class Lookbook::WhitespaceStripper

def call
  source = @source.chomp
  last = source.split(/\r?\n/).last
  indent = last ? last[/^([ \t]*)/, 1].length : 0
  source.gsub(/^[ \t]{#{indent}}/, "").strip_heredoc.strip.html_safe
end

def initialize(source)
  @source = source.to_s
end