From 957b68e71371352b4e26b1ba0a92fd611321503c Mon Sep 17 00:00:00 2001
From: Aleksandar Kostadinov <akostadi@redhat.com>
Date: Feb 26 2017 17:04:50 +0000
Subject: css autoprefixer


---

diff --git a/_config/site.yml b/_config/site.yml
index 3078a28..c7e6814 100644
--- a/_config/site.yml
+++ b/_config/site.yml
@@ -13,3 +13,6 @@ slim:
 # asciidoctor:
 #   :backend: html5
 #   :safe: 1
+
+autoprefixer:
+  :browsers: ['> 1%', 'ie 10']
diff --git a/_ext/css_autoprefixer.rb b/_ext/css_autoprefixer.rb
new file mode 100644
index 0000000..6ac12bd
--- /dev/null
+++ b/_ext/css_autoprefixer.rb
@@ -0,0 +1,40 @@
+require 'autoprefixer-rails'
+
+class CSSAutoPrefixer
+  def initialize
+    if ExecJS.runtime.name.start_with? "therubyracer"
+      $LOG.warn "WARNING: ExecJS is using 'therubyracer' backend. " \
+        "My testing shows it usually deadlocking due to threaded " \
+        "execution here (tested with 0.12.3). " \
+        "AutoPrefixer and Awestruct coffee handler are both using " \
+        "ExecJS and there seems to be some concurrency issue with " \
+        "'therubyracer'. See https://github.com/cowboyd/therubyracer/issues/432"
+    end
+  end
+
+  def transform(site, page, input)
+    if page.output_extension == '.css'
+      fix_encoding(input)
+      input = AutoprefixerRails.process(
+        input,
+        from: page.source_path,
+        **site.autoprefixer
+      ).css
+    end
+    return input
+  end
+
+  # some files throw "An error occurred: "\xE2" from ASCII-8BIT to UTF-8" when
+  #   processed with ExecJS/nodejs backend like this one:
+  #   https://github.com/HubSpot/tether/blob/ad295ad/docs/css/intro.css
+  def fix_encoding(str)
+    if str.encoding == ::Encoding::ASCII_8BIT
+      f_enc = str.match(/\A@charset "([-A-Za-z0-9_]+)";/)
+      if f_enc && f_enc[1]
+        str.force_encoding(::Encoding.find(f_enc[1]))
+      else
+        str.force_encoding(::Encoding.default_external)
+      end
+    end
+  end
+end
diff --git a/_ext/js_require_transformer.rb b/_ext/js_require_transformer.rb
index 3310367..b1254e2 100644
--- a/_ext/js_require_transformer.rb
+++ b/_ext/js_require_transformer.rb
@@ -2,8 +2,7 @@ class JSRequireTransformer
   MONKEY_MUTEX = Mutex.new
 
   def transform(site, page, input)
-    ext = File.extname(page.output_path)
-    if ext == '.js'
+    if page.output_extension == '.js'
       input = input.gsub(%r{^//= require ([-/_.a-zA-Z0-9]*)$}) { |m|
         c = get_required_file "#{$1}.js", site
         c ? transform(site, page, c) : m # recurse if transformation happened
diff --git a/_ext/pipeline.rb b/_ext/pipeline.rb
index a31ab55..c1b7265 100644
--- a/_ext/pipeline.rb
+++ b/_ext/pipeline.rb
@@ -1,6 +1,7 @@
 require 'bootstrap'
 
 require 'bootstrap_gem_js'
+require 'css_autoprefixer'
 require 'js_require_transformer'
 
 # done instead in _config/site.yml
@@ -11,6 +12,7 @@ Awestruct::Extensions::Pipeline.new do
   helper Awestruct::Extensions::Relative
 
   transformer JSRequireTransformer.new
+  transformer CSSAutoPrefixer.new
   # extension BootstrapGemJS.new
 
   # extension Awestruct::Extensions::Posts.new '/news'