class String

# File lib/marginalise.rb, line 2
def marginalise(m)
        lines = [""]
        self.split(' ').each do |word|
                if (lines.last.size + word.size + 1) < m
                        if lines.last == ""
                                lines[lines.size-1] = word
                        else
                                lines[lines.size-1] = lines.last+" "+word
                        end
                else
                        lines << word
                end
        end
        return lines.join "\n"
end