#!/usr/bin/env ruby
# encoding: utf-8

require 'fileutils'
require 'octokit'

def run(*args)
  puts "I will execute the following:"
  puts '    ' + args.map { |a| a =~ /\s/ ? a.inspect : a }.join(' ')
  print "Is this correct? [y/N] "
  res = gets
  unless res.strip.downcase == 'y'
    $stderr.puts "Answer was not Y; release aborted."
    exit 1
  end

  system('echo', *args)
  system(*args)
end



puts "=== Logging in to GitHub’s API…"
client = Octokit::Client.new(netrc: true)
puts

puts "=== Deleting old *.gem files…"
Dir['*.gem'].each do |fn|
  puts "  #{fn}…"
  FileUtils.rm_f(fn)
end
puts

puts "=== Building new gem…"
run('gem', 'build', 'nanoc.gemspec')
puts

puts "=== Reading version…"
require_relative 'lib/nanoc/version'
puts "Version = #{Nanoc::VERSION}"
puts

puts "=== Verifying that release does not yet exist…"
releases = client.releases('nanoc/nanoc')
release = releases.find { |r| r.tag_name == Nanoc::VERSION }
if release
  $stderr.puts "Release already exists!"
  $stderr.puts "ABORTED!"
  exit 1
end
puts

puts "=== Creating Git tag…"
run('git', 'tag', '--sign', '--annotate', Nanoc::VERSION, '--message', "Version #{Nanoc::VERSION}")
puts

puts "=== Pushing Git data…"
run('git', 'push', 'origin')
run('git', 'push', 'origin', '--tags')
puts

puts "=== Pushing gem…"
run('gem', 'push', "nanoc-#{Nanoc::VERSION}.gem")
puts

puts "=== Reading release notes…"
release_notes = File.readlines('NEWS.md')
  .drop(4)
  .take_while { |l| l !~ /^## / }
  .join
puts

puts "=== Creating release on GitHub…"
sleep 3 # Give GitHub some time to detect the new tag
is_prerelease = !Nanoc::VERSION =~ /a|b|rc/ || Nanoc::VERSION =~ /^0/
client.create_release(
  'nanoc/nanoc', Nanoc::VERSION,
  prerelease: !!is_prerelease,
  body: release_notes,
)
puts

puts "DONE!"