#!/usr/bin/cjs

const Clutter = imports.gi.Clutter;
const Gio = imports.gi.Gio;
const GLib = imports.gi.GLib;
const Lang = imports.lang;
const Mainloop = imports.mainloop;

function completeCommand(text) {
    // Replace an escaped space "\ " with a random unicode character, find the
    // last space, and then restore "\ " since we don't want to split at escaped strings
    let last = text.replace(/\\ /g, '\uf001').match(/[^ ]*$/)[0].replace(/\uf001/g, '\\ ');
    if (last.length == 0)
        return ["",[]];

    let last_path = last.replace(/[^/]*$/, "");
    let paths = [];
    if (last.charAt(0) == '/') {
        // Match absolute path
        paths = [last_path];
    } else if (last.length != text.length) {
        // Match filename in home directory
        paths = [GLib.build_filenamev([GLib.get_home_dir(), last_path])];
    } else {
        // Match file in path or home directory
        paths = GLib.getenv('PATH').split(':');
        paths.push(GLib.get_home_dir());
        paths = paths.map(x => GLib.build_filenamev([x, last_path]));
    }

    let results = [];
    paths.forEach(function(path) {
        try {
            let file = Gio.File.new_for_path(path);
            let fileEnum = file.enumerate_children('standard::name,standard::type', Gio.FileQueryInfoFlags.NONE, null);
            let info;

            while ((info = fileEnum.next_file(null))) {
                let name = last_path + info.get_name();
                // Escape strings
                name = name.replace(/ /g, "\\ ")

                if (info.get_file_type() == Gio.FileType.DIRECTORY)
                    name += "/";
                else
                    name += " ";

                if (name.slice(0, last.length) == last)
                    results.push(name);
            }
        } catch (e) {
        }
    });

    if (results.length == 0) return ["", []];

    let common = results.reduce(function(s1, s2) {
        let k = last.length;
        let max = Math.min(s1.length, s2.length);

        while (k < max && s1[k] == s2[k]) k++;

        return s1.substr(0, k);
    });

    return [common.substring(last.length, common.length), results.map(x => x.substring(last.length, x.length))];
}

print(completeCommand("gnome-"))
print(completeCommand("gnome-"))