gnome-shell-extension-freon/freon@UshakovVasilii_Github.yahoo.com/bumblebeeNvidiaUtil.js

const Lang = imports.lang;
const GLib = imports.gi.GLib;
const Gio = imports.gi.Gio;

const Me = imports.misc.extensionUtils.getCurrentExtension();
const CommandLineUtil = Me.imports.commandLineUtil;

const BumblebeeNvidiaUtil = new Lang.Class({
    Name: 'BumblebeeNvidiaUtil',
    Extends: CommandLineUtil.CommandLineUtil,

    _init: function() {
        this.parent();
        // optirun nvidia-smi -q -d TEMPERATURE
        this._path = GLib.find_program_in_path('optirun');
        this._argv = this._path ? [this._path, 'nvidia-smi', '-q', '-d', 'TEMPERATURE'] : null;

        // original source here:
        // https://github.com/meden/gse-bumblebee-indicator
        // thank meden!
        let virtualDisplay = ':8';
		let configFile = Gio.File.new_for_path('/etc/bumblebee/bumblebee.conf');
        let contents = configFile.load_contents(null);
        if (contents[0]) {
            let pattern = /^VirtualDisplay=.*$/m
            let match = new String(pattern.exec(new String(contents)));
            virtualDisplay = match.substr(16);
        }
        let lockFile = '/tmp/.X' + virtualDisplay + '-lock';
        this._lockMonitor = Gio.File.new_for_path(
            lockFile).monitor_file(Gio.FileMonitorFlags.NONE, null
        );
        this._lockMonitor.id = this._lockMonitor.connect(
            'changed', Lang.bind(this, this._statusChanged)
        );
    },

    _detectLabel: function() {
        // optirun nvidia-smi -L
        // GPU 0: GeForce GT 525M (UUID: GPU-...)
        for each(let line in GLib.spawn_command_line_sync(this._path + " nvidia-smi -L")){
        let match = /.*GPU [\d]:([\w\d\ ]+).*/.exec(line);
            if(match){
                this._label = match[1];
                if(this._label)
                    this._label = this._label.trim();
                break;
            }
        }
    },

    _statusChanged: function(monitor, a_file, other_file, event_type) {
        if (event_type == Gio.FileMonitorEvent.CREATED) {
            if(this._argv && !this._label)
                this._detectLabel();
            this._active = true;
        } else if (event_type ==  Gio.FileMonitorEvent.DELETED) {
            this._active = false;
        }
    },

    execute: function(callback) {
        if(this._active)
            this.parent(callback);
        else
            this._output = [];
    },

    get temp() {
        let key = 'bumblebee-nvidia'
        let label = this._label ? this._label : _('Bumblebee + NVIDIA');
        if(!this._active || !this._output)
            return [{label: key, temp: null, displayName: label}];
        //         GPU Current Temp            : 37 C
        for each(let line in this._output) {
            if(!line)
                continue;
            let r;
            if(line.indexOf('GPU Current Temp') > 0)
                return [{
                    label: key,
                    temp: (r = /[\s]*GPU Current Temp[\s]*:[\s]*(\d{1,3}).*/.exec(line)) ? parseFloat(r[1]) : null,
                    displayName: label
                }];
        }

        return [];
    },

    destroy: function(){
        this.parent();
        this._lockMonitor.disconnect(this._lockMonitor.id);
    }

});