improved help text and documented utility functions

src/Info.cs

@@ -13,7 +13,16 @@ public static class Usage {
 		Console.WriteLine(@"Valerie Wolfe <sleeplessval@gmail.com>
 Shows quotes from a set of files.
 
-usage: fortune-cs");
+usage: fortune-cs [flags] [source]
+
+args:
+   [file]                 Manual file selection
+
+flags:
+   -h, --help             Shows this help text
+   -v, --version          Shows version information
+   -l, --list             List files in the fortune directory
+   -m, --merge [files...] Output all distinct lines from a set of files");
 	}
 
 	public static void ListText(string[] files) {

src/Util.cs

@@ -4,9 +4,19 @@ using System.IO;
 
 public static class Utilities {
 
+	///	<summary>
+	///		returns a `List` of all non-flag arguments
+	///	</summary>
+	public static List<string> CollectArgs(string[] args) {
+		var output = new List<string>();
+		foreach(string arg in args)
+			if(!arg.StartsWith("-"))
+				output.Add(arg);
+		return output;
+	}
 
 	///	<summary>
-	///		Checks if a given flag is set in `args`.
+	///		checks if a given flag is set in `args`
 	///	</summary>
 	public static bool HasFlags(string[] args, params string[] flags) {
 		foreach(string flag in flags)
@@ -16,7 +26,11 @@ public static class Utilities {
 		return false;
 	}
 
-	public static void Merge(params string[] files) {
+	///	<summary>
+	///		outputs all unique lines from all files in `args` to stdout
+	///	</summary>
+	public static void Merge(string[] args) {
+		var files = CollectArgs(args);
 		//	hashset to prevent duplicates
 		var members = new HashSet<string>();
 		//	iterate over all paths given