A Simple ToDo App Using Ruby and MongoDB

mongo_todo.rb

#!/usr/bin/env ruby
require 'rubygems'
require 'mongo'

class ToDo
  def initialize(args)
    @args  = args
    @mongo = Mongo::Connection.new.db("todo").collection("todos")
  end

  def run
    if @args.empty?
      show :complete => false
    else
      case @args.first
      when "help"   then help
      when "high"   then add "high"
      when "low"    then add "low"
      when "next"   then show :complete => false, :level => "high"
      when "done"   then show :complete => true
      when "dont"   then complete false
      when "finish" then complete true
      else
        help
      end
    end
  end

  def show(params)
    sort = [["level", Mongo::ASCENDING], ["added", Mongo::ASCENDING]]
    @mongo.find(params, :sort => sort).each { |todo| puts "#{todo["task"]} (#{todo["level"]})" }
  end

  def add(level)
    help unless @args.length == 2
    @mongo.insert "task" => @args.last, "level" => level, "complete" => false, "added" => Time.now
    puts "added #{level} level task: #{@args.last}"
  end

  def complete(finish)
    help unless @args.length == 2
    if (document = @mongo.find_one("task" => @args.last, "complete" => false))
      if finish
        document["complete"] = Time.now
        @mongo.save(document)
        puts "finished: #{@args.last}"
      else
        @mongo.remove(document)
        puts "removed: #{@args.last}"
      end
    else
      puts "No ToDo matching #{@args.length} found"
    end
  end

  def help
    abort <<-HELP
    usage: #{__FILE__} <method>

    == Methods ==

    <none>            list all incomplete tasks sorted by priority then chronologically
    help              show this help
    next              list all incomplete tasks that are high priority
    done              list all complete tasks chronologically
    high "argument"   add high priority task called argument
    low "argument"    add low priority task called argument
    finish "argument" complete task called argument
    dont "argument"   delete unfinished task called argument
    HELP
  end
end

ToDo.new(ARGV).run