@@ -4,15 +4,69 @@
  *
  * Entry point for Polemy interpreter.
  */
 
-import std.stdio;
+import std.stdio;
+import std.algorithm;
+import polemy.value;
+import polemy.lex;
+import polemy.parse;
+import polemy.ast;
+import polemy.eval;
 
-version(unittest) static ~this()
+class REPL
 {
-	writeln( "(Press Enter to finish)" );
-	readln();
+	Table ctx;
+	string buf;
+	Value  lastVal;
+	int lineno = 1;
+	int nextlineno = 1;
+	this() { ctx = createGlobalContext(); }
+
+	bool tryRun( string s )
+	{
+		nextlineno ++;
+		buf ~= s;
+		try {
+			AST a = parseString(buf, "<REPL>", lineno);
+			buf = "";
+			lineno = nextlineno;
+			lastVal = eval(a, ctx);
+		} catch( LexException ) {
+			// always EOF exception, so wait next
+			return false;
+		} catch( ParseException e ) {
+			if( find(e.msg, "EOF") ) // ultra ad-hoc
+				return false;
+			throw e;
+		}
+		return true;
+	}
+
+	bool singleInteraction()
+	{
+		writef(">> ", lineno);
+		string line = readln();
+		if( line.startsWith("exit") || line.startsWith("quit") )
+			return false;
+		try {
+			if( tryRun(line) )
+				writeln(lastVal);
+		} catch(Throwable e) {
+			writeln(e);
+		}
+		return true;
+	}
 }
 
 void main( string[] args )
 {
+	if( args.length <= 1 )
+	{
+		writeln("Welcome to Polemy 0.1.0");
+		for(auto r = new REPL; r.singleInteraction();) {}
+	}
+	else
+	{
+		evalFile(args[1]);
+	}
 }