A small todo program I wrote in a sitting. Incredibly simple.

todo.rb

#!/usr/bin/env ruby
# coding: utf-8

#this is a normal todo prog which saves your todos in a local file called .todo

#./todo --help
#todo.rb usage:
# todo.rb               list all active tasks
# todo.rb <task>        create a task described by <task>
# todo.rb -r <string>   deletes all tasks matching <string>
# todo.rb -vr <string>  show what tasks would be deleted with a given <string>


#there is 'aggressive' todo matching, multiple todo's can be wiped with a 
# single word. -vr flag will show you which todo's match the remove regex
# ./todo -vr todo program

#suggested .bash_profile alias: alias t='/dir/to/todo.rb'

todos = []
pwd = Dir.getwd
todo_file = pwd + '/.todo'

#create the .todo file
unless File.exists? todo_file
  if !File.new(todo_file, 'w')
    puts 'There was an issue creating the .todo file at #{pwd}'
  end
end

#read all of the todo's and store them in todos[]
File.open(todo_file, 'r') do |f|
  while line = f.gets do
    todos << line
  end
end

if ARGV.length >= 1
  remove = false
  verbose = false

  case ARGV[0]
  when '-r'
    remove = true
  when '-vr'
    remove = verbose = true
  when '--help'
    puts "todo.rb usage:"
    puts "  todo.rb\t\t list all active tasks"
    puts "  todo.rb <task>\t create a task described by <task>"
    puts "  todo.rb -r <string>\t deletes all tasks matching <string>"
    puts "  todo.rb -vr <string>\t show what tasks would be deleted with a given <string>"
    exit(0)
  end

  #we need to have more than just the flags in order to delete stuff
  if remove and ARGV.length > 1
    #lets get a list of all of the todo's that match the argv[1]
    todos_to_remove = todos.find_all{|todo| /#{ARGV[1..-1].join(' ')}/ =~todo }
    if verbose
      if not todos_to_remove.empty?
        puts "/#{ARGV[1..-1].join(' ')}/ would remove: "
        todos_to_remove.each do |todo|
          puts "  • #{todo}"
        end
      else
        puts "/#{ARGV[1..-1].join(' ')}/ doesn't match any tasks"
      end
    else
      todos_left = todos - todos_to_remove
      File.open(todo_file, 'w') do |file|
        todos_left.each do |todo|
          file.puts todo
        end
      end
    end
  elsif remove and ARGV.length == 1
    puts "you forgot a string for me to match\nex: todo.rb -r make stuff"
  else
    todos << ARGV[0..-1].join(' ') #get all the words
    File.open(todo_file, 'w') do |file|
      todos.each do |todo|
        file.puts "#{todo}"
      end
    end
  end
else
  #list the todo's
  puts (todos.empty? ? "ka-pow! nothing left! I'm proud of you" : "listing todos:")

  todos.each do |todo|
    puts "  • #{todo}"
  end
end