initial basic qdls implementation

qdls/.gitignore

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+obj/
+bin/
+.idea/
+

qdls/Program.cs

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+using System.IO;
+
+string[] arguments;
+if(args.Length == 0)
+	arguments = ["."];
+else
+	arguments = args;
+foreach(var arg in arguments) {
+	if(!Path.Exists(arg))
+		Console.WriteLine($"'{arg}: does not exist");
+	if(File.Exists(arg))
+		Console.WriteLine($"'{arg}: is file");
+
+	var children = Directory.GetFileSystemEntries(arg);
+
+	var line = "";
+	var longest = children.OrderByDescending(s => Path.GetFileName(s).Length).First().Length;
+	var columns = Console.WindowWidth / (longest + 2);
+	var position = -1;
+
+	if(args.Length > 1)
+		Console.WriteLine($"{arg}:");
+	foreach(var child in children) {
+		var name = Path.GetFileName(child);
+
+		if(
+			name.StartsWith('.') ||
+			( File.GetAttributes(child) & FileAttributes.Hidden ) == FileAttributes.Hidden
+		)
+			continue;
+
+		if(++position >= columns) {
+			position = -1;
+			Console.WriteLine(line);
+			line = "";
+		}
+		line += name + "  ";
+
+	}
+
+	Console.WriteLine(line);
+}

qdls/qdls.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net8.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+</Project>