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Ruby script that uses capybara-webkit and imagemagick (convert actually) to turn a dzslides HTML slideshow into a PDF.
#! /usr/bin/env ruby
# dzslides2pdf.rb
# dzslides2pdf.rb http://localhost/presentation_root presentation.html
require 'capybara/dsl'
require 'capybara-webkit'
# require 'capybara/poltergeist'
require 'fileutils'
include Capybara::DSL
base_url = ARGV[0] || exit
presentation_name = ARGV[1] || 'presentation.html'
# temporary file for screenshot
FileUtils.mkdir('./screenshots') unless File.exist?('./screenshots')
Capybara.configure do |config|
config.run_server = false
config.default_driver
config.current_driver = :webkit # :poltergeist
config.app = "fake app name"
config.app_host = base_url
end
visit '/presentation.html' # visit the first page
# change the size of the window
if Capybara.current_driver == :webkit
page.driver.resize_window(1024,768)
end
sleep 3 # Allow the page to render correctly
page.save_screenshot("./screenshots/screenshot_000.png", width: 1024, height: 768) # take screenshot of first page
# calculate the number of slides in the deck
slide_count = page.body.scan(%r{slide level1}).size
puts slide_count
(slide_count - 1).times do |time|
slide_number = time + 1
keypress_script = "Dz.forward();" # dzslides script for going to next slide
page.execute_script(keypress_script) # run the script to transition to next slide
sleep 3 # wait for the slide to fully transition
# screenshot_and_save_page # take a screenshot
page.save_screenshot("./screenshots/screenshot_#{slide_number.to_s.rjust(3,'0')}.png", width: 1024, height: 768)
print "#{slide_number}. "
end
puts `convert screenshots/*png presentation.pdf`
FileUtils.rm_r('screenshots')
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