#!/usr/bin/env ruby
# remind.rb by Tom Morris
# I've been meaning to write this script for a while. The backstory is this:
# I travel on a train which has overhead storage shelves. I seem to always
# forget that I leave stuff up there if, by chance, I get into 'flow' while
# on my computer. I figured that having a little remind a few minutes before
# I got to London would be very useful.
# And so, remind.rb lets me do that.
# > remind +30m "Don't leave your bag on the shelf, you forgetful goofball."
# Will use the UNIX atq to store a growlnotify job.
#
# If you use Mac OS X, you'll need to turn the atq on by following the
# instructions at http://is.gd/RoJZ
# 
# Dependencies: Ruby, the 'chronic' gem, Growl and growlnotify, at/atq/atrun
# 
# Feel free to substitute the growlnotify command with anything else that
# will prod you out of your stupor. libnotify on Linux, maybe. say (but not on
# the train or you'll hopefully be kicked by your rightfully angry fellow
# commuters). Maybe some clever XMPP/Jabber or SMS or Twitter stuff for the
# cloudish types.

require "rubygems"
require "chronic"
def date_pre_parser (date_str)
  # not gsub! because ARGV freezes input strings.
  date_str = date_str.gsub(/\+?(\d{1,})[h|H]/i, "in \\1 hours")
  date_str = date_str.gsub(/\+?(\d{1,})[m|M]/i, "in \\1 minutes")
  return date_str
end
date_string = ARGV[0]
date = Chronic.parse date_pre_parser(date_string)
string = ARGV[1]
`echo "growlnotify -m \\"#{string}\\" > /dev/null 2>&1" | at -t #{date.strftime("%Y%m%d%H%M")} > /dev/null 2>&1`