merged in specify-file branch

src/Info.cs

@@ -0,0 +1,40 @@
+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 [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) {
+		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

@@ -2,25 +2,75 @@ using System;
 using System.IO;
 using System.Security.Cryptography;
 
+//	handle help flag
+if(Utilities.HasFlags(args, "-h", "--help")) {
+	Usage.HelpText();
+	return 0;
+}
+
+//	handle version flag
+if(Utilities.HasFlags(args, "-v", "--version")) {
+	Usage.VersionText();
+	return 0;
+}
+
+//	collect nonflag args for merge or file selection
+var arguments = Utilities.CollectArgs(args);
+
+//	handle merge flag
+if(Utilities.HasFlags(args, "-m", "--merge")) {
+	Utilities.Merge(arguments);
+	return 0;
+}
+
+//	get resource path from var or default
+string resourcePath = Environment.GetEnvironmentVariable("FORTUNE_CS_DIR");
+if(resourcePath == "" || !Directory.Exists(resourcePath))
+	resourcePath = Globals.DEFAULT_PATH;
+
+//	pull file arg if provided
+string file = null;
+if(arguments.Count == 1) {
+	file = arguments[0];
+	//	if the file doens't exist, see if it's in `resourcePath`
+	if(!File.Exists(file)) {
+		if(!file.EndsWith(".txt"))
+			file = file + ".txt";
+		file = resourcePath + file;
+		if(!File.Exists(file)) {
+			//	don't try to read a file that doesn't exist
+			Console.WriteLine($"fortune-cs: no file '{file}' found.");
+			return 2;
+		}
+	}
+}
+
 //	make sure fortune directory exists
-var resourcePath = "/usr/share/fortune-cs/";
 if(!Directory.Exists(resourcePath)) {
-	Console.WriteLine("fortune-cs: directory '/usr/share/fortune-cs/' does not exist");
+	Console.WriteLine($"fortune-cs: directory '${resourcePath}' does not exist");
 	return 1;
 }
 
 //	pull file list
 var files = Directory.GetFiles(resourcePath, "*.txt");
 
-//	choose a file and line
-var file = files[RandomNumberGenerator.GetInt32(files.Length)];
+//	handle list flag
+if(Utilities.HasFlags(args, "-l", "--list")) {
+	Usage.ListText(files);
+	return 0;
+}
+
+//	choose file if not provided
+if(file == null)
+	file = files[RandomNumberGenerator.GetInt32(files.Length)];
+//	read the file and choose a line
 var lines = File.ReadAllLines(file);
 var line = lines[RandomNumberGenerator.GetInt32(lines.Length)];
 
-//	process escape codes
+//	process line breaks
 line = line.Replace("\\n", "\n");
 
-//	write
+//	write the fortune
 Console.WriteLine(line);
 
 return 0;

src/Util.cs

@@ -0,0 +1,54 @@
+using System;
+using System.Collections.Generic;
+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`
+	///	</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;
+	}
+
+	///	<summary>
+	///		outputs all unique lines from all files in `files` to stdout
+	///	</summary>
+	public static void Merge(List<string> files) {
+		//	hashset to prevent duplicates
+		var members = new HashSet<string>();
+		//	iterate over all paths given
+		foreach(var file in files) {
+			//	skip nonexistent files gracefully
+			if(!File.Exists(file))
+				continue;
+			//	iterate over lines
+			var lines = File.ReadAllLines(file);
+			foreach(var line in lines) {
+				//	prevent duplicates
+				if(members.Contains(line))
+					continue;
+				members.Add(line);
+				//	emit to stdout
+				Console.WriteLine(line);
+			}
+		}
+	}
+
+}
+