# encoding: utf-8
# frozen_string_literal: true

require 'bundler/gem_tasks'
require 'rake/testtask'
require 'rake/clean'
require 'date'

task :default => [:test]

Rake::TestTask.new do |t|
  t.libs       = %w(test/ lib/)
  t.test_files = FileList["test/**/test_*.rb"]
  t.warning    = false
end

task :test_cov do
  ENV['COVERAGE'] = '1'
  Rake::Task['test'].invoke
end

task :build => [:generate_release, :changelog]

GENERATED_FILES = %w(lib/parser/lexer.rb
                     lib/parser/ruby18.rb
                     lib/parser/ruby19.rb
                     lib/parser/ruby20.rb
                     lib/parser/ruby21.rb
                     lib/parser/ruby22.rb
                     lib/parser/ruby23.rb
                     lib/parser/ruby24.rb
                     lib/parser/ruby25.rb
                     lib/parser/ruby26.rb
                     lib/parser/ruby27.rb
                     lib/parser/macruby.rb
                     lib/parser/rubymotion.rb)

CLEAN.include(GENERATED_FILES)

ENCODING_COMMENT = "# -*- encoding:utf-8; warn-indent:false; frozen_string_literal: true  -*-\n"

desc 'Generate the Ragel lexer and Racc parser.'
task :generate => GENERATED_FILES do
  Rake::Task[:ragel_check].invoke
  GENERATED_FILES.each do |filename|
    content = File.read(filename)
    content = ENCODING_COMMENT + content unless content.start_with?(ENCODING_COMMENT)

    File.open(filename, 'w') do |io|
      io.write content
    end
  end
end

task :regenerate => [:clean, :generate]

desc 'Generate the Ragel lexer and Racc parser in release mode.'
task :generate_release => [:clean_env, :regenerate]

task :clean_env do
  ENV.delete 'RACC_DEBUG'
end

task :ragel_check do
  require 'cliver'
  Cliver.assert('ragel', '~> 6.7')
end

desc 'Generate YARD documentation'
task :yard => :generate do
  sh('yard doc')
end

PAGES_REPO = 'git@github.com:whitequark/parser'

desc "Build and deploy documentation to GitHub pages"
task :pages do
  system "git clone #{PAGES_REPO} gh-temp/ -b gh-pages; rm gh-temp/* -rf; touch gh-temp/.nojekyll" or abort
  system "yardoc -o gh-temp/;" or abort
  system "cd gh-temp/; git add -A; git commit -m 'Updated pages.'; git push -f origin gh-pages" or abort
  FileUtils.rm_rf 'gh-temp'
end

desc 'Generate Changelog'
task :changelog do
  fs     = "\u{fffd}"
  format = "%d#{fs}%s#{fs}%an#{fs}%ai"

  # Format: version => { commit-class => changes }
  changelog = Hash.new do |hash, version|
    hash[version] = Hash.new do |hash, klass|
      hash[klass] = []
    end
  end

  branch = `git describe HEAD --all`.strip.gsub(/.+\/([^\/]+)$/, '\1')

  IO.popen("git log --pretty='#{format}' " \
           "remotes/origin/2.0 remotes/origin/2.1 remotes/origin/2.2 #{branch}", 'r') do |io|
    current_version = nil

    io.each_line do |line|
      version, message, author, date = line.
            match(/^(?: \((.*)\))?#{fs}(.*)#{fs}(.*)#{fs}(.*)$/o).captures
      date = Date.parse(date)

      current_version = "#{$1} (#{date})" if version =~ /(v[\d\w.]+)/
      current_version = "Not released (#{date})" \
        if version =~ /(^| |\/)#{Regexp.escape branch}$/ && !branch.start_with?('v')

      next if current_version.nil?
      changelog[current_version] # add a hash

      next if message !~ /^[+*-]/
      changelog[current_version][message[0]] << "#{message[1..-1]} (#{author})"
    end
  end

  commit_classes = {
    '*' => 'API modifications:',
    '+' => 'Features implemented:',
    '-' => 'Bugs fixed:',
  }

  File.open('CHANGELOG.md', 'w') do |io|
    io.puts 'Changelog'
    io.puts '========='
    io.puts

    changelog.each do |version, commits|
      next if commits.empty?
      io.puts version
      io.puts '-' * version.length
      io.puts

      commit_classes.each do |sigil, description|
        next unless commits[sigil].any?

        io.puts description
        commits[sigil].uniq.each do |commit|
          io.puts " * #{commit.gsub('<', '\<').lstrip}"
        end
        io.puts
      end
    end
  end

  sh('git commit CHANGELOG.md -m "Update changelog." || true')
end

rule '.rb' => '.rl' do |t|
  sh "ragel -F1 -R #{t.source} -o #{t.name}"
end

rule '.rb' => '.y' do |t|
  opts = [ "--superclass=Parser::Base",
           t.source,
           "-o", t.name
         ]
  opts << "--no-line-convert" unless ENV['RACC_DEBUG']
  opts << "--debug" if ENV['RACC_DEBUG']

  sh "racc", *opts
end

task :test => [:generate]