Add extension files

batime@martin.zurowietz.de/extension.js

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+const ExtensionUtils = imports.misc.extensionUtils;
+const BaTime = ExtensionUtils.getCurrentExtension();
+const Lang = imports.lang;
+const Panel = imports.ui.main.panel;
+
+var BaTimeExtension = new Lang.Class({
+   Name: 'BaTime',
+   _init: function () {
+      this.aggregateMenu = Panel.statusArea['aggregateMenu'];
+      this.originalIndicator = this.aggregateMenu._power;
+      this.customIndicator = new BaTime.imports.power.Indicator();
+      this.aggregateMenu._indicators.replace_child(
+         this.originalIndicator.indicators,
+         this.customIndicator.indicators
+      );
+   },
+   destroy: function () {
+      this.aggregateMenu._indicators.replace_child(
+         this.customIndicator.indicators,
+         this.originalIndicator.indicators
+      );
+   },
+});
+
+let baTime;
+
+function enable() {
+   baTime = new BaTimeExtension();
+}
+
+function disable() {
+   baTime.destroy();
+   baTime = null;
+}

batime@martin.zurowietz.de/metadata.json

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+
+{
+  "shell-version": ["3.28", "3.30"],
+  "uuid": "batime@martin.zurowietz.de",
+  "url": "https://github.com/mzur/gnome-shell-batime",
+  "settings-schema": "org.gnome.shell.extensions.batime",
+  "gettext-domain": "batime",
+  "version": -1,
+  "name": "Battery Time",
+  "description": "Show the remaining time until fully charged/discharged instead of the battery charge in percent in the panel."
+}

batime@martin.zurowietz.de/power.js

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+const Lang = imports.lang;
+const UPower = imports.gi.UPowerGlib;
+
+var Indicator = new Lang.Class({
+   Name: 'PowerIndicator',
+
+   Extends: imports.ui.status.power.Indicator,
+
+   // Adapted from _getStatus of the parent.
+   _getTime() {
+      let seconds = 0;
+
+      if (this._proxy.State == UPower.DeviceState.CHARGING) {
+         seconds = this._proxy.TimeToFull;
+      } else if (this._proxy.State == UPower.DeviceState.DISCHARGING) {
+         seconds = this._proxy.TimeToEmpty;
+      } else {
+         // state is one of PENDING_CHARGING, PENDING_DISCHARGING
+         return _("Estimating…");
+      }
+
+      let time = Math.round(seconds / 60);
+      if (time == 0) {
+         // 0 is reported when UPower does not have enough data
+         // to estimate battery life
+         return _("Estimating…");
+      }
+
+      let minutes = time % 60;
+      let hours = Math.floor(time / 60);
+
+      // Translators: this is <hours>:<minutes>
+      return _("%d\u2236%02d").format(hours, minutes);
+   },
+
+   _sync() {
+      this.parent();
+      this._percentageLabel.clutter_text.set_markup('<span size="smaller">' + this._getTime() + '</span>');
+   },
+});