make confirm work

.zshrc

@@ -93,7 +93,7 @@ function k()
 function rscript ()
 {
 	TDIR=$(mktemp -d)
-	rustc -v -C lto -C opt-level=3 $1 -o $TDIR/rscript_executable
+	rustc -v -C opt-level=3 $1 -o $TDIR/rscript_executable
 	$TDIR/rscript_executable ${@:2}
 	rm -rf $TDIR
 }
@@ -134,19 +134,25 @@ fi
 return $ret
 }
 function confirm() {
-	bash -c "
-	echo \"To be executed: $@\";
-	read -p \"Confirm (Y/N): \" -n 1 -r;
-	case \"\$REPLY\" in
-		y|Y ) echo \"es\"; eval $@;;
-		n|N ) echo \"o\";;
-		* ) echo -e \"\ninvalid\";;
-	esac" $@
+		CMD=$@
+		echo "Execute: '$CMD' ?";
+		echo -n "[Y/n]: "
+		# a weid difference between zsh and bash
+		if [[ "$SHELL" =~ (.*zsh) ]]; then
+			read -s -k1;
+		else
+			read -s -n1;
+		fi
+		case "${REPLY}" in
+			y|Y|$'\n'|" "|"A"|"" ) echo yes;eval $CMD;;
+			n|N ) echo no;echo 'Aborted.' ; return 1;;
+			* ) echo -e 'Invalid choice, aborted.'; return 2;;
+		esac;
 }
 function confirm-important() {
 	echo "Write 'yes do as i say' to confirm that you REALLY want to do this: $@"
 	read
-	if [[ "${REPLY,,}" = "yes do as i say" ]]
+	if [[ "${REPLY}" = "yes do as i say" ]]
 	then
 		eval $@
 	else