Rakefile

# frozen_string_literal: true

task :console do
  exec "irb -r gwitch -I ./lib"
end

require "rake/testtask"

task default: :test

Rake::TestTask.new do |t|
  t.libs = %w[lib test]
  t.test_files = FileList["test/**/*_test.rb"]
  t.warning = true
  t.verbose = true
end

namespace :gwitch do
  GEM_VERSION_FILE = File.expand_path('../lib/gwitch/version.rb', __FILE__)
  GIT_TAG_URL      = 'https://github.com/dounx/gwitch/releases/tag/'

  def last_commit_date
    `git log -1 --date=short --format=%cd`.chomp
  end

  def latest_tag
    `git describe --tags --abbrev=0`.chomp
  end

  def changelog(git_start = latest_tag(), git_end = 'HEAD', format = '%s')
    `git log --no-decorate --no-merges --pretty=format:#{format} #{git_start}..#{git_end}`
  end

  desc 'Write latest changes to CHANGELOG.md'
  task :changelog, [:version] do |t, args|
    # Filters-out commits containing some keywords and adds header
    exceptions_regexp = Regexp.union(['README'])
    title = "## [%s](%s%s) (%s)\n\n" % [args[:version], GIT_TAG_URL, args[:version], last_commit_date]
    changes = changelog.each_line
                       .map { |line| (exceptions_regexp === line) ? nil : "* #{line.capitalize}" }
                       .unshift(title)
                       .append("\n\n")
                       .join

    puts changes
    puts "\n\e[31mDo you want to update the CHANGELOG.md with the text above? [y/N]\e[0m"
    exit if STDIN.gets.chomp.downcase != 'y'

    # Rewrite CHANGELOG.md
    old_changes = File.readlines('CHANGELOG.md', 'r').join
    File.open('CHANGELOG.md', 'w') { |file| file.write(changes, old_changes) }

    puts 'CHANGELOG.md successfully updated'
  end

  desc 'Bump gem version'
  task :semver, [:version] do |t, args|

    File.open(GEM_VERSION_FILE, 'w') do |file|
      file.write <<~SEMVER
        module Gwitch
          VERSION = "#{args[:version]}"
        end
      SEMVER
    end

    # This force to reload the file with the newest version.
    # Hence, `gemspec.version` invoked by Bundler later on will be correct.
    load GEM_VERSION_FILE

    puts "Bumped gem version from #{latest_tag} to #{args[:version]}"
  end

  desc 'Release a new version of this gem'
  task :release, [:version] => [:changelog, :semver] do |t, args|
    `git add #{File.expand_path('../lib/gwitch/version.rb', __FILE__)} CHANGELOG.md`
    `git commit -m "Bump to version #{args[:version]}"`
  end
end