CreamInstaller/CreamInstaller/Utility/Diagnostics.cs

using System;
using System.Diagnostics;
using System.IO;
using Microsoft.Win32;

namespace CreamInstaller.Utility;

internal static class Diagnostics
{
    private static string nppPath;

    private static string NppPath
    {
        get
        {
            nppPath ??= Registry.GetValue(@"HKEY_LOCAL_MACHINE\SOFTWARE\Notepad++", "", null) as string;
            nppPath ??= Registry.GetValue(@"HKEY_LOCAL_MACHINE\SOFTWARE\WOW6432NODE\Notepad++", "", null) as string;
            return nppPath;
        }
    }

    internal static string GetNotepadPath()
    {
        string npp = NppPath + @"\notepad++.exe";
        return npp.FileExists() ? npp : Environment.GetFolderPath(Environment.SpecialFolder.Windows) + @"\notepad.exe";
    }

    internal static void OpenFileInNotepad(string path)
    {
        string npp = NppPath + @"\notepad++.exe";
        if (npp.FileExists())
            OpenFileInNotepadPlusPlus(npp, path);
        else
            OpenFileInWindowsNotepad(path);
    }

    private static void OpenFileInNotepadPlusPlus(string npp, string path) =>
        Process.Start(new ProcessStartInfo { FileName = npp, Arguments = path });

    private static void OpenFileInWindowsNotepad(string path) => Process.Start(new ProcessStartInfo
        { FileName = "notepad.exe", Arguments = path });

    internal static void OpenDirectoryInFileExplorer(string path) => Process.Start(new ProcessStartInfo
        { FileName = "explorer.exe", Arguments = path });

    internal static void OpenUrlInInternetBrowser(string url) =>
        Process.Start(new ProcessStartInfo { FileName = url, UseShellExecute = true });

    internal static string ResolvePath(this string path)
    {
        if (path is null || !path.FileExists() && !path.DirectoryExists())
            return null;
        DirectoryInfo info = new(path);
        if (info.Parent is null)
            return info.Name.ToUpperInvariant();
        string parent = ResolvePath(info.Parent.FullName);
        try
        {
            FileSystemInfo[] infos = info.Parent.GetFileSystemInfos(info.Name);
            string name = infos.Length > 0 ? infos[0].Name : info.Name;
            return parent is null ? name : Path.Combine(parent, name);
        }
        catch
        {
            // Fall back to the raw name if the filesystem call fails (e.g. on a slow external drive)
            return parent is null ? info.Name : Path.Combine(parent, info.Name);
        }
    }
}