Gist for "What I Wish a Ruby Programmer Had Told Me One Year Ago".

tdo.rb

class TodoList
	def self.load(file)
		# read the file, create a list, create items, add them to the list, return the list
		list = TodoList.new
		File.read(file).each_line do |line|
			list.add TodoItem.new(line.rstrip)
		end

		list
	end

	def initialize
		@list = []
	end

	def add(item)
		@list << item
	end

	def write(file)
		# write the file, only write the undone items
		File.open(file, 'w') do |f|
			f.write(@list.reject {|item| item.done?}.join("\n"))
		end
	end

	def [](id)
		@list[id]
	end
end

class TodoItem
	# provide reader and setter for name and state
	attr_accessor :name, :done
	alias_method :done?, :done

	def initialize(name)
		# store name
		# set state to undone
		@name = name
		@done = false
	end
end

# ---
# the library will be used like this:
# list = TodoList.load("todo.td")
# list[0].done = true
# list.add TodoItem.new("another cool item")
# list.write("todo.td")
#

list = TodoList.load("todo.td")
list[0].done = true

list.add TodoItem.new("Grow long hair for pro multitasking capabilities")
list.write("todo.td")