just a short, fast string templater.

sprintf.coffee

sprintf_re = /%\({1}([a-zA-Z0-9_]+)\){1}/

sprintf = (str, obj) ->
  ((if obj.hasOwnProperty(a) then obj[a] else a) for a in str.split sprintf_re).join("")

console.log(sprintf("%(quantity) @ %(weight)", {quantity: 13, weight: 42}))

sprintf.js

var sprintf, sprintf_re;

sprintf_re = /%\({1}([a-zA-Z0-9_]+)\){1}/;

sprintf = function(str, obj) {
  var a;
  return ((function() {
    var _i, _len, _ref, _results;
    _ref = str.split(sprintf_re);
    _results = [];
    for (_i = 0, _len = _ref.length; _i < _len; _i++) {
      a = _ref[_i];
      _results.push(obj.hasOwnProperty(a) ? obj[a] : a);
    }
    return _results;
  })()).join("");
};

console.log(sprintf("%(quantity) @ %(weight)", {
  quantity: 13,
  weight: 42
}));