todoit.rb

#!/usr/bin/env ruby

class TodoItem
  attr_reader :title
  attr_accessor :done

  def self.parse(todo_line)
    line = todo_line.chomp
    if line =~ /^x /
      TodoItem.new line[2, line.size], true
    else
      TodoItem.new line
    end
  end

  def initialize(title, done=false)
    @title = title
    @done = done
  end

  def to_print
    done_str = @done ? "(DONE) " : "" 
    "#{done_str}#{@title}"
  end

  def to_s
    done_str = @done ? "x " : "" 
    "#{done_str}#{@title}"
  end
end

class TodoItems
  def initialize()
    @items = []
  end

  def add(item)
    @items << item
  end

  def delete(idx)
    @items.delete_at(idx)
  end

  def cleanup
    @items.delete_if {|i| i.done}
  end

  def mark_as_done(idx)
    @items[idx].done = true
  end

  def output(writer)
    writer.write @items.join("\n")
  end

  def to_s
    return_val = []
    @items.each_with_index {|item, idx| return_val << "[#{idx}] #{item.to_print}"}
    return_val.join("\n")
    # @items.join("\n")
  end
end

def write_it(items)
  File.open "todo.txt", "w" do |f| 
    items.output(f)
  end
end

def read_it
  items = TodoItems.new
  File.open "todo.txt", "r" do |f|
    while line = f.gets do
      items.add TodoItem.parse line 
    end
  end
  items
end

items = read_it

case ARGV[0]
when "add"
  items.add TodoItem.parse ARGV[1, ARGV.size].join(" ")
when "del"
  items.delete ARGV[1].to_i
when "done"
  items.mark_as_done ARGV[1].to_i
when "clean"
  items.cleanup
end

puts items

write_it(items)