Do not remove magic comments (AnnotateRoutes) (#520)

lib/annotate/annotate_routes.rb

@@ -38,7 +38,13 @@ module AnnotateRoutes
     def header(options = {})
       routes_map = app_routes_map(options)
 
+      magic_comments_map, routes_map = extract_magic_comments_from_array(routes_map)
       out = []
+
+      magic_comments_map.each do |magic_comment|
+        out << magic_comment
+      end
+
       out += ["# #{options[:wrapper_open]}"] if options[:wrapper_open]
 
       out += ["# #{options[:format_markdown] ? PREFIX_MD : PREFIX}" + (options[:timestamp] ? " (Updated #{Time.now.strftime('%Y-%m-%d %H:%M')})" : '')]
@@ -82,6 +88,28 @@ module AnnotateRoutes
     end
   end
 
+  def self.magic_comment_matcher
+    Regexp.new(/(^#\s*encoding:.*)|(^# coding:.*)|(^# -\*- coding:.*)|(^# -\*- encoding\s?:.*)|(^#\s*frozen_string_literal:.+)|(^# -\*- frozen_string_literal\s*:.+-\*-)/)
+  end
+
+  # @param [Array<String>] content
+  # @return [Array<String>] all found magic comments
+  # @return [Array<String>] content without magic comments
+  def self.extract_magic_comments_from_array(content_array)
+    magic_comments = []
+    new_content = []
+
+    content_array.map do |row|
+      if row =~ magic_comment_matcher
+        magic_comments << row.strip
+      else
+        new_content << row
+      end
+    end
+
+    [magic_comments, new_content]
+  end
+
   def self.app_routes_map(options)
     routes_map = `rake routes`.chomp("\n").split(/\n/, -1)
 
@@ -143,9 +171,10 @@ module AnnotateRoutes
   end
 
   def self.annotate_routes(header, content, where_header_found, options = {})
+    magic_comments_map, content = extract_magic_comments_from_array(content)
     if %w(before top).include?(options[:position_in_routes])
       header = header << '' if content.first != ''
-      new_content = header + content
+      new_content = magic_comments_map + header + content
     else
       # Ensure we have adequate trailing newlines at the end of the file to
       # ensure a blank line separating the content from the annotation.
@@ -155,7 +184,7 @@ module AnnotateRoutes
       # the spacer we put in the first time around.
       content.shift if where_header_found == :before && content.first == ''
 
-      new_content = content + header
+      new_content = magic_comments_map + content + header
     end
 
     new_content

spec/annotate/annotate_routes_spec.rb

@@ -11,6 +11,22 @@ describe AnnotateRoutes do
     @mock_file ||= double(File, stubs)
   end
 
+  def magic_comments_list_each
+    [
+      '# encoding: UTF-8',
+      '# coding: UTF-8',
+      '# -*- coding: UTF-8 -*-',
+      '#encoding: utf-8',
+      '# encoding: utf-8',
+      '# -*- encoding : utf-8 -*-',
+      "# encoding: utf-8\n# frozen_string_literal: true",
+      "# frozen_string_literal: true\n# encoding: utf-8",
+      '# frozen_string_literal: true',
+      '#frozen_string_literal: false',
+      '# -*- frozen_string_literal : true -*-'
+    ].each { |magic_comment| yield magic_comment }
+  end
+
   it 'should check if routes.rb exists' do
     expect(File).to receive(:exists?).with(ROUTE_FILE).and_return(false)
     expect(AnnotateRoutes).to receive(:puts).with("Can't find routes.rb")
@@ -18,21 +34,29 @@ describe AnnotateRoutes do
   end
 
   describe 'Annotate#example' do
-    before(:each) do
-      expect(File).to receive(:exists?).with(ROUTE_FILE).and_return(true)
-
-      expect(File).to receive(:read).with(ROUTE_FILE).and_return("")
-      expect(AnnotateRoutes).to receive(:`).with('rake routes').and_return("                                      Prefix Verb       URI Pattern                                               Controller#Action
+    let(:rake_routes_content) do
+      "                                      Prefix Verb       URI Pattern                                               Controller#Action
                                    myaction1 GET        /url1(.:format)                                           mycontroller1#action
                                    myaction2 POST       /url2(.:format)                                           mycontroller2#action
-                                   myaction3 DELETE|GET /url3(.:format)                                           mycontroller3#action\n")
+                                   myaction3 DELETE|GET /url3(.:format)                                           mycontroller3#action\n"
+    end
 
-      expect(AnnotateRoutes).to receive(:puts).with(ANNOTATION_ADDED)
+    before(:each) do
+      expect(File).to receive(:exists?).with(ROUTE_FILE).and_return(true).at_least(:once)
+
+      expect(File).to receive(:read).with(ROUTE_FILE).and_return("").at_least(:once)
+
+      expect(AnnotateRoutes).to receive(:puts).with(ANNOTATION_ADDED).at_least(:once)
     end
 
-    it 'annotate normal' do
-      expect(File).to receive(:open).with(ROUTE_FILE, 'wb').and_yield(mock_file)
-      expect(@mock_file).to receive(:puts).with("
+    context 'without magic comments' do
+      before(:each) do
+        expect(AnnotateRoutes).to receive(:`).with('rake routes').and_return(rake_routes_content)
+      end
+
+      it 'annotate normal' do
+        expect(File).to receive(:open).with(ROUTE_FILE, 'wb').and_yield(mock_file)
+        expect(@mock_file).to receive(:puts).with("
 # == Route Map
 #
 #                                       Prefix Verb       URI Pattern                                               Controller#Action
@@ -40,12 +64,12 @@ describe AnnotateRoutes do
 #                                    myaction2 POST       /url2(.:format)                                           mycontroller2#action
 #                                    myaction3 DELETE|GET /url3(.:format)                                           mycontroller3#action\n")
 
-      AnnotateRoutes.do_annotations
-    end
+        AnnotateRoutes.do_annotations
+      end
 
-    it 'annotate markdown' do
-      expect(File).to receive(:open).with(ROUTE_FILE, 'wb').and_yield(mock_file)
-      expect(@mock_file).to receive(:puts).with("
+      it 'annotate markdown' do
+        expect(File).to receive(:open).with(ROUTE_FILE, 'wb').and_yield(mock_file)
+        expect(@mock_file).to receive(:puts).with("
 # ## Route Map
 #
 # Prefix    | Verb       | URI Pattern     | Controller#Action   
@@ -54,12 +78,72 @@ describe AnnotateRoutes do
 # myaction2 | POST       | /url2(.:format) | mycontroller2#action
 # myaction3 | DELETE-GET | /url3(.:format) | mycontroller3#action\n")
 
-      AnnotateRoutes.do_annotations(format_markdown: true)
+        AnnotateRoutes.do_annotations(format_markdown: true)
+      end
+
+      it 'wraps annotation if wrapper is specified' do
+        expect(File).to receive(:open).with(ROUTE_FILE, 'wb').and_yield(mock_file)
+        expect(@mock_file).to receive(:puts).with("
+# START
+# == Route Map
+#
+#                                       Prefix Verb       URI Pattern                                               Controller#Action
+#                                    myaction1 GET        /url1(.:format)                                           mycontroller1#action
+#                                    myaction2 POST       /url2(.:format)                                           mycontroller2#action
+#                                    myaction3 DELETE|GET /url3(.:format)                                           mycontroller3#action
+# END\n")
+
+        AnnotateRoutes.do_annotations(wrapper_open: 'START', wrapper_close: 'END')
+      end
     end
 
-    it 'wraps annotation if wrapper is specified' do
-      expect(File).to receive(:open).with(ROUTE_FILE, 'wb').and_yield(mock_file)
-      expect(@mock_file).to receive(:puts).with("
+    context 'file with magic comments' do
+      it 'should not remove magic comments' do
+        magic_comments_list_each do |magic_comment|
+          expect(AnnotateRoutes).to receive(:`).with('rake routes')
+            .and_return("#{magic_comment}\n#{rake_routes_content}")
+
+          expect(File).to receive(:open).with(ROUTE_FILE, 'wb').and_yield(mock_file)
+          expect(@mock_file).to receive(:puts).with("
+#{magic_comment}
+# == Route Map
+#
+#                                       Prefix Verb       URI Pattern                                               Controller#Action
+#                                    myaction1 GET        /url1(.:format)                                           mycontroller1#action
+#                                    myaction2 POST       /url2(.:format)                                           mycontroller2#action
+#                                    myaction3 DELETE|GET /url3(.:format)                                           mycontroller3#action\n")
+
+          AnnotateRoutes.do_annotations
+        end
+      end
+
+      it 'annotate markdown' do
+        magic_comments_list_each do |magic_comment|
+          expect(AnnotateRoutes).to receive(:`).with('rake routes')
+            .and_return("#{magic_comment}\n#{rake_routes_content}")
+
+          expect(File).to receive(:open).with(ROUTE_FILE, 'wb').and_yield(mock_file)
+          expect(@mock_file).to receive(:puts).with("
+#{magic_comment}
+# ## Route Map
+#
+# Prefix    | Verb       | URI Pattern     | Controller#Action   
+# --------- | ---------- | --------------- | --------------------
+# myaction1 | GET        | /url1(.:format) | mycontroller1#action
+# myaction2 | POST       | /url2(.:format) | mycontroller2#action
+# myaction3 | DELETE-GET | /url3(.:format) | mycontroller3#action\n")
+
+          AnnotateRoutes.do_annotations(format_markdown: true)
+        end
+      end
+
+      it 'wraps annotation if wrapper is specified' do
+        magic_comments_list_each do |magic_comment|
+          expect(AnnotateRoutes).to receive(:`).with('rake routes')
+            .and_return("#{magic_comment}\n#{rake_routes_content}")
+          expect(File).to receive(:open).with(ROUTE_FILE, 'wb').and_yield(mock_file)
+          expect(@mock_file).to receive(:puts).with("
+#{magic_comment}
 # START
 # == Route Map
 #
@@ -69,14 +153,18 @@ describe AnnotateRoutes do
 #                                    myaction3 DELETE|GET /url3(.:format)                                           mycontroller3#action
 # END\n")
 
-      AnnotateRoutes.do_annotations(wrapper_open: 'START', wrapper_close: 'END')
+          AnnotateRoutes.do_annotations(wrapper_open: 'START', wrapper_close: 'END')
+        end
+      end
     end
   end
 
   describe 'When adding' do
     before(:each) do
-      expect(File).to receive(:exists?).with(ROUTE_FILE).and_return(true)
-      expect(AnnotateRoutes).to receive(:`).with('rake routes').and_return('')
+      expect(File).to receive(:exists?).with(ROUTE_FILE)
+        .and_return(true).at_least(:once)
+      expect(AnnotateRoutes).to receive(:`).with('rake routes')
+        .and_return('').at_least(:once)
     end
 
     it 'should insert annotations if file does not contain annotations' do
@@ -112,6 +200,42 @@ describe AnnotateRoutes do
 
       AnnotateRoutes.do_annotations
     end
+
+    context 'file with magic comments' do
+      it 'leaves magic comment on top, adds an empty line between magic comment and annotation (position_in_routes :top)' do
+        expect(File).to receive(:open).with(ROUTE_FILE, 'wb')
+          .and_yield(mock_file).at_least(:once)
+
+        magic_comments_list_each do |magic_comment|
+          expect(File).to receive(:read).with(ROUTE_FILE).and_return("#{magic_comment}\nSomething")
+          expect(@mock_file).to receive(:puts).with("#{magic_comment}\n# == Route Map\n#\n\nSomething\n")
+          expect(AnnotateRoutes).to receive(:puts).with(ANNOTATION_ADDED)
+          AnnotateRoutes.do_annotations(position_in_routes: 'top')
+        end
+      end
+
+      it 'leaves magic comment on top, adds an empty line between magic comment and annotation (position_in_routes :bottom)' do
+        expect(File).to receive(:open).with(ROUTE_FILE, 'wb')
+          .and_yield(mock_file).at_least(:once)
+
+        magic_comments_list_each do |magic_comment|
+          expect(File).to receive(:read).with(ROUTE_FILE).and_return("#{magic_comment}\nSomething")
+          expect(@mock_file).to receive(:puts).with("#{magic_comment}\nSomething\n\n# == Route Map\n#\n")
+          expect(AnnotateRoutes).to receive(:puts).with(ANNOTATION_ADDED)
+          AnnotateRoutes.do_annotations(position_in_routes: 'bottom')
+        end
+      end
+
+      it 'skips annotations if file does already contain annotation' do
+        magic_comments_list_each do |magic_comment|
+          expect(File).to receive(:read).with(ROUTE_FILE)
+            .and_return("#{magic_comment}\n\n# == Route Map\n#\n")
+          expect(AnnotateRoutes).to receive(:puts).with(FILE_UNCHANGED)
+
+          AnnotateRoutes.do_annotations
+        end
+      end
+    end
   end
 
   describe 'When adding with older Rake versions' do