fold

# File lib/yaml/baseemitter.rb, line 134
                def fold( value )
            value.gsub( /(^[ \t]+.*$)|(\S.{0,#{options(:BestWidth) - 1}})(?:[ \t]+|(\n+(?=[ \t]|\Z))|$)/ ) do |s| 
                $1 || $2 + ( $3 || "\n" )
            end
                end