Download version information for all implementations

.gitignore

@@ -9,7 +9,9 @@ bundle
 /Icon
 "Icon\r"
 .ruby-version
-/.sass
+/.dart-sass
+/.libsass
+/.ruby-sass
 /.sass-cache
 *.scssc
 /source/assets/css/vendor

Gemfile

@@ -17,6 +17,7 @@ gem 'rack-contrib'
 gem 'rack-rewrite'
 gem 'rake'
 gem 'redcarpet',              '~> 3.3.3'
+gem 'semantic',               '~> 1.6'
 gem 'susy',                   '~> 2.2.9'
 gem 'therubyracer',           '~> 0.12.3'
 gem 'typogruby',              '~> 1.0.18'

Gemfile.lock

@@ -136,6 +136,7 @@ GEM
     sass (3.4.25)
     sassy-maps (0.4.0)
       sass (~> 3.3)
+    semantic (1.6.1)
     sprockets (2.12.4)
       hike (~> 1.2)
       multi_json (~> 1.0)
@@ -187,6 +188,7 @@ DEPENDENCIES
   rack-rewrite
   rake
   redcarpet (~> 3.3.3)
+  semantic (~> 1.6)
   susy (~> 2.2.9)
   therubyracer (~> 0.12.3)
   typogruby (~> 1.0.18)
@@ -198,4 +200,4 @@ RUBY VERSION
    ruby 2.4.1p111
 
 BUNDLED WITH
-   1.15.2
+   1.16.1

Rakefile

@@ -1,16 +1,85 @@
+require 'semantic'
+require 'yaml'
 require 'yard'
 
 namespace :sass do
-  # Check out the latest stable version of Ruby Sass into the .sass directory.
-  task :checkout do
-    unless Dir.exists?(".sass")
-      sh %{git clone git://github.com/sass/sass .sass}
+  # Adds an implementation's version number to data/version.yml.
+  def add_version(impl, version)
+    path = 'data/version.yml'
+    yaml = File.exist?(path) ? YAML.load(File.read(path)) : {}
+    yaml[impl] = version
+    File.open(path, 'w') {|f| f.write(YAML.dump(yaml))}
   end
 
-    Dir.chdir(".sass") do
+  # Returns the latest tag in the current Git repository that's a valid semantic
+  # version and is not a pre-release version *unless* only pre-release versions
+  # are available.
+  def latest_stable_tag
+    tags = `git tag`.strip.split("\n").map do |v|
+      begin
+        Semantic::Version.new(v)
+      rescue ArgumentError
+        nil
+      end
+    end.compact.sort.reverse
+    (tags.find {|t| !t.pre} || tags.first).to_s
+  end
+
+  namespace :dart do
+    # Check out the latest commit of Dart Sass into the .dart-sass directory.
+    task :checkout do
+      unless Dir.exists?(".dart-sass")
+        sh %{git clone git://github.com/sass/dart-sass .dart-sass}
+      end
+
+      Dir.chdir(".dart-sass") do
         sh %{git fetch}
-      if ENV["SASS_REVISION"]
-        sh %{git checkout #{ENV["SASS_REVISION"]}}
+        if ENV["DART_SASS_REVISION"]
+          sh %{git checkout #{ENV["DART_SASS_REVISION"]}}
+        else
+          sh %{git checkout origin/master}
+        end
+      end
+    end
+
+    task :version => :checkout do
+      add_version 'dart', Dir.chdir(".dart-sass") {latest_stable_tag}
+    end
+  end
+
+  namespace :libsass do
+    # Check out the latest commit of Dart Sass into the .libsass directory.
+    task :checkout do
+      unless Dir.exists?(".libsass")
+        sh %{git clone git://github.com/sass/libsass .libsass}
+      end
+
+      Dir.chdir(".libsass") do
+        sh %{git fetch}
+        if ENV["LIBSASS_REVISION"]
+          sh %{git checkout #{ENV["LIBSASS_REVISION"]}}
+        else
+          sh %{git checkout origin/master}
+        end
+      end
+    end
+
+    task :version => :checkout do
+      add_version 'libsass', Dir.chdir(".libsass") {latest_stable_tag}
+    end
+  end
+
+  namespace :ruby do
+    # Check out the latest stable version of Ruby Sass into the .ruby-sass directory.
+    task :checkout do
+      unless Dir.exists?(".ruby-sass")
+        sh %{git clone git://github.com/sass/sass .ruby-sass}
+      end
+
+      Dir.chdir(".ruby-sass") do
+        sh %{git fetch}
+        if ENV["RUBY_SASS_REVISION"]
+          sh %{git checkout #{ENV["RUBY_SASS_REVISION"]}}
         else
           sh %{git checkout origin/stable}
           # Check out the most recent released stable version
@@ -20,22 +89,19 @@ namespace :sass do
     end
 
     task :version => :checkout do
-    require 'yaml'
-    version = File.read(".sass/VERSION").strip
-    name = File.read(".sass/VERSION_NAME").strip
-    File.open('data/version.yml', 'w') {|f| f.write(YAML.dump({'number' => version, 'name' => name}))}
+      add_version 'ruby', File.read(".ruby-sass/VERSION").strip
     end
 
     YARD::Rake::YardocTask.new(:doc) do |t|
       t.before = lambda do
-      t.files = FileList.new('.sass/lib/**/*.rb') do |list|
-        list.exclude('.sass/lib/sass/plugin/merb.rb')
-        list.exclude('.sass/lib/sass/plugin/rails.rb')
+        t.files = FileList.new('.ruby-sass/lib/**/*.rb') do |list|
+          list.exclude('.ruby-sass/lib/sass/plugin/merb.rb')
+          list.exclude('.ruby-sass/lib/sass/plugin/rails.rb')
         end.to_a
-      t.options += FileList.new('.sass/yard/*.rb').to_a.map {|f| ['-e', f]}.flatten
-      files = FileList.new('.sass/doc-src/*').to_a.sort_by {|s| s.size} + %w[.sass/MIT-LICENSE .sass/VERSION]
+        t.options += FileList.new('.ruby-sass/yard/*.rb').to_a.map {|f| ['-e', f]}.flatten
+        files = FileList.new('.ruby-sass/doc-src/*').to_a.sort_by {|s| s.size} + %w[.ruby-sass/MIT-LICENSE .ruby-sass/VERSION]
         t.options << '--files' << files.join(',')
-      t.options << '--main' << '.sass/README.md'
+        t.options << '--main' << '.ruby-sass/README.md'
         t.options << '--template-path' << 'yard'
       end
 
@@ -83,11 +149,12 @@ namespace :sass do
         File.write('source/documentation/file.SASS_REFERENCE.html', doc.to_html)
       end
     end
-  Rake::Task['sass:doc'].prerequisites.insert(0, 'sass:checkout')
-  Rake::Task['sass:doc'].instance_variable_set('@comment', nil)
+    Rake::Task['sass:ruby:doc'].prerequisites.insert(0, 'sass:ruby:checkout')
+    Rake::Task['sass:ruby:doc'].instance_variable_set('@comment', nil)
+  end
 
-  desc "Import information from Sass."
-  task :import => [:doc, :version]
+  desc "Import information from Sass implementations."
+  task :import => ["dart:version", "libsass:version", "ruby:version", "ruby:doc"]
 end
 
 desc "Build the middleman-controlled portion of the site."
@@ -101,6 +168,6 @@ task "build" => ["sass:import", :middleman]
 # Build the site on Heroku, then clean up unnecessary intermediate files.
 task "assets:precompile" => :build do
   # Clean up unneccessary files to reduce slug size.
-  sh %{rm -rf .sass .yardoc}
+  sh %{rm -rf .dart-sass .libsass .ruby-sass .yardoc}
   sh %{bundle install --without=development}
 end

helpers/sass_helpers.rb

@@ -48,7 +48,7 @@ module SassHelpers
   # Returns the version for the given implementation (`:dart`, `:ruby`, or
   # `:libsass`), or `nil` if it hasn't been made available yet.
   def impl_version(impl)
-    nil
+    data.version && data.version[impl]
   end
 
   # Returns the URL tag for the latest release of the given implementation.