Add simple repl to krk-sandbox

tools/sandbox.c

@@ -1,14 +1,12 @@
 #include <stdio.h>
+#include <string.h>
 #include <kuroko/kuroko.h>
 #include <kuroko/vm.h>
 #include <kuroko/util.h>
 
+#include "simple-repl.h"
 
 int main(int argc, char * argv[]) {
-	if (argc < 2) {
-		fprintf(stderr, "expected a string to evaluate\n");
-		return 1;
-	}
 	krk_initVM(0);
 
 	krk_tableDelete(&vm.system->fields, OBJECT_VAL(S("module_paths")));
@@ -25,6 +23,7 @@ int main(int argc, char * argv[]) {
 
 	int retval = 0;
 
+	if (argc > 1) {
 		KrkValue result = krk_interpret(argv[1], 0, "<stdin>","<stdin>");
 		if (!IS_NONE(result)) {
 			if (IS_INTEGER(result)) {
@@ -42,6 +41,9 @@ int main(int argc, char * argv[]) {
 			krk_dumpTraceback();
 			retval = 1;
 		}
+	} else {
+		runSimpleRepl();
+	}
 
 	krk_freeVM();
 	return retval;

tools/simple-repl.h

@@ -116,6 +116,8 @@ static int runSimpleRepl(void) {
 					fprintf(stdout, formatStr, AS_CSTRING(result));
 				}
 				krk_resetStack();
+			} else if (krk_currentThread.flags & KRK_HAS_EXCEPTION) {
+				krk_dumpTraceback();
 			}
 			free(allData);
 		}