added usage information

src/Info.cs

@@ -0,0 +1,31 @@
+using System;
+using System.IO;
+
+public static class Globals {
+	public const string VERSION = "0.1.0";
+	public const string DEFAULT_PATH = "/usr/share/fortune-cs/";
+}
+
+public static class Usage {
+
+	public static void HelpText() {
+		VersionText();
+		Console.WriteLine(@"Valerie Wolfe <sleeplessval@gmail.com>
+Shows quotes from a set of files.
+
+usage: fortune-cs [files...]");
+	}
+
+	public static void ListText(string[] files) {
+		foreach(var file in files) {
+			var fileName = Path.GetFileNameWithoutExtension(file);
+			Console.WriteLine(fileName);
+		}
+	}
+
+	public static void VersionText() {
+		Console.WriteLine("fortune-cs v" + Globals.VERSION);
+	}
+
+}
+

src/Program.cs

@@ -2,16 +2,32 @@ using System;
 using System.IO;
 using System.Security.Cryptography;
 
+//	handle help and version flags
+if(Utilities.HasFlags(args, "-h", "--help")) {
+	Usage.HelpText();
+	return 0;
+}
+if(Utilities.HasFlags(args, "-v", "--version")) {
+	Usage.VersionText();
+	return 0;
+}
+
 //	make sure fortune directory exists
-var resourcePath = "/usr/share/fortune-cs/";
+var resourcePath = Globals.DEFAULT_PATH;
 if(!Directory.Exists(resourcePath)) {
-	Console.WriteLine("fortune-cs: directory '/usr/share/fortune-cs/' does not exist");
+	Console.WriteLine($"fortune-cs: directory '${resourcePath}' does not exist");
 	return 1;
 }
 
 //	pull file list
 var files = Directory.GetFiles(resourcePath, "*.txt");
 
+//	handle list flag
+if(Utilities.HasFlags(args, "-l", "--list")) {
+	Usage.ListText(files);
+	return 0;
+}
+
 //	choose a file and line
 var file = files[RandomNumberGenerator.GetInt32(files.Length)];
 var lines = File.ReadAllLines(file);

src/Util.cs

@@ -0,0 +1,17 @@
+using System;
+
+public static class Utilities {
+
+	///	<summary>
+	///		Checks if a given flag is set in `args`.
+	///	</summary>
+	public static bool HasFlags(string[] args, params string[] flags) {
+		foreach(string flag in flags)
+			//	using `Array.IndexOf` since including Linq for `array.Contains` increases binary size
+			if(Array.IndexOf(args, flag) != -1)
+				return true;
+		return false;
+	}
+
+}
+