# File lib/escape.rb, line 65
65:   def shell_single_word(str)
66:     if str.empty?
67:       "''"
68:     elsif %r{\A[0-9A-Za-z+,./:=@_-]+\z} =~ str
69:       str
70:     else
71:       result = ''
72:       str.scan(/('+)|[^']+/) {
73:         if $1
74:           result << %q{\'} * $1.length
75:         else
76:           result << "'#{$&}'"
77:         end
78:       }
79:       result
80:     end
81:   end