method
+---
+version_added: 2.0
+---
+body:
+
+When implementing [Virtual Source Objects :ref](../../db/obj/) it's important
+that you can locate them.  While virtual sources do not appear as children of
+pages they can be navigated to through the database pad.  This is achieved
+through custom virtual path resolvers.
+
+Each source object needs to be a unique prefix which identifies all instances
+of it.  For instance if you want to implement a special page (like a feed)
+that would exist for specific pages, then you can register the virtual path
+prefix `feed` with your plugin.  Though you should use more descriptive names
+for your plugins as these paths are shared.
+
+If a user then resolves the page `/my-page@feed` it would invoke your URL
+resolver with the record `my-page` and an empty list (rest of the path
+segments).  If they would request `/my-page@feed/recent` then it would
+pass `['recent']` as path segments.
+
+## Example
+
+Here an example that would implement a virtual source for feeds and an
+associated virtual path resolver:
+
+```python
+from lektor.sourceobj import VirtualSourceObject
+from lektor.utils import build_url
+
+class Feed(VirtualSourceObject):
+
+    def __init__(self, record, version='default'):
+        VirtualSourceObject.__init__(self, record)
+        self.version = version
+
+    @property
+    def path(self):
+        return '%s@feed%s' % (
+            self.record.path,
+            '/' + self.version if self.version != 'default' else '',
+        )
+
+    @property
+    def url_path(self):
+        return build_url([self.record.url_path, 'feed.xml'])
+
+
+def on_setup_env(self, **extra):
+    @self.env.virtualpathresolver('feed')
+    def resolve_virtual_path(record, pieces):
+        if not pieces:
+            return Feed(record)
+        elif pieces == ['recent']:
+            return Feed(record, version='recent')
+```

content/docs/api/utils/build-url/contents.lr

@@ -0,0 +1,32 @@
+title: build_url
+---
+module: lektor.utils
+---
+signature: pieces, trailing_slash=None
+---
+summary: Helper function that assists in building URL paths.
+---
+type: function
+---
+version_added: 2.0
+---
+body:
+
+This function assists in creating URL paths from individual segments.  This
+is particularly useful for building virtual source objects.  It takes a bunch
+of path segments and returns an absolute path.  The default behavior is to
+guess the trailing slash based on the presence of a dot in the last path
+segment.  If you want to override the detection you can explicitly pass
+`True` to enforce a trailing slash or `False` to avoid it.
+
+## Example
+
+```pycon
+>>> from lektor.utils import build_url
+>>> build_url(['foo', 42])
+u'/foo/42/'
+>>> build_url(['foo', None, 23])
+u'/foo/23/'
+>>> build_url(['foo', 'hello.html'])
+u'/foo/hello.html'
+```

content/docs/api/utils/join-path/contents.lr

@@ -0,0 +1,45 @@
+title: join_path
+---
+module: lektor.utils
+---
+signature: a, b
+---
+summary: Joins two Lektor paths together correctly.
+---
+template_var: 
+---
+type: function
+---
+version_added: 2.0
+---
+body:
+
+Given two Lektor paths this joins them together with the rules that Lektor
+set up for this.  In particular this is important in the presence of
+virtual paths which have their own join semantics.
+
+## Example
+
+```pycon
+>>> from lektor.utils import join_path
+>>> join_path('/blog', 'hello-world')
+'/blog/hello-world'
+>>> join_path('/blog', '@archive')
+'/blog@archive'
+>>> join_path('/blog@archive', '2015')
+'/blog@archive/2015'
+>>> join_path('/blog@archive/2015', '..')
+'/blog@archive'
+>>> join_path('/blog@archive', '..')
+'/blog'
+```
+
+Special note should be taken for the numeric virtual path of paginations.  It
+is considered to be on the same level as the actual record:
+
+```pycon
+>>> join_path('/blog@2', '..')
+'/'
+>>> join_path('/blog@2', '.')
+'/blog@2'
+```

content/docs/api/utils/parse-path/contents.lr

@@ -0,0 +1,25 @@
+title: parse_path
+---
+module: lektor.utils
+---
+summary: Parses a path into components.
+---
+type: function
+---
+version_added: 2.0
+---
+body:
+
+This function parses a path into the individual components it's made from.
+The path is always assumed to be absolute and made absolute if it's not yet
+so.  The root path is the empty list.
+
+## Example
+
+```pycon
+>>> from lektor.utils import parse_path
+>>> parse_path('/foo/bar')
+['foo', 'bar']
+>>> parse_path('/')
+[]
+```

content/docs/content/alts/contents.lr

@@ -72,3 +72,11 @@ targeted, different files will be used.  This table visualizes this:
 |             | ✓              |                | fr     | contents+fr.lr
 |             |                | ✓              | en     | contents+en.lr
 |             |                | ✓              | fr     | *missing*
+
+## Alternatives and Paths
+
+Alternatives have a special behavior with regards to paths.  They alternative
+code does not exist in the path!  This can be confusing at first, but has the
+advantage that they automatically work in most places as the paths are the
+same for differnent alternatives.  For more information see
+[Alternatives and Paths :ref](../paths/#alternatives-and-paths).

content/docs/content/paths/contents.lr

@@ -0,0 +1,96 @@
+title: Paths
+---
+summary: An explanation about how paths in Lektor work.
+---
+body:
+
+!! This refers mostly to Lektor 2.0.  If you are using an older version of
+Lektor the virtual path feature is not implemented yet and a lot of this just
+does not apply.
+
+Lektor attempts to map the paths from the content folder as closely as possible
+to the final URLs (at least in the default configuration).  There are various
+ways in which this can be customized (see [URLs and Slugs :ref](../urls/)) and
+there are situations in which Lektor needs to render out content that does not
+actually directly correspond to a path on the file system.
+
+Here we try to explain how the path system in Lektor works and what it means.
+
+## What is a Path
+
+A path in Lektor is a string that uniquely identifies a [Source Object
+:ref](../../api/db/obj/).  For the most part these directly point to
+`content.lr` files or attachments therein.  These paths always use forward
+slashes, no matter on which platform Lektor runs.  So for instance if you
+have a file named `projects/my-project/contents.lr` then the path for this
+record will be `/projects/my-project`.  Thereby it does not matter if the
+slug or final URL was changed, the path is always the same.
+
+Lektor uses paths to refer to records by default in all cases.  This means that
+if you use the [url filter :ref](../../api/templates/filters/url/) for instance
+it will operate on paths and not URLs!
+
+But what about sources that do not directly correspond to something on the
+file system?  This is where virtual paths come in.  Virtual paths are
+separated from physical paths with an at (`@`) sign.  Virtual paths are always
+attached to a record and point to things that are not actually coming from the
+content folder but something else.
+
+Virtual paths are for instance used to refer to paginated pages or to some
+resources that plugins add.
+
+## Virtual Paths
+
+Virtual paths are added behind physical paths and are separated by an at
+sign (`@`).  The only virtual path that is supported by Lektor out of the box
+is the special numeric virtual path which can be used to refer to specific
+pages for a pagination.  For instance `/blog@1` refers to the first page of
+the `blog` page, `/blog@2` to the second etc.  There are however plugins that
+add virtual paths to refer to their own resources.  For instance a plugin can
+register `/blog@feed` to refer to a RSS/Atom feed for the blog.
+
+## Relative Paths
+
+Now that we talked a bit about paths, we should probably cover how relative
+paths work.  Relative paths work similar to how you expect them to work on
+most operating systems but they can operate on the virtual as well as the
+physical path.  There is also some special behavior with regards to the numeric
+virtual path for pagination.
+
+For the most part `.` refers to the same page and `..` refers to the page one
+level up.  If you use a path that just contains of a virtual path, then it's
+attached to the current page to replace the active virtual path.
+
+| Current         | Relative     | Result
+| --------------- | ------------ | ----------------
+| `/blog`         | `..`         | `/`
+| `/blog`         | `.`          | `/blog`
+| `/blog/post`    | `..`         | `/blog`
+| `/blog`         | `@2`         | `/blog@2`
+| `/blog@2`       | `@1`         | `/blog@1`
+| `/blog@feed`    | `recent`     | `/blog@feed/recent`
+| `/blog@feed`    | `..`         | `/blog@feed`
+
+However! The numeric path is special with regards because it's considered to
+belong to the current page:
+
+| Current         | Relative     | Result
+| --------------- | ------------ | ----------------
+| `/blog@2`       | `.`          | `/blog@2`
+| `/blog@2`       | `..`         | `/`
+
+## Alternatives and Paths
+
+If you have used Lektor a bit you might be wondering how [Alternatives
+:ref](../alts/) work with paths.  The answer might be surprising but it's
+basically that they don't really work with paths.  Alternatives are
+implemented on a level higher than paths.  If you have a page that exists
+in both German and English alternative then they will have the same path.
+The alternative code is supplied separately.
+
+This is done so that you can later start introducing alternatives to sites
+that were never aware of them without having to go everywhere and start
+passing alternative information around.  While there are indeed some places
+where you might have to perform some changes (especially if you perform
+manual queries in the templates) for the most part adding alternatives to an
+existing site later is a trivial matter.

packages/blog-archive/lektor_blog_archive.py

@@ -1,72 +1,45 @@
 # -*- coding: utf-8 -*-
 import posixpath
 from datetime import date
+from itertools import chain
 
 from werkzeug.utils import cached_property
 
 from lektor.pluginsystem import Plugin
 from lektor.sourceobj import VirtualSourceObject
 from lektor.build_programs import BuildProgram
-from lektor.context import get_ctx
+from lektor.utils import build_url, parse_path
-
-
-def get_path_segments(str):
-    pieces = str.split('/')
-    if pieces == ['']:
-        return []
-    return pieces
-
-
-def push_path(pieces, item):
-    if item:
-        pieces.append(unicode(item))
 
 
 class BlogArchive(VirtualSourceObject):
 
-    def __init__(self, parent, plugin, items=None, year=None, month=None):
+    def __init__(self, record, plugin, items=None):
-        VirtualSourceObject.__init__(self, parent)
+        VirtualSourceObject.__init__(self, record)
         self.plugin = plugin
         self._items = items
-        self.year = year
-        self.month = month
 
     @property
-    def date(self):
+    def path(self):
-        if self.year is None:
+        return self.record.path + '@blog-archive'
-            raise AttributeError()
+
-        return date(self.year, self.month or 1, 1)
+    template_name = 'blog-archive/index.html'
 
     @property
-    def year_archive(self):
+    def parent(self):
-        if self.year is None:
+        return self.record
-            raise AttributeError()
-        if self.month is None:
-            return self
-        return BlogArchive(self.parent, self.plugin, year=self.year)
-
-    @property
-    def archive_index(self):
-        if self.year is None:
-            return self
-        return BlogArchive(self.parent, self.plugin)
 
     @cached_property
     def year_archives(self):
-        if self.year is not None:
-            return []
         years = set()
-        for item in self.parent.children:
+        for item in self.record.children:
             pub_date = self.plugin.get_pub_date(item)
             if pub_date:
                 years.add(pub_date.year)
-        return [BlogArchive(self.parent, self.plugin,
+        return [BlogYearArchive(self.record, self.plugin,
                                 year=year) for year in sorted(years)]
 
     @property
     def items(self):
-        if self.year is None:
-            return []
         if self._items is not None:
             return self._items
         rv = list(self._iter_items())
@@ -74,13 +47,7 @@ class BlogArchive(VirtualSourceObject):
         return rv
 
     def _iter_items(self):
-        for item in self.parent.children:
+        return iter(())
-            pub_date = self.plugin.get_pub_date(item)
-            if pub_date is None:
-                continue
-            if pub_date.year == self.year and \
-               (self.month is None or pub_date.month == self.month):
-                yield item
 
     @property
     def has_any_items(self):
@@ -97,34 +64,87 @@ class BlogArchive(VirtualSourceObject):
             pub_date = self.plugin.get_pub_date(item)
             months.setdefault(date(pub_date.year, pub_date.month, 1),
                               []).append(item)
-        return [(BlogArchive(self.parent, self.plugin,
+        return [(BlogMonthArchive(self.record, self.plugin,
                                   year=d.year, month=d.month), i)
                 for d, i in sorted(months.items())]
 
-    @property
+    def get_archive_url_path(self):
-    def url_path(self):
+        return self.plugin.get_url_path('archive_path')
-        prefix = self.parent.url_path.strip('/')
-        pieces = []
-        if prefix:
-            pieces.append(prefix)
-        if self.year is None:
-            push_path(pieces, self.plugin.get_archive_index_path())
-        elif self.month is None:
-            push_path(pieces, self.plugin.get_month_archive_prefix())
-            push_path(pieces, self.year)
-        else:
-            push_path(pieces, self.plugin.get_year_archive_prefix())
-            push_path(pieces, self.year)
-            push_path(pieces, self.month)
-        return '/%s/' % '/'.join(pieces)
 
     @property
-    def template_name(self):
+    def url_path(self):
-        if self.year is None:
+        return build_url(chain([self.record.url_path.strip('/')],
-            return 'blog-archive/index.html'
+                               self.get_archive_url_path() or ()))
-        if self.month is None:
+
-            return 'blog-archive/year.html'
+
-        return 'blog-archive/month.html'
+class BlogYearArchive(BlogArchive):
+    template_name = 'blog-archive/year.html'
+
+    def __init__(self, record, plugin, items=None, year=None):
+        BlogArchive.__init__(self, record, plugin, items)
+        self.year = year
+
+    def _iter_items(self):
+        for item in self.record.children:
+            pub_date = self.plugin.get_pub_date(item)
+            if pub_date is not None and \
+               pub_date.year == self.year:
+                yield item
+
+    @property
+    def path(self):
+        return '%s@blog-archive/%s' % (
+            self.record.path,
+            self.year,
+        )
+
+    @property
+    def parent(self):
+        return BlogArchive(self.record, self.plugin)
+
+    @property
+    def date(self):
+        return date(self.year, 1, 1)
+
+    def get_archive_url_path(self):
+        return self.plugin.get_url_path('year_archive_prefix') + [self.year]
+
+
+class BlogMonthArchive(BlogArchive):
+    template_name = 'blog-archive/year.html'
+
+    def __init__(self, record, plugin, items=None, year=None, month=None):
+        BlogArchive.__init__(self, record, plugin, items)
+        self.year = year
+        self.month = month
+
+    def _iter_items(self):
+        for item in self.record.children:
+            pub_date = self.plugin.get_pub_date(item)
+            if pub_date is not None and \
+               pub_date.year == self.year and \
+               pub_date.month == self.month:
+                yield item
+
+    @property
+    def path(self):
+        return '%s@blog-archive/%s/%s' % (
+            self.record.path,
+            self.year,
+            self.month
+        )
+
+    @property
+    def parent(self):
+        return BlogYearArchive(self.record, self.plugin, year=self.year)
+
+    @property
+    def date(self):
+        return date(self.year, self.month, 1)
+
+    def get_archive_url_path(self):
+        return self.plugin.get_url_path('month_archive_prefix') + [
+            self.year, self.month]
 
 
 class BlogArchiveBuildProgram(BuildProgram):
@@ -150,77 +170,70 @@ class BlogArchivePlugin(Plugin):
     def get_blog_path(self):
         return self.get_config().get('blog_path', '/blog')
 
-    def get_archive_index_path(self):
+    def get_url_path(self, name, default='archive'):
-        return self.get_config().get('archive_path', 'archive').strip('/')
+        return parse_path(self.get_config().get(name, default))
-
-    def get_year_archive_prefix(self):
-        return self.get_config().get('year_archive_prefix', 'archive').strip('/')
-
-    def get_month_archive_prefix(self):
-        return self.get_config().get('month_archive_prefix', 'archive').strip('/')
 
     def on_setup_env(self, **extra):
-        blog_path = self.get_blog_path()
         self.env.add_build_program(BlogArchive, BlogArchiveBuildProgram)
 
-        def get_blog_archive():
+        @self.env.virtualpathresolver('blog-archive')
-            pad = get_ctx().pad
+        def blog_archive_resolver(node, pieces):
-            blog = pad.get(blog_path)
+            if node.path == self.get_blog_path():
-            if blog is not None:
+                if not pieces:
-                return BlogArchive(blog, self)
+                    return BlogArchive(node, self)
-        self.env.jinja_env.globals['get_blog_archive'] = get_blog_archive
+                elif len(pieces) == 1 and pieces[0].isdigit():
+                    return BlogYearArchive(node, self, year=int(pieces[0]))
+                elif len(pieces) == 2 and pieces[0].isdigit() \
+                        and pieces[1].isdigit():
+                    return BlogMonthArchive(node, self, year=int(pieces[0]),
+                                            month=int(pieces[1]))
 
         @self.env.urlresolver
-        def archive_resolver(node, url_path):
+        def archive_urlresolver(node, url_path):
-            if node.path != blog_path:
+            if node.path != self.get_blog_path():
                 return
 
-            archive_index = get_path_segments(self.get_archive_index_path())
+            archive_index = self.get_url_path('archive_path')
             if url_path == archive_index:
                 return BlogArchive(node, self)
 
-            year_prefix = get_path_segments(self.get_year_archive_prefix())
+            year_prefix = self.get_url_path('year_archive_prefix')
-            month_prefix = get_path_segments(self.get_month_archive_prefix())
-
-            year = None
-            month = None
-
             if url_path[:len(year_prefix)] == year_prefix and \
                url_path[len(year_prefix)].isdigit() and \
                len(url_path) == len(year_prefix) + 1:
                 year = int(url_path[len(year_prefix)])
-            elif (url_path[:len(month_prefix)] == month_prefix and
+                rv = BlogYearArchive(node, self, year=year)
-                  len(url_path) == len(month_prefix) + 2 and
+                if rv.has_any_items:
-                  url_path[len(month_prefix)].isdigit() and
+                    return rv
-                  url_path[len(month_prefix) + 1].isdigit()):
+
+            month_prefix = self.get_url_path('month_archive_prefix')
+            if url_path[:len(month_prefix)] == month_prefix and \
+               len(url_path) == len(month_prefix) + 2 and \
+               url_path[len(month_prefix)].isdigit() and \
+               url_path[len(month_prefix) + 1].isdigit():
                 year = int(url_path[len(month_prefix)])
                 month = int(url_path[len(month_prefix) + 1])
-            else:
+                rv = BlogMonthArchive(node, self, year=year, month=month)
-                return None
-
-            rv = BlogArchive(node, self, year=year, month=month)
                 if rv.has_any_items:
                     return rv
 
         @self.env.generator
         def genererate_blog_archive_pages(source):
-            if source.path != blog_path:
+            if source.path != self.get_blog_path():
                 return
 
-            blog = source
-
             years = {}
             months = {}
-            for post in blog.children:
+            for post in source.children:
                 pub_date = self.get_pub_date(post)
                 if pub_date:
                     years.setdefault(pub_date.year, []).append(post)
                     months.setdefault((pub_date.year,
                                        pub_date.month), []).append(post)
 
-            yield BlogArchive(blog, self)
+            yield BlogArchive(source, self)
             for year, items in sorted(years.items()):
-                yield BlogArchive(blog, self, year=year, items=items)
+                yield BlogYearArchive(source, self, year=year, items=items)
             for (year, month), items in sorted(months.items()):
-                yield BlogArchive(blog, self, year=year, month=month,
+                yield BlogMonthArchive(source, self, year=year, month=month,
                                        items=items)

templates/blog-archive/month.html

@@ -3,7 +3,7 @@
 {% block blog_body %}
   <h1>The Transcript, {{ this.date|dateformat('MMMM yyyy') }}</h1>
   <p>
-    <a href="{{ this.year_archive|url }}">&laquo; Back to {{ this.year }}</a>
+    <a href="{{ '..'|url }}">&laquo; Back to {{ this.year }}</a>
   <ul>
   {% for post in this.items %}
     <li><a href="{{ post|url }}">{{ post.title }}</a> by {{ post.author }} on {{ post.pub_date|dateformat }}

templates/blog-archive/year.html

@@ -3,7 +3,7 @@
 {% block blog_body %}
   <h1>The Transcript in {{ this.year }}</h1>
   <p>
-    <a href="{{ this.archive_index|url }}">&laquo; Back to the archive</a>
+    <a href="{{ '..'|url }}">&laquo; Back to the archive</a>
   <ul>
   {% for archive, items in this.items_by_months %}
     <li><a href="{{ archive|url }}">{{ archive.date|dateformat('MMMM') }}</a>:

templates/blog-layout.html

@@ -33,8 +33,7 @@
       </ul>
       <h3>Missed a Post?</h3>
       <ul>
-        {% set archive = get_blog_archive() %}
+        <li><a href="{{ '$blog-archive'|url }}">Blog Archives</a>
-        <li><a href="{{ archive|url }}">Blog Archives</a>
       </ul>
     </div>
   </div>