Fix #inject_into_file warning when replacement is already present in file

Author: nicolas-brousse

lib/thor/actions/inject_into_file.rb

@@ -59,6 +59,8 @@ def invoke!
         if exists?
           if replace!(/#{flag}/, content, config[:force])
             say_status(:invoke)
+          elsif replacement_present?
+            say_status(:unchanged, color: :blue)
           else
             say_status(:unchanged, warning: WARNINGS[:unchanged_no_flag], color: :red)
           end
@@ -96,18 +98,27 @@ def say_status(behavior, warning: nil, color: nil)
           end
         elsif warning
           warning
+        elsif behavior == :unchanged
+          :unchanged
         else
           :subtract
         end
 
         super(status, (color || config[:verbose]))
       end
 
+      def content
+        @content ||= File.read(destination)
+      end
+
+      def replacement_present?
+        content.include?(replacement)
+      end
+
       # Adds the content to the file.
       #
       def replace!(regexp, string, force)
-        content = File.read(destination)
-        if force || !content.include?(replacement)
+        if force || !replacement_present?
           success = content.gsub!(regexp, string)
 
           File.open(destination, "wb") { |file| file.write(content) } unless pretend?

spec/actions/inject_into_file_spec.rb

@@ -44,6 +44,13 @@ def file
       expect(File.read(file)).to eq("__start__\nREADME\n__end__\nmore content\n")
     end
 
+    it "does not change the file if replacement present in the file" do
+      invoke!("doc/README", "more specific content\n")
+      expect(invoke!("doc/README", "more specific content\n")).to(
+        eq("   unchanged  doc/README\n")
+      )
+    end
+
     it "does not change the file and logs the warning if flag not found in the file" do
       expect(invoke!("doc/README", "more content\n", after: "whatever")).to(
         eq("#{Thor::Actions::WARNINGS[:unchanged_no_flag]}  doc/README\n")