release

#!/usr/bin/env ruby

require 'pathname'
require 'date'

MAIN_FILE = 'blueutil.m'
DEFINE_VERSION_REGEXP = /(?<=#define VERSION ")\d+(?:\.\d+)+(?=")/

version_parts = File.read(MAIN_FILE)[DEFINE_VERSION_REGEXP].split('.').map(&:to_i)

new_version = case ARGV
when %w[major]
  "#{version_parts[0] + 1}.0.0"
when %w[minor]
  "#{version_parts[0]}.#{version_parts[1] + 1}.0"
when %w[patch]
  "#{version_parts[0]}.#{version_parts[1]}.#{version_parts[2] + 1}"
else
  abort 'Expected major, minor or patch as the only argument'
end

def clean_workind_directory?
  `git status --porcelain`.empty?
end

clean_workind_directory? or abort('Working directory not clean')

system './update_usage'

clean_workind_directory? or abort('Usage in README is not up to date')

paths = Pathname.glob('*').select do |path|
  next unless path.file?
  next if path.executable?

  original = path.read
  changed = original.gsub(/(?<before>Copyright \(c\) )(?<year>\d+)(?:-\d+)?(?<after> \w+ \w+)/) do
    m = Regexp.last_match
    "#{m[:before]}#{[m[:year].to_i, Time.now.year].uniq.join('-')}#{m[:after]}"
  end

  case path.to_s
  when MAIN_FILE
    changed = changed.sub(DEFINE_VERSION_REGEXP, new_version)
  when 'CHANGELOG.md'
    lines = changed.lines
    {
      2 => "## unreleased\n",
      3 => "\n",
    }.each do |n, expected|
      abort "Expected #{expected} on line #{n}, got #{lines[n]}" unless lines[n] == expected
    end
    lines.insert(3, "\n", "## v#{new_version} (#{Date.today.strftime('%Y-%m-%d')})\n")
    changed = lines.join
  end

  next if original == changed

  path.open('w'){ |f| f.write(changed) }
end

Pathname('blueutil').unlink
system(*%w[make blueutil]) or abort('failed to build')
`./blueutil -h`[new_version] or abort('did not find new version in help output')
system *%w[git add] + paths.map(&:to_s)
system *%w[git diff --cached]

puts %q{Type "yes" to continue}
abort unless $stdin.gets.strip == 'yes'

system *%W[git commit -m v#{new_version}]
system *%W[git tag v#{new_version}]
system *%w[git push]
system *%w[git push --tags]