generate.rb

#!/usr/bin/env ruby
require 'yaml'
require 'erb'
require 'set'

projects = YAML.load_file("projects.yml").values.sort_by { |p| p['name'].downcase }

@categories = Hash.new { |h, k| h[k] = [] }

projects.each do |project|
  project['categories'].each do |category|
    @categories[category.strip] << project
  end
end

template = ERB.new(File.read("index.html.erb"))

File.open("index.html", "w") do |f|
  f.write(template.result)
end

print "Written #{projects.size} projects in #{@categories.keys.size} categories to index.\n"