Utility that starts Anki with its base set to an USB drive.

AnkiPicker.cs

/* Copyright (C) 2021, Manuel Meitinger
 * 
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 2 of the License, or
 * (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#nullable enable

using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Drawing;
using System.IO;
using System.Linq;
using System.Runtime.InteropServices;
using System.Windows.Forms;

static class Program
{
    [DllImport("User32.dll", ExactSpelling = true, CharSet = CharSet.Unicode, SetLastError = true)]
    static extern bool AllowSetForegroundWindow(int dwProcessId);

    static void LaunchAtDrive(DriveInfo drive)
    {
        var psi = new ProcessStartInfo()
        {
            FileName = Path.Combine(Application.StartupPath, "anki.exe"),
            UseShellExecute = false,
        };
        psi.EnvironmentVariables.Add("ANKI_BASE", Path.Combine(drive.Name, "Anki"));
        using var process = Process.Start(psi);
        AllowSetForegroundWindow(process.Id);
    }

    static DriveInfo? PickDrive(IEnumerable<DriveInfo> drives)
    {
        var selectedDrive = (DriveInfo?)null;
        var form = new Form()
        {
            AutoSize = true,
            ClientSize = new Size(0, 0),
            FormBorderStyle = FormBorderStyle.FixedToolWindow,
            StartPosition = FormStartPosition.CenterScreen,
            Text = "USB-Stick für Anki auswählen...",
        };
        var panel = new FlowLayoutPanel()
        {
            AutoSize = true,
            FlowDirection = FlowDirection.TopDown,
            Margin = new Padding(0, 0, 0, 0),
            Size = new Size(0, 0),
            WrapContents = false,
        };
        foreach (var drive in drives)
        {
            var button = new Button()
            {
                Text = $"{drive.VolumeLabel} ({drive.Name})",
                UseVisualStyleBackColor = true,
                Width = 200,
            };
            button.Click += (_, _) =>
            {
                selectedDrive = drive;
                form.Close();
            };
            panel.Controls.Add(button);
        }
        form.Controls.Add(panel);
        form.ShowDialog();
        return selectedDrive;
    }

    public static void Main()
    {
        try
        {
            Application.EnableVisualStyles();
            Application.SetCompatibleTextRenderingDefault(false);
            var drives = DriveInfo.GetDrives().Where(d => d.IsReady && d.DriveType == DriveType.Removable);
            var drive = drives.Count() switch
            {
                0 => throw new DriveNotFoundException("Es wurde kein USB-Stick gefunden."),
                1 => drives.Single(),
                _ => PickDrive(drives),
            };
            if (drive is not null)
            {
                LaunchAtDrive(drive);
            }
        }
        catch (Exception e)
        {
            MessageBox.Show(e.Message, e.Source, MessageBoxButtons.OK, MessageBoxIcon.Error);
        }
    }
}