Composing programs to PDF

html_cleanup.rb

require 'nokogiri'

input = $stdin.readlines.join
page = Nokogiri::HTML(input)

page.css('.example').each do |elem|
  elem.inner_html = '<i>Environment diagram omitted.</i>'
end

page.css('img').remove

puts page.css('.inner-content').inner_html

mk_book.sh

set -e

pages="11-getting-started
12-elements-of-programming
13-defining-new-functions
14-designing-functions
15-control
16-higher-order-functions
17-recursive-functions"

function html_to_pdf {
  pandoc -f html -o "$1" --latex-engine=xelatex
}

while read -r page; do
  url="http://composingprograms.com/pages/$page.html"
  curl -s $url | ruby html_cleanup.rb | html_to_pdf "output/$page.pdf"

  echo "Done with $page"
done <<< "$pages"