trim_indent

# File lib/xsd/codegen/gensupport.rb, line 137
  def trim_indent(str)
    indent = nil
    str = str.collect { |line| untab(line) }.join
    str.each do |line|
      head = line.index(/\S/)
      if !head.nil? and (indent.nil? or head < indent)
        indent = head
      end
    end
    return str unless indent
    str.collect { |line|
      line.sub(/^ {0,#{indent}}/, "")
    }.join
  end