session-desktop/js/views/timestamp_view.js

(function() {
  'use strict';
  window.Whisper = window.Whisper || {};

  Whisper.TimestampView = Whisper.View.extend({
    initialize: function(options) {
      extension.windows.onClosed(this.clearTimeout.bind(this));
    },
    update: function() {
      this.clearTimeout();
      var millis_now = Date.now();
      var millis = this.$el.data('timestamp');
      if (millis === '') {
        return;
      }
      if (millis >= millis_now) {
        millis = millis_now;
      }
      var result = this.getRelativeTimeSpanString(millis);
      this.$el.text(result);

      var timestamp = moment(millis);
      this.$el.attr('title', timestamp.format('llll'));

      var millis_since = millis_now - millis;
      if (this.delay) {
        if (this.delay < 0) {
          this.delay = 1000;
        }
        this.timeout = setTimeout(this.update.bind(this), this.delay);
      }
    },
    clearTimeout: function() {
      clearTimeout(this.timeout);
    },
    getRelativeTimeSpanString: function(timestamp_) {
      // Convert to moment timestamp if it isn't already
      var timestamp = moment(timestamp_),
        now = moment(),
        timediff = moment.duration(now - timestamp);

      if (timediff.years() > 0) {
        this.delay = null;
        return timestamp.format(this._format.y);
      } else if (timediff.months() > 0 || timediff.days() > 6) {
        this.delay = null;
        return timestamp.format(this._format.M);
      } else if (timediff.days() > 0) {
        this.delay = moment(timestamp)
          .add(timediff.days() + 1, 'd')
          .diff(now);
        return timestamp.format(this._format.d);
      } else if (timediff.hours() > 1) {
        this.delay = moment(timestamp)
          .add(timediff.hours() + 1, 'h')
          .diff(now);
        return this.relativeTime(timediff.hours(), 'h');
      } else if (timediff.hours() === 1) {
        this.delay = moment(timestamp)
          .add(timediff.hours() + 1, 'h')
          .diff(now);
        return this.relativeTime(timediff.hours(), 'h');
      } else if (timediff.minutes() > 1) {
        this.delay = moment(timestamp)
          .add(timediff.minutes() + 1, 'm')
          .diff(now);
        return this.relativeTime(timediff.minutes(), 'm');
      } else if (timediff.minutes() === 1) {
        this.delay = moment(timestamp)
          .add(timediff.minutes() + 1, 'm')
          .diff(now);
        return this.relativeTime(timediff.minutes(), 'm');
      } else {
        this.delay = moment(timestamp)
          .add(1, 'm')
          .diff(now);
        return this.relativeTime(timediff.seconds(), 's');
      }
    },
    relativeTime: function(number, string) {
      return moment.duration(number, string).humanize();
    },
    _format: {
      y: 'll',
      M: i18n('timestampFormat_M') || 'MMM D',
      d: 'ddd',
    },
  });
  Whisper.ExtendedTimestampView = Whisper.TimestampView.extend({
    relativeTime: function(number, string, isFuture) {
      return moment.duration(-1 * number, string).humanize(string !== 's');
    },
    _format: {
      y: 'lll',
      M: (i18n('timestampFormat_M') || 'MMM D') + ' LT',
      d: 'ddd LT',
    },
  });
})();