nvidiaUtil: code cleanup, fix recognizing the card (#242)

Since the card list is populated only in constructor, to update it we
had to toggle "Nvidia" switch `on`->`off`->`on`.

The fix is to get the temperature along with the card name in one
`nvidia-smi` call.

Also some code cleanup was made, removed old unused code.

Fixes #241

Signed-off-by: Pavel Artsishevsky <polter.rnd@gmail.com>

freon@UshakovVasilii_Github.yahoo.com/nvidiaUtil.js

@@ -10,59 +10,25 @@ var NvidiaUtil = class extends CommandLineUtil.CommandLineUtil {
     constructor() {
         super();
         let path = GLib.find_program_in_path('nvidia-smi');
-        this._argv = path ? [path, '--query-gpu=temperature.gpu', '--format=csv,noheader'] : null;
+        this._argv = path ? [path, '--query-gpu=name,temperature.gpu', '--format=csv,noheader'] : null;
-        this._labels = [];
-        if(this._argv){
-            //     [0] ushakov-pc:0[gpu:0] (GeForce GTX 770)
-            let [exit, pid, stdinFd, stdoutFd, stderrFd] =
-                GLib.spawn_async_with_pipes(null, /* cwd */
-                                            [path, '--query-gpu=name', '--format=csv,noheader'], /* args */
-                                            null, /* env */
-                                            GLib.SpawnFlags.DO_NOT_REAP_CHILD,
-                                            null /* child_setup */);
-
-            let stdout = new Gio.UnixInputStream({fd: stdoutFd, close_fd: true});
-            let outReader = new Gio.DataInputStream({base_stream: stdout});
-
-            GLib.close(stdinFd);
-            GLib.close(stderrFd);
-            let childWatch = GLib.child_watch_add(GLib.PRIORITY_DEFAULT, pid, (pid, status, requestObj) => {
-                  let output = [];
-                  let [line, size] = [null, 0];
-
-                  while (([line, size] = outReader.read_line(null)) != null && line != null) {
-                      this._labels.push(ByteArray.toString(line));
-                  }
-
-                  stdout.close(null);
-                  GLib.source_remove(childWatch);
-            });
-        }
     }
 
     get temp() {
-        let output = [];
-        if(this._output)
-          output.push(...this._output)
-        if(this._error_output)
-          output.push(...this._error_output)
-
-        if(output.length === 0)
-            return [];
-        let temps = [];
-        for (let line of this._output) {
-            let convertedLine = parseFloat(line);
-
-            if(!line || !convertedLine)
-                continue;
-            temps.push(convertedLine);
-        }
-
         let gpus = [];
 
-        if(this._labels.length == temps.length){
+        if (this._output) {
-            for(let i = 0; i < this._labels.length; i++){
+            for (let line of this._output) {
-                gpus.push({ label: this._labels[i], temp: temps[i] })
+                let values = line.split(',');
+                if (values.length < 2)
+                    continue;
+
+                let label = values[0].trim();
+                let temp = parseFloat(values[1]);
+
+                if(!label || !temp)
+                    continue;
+
+                gpus.push({ label: label, temp: temp });
             }
         }