relativedate: New javascript-alicious plugin that makes all dates display relative...

[ikiwiki.git] / underlays / javascript / relativedate.js

diff --git a/underlays/javascript/relativedate.js b/underlays/javascript/relativedate.js
new file mode 100644 (file)
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+++ b/underlays/javascript/relativedate.js
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+// Causes html elements in the 'date' and 'pagedate' classes to be displayed
+// as relative dates. The date is parsed from the title attribute, or from
+// the element content.
+
+var dateElements;
+
+hook("onload", getDates);
+
+function getDates() {
+       dateElements = getElementsByClass('date');
+       for (var i = 0; i < dateElements.length; i++) {
+               var elt = dateElements[i];
+               var title = elt.attributes.title;
+               var d = new Date(title ? title.value : elt.innerHTML);
+               if (! isNaN(d)) {
+                       dateElements[i].date=d;
+                       elt.title=elt.innerHTML;
+               }
+       }
+
+       showDates();
+}
+
+function showDates() {
+       for (var i = 0; i < dateElements.length; i++) {
+               var elt = dateElements[i];
+               var d = elt.date;
+               if (! isNaN(d)) {
+                       elt.innerHTML=relativeDate(d);
+               }
+       }
+       setTimeout(showDates,30000); // keep updating every 30s
+}
+
+var timeUnits = new Array;
+timeUnits['minute'] = 60;
+timeUnits['hour'] = timeUnits['minute'] * 60;
+timeUnits['day'] = timeUnits['hour'] * 24;
+timeUnits['month'] = timeUnits['day'] * 30;
+timeUnits['year'] = timeUnits['day'] * 364;
+var timeUnitOrder = ['year', 'month', 'day', 'hour', 'minute'];
+
+function relativeDate(date) {
+       var now = new Date();
+       var offset = date.getTime() - now.getTime();
+       var seconds = Math.round(Math.abs(offset) / 1000);
+
+       var ret = "";
+       var shown = 0;
+       for (i = 0; i < timeUnitOrder.length; i++) {
+               var unit = timeUnitOrder[i];
+               if (seconds >= timeUnits[unit]) {
+                       var num = Math.floor(seconds / timeUnits[unit]);
+                       seconds -= num * timeUnits[unit];
+                       if (ret)
+                               ret += "and ";
+                       ret += num + " " + unit + (num > 1 ? "s" : "") + " ";
+
+                       if (++shown == 2)
+                               break;
+               }
+               else if (shown)
+                       break;
+       }
+
+       if (! ret)
+               ret = "less than a minute "
+
+       return ret + (offset < 0 ? "ago" : "from now");
+}