using System.Text.RegularExpressions;
internal class Program
{
static List<DirectoryInfo> path = null!;
private static void Main(string[] args)
{
path =
[..Environment.GetEnvironmentVariable("PATH")!.Split(Path.PathSeparator)
.Select(p => new DirectoryInfo(p))];
while (true)
{
Console.Write("$ ");
string? commandString = Console.ReadLine();
Command command = new(commandString);
command.CommandAction.Invoke();
}
}
class Command
{
public string Name { get; }
public IEnumerable<string> Args { get; }
public string Type { get; } = "a shell builtin";
public Action CommandAction { get; }
public Command(string? commandString)
{
var splitString = Regex.Matches(commandString, @"[^\s""']+|'([^']*)'|[\s]*")
.Cast<Match>()
.Select(m => m.Value);
splitString = splitString.Select(s => (string.IsNullOrWhiteSpace(s) && s.Length > 1) ? " " : s)
.Select(s => s.Trim('\''));
Name = splitString.First();
Args = splitString.Skip(2);
foreach (var dir in path)
{
string fullPath = Path.Combine(dir.FullName, Name);
if (File.Exists(fullPath))
{
Type = fullPath; // <<<< bu yerda topilgan yo‘l /bin/cat bo‘ladi
CommandAction = () =>
{
var process = Process.Start(new ProcessStartInfo(Name, Args.Where(x => !string.IsNullOrWhiteSpace(x))));
process?.WaitForExit();
};
return;
}
}
switch (Name)
{
case "exit":
CommandAction = () => Environment.Exit(0);
return;
case "echo":
CommandAction = () => Console.WriteLine(string.Join("",Args));
return;
case "cat":
CommandAction = () =>
{
if (Args.Count() == 0)
{
Console.WriteLine("cat: missing argument");
return;
}
foreach (var arg in Args)
{
if (File.Exists(arg))
{
Console.Write(File.ReadAllText(arg));
}
}
};
return;
case "type":
Args = Args.Where(a => !string.IsNullOrWhiteSpace(a));
CommandAction = () =>
{
Command typedCommand = new(Args.First());
if (typedCommand.Type == "invalid")
Console.WriteLine($"{typedCommand.Name}: not found");
else
Console.WriteLine($"{typedCommand.Name} is {typedCommand.Type}");
};
return;
case "pwd": // print working directory
Args = Args.Where(a => !string.IsNullOrWhiteSpace(a));
CommandAction = () =>
Console.WriteLine(Directory.GetCurrentDirectory());
return;
case "cd":
Args = Args.Where(a => !string.IsNullOrWhiteSpace(a));
CommandAction = () =>
{
if (Args.Count() == 0)
{
Console.WriteLine("cd: missing argument");
return;
}
else
{
var target = Args.First();
if (target == "..")
{
Directory.SetCurrentDirectory(
Directory.GetParent(
Directory.GetCurrentDirectory())!.FullName);
}
else if (target == "~")
{
var home = Environment.GetFolderPath(
Environment.SpecialFolder.UserProfile);
Directory.SetCurrentDirectory(home);
}
else if (target.StartsWith("~/"))
{
var home = Environment.GetFolderPath(
Environment.SpecialFolder.UserProfile);
Directory.SetCurrentDirectory(Path.Combine(home, target[2..]));
}
else
{
var dir = new DirectoryInfo(target);
if (dir.Exists)
{
Directory.SetCurrentDirectory(dir.FullName);
}
else
{
Console.WriteLine($"cd: {target}: No such file or directory");
}
}
}
};
return;
default:
Args = Args.Where(a => !string.IsNullOrWhiteSpace(a));
foreach (var dir in path)
{
string path = Path.Combine(dir.FullName, Name);
if (File.Exists(path))
{
Type = path;
CommandAction = () =>
{
var process = Process.Start(new ProcessStartInfo(Name, Args.Where(x => !string.IsNullOrWhiteSpace(x))));
process?.WaitForExit();
};
return;
}
}
CommandAction = () => Console.WriteLine($"{Name}: command not found");
Type = "invalid";
return;
}
}
}
}```Hey @SardorSohinazarov, could you let us know which stage you’re on and share any error messages you’re seeing? That’ll help us debug more effectively.
Closing this thread due to inactivity. If you still need assistance, feel free to reopen or start a new discussion!
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