#!/usr/bin/env ruby

# A quick script to watch a list of RSS feeds and report new entries
# to Growl, which is chained to Prowl and my home network. Never miss
# a notification again!

# require 'prowl'
require 'net/http'
require 'simple-rss'
require 'ruby-growl'

GUID_FILE = "#{Dir.home}/.watch-rss"
FEEDS_URL = "https://dl.dropboxusercontent.com/u/2908279/public/feeds"

def open_url(uri)
    Net::HTTP.get(URI(uri))
end

begin

    guids = File.exists?(GUID_FILE) ? File.open(GUID_FILE).read.split("\n") : []
    feeds = open_url(FEEDS_URL).split("\n")

    g = Growl.new("localhost", "RSS Watcher")
    g.add_notification("RSS Watcher")

    feeds.each do |feed|
        url,terms = feed.split("|")

        feed = SimpleRSS.parse(open_url(url))
        feed.items.each do |item|

            guid = item.id || item.link
            if not terms.nil? and not item.title.index(terms)
                p "Skipped: #{item.title}"
                next
            end

            unless guids.include? guid
                g.notify("RSS Watcher", "New RSS entry!", "#{item.title}")

                guids << guid

                p "Found: #{item.title}"
            else
                p "Ignored: #{item.title}"
            end

        end

    end

    File.open(GUID_FILE, 'w').write(guids.join("\n"))
rescue Exception => e
    STDERR.puts e.message
    # STDERR.puts e.backtrace.inspect.join("\n")
end