Don't rely on filename for config reads (#47)

* Don't rely on filename for config reads

* Fix rubocop

* Fix smoke tests

Author: iHiD

lib/represent_solution.rb

@@ -1,10 +1,11 @@
+require 'json'
+
 class RepresentSolution
   include Mandate
 
   initialize_with :exercise_slug, :solution_path, :output_path
 
   def call
-    code = File.read(solution_path / "#{exercise_slug.tr('-', '_')}.rb")
     representation = Representation.new(code)
     representation.normalize!
 
@@ -16,4 +17,15 @@ def call
       f.write(representation.mapping.to_json)
     end
   end
+
+  memoize
+  def code
+    filenames.map { |filename| File.read(solution_path / filename) }.join(" ")
+  end
+
+  memoize
+  def filenames
+    config = JSON.parse(File.read(solution_path / '.meta' / 'config.json'))
+    config['files']['solution']
+  end
 end

test/represent_solution_test.rb

@@ -4,14 +4,19 @@ class RepresentateSolutionTest < Minitest::Test
   def test_extracts_and_writes_code_correctly
     code = "some code"
     ast = "some representation"
+    code_filepath = "foooooo.rb"
     mapping = { foo: 'bar' }
     representation = mock
     representation.stubs(ast:)
     representation.stubs(mapping:)
     representation.expects(:normalize!)
 
+    config = { files: { solution: [code_filepath] } }.to_json
+
     Representation.expects(:new).with(code).returns(representation)
-    File.expects(:read).with(SOLUTION_PATH / "two_fer.rb").returns(code)
+    File.expects(:read).with(SOLUTION_PATH / ".meta/config.json").returns(config)
+
+    File.expects(:read).with(SOLUTION_PATH / code_filepath).returns(code)
     writer = mock
     writer.expects(:write).with(ast)
     File.expects(:open).

test/representer_test.rb

@@ -16,6 +16,9 @@ def test_that_it_converts_to_path_and_runs
 
   def test_e2e
     Dir.mktmpdir("code") do |dir|
+      Dir.mkdir("#{dir}/.meta")
+      File.write("#{dir}/.meta/config.json", { files: { solution: ['lasagna.rb'] } }.to_json)
+
       File.write("#{dir}/lasagna.rb", '
         class Lasagna
           EXPECTED_MINUTES_IN_OVEN = 40

tests/examples/basic/.meta/config.json

@@ -0,0 +1 @@
+{ "files": { "solution": ["basic.rb"] } }

tests/examples/lasagna/.meta/config.json

@@ -0,0 +1,2 @@
+{ "files": { "solution": ["lasagna.rb"] } }
+