chaman.rb

#!/usr/bin/env ruby

require 'git'
require 'logger'
require 'optparse'
require 'semantic'
require 'semantic/core_ext'
require 'tempfile'
require 'tty-prompt'

DEFAULT_AUTHOR_NAME = 'Evgeny Safronov'.freeze
DEFAULT_AUTHOR_MAIL = 'division494@gmail.com'.freeze
WORKING_DIR = '/Users/esafronov/code/core'.freeze

LOG = Logger.new(STDOUT)

TYPES = {
  feat: 'Added',
  change: 'Changed',
  fix: 'Fixed',
  perf: 'Performance'
}.freeze


# ChangelogManager.
class ChangelogManager
  def initialize(working_dir)
    @working_dir = working_dir
    @git = Git.open(working_dir)
    @versions = []
    @list_symbol = '*'
  end

  # Find the last version in git tags.
  # The format must adhere semantic versioning.
  def last_version
    read_git_version_tags if @versions.empty?

    @versions.last
  end

  def read_git_version_tags
    tags = @git.tags.map do |v|
      LOG.debug "Found version tag #{v.name}"

      matches = /^v(?<version>\d+.\d+.\d+)$/.match(v.name)
      matches[:version] unless matches.nil?
    end

    @versions = tags.compact.sort_by do |v|
      Semantic::Version.new(v)
    end
  end

  def last_version_tag
    "v#{last_version}"
  end

  def changelog_path
    File.join(@working_dir, 'debian/changelog')
  end

  def makefile_path
    File.join(@working_dir, 'Makefile')
  end

  def appveyor_path
    File.join(@working_dir, 'appveyor.yml')
  end

  def read_changelog
    File.read(changelog_path)
  end

  def read_makefile
    File.read(makefile_path)
  end

  def read_appveyor
    File.read(appveyor_path)
  end

  def parse_debian_changelog
    rx = /^(?<name>.*) \((?<version>.*)\) (?<distrib>.*); urgency=(?<urgency>.*)$/
    rx.match(read_changelog.lines.first)
  end

  def last_debian_version
    meta = parse_debian_changelog
    meta[:version]
  end

  def makefile_version
    rx = /VERSION = v(?<version>\d+\.\d+\.\d+)/
    meta = rx.match(read_makefile)
    meta[:version]
  end

  def update_makefile_version(version)
    rx = /VERSION = v(?<version>\d+\.\d+\.\d+)/
    content = read_makefile
    content.gsub! rx, "VERSION = v#{version}"
    File.write makefile_path, content
  end

  def update_appveyor_version(version)
    rx = /version: (?<version>\d+\.\d+\.\d+)\.{build}/
    content = read_appveyor
    content.gsub! rx, "version: #{version}.{build}"
    File.write appveyor_path, content
  end

  def do_all_stuff
    changelog = {}
    version = last_version_tag

    # Fetching all commits between the last version and HEAD.
    @git.log(1024).between(version, 'HEAD').each do |v|
      lines = v.message.lines

      brief = lines.first.strip

      matches = /^(?<type>.+):(?<message>.*)$/.match brief
      if matches.nil?
        LOG.warn"malformed brief: #{brief}"
        next
      end
      type = TYPES[matches[:type].to_sym]

      next if type.nil?

      # Remove type tag.
      lines[0] = matches[:message]

      changelog[type] = [] if changelog[type].nil?
      changelog[type].push(lines)
    end

    lines = []
    TYPES.values.each do |type|
      next if changelog[type].nil?

      changelog[type].each do |entry|
        brief = entry.first.strip
        detailed = entry[1..-1]
        lines.push("#{@list_symbol} #{type}: #{brief}.")

        found_exclude = false
        found_internals = false
        detailed.each do |v|
          v = v.strip.gsub('\\n', '')
          next if v.size.zero?

          found_internals = true if v.include? 'Internals:'
          next if found_internals

          found_exclude = true if v.include? 'Changelog: exclude'
          next if found_exclude

          reformat_wrapped(v).each do |s|
            lines.push("  #{s}")
          end
        end

        # End line with dot if missed.
        lines[-1] << '.' unless lines[-1].end_with? '.'
      end
    end

    lines = lines.map do |line|
      '  ' + line
    end
    result = lines.join("\n")
    result.tr!('`', '"')
    result
  end

  def reformat_wrapped(text, width = 78)
    lines = []
    line = ''
    text.split(/\s+/).each do |word|
      if line.size + word.size >= width
        lines << line
        line = word
      elsif line.empty?
        line = word
      else
        line << ' ' << word
      end
    end
    lines << line if line
    lines
  end
end

def main
  options = {}
  OptionParser.new do |opts|
    opts.banner = 'Usage: chaman.rb [options]'

    opts.on('-v', '--[no-]verbose', 'Run verbosely') do |v|
      options[:verbose] = v
    end

    opts.on('-s', '--simulate', 'Perform no action') do |v|
      options[:simulate] = v
    end

    opts.on_tail('-h', '--help', 'Show this message and exit') do
      puts opts
      exit
    end

    opts.on_tail('--version', 'Show version and exit') do
      puts VERSION.join('.')
      exit
    end
  end.parse!

  LOG.info"Working directory `#{WORKING_DIR}`"

  manager = ChangelogManager.new WORKING_DIR
  LOG.info "Last known version in git: #{manager.last_version}"
  LOG.info "Last known version in debian: #{manager.last_debian_version}"
  LOG.info "Last known version in Makefile: #{manager.makefile_version}"

  prompt = TTY::Prompt.new
  version = Semantic::Version.new manager.last_version
  version = prompt.select('What version to bump?') do |menu|
    menu.choice version.increment!(:major).to_s
    menu.choice version.increment!(:minor).to_s
    menu.choice version.increment!(:patch).to_s
  end

  puts version
  content = manager.do_all_stuff

  deb_full_name = ENV['DEBFULLNAME'] || DEFAULT_AUTHOR_NAME
  deb_email = ENV['DEBEMAIL'] || DEFAULT_AUTHOR_MAIL
  time = Time.new
  deb_formatted_date = time.strftime('%a, %d %b %Y %H:%M:%S %z')

  changelog = manager.read_changelog

  unless options[:simulate]
    file = Tempfile.new('changelog')
    meta = manager.parse_debian_changelog
    file.write "#{meta[:name]} (#{version}) #{meta[:distrib]}; urgency=#{meta[:urgency]}"
    file.write "\n\n"
    file.write content
    file.write "\n\n"
    file.write " -- #{deb_full_name} <#{deb_email}>  #{deb_formatted_date}"
    file.write "\n\n"
    file.write changelog
    file.close

    FileUtils.copy_file file.path, manager.changelog_path

    manager.update_makefile_version version
    manager.update_appveyor_version version
  end

  LOG.info 'Done'
end

main