/*  
 dotnet-script  search.cs  dotnet.exe
 searching path to files like `node`, `curl`, `dotnet.exe` in folders defined by the environment variable "Path"
*/
#nullable enable

//filename to search
string? pattern = null;
if (Args.Count() > 0)
{
    pattern = Args[0].Trim();
}
else
{
 Console.WriteLine("arg is not specified");
 return;
}

bool TryGetPath(string scriptName, out string? res){
    var path = (Environment.GetEnvironmentVariables()["Path"] as string)!;
    var paths = path.Split(';');

    foreach (var p in paths)
    {
        if (!Directory.Exists(p)) continue;

        var file = Directory.GetFiles(p, scriptName, SearchOption.TopDirectoryOnly).SingleOrDefault();
        if (file is not null)
        {
            res = file;
            return true;
        }
    }
    res = null;
    return false;
}


if (TryGetPath(pattern!, out string? result))
{
    Console.WriteLine($"Path to {pattern}:\n{result}");
}
else
{
    Console.WriteLine($"No `{pattern}` found.");
}