1 files changed, 90 insertions, 0 deletions
diff --git a/mailnews/base/util/templateUtils.js b/mailnews/base/util/templateUtils.js
new file mode 100644
index 000000000..d90f16abd
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+++ b/mailnews/base/util/templateUtils.js
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+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+var EXPORTED_SYMBOLS = ["PluralStringFormatter", "makeFriendlyDateAgo"];
+
+var Cc = Components.classes;
+var Ci = Components.interfaces;
+var Cr = Components.results;
+var Cu = Components.utils;
+
+Cu.import("resource://gre/modules/PluralForm.jsm");
+Cu.import("resource:///modules/StringBundle.js");
+
+function PluralStringFormatter(aBundleURI) {
+  this._bundle = new StringBundle(aBundleURI);
+}
+
+PluralStringFormatter.prototype = {
+  get: function(aStringName, aReplacements, aPluralCount) {
+    let str = this._bundle.get(aStringName);
+    if (aPluralCount !== undefined)
+      str = PluralForm.get(aPluralCount, str);
+    if (aReplacements !== undefined) {
+      for (let i = 0; i < aReplacements.length; i++)
+        str = str.replace("#" + (i+1), aReplacements[i]);
+    }
+    return str;
+  },
+};
+
+
+var gTemplateUtilsStrings = new PluralStringFormatter(
+  "chrome://messenger/locale/templateUtils.properties"
+);
+
+/**
+ * Helper function to generate a localized "friendly" representation of
+ * time relative to the present.  If the time input is "today", it returns
+ * a string corresponding to just the time.  If it's yesterday, it returns
+ * "yesterday" (localized).  If it's in the last week, it returns the day
+ * of the week. If it's before that, it returns the date.
+ *
+ * @param time
+ *        the time (better be in the past!)
+ * @return The string with a "human-friendly" representation of that time
+ *        relative to now.
+ */
+function makeFriendlyDateAgo(time)
+{
+  let dts = Cc["@mozilla.org/intl/scriptabledateformat;1"]
+              .getService(Ci.nsIScriptableDateFormat);
+
+  // Figure out when today begins
+  let now = new Date();
+  let today = new Date(now.getFullYear(), now.getMonth(),
+                       now.getDate());
+
+  // Get the end time to display
+  let end = time;
+
+  // Figure out if the end time is from today, yesterday,
+  // this week, etc.
+  let dateTime;
+  let kDayInMsecs = 24 * 60 * 60 * 1000;
+  let k6DaysInMsecs = 6 * kDayInMsecs;
+  if (end >= today) {
+    // activity finished after today started, show the time
+    dateTime = dts.FormatTime("", dts.timeFormatNoSeconds,
+                                  end.getHours(), end.getMinutes(),0);
+  } else if (today - end < kDayInMsecs) {
+    // activity finished after yesterday started, show yesterday
+    dateTime = gTemplateUtilsStrings.get("yesterday");
+  } else if (today - end < k6DaysInMsecs) {
+    // activity finished after last week started, show day of week
+    dateTime = end.toLocaleFormat("%A");
+  } else if (now.getFullYear() == end.getFullYear()) {
+    // activity must have been from some time ago.. show month/day
+    let month = end.toLocaleFormat("%B");
+    // Remove leading 0 by converting the date string to a number
+    let date = Number(end.toLocaleFormat("%d"));
+    dateTime = gTemplateUtilsStrings.get("monthDate", [month, date]);
+  } else {
+    // not this year, so show full date format
+    dateTime = dts.FormatDate("", dts.dateFormatShort,
+                              end.getFullYear(), end.getMonth() + 1,
+                              end.getDate());
+  }
+  return dateTime;
+}