wunderout.rb

#!/usr/bin/env ruby

require 'json'
require 'date'

wunderlist = JSON.parse(File.read ARGV[0])
tasks, lists = wunderlist['data']["tasks"], wunderlist['data']["lists"]

tasks.map! do |task|
  due_date = task["due_date"]
  completed_at = Date.parse(task["completed_at"]).strftime if task["completed_at"]

  list = lists.detect { |l| l['id'] == task['list_id'] }
  project_title = (list ? list['title'] : 'inbox').split(' ').map(&:capitalize).join

  completed =  "x #{completed_at} " if completed_at
  title = task['title']
  project = "+#{project_title}"
  note = "- #{task['note'].gsub("\n", " ")}" if task['note']
  due = "due:#{due_date}" if due_date
  recurrence = "rec:#{task['recurrence_count']}#{task['recurrence_type'][0]}" if task['recurrence_type']

  [completed, title, note, project, due, recurrence].compact.join(' ').squeeze(' ')
end

puts tasks