ago.js fixes

app/assets/javascripts/ago.js

@@ -1,27 +1,36 @@
 function Ago(nodes, options) {
+  if (!(nodes instanceof Array)) {
+    options = nodes;
+    nodes = undefined;
+  }
   nodes = nodes || document.querySelectorAll("time");
   options = options || {};
 
 
   var default_opts = {
     interval: 10000, // 10 secs
-    units: {
-      minute:     60,
-      hour:     3600,
-      day:     86400,
-      week:   604800,
-      month: 2592000,
-      year: 31536000
-    },
+    units: [
+      ["minute",     60],
+      ["hour",     3600],
+      ["day",     86400],
+      ["week",   604800],
+      ["month", 2592000],
+      ["year", 31536000]
+    ],
     date: function(node) {
-      // works on  HTML 'time' nodes
+      // works on  HTML "time" nodes
       return new Date(node.dateTime);
     },
-    format: "{v} {u} {r}",
-    words: {
-      now: "just now",
-      ago: "ago",
-      ahead: "ahead"
+    format: function(time, unit) {
+      if (!unit) {
+        return "just now";
+      }
+      if (time < 0) {
+        var tail = " ahead";
+      } else {
+        var tail = " ago";
+      }
+      return Math.abs(time) + " " + unit + tail;
     },
     plural: {
       minute: "minutes",
@@ -43,37 +52,30 @@ function Ago(nodes, options) {
     // use callback to get date
     var ago_date = options.date(node);
     // get seconds ago
-    ago_time = (new Date().getTime() - ago_date.getTime()) / 1000;
-    ago_time = Math.floor(Math.abs(ago_time));
+    var ago_time = (new Date().getTime() - ago_date.getTime()) / 1000;
+    var abs_time = Math.floor(Math.abs(ago_time));
 
     // find greatest unit
     var unit = null;
     var unit_time = null;
     for (var u in options.units) {
-      var secs = options.units[u];
-      if (ago_time >= secs) {
-        unit = u;
+      var secs = options.units[u][1];
+      if (abs_time >= secs) {
+        unit = options.units[u][0];
         unit_time = secs;
+      } else {
+        break;
       }
     }
 
-    var output = null;
     if (unit_time !== null) {
-      ago_time = Math.floor(ago_time/unit_time);
+      abs_time = Math.floor(abs_time/unit_time);
       // plural
-      if (ago_time != 1) unit = options.plural[unit];
-      // future or past?
-      relative = (ago_time < 0 ? options.words.ahead : options.words.ago);
-
-      output = options.format
-        .replace("{v}", ago_time)
-        .replace("{u}", unit)
-        .replace("{r}", relative);
-    } else {
-      output = options.words.now;
+      if (abs_time != 1) {
+        unit = options.plural[unit];
+      }
     }
-
-    node.textContent = output;
+    node.textContent = options.format(ago_time < 0 ? -abs_time : abs_time, unit);
   };