screenshots.js.coffee

page = require('webpage').create()

url = phantom.args[1]
output = phantom.args[2]

page.open(url, (status)->
  console.log "Status: #{status}"
  page.render "#{output}.png"
  console.log "Took screenshot #{output}.png"
  console.log 'Exiting...'
  phantom.exit()
)

screenshots.rake

namespace :scrape do
  desc "Take a screenshot of a url using Phantomjs"
  task :screenshots => :environment do
    f = File.join(Rails.root, 'app', 'assets', 'javascripts', 'screenshot.js.coffee').gsub(/ /, '\ ')
    
    articles = Article.order('zscore DESC').limit(3)
    articles.each_with_index do |article, i|
      `phantomjs #{f} #{article.url} screenshot-#{i}`
      sleep 4
    end
  end
end