git ssb

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//call fn only every interval, call immediately if it hasn't
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//been called within interval, and if it's called again within
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//
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module.exports = function (fn, interval) {
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  var _ts = 0, timer
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  function go () {
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    clearTimeout(timer);
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    timeout = null;
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    _ts = Date.now();
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    fn()
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  }
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  return function () {
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    var diff = Date.now() - _ts
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    if(diff > interval) go()
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    else if(!timer) {
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      timer = setTimeout(go, interval - diff)
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    }
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  }
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}
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