Convert zsh_history to fish_history (in case that zsh_history is old format)

z2f_history.rb

# from  https://qiita.com/troter/items/f011f3bf5afa72749731

require 'stringio'
require 'date'

File.open(File.expand_path('~/.zsh_history')) do |f|
  escaped = StringIO.new

  # .zsh_historyのデコード
  f.to_enum(:each_byte).tap do |enum|
    processes = []
    loop do
      b = enum.next
      if b == 0x83
        b = enum.next
        b = (b ^ 0x20)
      end
      processes << b
    end
    escaped.write processes.pack('c*')
  end

  # 雑にパースしてfish_historyのyamlに変換
  # ヒアドキュメントなどを使った複数行入力については諦めて標準エラー出力に出す
  multi_line = ""
  escaped.rewind
  escaped.each_line do |l|
    # unless l[0] == ':'
    #   $stderr.puts l
    #   next
    # end
    # command = l.split(/;/, 2).last
    # time = l.split(/\:/, 3)[1]
    # if time.nil?
    #   $stderr.puts l
    #   next
    # end
    l.strip!
    if l.chars.last(2).join == "\\\\"
      multi_line = multi_line + " " + l[0, l.length-2]
    else
      cmd = l
      if multi_line != ""
        cmd = multi_line
        multi_line = ""
      end
      puts "- cmd: #{cmd}"
      puts "  when: #{Time.now.to_i}"
    end
  end
end