A script that finds tasks in Things 3 that were completed today and formats them as a Markdown list for Day One

completed_things3_tasks_to_dayone.rb

#!/usr/bin/env ruby
# -*- coding: utf-8 -*- #specify UTF-8 (unicode) characters

require 'time'

tasktext = %x{ osascript <<APPLESCRIPT
set theDate to date string of ((current date))
tell application "Things3"
	set output to ""
	repeat with toDo in (to dos whose status is completed) of list "Logbook"
		set toDoName to name of toDo
		set toDoDate to completion date of toDo
		set toDoTime to time string of toDoDate
		set toDoDone to date string of toDoDate
		if toDoDone is equal to theDate then
			if project of toDo is missing value then
				set toDoTag to name of area of toDo
			else
				set toDoTag to name of project of toDo
			end if
			set output to output & toDoDate & " @ " & toDoName & " @" & toDoTag & linefeed
		end if
	end repeat
	return output
end tell
APPLESCRIPT}

taskarray = []
tagtext = "Tasks Completed on " + Time.now.strftime("%B %d") + "\n\n"
tasktext.strip.each_line do |line|
	donetime, task, category = line.split(/\@/)
	donetime = Time.parse(donetime).strftime("%l:%M%P")
	inject = { :name => task.strip, :time => donetime.strip, :category => category.strip }
	taskarray.push(inject)
end

taskarray = taskarray.sort_by {|h| [h[:category],h[:time]]}
uniq_tags = taskarray.map { |e| e[:category] }.uniq
uniq_tags.each do |tagger|
	tagtext += "\n### #{tagger}\n"
	taskarray.each do |unit|
		if unit.has_value?(tagger)
			tagtext += "- " + unit[:time] + " - " + unit[:name] + "\n"
		end
	end
end

`dayone2 new "#{tagtext}"`