reset current input in ReadQueryTerm

src/prolog/machine/streams.rs

@@ -540,7 +540,10 @@ impl Stream {
 
     // returns true on success.
     #[inline]
+    pub(super)
     fn reset(&mut self) -> bool {
+        self.stream_inst.0.borrow_mut().0 = false;
+
         match self.stream_inst.0.borrow_mut().1 {
             StreamInstance::Bytes(ref mut cursor) => {
                 cursor.set_position(0);
@@ -550,8 +553,7 @@ impl Stream {
                 file.seek(SeekFrom::Start(0)).unwrap();
                 true
             }
-            StreamInstance::ReadlineStream(ref mut stream) => {
-                *stream = ReadlineStream::new(String::new());
+            StreamInstance::ReadlineStream(_) => {
                 true
             }
             _ => {

src/prolog/machine/system_calls.rs

@@ -4235,6 +4235,8 @@ impl MachineState {
                 }
             }
             &SystemClauseType::ReadQueryTerm => {
+                current_input_stream.reset();
+
                 readline::set_prompt(true);
                 let result = self.read_term(current_input_stream.clone(), indices);
                 readline::set_prompt(false);

src/prolog/read.rs

@@ -42,11 +42,6 @@ pub mod readline {
     }
 
     impl ReadlineStream {
-        pub fn new(pending_input: String) -> Self {
-            let rl = Editor::<()>::new();
-            ReadlineStream { rl, pending_input: Cursor::new(pending_input) }
-        }
-
         pub fn input_stream(pending_input: String) -> Stream {
             let mut rl = Editor::<()>::new();
             rl.bind_sequence(KeyPress::Tab, Cmd::Insert(1, "\t".to_string()));