Implement `file_replace_content' task action

lib/producer/core/actions/file_replace_content.rb

@@ -0,0 +1,27 @@
+module Producer
+  module Core
+    module Actions
+      class FileReplaceContent < Action
+        def apply
+          fs.file_write path, replaced_content
+        end
+
+        def path
+          arguments[0]
+        end
+
+        def pattern
+          arguments[1]
+        end
+
+        def replacement
+          arguments[2]
+        end
+
+        def replaced_content
+          fs.file_read(path).gsub pattern, replacement
+        end
+      end
+    end
+  end
+end

lib/producer/core/task/dsl.rb

@@ -13,8 +13,9 @@ module Producer
         define_action :echo,  Actions::Echo
         define_action :sh,    Actions::ShellCommand
 
-        define_action :mkdir,       Actions::Mkdir
-        define_action :file_write,  Actions::FileWriter
+        define_action :mkdir,                 Actions::Mkdir
+        define_action :file_write,            Actions::FileWriter
+        define_action :file_replace_content,  Actions::FileReplaceContent
 
         attr_reader :env, :block, :actions