add basic asset pipeline for pelican site

.circleci/config.yml

@@ -377,7 +377,7 @@ jobs:
 
   deploy_homepage:
     docker:
-      - image: circleci/python:3.6
+      - image: circleci/python:3.6-node
     working_directory: ~/offen/homepage
     environment:
       - SOURCE_BRANCH: master
@@ -397,6 +397,11 @@ jobs:
           paths:
             - ~/offen/homepage/venv
           key: offen-homepage-{{ checksum "requirements.txt" }}
+      - run:
+          name: Install image optimization deps
+          command: |
+            npm install svgo -g
+            sudo apt-get install libjpeg-progs optipng
       - run:
           name: Deploy
           command: |

homepage/docker-compose.yml

@@ -12,6 +12,8 @@ services:
     command: make devserver
     ports:
       - 8000:8000
+    environment:
+      DEBUG: '1'
 
 volumes:
   homepagedeps:

homepage/pelicanconf.py

@@ -4,12 +4,10 @@ from __future__ import unicode_literals
 import logging
 
 # If your site is available via HTTPS, make sure SITEURL begins with https://
-#SITEURL = 'https://www.offen.dev'
 RELATIVE_URLS = False
 
 AUTHOR = 'offen'
 SITENAME = 'offen'
-SITEURL = 'https://www.offen.dev'
 PATH = 'content'
 TIMEZONE = 'Europe/Berlin'
 DEFAULT_LANG = 'en'
@@ -30,6 +28,9 @@ THEME = './theme'
 # Delete the output directory before generating new files.
 DELETE_OUTPUT_DIRECTORY = True
 
+PLUGIN_PATHS = ['./plugins']
+PLUGINS = ['assets']
+
 # dont create following standard pages
 AUTHORS_SAVE_AS = None
 ARCHIVES_SAVE_AS = None

homepage/plugins/assets/Readme.rst

@@ -0,0 +1,106 @@
+Asset management
+----------------
+
+This plugin allows you to use the `Webassets`_ module to manage assets such as
+CSS and JS files. The module must first be installed::
+
+    pip install webassets
+
+The Webassets module allows you to perform a number of useful asset management
+functions, including:
+
+* CSS minifier (``cssmin``, ``yui_css``, ...)
+* CSS compiler (``less``, ``sass``, ...)
+* JS minifier (``uglifyjs``, ``yui_js``, ``closure``, ...)
+
+Others filters include CSS URL rewriting, integration of images in CSS via data
+URIs, and more. Webassets can also append a version identifier to your asset
+URL to convince browsers to download new versions of your assets when you use
+far-future expires headers. Please refer to the `Webassets documentation`_ for
+more information.
+
+When used with Pelican, Webassets is configured to process assets in the
+``OUTPUT_PATH/theme`` directory. You can use Webassets in your templates by
+including one or more template tags. The Jinja variable ``{{ ASSET_URL }}`` can
+be used in templates and is relative to the ``theme/`` url. The
+``{{ ASSET_URL }}`` variable should be used in conjunction with the
+``{{ SITEURL }}`` variable in order to generate URLs properly. For example:
+
+.. code-block:: jinja
+
+    {% assets filters="cssmin", output="css/style.min.css", "css/inuit.css", "css/pygment-monokai.css", "css/main.css" %}
+        <link rel="stylesheet" href="{{ SITEURL }}/{{ ASSET_URL }}">
+    {% endassets %}
+
+... will produce a minified css file with a version identifier that looks like:
+
+.. code-block:: html
+
+    <link href="http://{SITEURL}/theme/css/style.min.css?b3a7c807" rel="stylesheet">
+
+These filters can be combined. Here is an example that uses the SASS compiler
+and minifies the output:
+
+.. code-block:: jinja
+
+    {% assets filters="sass,cssmin", output="css/style.min.css", "css/style.scss" %}
+        <link rel="stylesheet" href="{{ SITEURL }}/{{ ASSET_URL }}">
+    {% endassets %}
+
+Another example for Javascript:
+
+.. code-block:: jinja
+
+    {% assets filters="uglifyjs", output="js/packed.js", "js/jquery.js", "js/base.js", "js/widgets.js" %}
+        <script src="{{ SITEURL }}/{{ ASSET_URL }}"></script>
+    {% endassets %}
+
+The above will produce a minified JS file:
+
+.. code-block:: html
+
+    <script src="http://{SITEURL}/theme/js/packed.js?00703b9d"></script>
+
+Pelican's debug mode is propagated to Webassets to disable asset packaging
+and instead work with the uncompressed assets.
+
+If you need to create named bundles (for example, if you need to compile SASS
+files before minifying with other CSS files), you can use the ``ASSET_BUNDLES``
+variable in your settings file. This is an ordered sequence of 3-tuples, where
+the 3-tuple is defined as ``(name, args, kwargs)``. This tuple is passed to the
+`environment's register() method`_. The following will compile two SCSS files
+into a named bundle, using the ``pyscss`` filter:
+
+.. code-block:: python
+
+    ASSET_BUNDLES = (
+        ('scss', ['colors.scss', 'main.scss'], {'filters': 'pyscss'}),
+    )
+
+Many of Webasset's available compilers have additional configuration options
+(i.e. 'Less', 'Sass', 'Stylus', 'Closure_js').  You can pass these options to
+Webassets using the ``ASSET_CONFIG`` in your settings file.
+
+The following will handle Google Closure's compilation level and locate
+LessCSS's binary:
+
+.. code-block:: python
+
+    ASSET_CONFIG = (('closure_compressor_optimization', 'WHITESPACE_ONLY'),
+                    ('less_bin', 'lessc.cmd'), )
+
+If you wish to place your assets in locations other than the theme output
+directory, you can use ``ASSET_SOURCE_PATHS`` in your settings file to provide
+webassets with a list of additional directories to search, relative to the
+theme's top-level directory:
+
+.. code-block:: python
+
+   ASSET_SOURCE_PATHS = [
+       'vendor/css',
+       'scss',
+       ]
+
+.. _Webassets: https://github.com/miracle2k/webassets
+.. _Webassets documentation: http://webassets.readthedocs.org/en/latest/builtin_filters.html
+.. _environment's register() method: http://webassets.readthedocs.org/en/latest/environment.html#registering-bundles

homepage/plugins/assets/__init__.py

@@ -0,0 +1 @@
+from .assets import *

homepage/plugins/assets/assets.py

@@ -0,0 +1,75 @@
+# -*- coding: utf-8 -*-
+"""
+Asset management plugin for Pelican
+===================================
+
+This plugin allows you to use the `webassets`_ module to manage assets such as
+CSS and JS files.
+
+The ASSET_URL is set to a relative url to honor Pelican's RELATIVE_URLS
+setting. This requires the use of SITEURL in the templates::
+
+    <link rel="stylesheet" href="{{ SITEURL }}/{{ ASSET_URL }}">
+
+.. _webassets: https://webassets.readthedocs.org/
+
+"""
+from __future__ import unicode_literals
+
+import os
+import logging
+
+from pelican import signals
+logger = logging.getLogger(__name__)
+
+try:
+    import webassets
+    from webassets import Environment
+    from webassets.ext.jinja2 import AssetsExtension
+except ImportError:
+    webassets = None
+
+def add_jinja2_ext(pelican):
+    """Add Webassets to Jinja2 extensions in Pelican settings."""
+
+    if 'JINJA_ENVIRONMENT' in pelican.settings: # pelican 3.7+
+        pelican.settings['JINJA_ENVIRONMENT']['extensions'].append(AssetsExtension)
+    else:
+        pelican.settings['JINJA_EXTENSIONS'].append(AssetsExtension)
+
+
+def create_assets_env(generator):
+    """Define the assets environment and pass it to the generator."""
+
+    theme_static_dir = generator.settings['THEME_STATIC_DIR']
+    assets_destination = os.path.join(generator.output_path, theme_static_dir)
+    generator.env.assets_environment = Environment(
+        assets_destination, theme_static_dir)
+
+    if 'ASSET_CONFIG' in generator.settings:
+        for item in generator.settings['ASSET_CONFIG']:
+            generator.env.assets_environment.config[item[0]] = item[1]
+
+    if 'ASSET_BUNDLES' in generator.settings:
+        for name, args, kwargs in generator.settings['ASSET_BUNDLES']:
+            generator.env.assets_environment.register(name, *args, **kwargs)
+
+    if 'ASSET_DEBUG' in generator.settings:
+        generator.env.assets_environment.debug = generator.settings['ASSET_DEBUG']
+    elif logging.getLevelName(logger.getEffectiveLevel()) == "DEBUG":
+        generator.env.assets_environment.debug = True
+
+    for path in (generator.settings['THEME_STATIC_PATHS'] +
+                 generator.settings.get('ASSET_SOURCE_PATHS', [])):
+        full_path = os.path.join(generator.theme, path)
+        generator.env.assets_environment.append_path(full_path)
+
+
+def register():
+    """Plugin registration."""
+    if webassets:
+        signals.initialized.connect(add_jinja2_ext)
+        signals.generator_init.connect(create_assets_env)
+    else:
+        logger.warning('`assets` failed to load dependency `webassets`.'
+                       '`assets` plugin not loaded.')

homepage/plugins/optimize_images/Readme.md

@@ -0,0 +1,28 @@
+Optimize Images Plugin For Pelican
+==================================
+
+This plugin applies lossless compression on JPEG, PNG and SVG images, with no
+effect on image quality via [jpegtran][], [OptiPNG][] and [svgo][] respectively. 
+The plugin assumes that all of these tools are installed, with associated
+executables available on the system path.
+
+[jpegtran]: http://jpegclub.org/jpegtran/
+[OptiPNG]: http://optipng.sourceforge.net/
+[SVGO]: https://github.com/svg/svgo
+
+
+Installation
+------------
+
+To enable, ensure that `optimize_images.py` is put somewhere that is accessible.
+Then use as follows by adding the following to your settings.py:
+
+    PLUGIN_PATH = 'path/to/pelican-plugins'
+    PLUGINS = ["optimize_images"]
+
+`PLUGIN_PATH` can be a path relative to your settings file or an absolute path.
+
+Usage
+-----
+The plugin will activate and optimize images upon `finalized` signal of
+Pelican.

homepage/plugins/optimize_images/__init__.py

@@ -0,0 +1 @@
+from .optimize_images import *

homepage/plugins/optimize_images/optimize_images.py

@@ -0,0 +1,61 @@
+# -*- coding: utf-8 -*-
+
+"""
+Optimized images (jpg and png)
+Assumes that jpegtran and optipng are isntalled on path.
+http://jpegclub.org/jpegtran/
+http://optipng.sourceforge.net/
+Copyright (c) 2012 Irfan Ahmad (http://i.com.pk)
+"""
+
+import logging
+import os
+from subprocess import call
+
+from pelican import signals
+
+logger = logging.getLogger(__name__)
+
+# Display command output on DEBUG and TRACE
+SHOW_OUTPUT = logger.getEffectiveLevel() <= logging.DEBUG
+
+# A list of file types with their respective commands
+COMMANDS = {
+    # '.ext': ('command {flags} {filename', 'silent_flag', 'verbose_flag')
+    '.svg': ('svgo {flags} --input="{filename}" --output="{filename}"', '--quiet', ''),
+    '.jpg': ('jpegtran {flags} -copy none -optimize -outfile "{filename}" "{filename}"', '', '-v'),
+    '.png': ('optipng {flags} "{filename}"', '--quiet', ''),
+}
+
+
+def optimize_images(pelican):
+    """
+    Optimized jpg and png images
+
+    :param pelican: The Pelican instance
+    """
+    for dirpath, _, filenames in os.walk(pelican.settings['OUTPUT_PATH']):
+        for name in filenames:
+            if os.path.splitext(name)[1] in COMMANDS.keys():
+                optimize(dirpath, name)
+
+def optimize(dirpath, filename):
+    """
+    Check if the name is a type of file that should be optimized.
+    And optimizes it if required.
+
+    :param dirpath: Path of the file to be optimzed
+    :param name: A file name to be optimized
+    """
+    filepath = os.path.join(dirpath, filename)
+    logger.info('optimizing %s', filepath)
+
+    ext = os.path.splitext(filename)[1]
+    command, silent, verbose = COMMANDS[ext]
+    flags = verbose if SHOW_OUTPUT else silent
+    command = command.format(filename=filepath, flags=flags)
+    call(command, shell=True)
+
+
+def register():
+    signals.finalized.connect(optimize_images)

homepage/publishconf.py

@@ -19,9 +19,6 @@ CATEGORY_FEED_ATOM = 'feeds/{slug}.atom.xml'
 
 DELETE_OUTPUT_DIRECTORY = True
 
-# Following items are often useful when publishing
+PLUGINS += ['optimize_images']
-
-#DISQUS_SITENAME = ""
-#GOOGLE_ANALYTICS = ""
 
 OFFEN_ACCOUNT_ID = "5ec8345a-2a45-4eb9-92e5-8d9e5684db58"

homepage/requirements.txt

@@ -1,2 +1,4 @@
 pelican==4.0.1
 markdown==3.1.1
+webassets==0.12.1
+cssmin==0.2.0

homepage/theme/static/scripts/fade.js

@@ -1,3 +1,7 @@
-$(window).scroll(function(){
+;(function ($) {
-    $(".brand-index").css("opacity", 0 + $(window).scrollTop() / 100);
+  $(document).ready(function () {
-  });
+    $(window).scroll(function () {
+      $('.brand-index').css('opacity', 0 + $(window).scrollTop() / 100)
+    })
+  })
+})(window.jQuery)

homepage/theme/static/scripts/menu.js

@@ -1,18 +1,16 @@
-(function($) {
+;(function ($) {
-  $(function() {
+  $(function () {
-    $('nav ul li a:not(:only-child)').click(function(e) {
+    $('nav ul li a:not(:only-child)').click(function (e) {
-      $(this).siblings('.nav-dropdown').toggle();
+      $(this).siblings('.nav-dropdown').toggle()
-      $('.dropdown').not($(this).siblings()).hide();
+      $('.dropdown').not($(this).siblings()).hide()
-      e.stopPropagation();
+      e.stopPropagation()
-    });
+    })
-    $('html').click(function() {
+    $('html').click(function () {
-      $('.nav-dropdown').hide();
+      $('.nav-dropdown').hide()
-    });
+    })
-    $('#nav-toggle').click(function() {
+    $('#nav-toggle').click(function () {
-      $('nav ul').slideToggle();
+      $(this).closest('nav').find('ul').slideToggle()
-    });
+      $(this).toggleClass('active')
-    $('#nav-toggle').on('click', function() {
+    })
-      this.classList.toggle('active');
+  })
-    });
+})(window.jQuery)
-  });
-})(jQuery);

homepage/theme/templates/base.html

@@ -17,12 +17,9 @@
   <meta name="twitter:card" content="summary_large_image">
   <link rel="canonical" href="{{ SITEURL }}/{{ page.save_as }}">
   <link rel="shortcut icon" type="image/x-icon" href="/theme/images/favicon.ico">
-  <link rel="stylesheet" type="text/css" href="/theme/css/normalize.css">
+  {% assets filters="cssmin", output="css/style.min.css", "css/normalize.css", "css/fonts.css", "css/style.css" %}
-  <link rel="stylesheet" type="text/css" href="/theme/css/fonts.css">
+      <link rel="stylesheet" href="{{ SITEURL }}/{{ ASSET_URL }}">
-  <!--
+  {% endassets %}
-  <link rel="stylesheet" type="text/css" href="/theme/styles/index.css">
-  -->
-  <link rel="stylesheet" type="text/css" href="/theme/css/style.css">
   {% if OFFEN_ACCOUNT_ID %}
     <script async src="https://script-alpha.offen.dev/script.js" data-account-id="{{ OFFEN_ACCOUNT_ID }}"></script>
   {% endif %}
@@ -40,7 +37,7 @@
           <a href="/"><img src="/theme/images/offen-brand-white.svg" alt="offen logo" width="42" height="46" class="logo"></a>
         </div>
         <nav>
-          <div class="nav-mobile"><a id="nav-toggle" href="#!"><span></span></a></div>
+          <div class="nav-mobile"><span id="nav-toggle"><span></span></span></div>
           <ul class="nav-list">
             <li>
               <a href="/">Summary</a>
@@ -240,9 +237,8 @@
       </div>
     </div>
   </div>
-  <script src="/theme/scripts/jquery-3.4.1.min.js"></script>
+  {% assets filters="rjsmin", output="scripts/packed.js", "scripts/jquery-3.4.1.min.js", "scripts/menu.js", "scripts/fade.js" %}
-  <script src="/theme/scripts/menu.js"></script>
+      <script src="{{ SITEURL }}/{{ ASSET_URL }}"></script>
-  <script src="/theme/scripts/fade.js"></script>
+  {% endassets %}
-
 </body>
 </html>