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

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

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

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

    _init: function() {
        this.parent();
        let path = GLib.find_program_in_path('nvidia-settings');
        this._argv = path ? [path, '-q', 'gpucoretemp', '-t'] : null;
        this._labels = [];
        if(this._argv){
            //     [0] ushakov-pc:0[gpu:0] (GeForce GTX 770)
			let [res, out] = GLib.spawn_command_line_sync(path + " -q gpus")
            for each(let line in out.toString().split('\n')){
                let match = /.*\[gpu:[\d]\].*\(([\w\d\ ]+)\).*/.exec(line);
                if(match){
                    this._labels.push(match[1]);
                }
            }
        }
    },

    get temp() {
        if(!this._output)
            return [];
        let temps = [];
        for each(let line in this._output) {
            if(!line)
                continue;
            temps.push(parseFloat(line));
        }

        let gpus = [];

        if(this._labels.length > 0 && this._labels.length == temps.length - 1){
			// usually we should skip first line (most popular case)
			for(let i = 0; i < this._labels.length; i++){
				gpus.push({ label: this._labels[i], temp: temps[i + 1] })
			}
        } else if(temps.length == 1 || temps.length == 2){
			// cannot parse GPU label, usually temp duplicated
			gpus.push({ label: 'NVIDIA', temp: temps[0] })
		} else {
            // I think it is not possible
		    for(let i = 0; i < temps.length; i++){
		        let label = 'NVIDIA-' + (i + 1);
		        gpus.push({ label: label, temp: temps[i] })
		    }
        }

        return gpus;
    }

});