fixes: flush chars if got io.EOF without '\n' (#58)

operation.go

@@ -97,11 +97,18 @@ func (o *Operation) ioloop() {
 		keepInCompleteMode := false
 		r := o.t.ReadRune()
 		if r == 0 { // io.EOF
+			if o.buf.Len() == 0 {
 				o.buf.Clean()
 				select {
 				case o.errchan <- io.EOF:
 				}
 				break
+			} else {
+				// if stdin got io.EOF and there is something left in buffer,
+				// let's flush them by sending CharEnter.
+				// And we will got io.EOF int next loop.
+				r = CharEnter
+			}
 		}
 		isUpdateHistory := true