Added liquid tag for slim to render as _include

lib/jekyll-slim.rb

@@ -1,5 +1,6 @@
 require 'slim'
 require 'jekyll-slim/version'
+require 'jekyll-slim/tags/slim_partial'
 require 'jekyll-slim/ext/convertible'
 
 module Jekyll

lib/jekyll-slim/tags/slim_partial.rb

@@ -0,0 +1,50 @@
+require 'slim'
+
+module Jekyll
+  class SlimPartialTag < Liquid::Tag
+    def initialize(tag_name, file, tokens)
+      super
+      @file = file.strip
+    end
+
+    def render(context)
+      includes_dir = File.join(context.registers[:site].source, '_includes')
+
+      if File.symlink?(includes_dir)
+        return "Includes directory '#{includes_dir}' cannot be a symlink"
+      end
+
+      if @file !~ /^[a-zA-Z0-9_\/\.-]+$/ || @file =~ /\.\// || @file =~ /\/\./
+        return "Include file '#{@file}' contains invalid characters or sequences"
+      end
+
+      return "File must have \".slim\" extension" if @file !~ /\.slim$/
+
+      Dir.chdir(includes_dir) do
+        choices = Dir['**/*'].reject { |x| File.symlink?(x) }
+        if choices.include?(@file)
+          source = File.read(@file)
+          conversion = ::Slim::Template.new{ source }.render
+          partial = Liquid::Template.parse(conversion)
+          begin
+            return partial.render!(context)
+          rescue => e
+            puts "Liquid Exception: #{e.message} in #{self.data["layout"]}"
+            e.backtrace.each do |backtrace|
+              puts backtrace
+            end
+            abort("Build Failed")
+          end
+
+          context.stack do
+            return partial.render(context)
+          end
+        else
+          "Included file '#{@file}' not found in _includes directory"
+        end
+      end
+    end
+  end
+end
+
+Liquid::Template.register_tag('slim', Jekyll::SlimPartialTag)