Embed sourcesContent in source maps

CHANGELOG.md

@@ -5,6 +5,7 @@ Get upgrade notes from Sprockets 3.x to 4.x at https://github.com/rails/sprocket
 ## Master
 
 - Remove remaining support for Ruby < 2.4.[#672](https://github.com/rails/sprockets/pull/672)
+- Embed sourcesContent in source maps. [#697](https://github.com/rails/sprockets/pull/697)
 
 ## 4.0.2
 

lib/sprockets/preprocessors/default_source_map.rb

@@ -15,14 +15,12 @@ def call(input)
         load_path     = input[:load_path]
         lines         = input[:data].lines.length
         basename      = File.basename(filename)
-        mime_exts     = input[:environment].config[:mime_exts]
-        pipeline_exts = input[:environment].config[:pipeline_exts]
         if map.nil? || map.empty?
           result[:map] = {
             "version"   => 3,
             "file"      => PathUtils.split_subpath(load_path, filename),
             "mappings"  => default_mappings(lines),
-            "sources"   => [PathUtils.set_pipeline(basename, mime_exts, pipeline_exts, :source)],
+            "sources"   => [basename],
             "names"     => []
           }
         else

lib/sprockets/source_map_processor.rb

@@ -38,12 +38,17 @@ def self.call(input)
       dependencies.merge(asset.metadata[:dependencies])
 
       map["file"] = PathUtils.split_subpath(input[:load_path], input[:filename])
-      sources = map["sections"] ? map["sections"].map { |s| s["map"]["sources"] }.flatten : map["sources"]
+      sections = map["sections"] ? map["sections"] : [{ "map" => map }]
+      sections.each do |section|
+        section["map"]["sourcesContent"] = section["map"]["sources"].map do |source|
+          source = PathUtils.join(File.dirname(map["file"]), source)
+          uri, _ = env.resolve!(source)
+          next nil unless uri.start_with? "file://"
 
-      sources.each do |source|
-        source = PathUtils.join(File.dirname(map["file"]), source)
-        uri, _ = env.resolve!(source)
-        links << uri
+          path = URIUtils.split_file_uri(uri)[2]
+          next nil unless File.exist?(path)
+          File.read(path)
+        end
       end
 
       json = JSON.generate(map)

lib/sprockets/source_map_utils.rb

@@ -38,8 +38,6 @@ def format_source_map(map, input)
       filename      = input[:filename]
       load_path     = input[:load_path]
       load_paths    = input[:environment].config[:paths]
-      mime_exts     = input[:environment].config[:mime_exts]
-      pipeline_exts = input[:environment].config[:pipeline_exts]
       file          = PathUtils.split_subpath(load_path, filename)
       {
         "version"  => 3,
@@ -50,7 +48,7 @@ def format_source_map(map, input)
           source = PathUtils.join(File.dirname(filename), source) unless PathUtils.absolute_path?(source)
           _, source = PathUtils.paths_split(load_paths, source)
           source = PathUtils.relative_path_from(file, source)
-          PathUtils.set_pipeline(source, mime_exts, pipeline_exts, :source)
+          source
         end,
         "names"    => map["names"]
       }

test/test_asset.rb

@@ -1147,7 +1147,7 @@ def setup
   end
 
   test "digest path" do
-    assert_equal "application.debug-dee339ce0ee2dc7cdfa0d36dff3ef946cebe1bd3e414515d40c3cafc49c0a51a.js",
+    assert_equal "application.debug-5bafea519f7aae9679023c6441b8c3623b4147cf5bca607abc5aab0c35ce6618.js",
       @asset.digest_path
   end
 
@@ -1180,7 +1180,7 @@ def setup
   $('search').focus();
 });
 
-//# sourceMappingURL=application.js-95e519d4e0f0a5c4c7d24787ded990b0d027f7ad30b39f402c4c5e3196a41e8b.map
+//# sourceMappingURL=application.js-ba55f2ffb2663c056b196f7874897ca13fc2fb892dfdda1f9535d105e3c9ee25.map
 EOS
 
     assert_equal expected, @asset.to_s

test/test_coffee_script_processor.rb

@@ -25,7 +25,8 @@ def test_compile_coffee_script_template_to_js
     result = Sprockets::CoffeeScriptProcessor.call(input)
     assert result[:data].match(/var square/)
     assert_equal 13, Sprockets::SourceMapUtils.decode_source_map(result[:map])[:mappings].size
-    assert_equal ["squared.source.coffee"], result[:map]["sources"]
+    assert_equal ["squared.coffee"], result[:map]["sources"]
+    assert_nil result[:map]["sourcesContent"]
   end
 
   def test_cache_key