[feature] Add inline assets option

lib/simplecov-html.rb

@@ -5,6 +5,7 @@
 require "fileutils"
 require "digest/sha1"
 require "time"
+require "base64"
 
 # Ensure we are using a compatible version of SimpleCov
 major, minor, patch = SimpleCov::VERSION.scan(/\d+/).first(3).map(&:to_i)
@@ -19,11 +20,15 @@ class HTMLFormatter
       def initialize
         @branchable_result = SimpleCov.branch_coverage?
         @templates = {}
+        @inline_assets = !ENV["SIMPLECOV_INLINE_ASSETS"].nil?
+        @public_assets_dir = File.join(File.dirname(__FILE__), "../public/")
       end
 
       def format(result)
-        Dir[File.join(File.dirname(__FILE__), "../public/*")].each do |path|
-          FileUtils.cp_r(path, asset_output_path)
+        unless @inline_assets
+          Dir[File.join(@public_assets_dir, "*")].each do |path|
+            FileUtils.cp_r(path, asset_output_path)
+          end
         end
 
         File.open(File.join(output_path, "index.html"), "wb") do |file|
@@ -71,9 +76,26 @@ def asset_output_path
       end
 
       def assets_path(name)
+        return asset_inline(name) if @inline_assets
+
         File.join("./assets", SimpleCov::Formatter::HTMLFormatter::VERSION, name)
       end
 
+      def asset_inline(name)
+        path = File.join(@public_assets_dir, name)
+
+        # Only have a few content types, just hardcode them
+        content_type = {
+          ".js" => "text/javascript",
+          ".png" => "image/png",
+          ".gif" => "image/gif",
+          ".css" => "text/css",
+        }[File.extname(name)]
+
+        base64_content = Base64.strict_encode64 File.open(path).read
+        "data:#{content_type};base64,#{base64_content}"
+      end
+
       # Returns the html for the given source_file
       def formatted_source_file(source_file)
         template("source_file").result(binding)