Revert "Merge pull request #735 from excid3/improve-insert-into-file"

This reverts commit 0d3a1dd, reversing
changes made to ae18824.

This breaks case when the regular expression passed to after and before
contains capture.

Since `String#split` returns the captures inside the array we can't know
with the current implementation what is the before and after the regular
expression.

Author: rafaelfranca

lib/thor/actions/inject_into_file.rb

@@ -107,10 +107,7 @@ def say_status(behavior, warning: nil, color: nil)
       #
       def replace!(regexp, string, force)
         content = File.read(destination)
-        before, after = content.split(regexp, 2)
-        snippet = (behavior == :after ? after : before).to_s
-
-        if force || !snippet.include?(replacement)
+        if force || !content.include?(replacement)
           success = content.gsub!(regexp, string)
 
           File.open(destination, "wb") { |file| file.write(content) } unless pretend?

spec/actions/inject_into_file_spec.rb

@@ -34,21 +34,11 @@ def file
       expect(File.read(file)).to eq("__start__\nmore content\nREADME\n__end__\n")
     end
 
-    it "ignores duplicates before the after flag" do
-      invoke! "doc/README", "\nREADME", :after => "README"
-      expect(File.read(file)).to eq("__start__\nREADME\nREADME\n__end__\n")
-    end
-
     it "changes the file adding content before the flag" do
       invoke! "doc/README", "more content\n", :before => "__end__"
       expect(File.read(file)).to eq("__start__\nREADME\nmore content\n__end__\n")
     end
 
-    it "ignores duplicates before the before flag" do
-      invoke! "doc/README", "README\n", :before => "README"
-      expect(File.read(file)).to eq("__start__\nREADME\nREADME\n__end__\n")
-    end
-
     it "appends content to the file if before and after arguments not provided" do
       invoke!("doc/README", "more content\n")
       expect(File.read(file)).to eq("__start__\nREADME\n__end__\nmore content\n")
@@ -97,6 +87,34 @@ def file
       expect(File.read(file)).to eq("__start__\nREADME\nmore content\n__end__\n")
     end
 
+    it "does not change the file if already includes content using before with capture" do
+      invoke! "doc/README", :before => /(__end__)/ do
+        "more content\n"
+      end
+
+      expect(File.read(file)).to eq("__start__\nREADME\nmore content\n__end__\n")
+
+      invoke! "doc/README", :before => /(__end__)/ do
+        "more content\n"
+      end
+
+      expect(File.read(file)).to eq("__start__\nREADME\nmore content\n__end__\n")
+    end
+
+    it "does not change the file if already includes content using after with capture" do
+      invoke! "doc/README", :after => /(README\n)/ do
+        "more content\n"
+      end
+
+      expect(File.read(file)).to eq("__start__\nREADME\nmore content\n__end__\n")
+
+      invoke! "doc/README", :after => /(README\n)/ do
+        "more content\n"
+      end
+
+      expect(File.read(file)).to eq("__start__\nREADME\nmore content\n__end__\n")
+    end
+
     it "does not attempt to change the file if it doesn't exist - instead raises Thor::Error" do
       expect do
         invoke! "idontexist", :before => "something" do