rearranges

#!/usr/bin/env ruby

# Run this script to see if any variables need to be rearranged

body = if ARGV[0]
  File.read(ARGV[0])
else
  Dir['vendor/assets/stylesheets/bootswatch/*/_variables.scss'].each do |path|
    puts "#{path.split('/')[-2]}:"
    puts `./#{__FILE__} #{path}`
    puts "\n"
  end
  exit(0)
end


class Variable
  class << self
    attr_accessor :sections
  end

  def self.from_token(token, section_index)
    if token.strip =~ /\:$/
      new token.strip.chop.strip, section_index: section_index,
        assignment: true
    else
      new token.strip, section_index: section_index
    end
  end

  def initialize(name, options = {})
    @name = name
    @assignment = true if options[:assignment]
    @section_index = options[:section_index]
  end

  attr_reader :section_index

  def assignment?
    @assignment
  end

  def section
    self.class.sections[@section_index]
  end

  def section_header
    self.class.sections[@section_index - 1]
  end

  def section_name
    section_header.split("\n").first.sub('//== ', '')
  end

  def to_s
    @name
  end

  def ==(other)
    to_s == other.to_s
  end
end

Variable.sections = body.split(/(\/\/==\s+\w+[\/\s]+##[\W\w]$)/m)

tokens = []
in_section = false

Variable.sections.each.with_index do |section, index|
  if in_section
    tokens[index] = section.scan(/\$[\w-]+\s*\:?/)
    in_section = false
  elsif section =~ /(\/\/==\s+\w+[\/\s]+##[\W\w]$)/m
    tokens[index] = []
    in_section = true
  else
    tokens[index] = []
  end
end

unassigned = []
assigned = []

tokens.each.with_index do |group, index|
  group.each do |token|
    variable = Variable.from_token(token, index)

    if !variable.assignment? && !assigned.include?(variable)
      unassigned << variable
    end

    if variable.assignment?
      assigned << variable
    end
  end
end

moves = []
unassigned.each do |variable|
  assignment = assigned.find{|v| v == variable}
  if assignment
    moves << [
      [ variable.section_name,
        variable.section_header,
        variable.section,
        variable ],
      [ assignment.section_name,
        assignment.section_header,
        assignment.section,
        assignment ]
    ]
  end
end

moves.uniq!

moves.each do |move|
  src_sec_name = move.first.first
  dst_sec_name = move.last.first

  src_var = move.first.last
  dst_var = move.last.last

  if src_sec_name == dst_sec_name
    puts "  Swap lines under #{src_sec_name} section due to #{src_var}"
  else
    puts "  Move #{src_sec_name} section under #{dst_sec_name} due to #{src_var}"
  end
end

if moves.empty?
  puts "  All good!"
end