gistfile1.rb

module History
  module Shell
    def zsh_history_file
      @zsh_history_file ||= File.expand_path('~/.zsh_history')
    end

    def zsh_history
      @zsh_history ||= File.read(zsh_history_file)
    end

    def encoded_zsh_history
      @encoded_zsh_history ||= zsh_history.encode('UTF-8', 'ASCII-8BIT', undef: :replace, invalid: :replace, replace: '')
    end

    def history
      @history ||= encoded_zsh_history.split(/\n/).map(&:strip)
    end

    def command_lines
      @command_lines ||= history.map {|line| line.split(';').last.strip }
    end

    def command_history(pattern = nil)
      (pattern ? command_lines.grep(pattern) : command_lines).map {|command_line| command_line.split(/\s+/) }
    end
  end

  module Statistics
    def stats(population, keys)
      Hash[keys.map {|key| [key, population.count(key)] }]
    end
  end

  module Git
    include Shell
    include Statistics

    extend self

    def git_command_history
      @git_command_history ||= command_history(/^git\s/)
    end

    def git_subcommands
      @git_subcommands ||= git_command_history.map {|command| command.find {|element| element != 'git' && /^\w/ === element } }.compact
    end

    def git_subcommands_stats
      stats(git_subcommands, git_subcommands.uniq)
    end

    def git_aliases
      @git_aliases ||= `git config --global --list | grep '^alias[.]' | cut -d. -f2 | cut -d= -f1`.split(/\n/)
    end

    def git_aliases_stats
      stats(git_subcommands, git_aliases)
    end
  end
end