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

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

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

    _init: function(){
        this._argv = null;
    },

    execute: function(callback) {
        try{
            this._callback = callback;
            let [exit, pid, stdinFd, stdoutFd, stderrFd] =
                GLib.spawn_async_with_pipes(null, /* cwd */
                                            this._argv, /* 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, Lang.bind(this, function(pid, status, requestObj) {
                let output = [];
                let [line, size] = [null, 0];
                while (([line, size] = outReader.read_line(null)) != null && line != null) {
                    if(line)
                        output.push(line.toString());
                }

                stdout.close(null);
                GLib.source_remove(childWatch);
                this._output = output;
                callback();
            }));
        } catch(e){
            global.log(e.toString());
        }
    },

    get available(){
        return this._argv != null;
    },

    destroy: function(){
        this._argv = null;
    }

});