Script for downloading webfont files from Google Web Fonts CSS and converting CSS to point to local copies

webfonts-to-local.rb

#!/usr/bin/env ruby

require 'pathname'

infile = ARGV[0]
fonts_dir = ARGV[1]

unless infile && fonts_dir
  puts "Usage: webfonts-to-local.rb <INPUT-CSS> <FONTS-DIR>"
  exit(1)
end

unless File.exists?(infile)
  puts "No such input file: #{infile}"
  exit(1)
end

unless File.directory?(fonts_dir)
  puts "No such fonts directory: #{fonts_dir}"
  exit(1)
end

workdir_path = Pathname.new(Dir.pwd)
fonts_dir = Pathname.new(File.expand_path(fonts_dir)).relative_path_from(workdir_path).to_s

original = File.read(infile)
entries = original.split(/(?<=}\n)/)

entries.each do |e|
  font_name = e.match(/local\('([^']+-[^']+)'\)/)[1]
  # weight = font_name.match(/-([^-]+)$/)[1]
  # next if weight.match(/(Light|Semi|Extra)/) # Filter out light, semibold, extrabold

  language = e.match(/\/\* ([^ ]+) \*\//)[1]
  language_qualifier = language.split('-').map(&:capitalize).join('-')

  url = e.match(/url\(([^)]+)\)/)[1]
  ext = url.match(/(\.[^.]+)$/)[1]

  qualified_name = "#{font_name}-#{language_qualifier}#{ext}"
  local_path = "#{fonts_dir}/#{qualified_name}"

  unless File.exists?(local_path)
    `curl #{url} -o #{local_path}`
  end

  new_css = e.sub(url, local_path)
  puts new_css
end