winure/qdls/Program.cs

using Qdls;

//	collect args and consume flags
List<string> arguments = args.ToList();

bool showHidden = Util.CheckFlag(arguments, "-a", "--all", "-A");

//	default to "." if no target args
if(arguments.Count == 0)
	arguments = ["."];

//	run on targets
foreach(var arg in arguments) {
	//	don't try to list nonexistent entries or files
	if(!Path.Exists(arg)) {
		Console.WriteLine($"'{arg}': does not exist");
		continue;
	}
	if(File.Exists(arg)) {
		Console.WriteLine($"'{arg}': is file");
		continue;
	}

	//	fetch children
	var children = Directory.GetFileSystemEntries(arg);
	//	exclude hidden files where applicable
	if(!showHidden) { children = children.Where(f => !Util.IsHidden(f)).ToArray(); }

	//	state vars
	var buffer = "";
	var longest = Path.GetFileName(children.OrderByDescending(s => s.Length).First()).Length;
	var columns = Console.WindowWidth / (longest + 2);
	var multiline = columns < children.Count();
	var position = 0;

	//	print names if more than one target
	if(args.Length > 1)
		Console.WriteLine($"{arg}:");
	//	iterate over children; build buffer and output when full
	foreach(var child in children.OrderBy(f => (int)(Path.GetFileName(f)[0]))) {
		var name = Path.GetFileName(child);

		//	format hidden files
		if(Util.IsHidden(child))
			buffer += Format.Hidden;

		//	format directories
		if(Directory.Exists(child))
			buffer += Format.Directory;

		//	if we pass max width, write buffer and clear
		if( (++position > columns) && multiline ) {
			position = 1;
			Console.WriteLine(buffer.TrimEnd());
			buffer = "";
		}
		if(multiline)
			buffer += $"{name}{Format.Reset}".PadRight(longest + 6);	//	magic number 6 is +2 ignoring ansi reset sequence
		else
			buffer += $"{name}{Format.Reset}  ";

	}

	//	print last line
	Console.WriteLine(buffer);
}