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-rw-r--r--ikiwiki/relativedate.js75
1 files changed, 75 insertions, 0 deletions
diff --git a/ikiwiki/relativedate.js b/ikiwiki/relativedate.js
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+// Causes html elements in the 'relativedate' class 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('relativedate');
+ 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 = [
+ { unit: 'year', seconds: 60 * 60 * 24 * 364 },
+ { unit: 'month', seconds: 60 * 60 * 24 * 30 },
+ { unit: 'day', seconds: 60 * 60 * 24 },
+ { unit: 'hour', seconds: 60 * 60 },
+ { unit: 'minute', seconds: 60 },
+];
+
+function relativeDate(date) {
+ var now = new Date();
+ var offset = date.getTime() - now.getTime();
+ var seconds = Math.round(Math.abs(offset) / 1000);
+
+ // hack to avoid reading just in the future if there is a minor
+ // amount of clock slip
+ if (offset >= 0 && seconds < 30 * 60 * 60) {
+ return "just now";
+ }
+
+ var ret = "";
+ var shown = 0;
+ for (i = 0; i < timeUnits.length; i++) {
+ if (seconds >= timeUnits[i].seconds) {
+ var num = Math.floor(seconds / timeUnits[i].seconds);
+ seconds -= num * timeUnits[i].seconds;
+ if (ret)
+ ret += "and ";
+ ret += num + " " + timeUnits[i].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");
+}