Class: WMATA_Alerts

Inherits:
Object
  • Object
show all
Defined in:
lib/WMATA_Alerts/wmata_alerts.rb

Constant Summary collapse

REPLACEMENTS = 
[
  ["p.m.", "pm"], 
  ["a.m.", "am"]
]
FEED_URL = 
"http://www.wmata.com/rider_tools/metro_service_status/feeds/rail.xml"

Instance Method Summary collapse

Instance Method Details

#die ⇒ Object 



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# File 'lib/WMATA_Alerts/wmata_alerts.rb', line 18

def die
  puts <<-EOS
metro-feed

  USAGE:

  \tmetro-feed [history] [wrapping-width]

  Returns WMATA feed information for metro lines.

  [history] is how many days of feed history to display.
  \tdefaults to 7 days. Can be anything parseable by Chronic gem

  [wrapping-width] is the limit to how wide the text can be
  \tdefaults to 40 characters. should be a positive integer value.

  Requires gems: chronic, htmlentities


EOS

  exit
end

#run(params) ⇒ Object 



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# File 'lib/WMATA_Alerts/wmata_alerts.rb', line 42

def run(params)

  die if params[0] == "-h"

  @cutoff_string = params[0] || "7 days ago"
  @width = params[1] || "40"
  @width = @width.to_s.to_i

  @cutoff = Chronic.parse(@cutoff_string)

  @rss_content = ""

  open(FEED_URL) do |f|
    @rss_content = f.read
  end

  @rss = RSS::Parser.parse(@rss_content, false)

  @item_hash = {}

  # filter down to the items we want.
  @rss.items.each do |item|
    @item_hash[item.pubDate] = item unless item.pubDate < @cutoff
  end

  if @item_hash.empty?
    puts "No data from WMATA feed."
  else
    @coder = HTMLEntities.new
    @item_hash.keys.sort.reverse.each do |key|
      item = @item_hash[key]

      title = "#{item.pubDate.strftime('%x')} - #{item.title}"
      puts title
      puts ("-" * title.length)

      message = @coder.decode(item.description)
      REPLACEMENTS.each do |r|
        message = message.gsub(r[0], r[1])
      end
      subject, *body = message.split(".")
      
      puts Utility.wrap_text(subject+"...", @width)
      body.each do |sentence|
        puts Utility.wrap_text(sentence+".", @width, 3, :all)
      end  

      puts
    end
  end

end