logo.rb

#!/usr/bin/ruby

# Ascii logo for the forthcoming Dotunderscore

require 'erb'
require 'ostruct'
require 'term/ansicolor'

# Object core extensions from ActiveSupport
class Object #:nodoc:
  def try(method, *args, &block)
    send(method, *args, &block)
  end
  remove_method :try
  alias_method :try, :__send__
end
# NilClass core extensions from ActiveSupport
class NilClass #:nodoc:
  def try(*args)
    nil
  end
end
# String core extensions from ActiveSupport
class String #:nodoc:
  def strip_heredoc
    indent = scan(/^[ \t]*(?=\S)/).min.try(:size) || 0
    gsub(/^[ \t]{#{indent}}/, '')
  end
end

# Process logo
class Logo < ERB
  include Term::ANSIColor

  LOGO_FILE = 'logo'

  # rubocop:disable LineLength, MethodLength
  def self.template
    <<-'TEMPLATE'.strip_heredoc
        <%= @dot.front %>____<%= @none %>
       <%= @dot.front %>/\<%= @none %>  <%= @dot.back %>/<%= @dot.front %>\<%= @none %>
      <%= @dot.front %>/<%= @none %><%= @dot.back %>_<%= @none %> <%= @dot.front %>\___\<%= @none %>
      <%= @dot.front %>\<%= @none %>  <%= @dot.front %>/<%= @none %>   <%= @dot.front %>/<%= @none %>
       <%= @dot.front %>\/__<%= @none %><%= @dot.back %>\<%= @none %><%= @dot.front %>/<%= @none %>  <%= @underscore.front %>______________<%= @none %>
              <%= @underscore.front %>/\<%= @none %>            <%= @underscore.back %>/<%= @none %><%= @underscore.front %>\<%= @none %>
             <%= @underscore.front %>/<%= @none %><%= @underscore.back %>_<%= @none %> <%= @underscore.front %>\_____________\<%= @none %>
             <%= @underscore.front %>\<%= @none %>  <%= @underscore.front %>/<%= @none %>             <%= @underscore.front %>/<%= @none %>
              <%= @underscore.front %>\/____________<%= @none %><%= @underscore.back %>\<%= @none %><%= @underscore.front %>/<%= @none %>
    TEMPLATE
  end

  def self.default
    new(dot: :cyan, underscore: :yellow)
  end

  def self.plain
    new
  end

  def self.method_missing(meth, *args)
    colors = meth.to_s.split('_').map(&:to_sym)
    if colors.length == 2 && colors.all? { |c| method_defined? c }
      return new(dot: colors[0], underscore: colors[1])
    end
    super
  end

  attr_accessor :dot, :underscore, :none

  def initialize(*args)
    setup(*args)
    super(self.class.template)
  end

  def save(outfile = LOGO_FILE)
    content = result
    File.open(outfile, 'w') do |f|
      f.write content
    end
    content
  end

  def result
    super(binding)
  end

  def to_s
    result
  end

  private

  def setup(arg = {})
    [:dot, :underscore].each do |attr|
      front = back = main = arg[attr] ? send(arg[attr]) : ''
      unless main.empty?
        front += bold
        back  += dark
      end
      instance_variable_set :"@#{attr}",
                            OpenStruct.new(front: front, back: back)
    end
    @none = arg.empty? ? '' : reset
  end
end

if __FILE__ == $PROGRAM_NAME
  logo =
    if ARGV.empty?
      Logo.default
    else
      Logo.send ARGV[0].to_sym
    end
  puts logo
end