Shell command escape by CoffeeScript

shell-command-escape.coffee

# replacement of node-shell-quote
# quote ['echo', '"Oh"', '>_<;']  # ==> echo '"Oh"' \>_\<\;
quote = (xs)->
  (for s in xs
    if /["\s]/.test(s) and !/'/.test(s)
      "'" + s.replace(/(['\\])/g, '\\$1') + "'"
    else if /["'\s]/.test(s)
      '"' + s.replace(/(["\\$`(){}!#&*|])/g, '\\$1') + '"'
    else
      String(s).replace(/([\\$`(){}!#&*|<>;])/g, '\\$1')
  ).join ' '