Program.cs

namespace locus;

public static class SysInfo
{
    public static string Username = "user";
    public static string Hostname = "locus";

    public static bool setup = false;
}

public class Program
{
    Node root = new Node("root", true);
    Node currentFolder;

    static void Main()
    {
        bool running = true;
        Console.CancelKeyPress += (sender, e) =>
        {
            e.Cancel = true;
            running = false;
            Resonate.Current?.Dispose();
            Jot.Current?.Dispose();
            System.Environment.Exit(0);
        };

        Console.Clear();

        Console.WriteLine("Hello, World! Welcome to my rudimentary file system.");
        Console.WriteLine("Use the help command to see available commands.");

        Program program = new Program();
        program.currentFolder = program.root;

        Node home = new Node("home", true, program.currentFolder, DateTime.Now);
        program.currentFolder.Children.Add(home);

        program.currentFolder = home;

        while (running)
        {
            if (running)
            {
                Console.Write($"{SysInfo.Username}@{SysInfo.Hostname}:/\u001b[34m\u001b[1m" + program.root.FullPath + "\u001b[0m" + "> ");
            }
            program.console();
        }
    }

    public class FileSystemEntry
    {
        public string Name { get; set; }
        public bool IsDirectory { get; set; }
        public List<byte> Content { get; set; } // only used if IsDirectory is false
        public List<FileSystemEntry> Children { get; set; } // only used if IsDirectory is true
    }

    public void console(bool script = false, string input = "")
    {
        var commands = new Dictionary<string, string>
        {
            ["help"] = "Displays a list of available commands.",
            ["ls"] = "Lists the contents of the current directory.",
            ["cd"] = "Changes the current directory.\n\nUsage: cd <directory_name> or cd .. to go up.",
            ["mkdir"] = "Creates a new directory.\n\nUsage: mkdir <directory_name>",
            ["touch"] = "Creates a new file.\n\nUsage: touch <file_name>",
            ["rm"] = "Removes a file or directory.\n\nUsage: rm <name>",
            ["echo"] = "Prints text to the console.\n\nUsage: echo <text>",
            ["cat"] = "Displays the contents of a file.\n\nUsage: cat <file_name>",
            ["write"] = "Edits the contents of a file using a line editor.\n\nUsage: write <file_name>",
            ["jot"] = "Edits the contents of a file using a TUI.\n\nUsage: jot <file_name>",
            ["coda"] = "Edits the raw hex contents of a file using a line editor.\n\nUsage: coda <file_name>",
            ["script"] = "Executes commands from a script file.\n\nUsage: script <file_name>",
            ["push"] = "Pushes a file from the virtual filesystem to the host filesystem.\n\nUsage: push <file_name> <absolute_host_path_to_file>",
            ["pull"] = "Pulls a file from the host filesystem into the virtual filesystem.\n\nUsage: pull <absolute_host_path_to_file> <file_name>",
            ["glyph"] = "Renders an image file as ASCII art in the console.\n\nUsage: glyph <file_name>",
            ["info"] = "Displays information about a file or directory.\n\nUsage: info <name>",
            ["man"] = "Hey... you already know how to use the manual!\n\nUsage: man <command>",
            ["resonate"] = "Plays an audio file using a TUI.\n\nUsage: resonate <file_name>",
            ["loom"] = "Executes a C# file.\n\nUsage: loom <file_name>",
            ["username"] = "Sets the username.\n\nUsage: username <new_username>",
            ["hostname"] = "Sets the hostname.\n\nUsage: hostname <new_hostname>",
            ["fitr"] = "Text-based choose your own adventure game.\n\nUsage: fitr <file_name>",
        };
        string command = string.Empty;

        if (!script)
        {
            input = Console.ReadLine() ?? string.Empty;
        }

        if (!SysInfo.setup)
        {
            Commands.Init(ref root);
            SysInfo.setup = true;
        }

        command = GetCommand(input);
        if (string.IsNullOrEmpty(command))
        {
            return;
        }

        if (commands.ContainsKey(command))
        {
            Console.Write("\u001b[0m");
            Commands.Run(command, input, commands, ref currentFolder, ref root, this, ref SysInfo.Username, ref SysInfo.Hostname);
        }
        else
        {
            Console.WriteLine("unknown command :(\ntype 'help' for a list of commands, and 'man <command>' for command-specific help");
        }
    }

    public static string GetCommand(string input)
    {
        if (string.IsNullOrWhiteSpace(input))
            return string.Empty;

        input = input.Trim();

        string[] parts = input.Split(
            new char[] { ' ', '\t', '\n', '\r' },
            StringSplitOptions.RemoveEmptyEntries
        );

        if (parts.Length == 0)
            return string.Empty;
        
        string firstWord = new string(parts[0]
            .SkipWhile(c => !char.IsLetterOrDigit(c))
            .ToArray());

        return firstWord;
    }

    public static string GetArgs(string input)
    {
        if (string.IsNullOrWhiteSpace(input))
        {
            return string.Empty;
        }

        int firstSpaceIndex = input.IndexOf(' ');
        if (firstSpaceIndex == -1)
        {
            return string.Empty;
        }

        return input[(firstSpaceIndex + 1)..].Trim();
    }
}