Can you look at new resource, replace_line_or_add

README.md

@@ -41,6 +41,26 @@ Or with a regex:
 		with    "vm.swappiness=60"
 	end
 
+
+replace_line_or_add
+------------
+
+Search the file line by line and match each line with the given regex if matched, replace the whole line with the replace parameter.
+If no match is found, add entry like the append_line resource
+
+        replace_line_or_add "/etc/sysctl.conf" do
+                replace "vm.swappiness"
+                with    "vm.swappiness=60"
+        end
+
+Or with a regex:
+
+        replace_line_or_add "/etc/sysctl.conf" do
+                replace /.*vm.swappiness.*/
+                with    "vm.swappiness=60"
+        end
+
+
 append_line
 -----------
 

libraries/matchers.rb

@@ -14,4 +14,8 @@ def run_replace(resource_name)
   def run_replace_line(resource_name)
     ChefSpec::Matchers::ResourceMatcher.new(:replace_line, :run, resource_name)
   end
+
+  def run_replace_line_or_add(resource_name)
+    ChefSpec::Matchers::ResourceMatcher.new(:replace_line_or_add, :run, resource_name)
+  end
 end

resources/replace_line_or_add.rb

@@ -0,0 +1,59 @@
+resource_name 'replace_line_or_add'
+actions :run
+default_action :run
+
+property :name, :name_property => true, :kind_of => String, :required => true
+property :file, :kind_of => String
+property :path, :kind_of => String
+property :replace, :kind_of => [String, Regexp], :required => true
+property :with, :kind_of => String, :required => true
+
+action :run do
+
+	file_path = file || path || name
+
+	# Check if we got a regex or a string
+	if replace.is_a?(Regexp)
+		regex = replace
+	else
+		regex = Regexp.new(Regexp.escape(replace))
+	end
+
+	# Check if file matches the regex
+	if ::File.read(file_path) =~ regex
+		# Calculate file hash before changes
+		before = Digest::SHA256.file(file_path).hexdigest
+
+		# Do changes
+		file = Chef::Util::FileEdit.new(file_path)
+		file.search_file_replace_line(regex, with)
+		file.write_file
+
+		# Notify file changes
+		if Digest::SHA256.file(file_path).hexdigest != before
+			Chef::Log.info "- #{replace}"
+			Chef::Log.info "+ #{with}"
+			updated_by_last_action(true)
+		end
+
+	else
+		regex = /^#{Regexp.escape(with)}$/
+		# Calculate file hash before changes
+		before = Digest::SHA256.file(file_path).hexdigest
+
+		# Do changes
+		file = Chef::Util::FileEdit.new(file_path)
+		file.insert_line_if_no_match(regex, with)
+		file.write_file
+
+		# Notify file changes
+		if Digest::SHA256.file(file_path).hexdigest != before
+			Chef::Log.info "- #{replace}"
+			Chef::Log.info "+ #{with}"
+			updated_by_last_action(true)
+		end
+
+		# Remove backup file
+		::File.delete(file_path + ".old") if ::File.exist?(file_path + ".old")
+	end
+end