choosealicense.com/script/vendor-license-text

#!/usr/bin/env ruby
# frozen_string_literal: true

require 'jekyll'
require 'tmpdir'

tmp_dir = Dir.mktmpdir
git_cmd = "git clone --depth=1 'https://github.com/spdx/license-list-data.git' #{tmp_dir}"
system(git_cmd)
text_dir = File.join(tmp_dir, 'text')

site_path = File.expand_path('../', File.dirname(__FILE__))
config = Jekyll.configuration('source' => site_path)
site = Jekyll::Site.new(config)
site.read
site.collections['licenses'].docs.each do |license|
  license_key = license.data['spdx-id'].downcase
  puts "Updating the #{license_key}..."
  only = (license_key.include? 'gpl') ? '-only' : ''
  text_file = File.join(text_dir, "#{license.data['spdx-id']}#{only}.txt")
  spdx_text = File.read(text_file)

  if ['bsd-2-clause', 'bsd-3-clause'].include? license_key
    spdx_text = spdx_text.gsub(/<year>/, '[year]')
    spdx_text = spdx_text.gsub(/<owner>/, '[fullname]')
  elsif license_key == 'bsd-3-clause-clear'
    spdx_text = spdx_text.gsub(/\[xxxx\]-\[xxxx\]/, '[year]')
    spdx_text = spdx_text.sub(/\[Owner Organization\]/, '[fullname]')
    spdx_text = spdx_text.sub(/\[Owner Organization\]/, 'the copyright holder')
  elsif license_key == 'isc'
    spdx_text = spdx_text.gsub(/Copyright.*Consortium/m, 'Copyright (c) [year], [fullname]')
  elsif license_key == 'mit'
    spdx_text = spdx_text.gsub(/<year>/, '[year]')
    spdx_text = spdx_text.gsub(/<copyright holders>/, '[fullname]')
  elsif license_key == 'ncsa'
    spdx_text = spdx_text.gsub(/<Year>/, '[year]')
    spdx_text = spdx_text.gsub(/<Owner Organization Name>/, '[fullname]')
    spdx_text = spdx_text.gsub(/<Name of Development Group>/, '[fullname]')
    spdx_text = spdx_text.gsub(/<Name of Institution>/, '[project]')
    spdx_text = spdx_text.gsub(%r{<URL for Development Group/Institution>}, '[project_url]')
    spdx_text = spdx_text.gsub(/<Name of Development Group, Name of Institution>/, '[fullname], [project]')
  end

  license_text = ''

  spdx_text.lines.each do |line|
    if line.length > 78
      indented_line = line.match(/\A(\s*)(.*)/)
      line_indent = indented_line[1]
      line_text = indented_line[2] .gsub(/\s+/, ' ')
      text_width = 78 - line_indent.length
      line = line_text.gsub(/(.{1,#{text_width}})(\s+|\Z)/, "#{line_indent}\\1\n")
    end
    license_text += line
  end
  raw_content = File.read(license.path)
  matches = raw_content.match Jekyll::Document::YAML_FRONT_MATTER_REGEXP

  output = matches[1]
  output << "---\n\n"
  output << license_text.gsub(/\s+$/m, "\n")

  File.write(license.path, output)
end