dlang Buridan's

asino.d

@@ -1,12 +1,5 @@
 /**
 	Buridan's Donkey, Asino.
-
-	...a man, being just as hungry as thirsty, 
-	and placed in between food and drink, 
-	must necessarily remain where he is and starve to death.
-
-	- Aristole
-
     Copyright: Francesco Mecca
 	License: GPLv3
 	Author: Francesco Mecca
@@ -18,35 +11,67 @@ import std.random;
 import std.getopt;
 import std.file;
 import std.conv;
+import std.array;
+import std.algorithm;
+
+extern(C)
+{
+	struct pollfd { int   fd; short events; short revents; }
+	int poll(pollfd *fds, int nfds, int timeout);
+}
+
+string versionSt = "...a man, being just as hungry as thirsty,
+and placed in between food and drink,
+must necessarily remain where he is and starve to death.
+
+Aristole";
+
 
 void
 main (string[] args)
 {
-	bool num = false;
+	bool num, v;
 	string engine = "mt";
+	string div;
 	auto cliOpts = getopt(
 			args,
 			"numbers|n", "enable number output on screen", &num,
+			"divider|d", "divide the arguments using a different divider", &div,
+			"version|v", "show version and exit", &v,
 			"engine|e", "Choose the RNG between \"mt\" (Mersenne-Twister, default), \"x\" (xorshift),
 				\"dr\" (/dev/random), \"du\" (/dev/urandom)", &engine
 			);
 
     if(cliOpts.helpWanted){
-     	defaultGetoptPrinter("Buridan's Donkey", cliOpts.options);
+     	defaultGetoptPrinter("Buridan's Donkey\nSort a list of strings randomly", cliOpts.options);
      	return;
+ 	} else if(v){
+ 		writeln(versionSt);
  	}
 
-	args = args[1 .. $]; // remove program name
-	args.shuffle(engine);
-	//writeln(typeid(gen));
+	string[] toProcess = void;
+	if(isaTTY()){
+		// read stdin, ignore cli args
+		toProcess = to!(string[])(stdin.byLine().array());
+	} else {
+		toProcess = args[1 .. $]; // remove program name
+	}
 
-	foreach (i, arg; args) {
+	auto res = toProcess.divide(div).shuffle(engine);
+
+	foreach (i, arg; res) {
 		if (!num) writeln(arg);
 		else writefln("%s: %s", i, arg);
 	}
 }
 
-void shuffle(ref string[] args, string t)
+string[] divide(string[] args, string div)
+{
+	if (div == "") return args;
+	else return to!(string[])(args.join.splitter(div).array);
+}
+
+string[] shuffle(string[] args, string t)
 {
 	if(t == "mt"){
 		Mt19937 gen;
@@ -65,6 +90,7 @@ void shuffle(ref string[] args, string t)
 	} else {
 		throw new Exception("Wrong arguments");
 	}
+	return args;
 }
 
 
@@ -84,38 +110,24 @@ template DevRandomGen(string gen)
     	enum UIntType max = ubyte.max;
     	string src = gen;
 
-
-		/**
-	  	  * Unused for /dev/random
-	  	  */
     	void seed(UIntType x0) @safe pure nothrow @nogc {}
-
-
-    	/**
-     	 * Returns the current number in the random sequence.
-     	 */
-    	@property
-    	UIntType front() const// @safe pure nothrow @nogc
-    	{
-        	//auto a = to!UIntType("/dev/random".read(UIntType.sizeof));
-        	//return to!UIntType(a);
-			return (cast(ubyte[])(src.read(ubyte.sizeof)))[0];
-    	}
-
-
-    	/**
-     	 * Advances the random sequence.
-     	 */
     	void popFront() @safe pure nothrow @nogc {}
 
-
-    	/**
-     	 * Captures a range state.
-     	 */
     	@property
-    	typeof(this) save() @safe pure nothrow @nogc
+    	UIntType front() const { return (cast(ubyte[])(src.read(ubyte.sizeof)))[0]; }
+
+    	@property
+    	typeof(this) save() @safe pure nothrow @nogc { return this; }
+	}
+}
+
+bool isaTTY()
 {
-        	return this;
-    	}
-	}
+	pollfd fds;
+	int ret;
+
+	fds.fd = 0;
+	fds.events = 0;
+	ret = poll(&fds, 1, 0);
+	return ret > 0;
 }