cas.rb

require'open-uri'
require'nokogiri'

URL = 'http://%{city}.craigslist.org/search/%{section}?zoomToPosting=&query=%{query}&srchType=T&minAsk=&maxAsk='
Entry = Struct.new(:name, :link, :age, :location)

def get(opts={}) 
	opts = {
		query: 'w4m', city: 'stlouis',
		section: 'cas'
	}.merge opts
	open(URL%opts, &:read) 
end
def pars(opts={}) 
	Nokogiri::HTML(get(opts)).css('.srch.row').map { |r|
		link = r.css('.title1 a')[0]
		name = link.children.first.to_s
		link = link.attributes["href"].value

		age = r.css('.title2 .itempnr')[0].children
		loc = age[3].text rescue "None"
		age = age[1].text rescue "None"
		age = age.to_i if age.to_i != 0

		Entry.new(name, link, age, loc)
	}
end