Space required before bang (#337)

* bang command expands only alone in buffer

* bang command requires space before

src/engine.rs

@@ -1039,7 +1039,13 @@ impl Reedline {
  /// Parses the ! command to replace entries from the history
  fn parse_bang_command(&mut self) -> Option<ReedlineEvent> {
  let buffer = self.editor.get_buffer();
- let (string, index) = parse_selection_char(buffer, &'!');
+ let (remainder, index) = parse_selection_char(buffer, &'!');
+
+ if let Some(last) = remainder.chars().last() {
+ if last != ' ' {
+ return None;
+ }
+ }
 
  if let Some((_, indicator)) = &index {
  if &buffer.trim() != indicator {
@@ -1053,12 +1059,12 @@ impl Reedline {
  .iter_chronologic()
  .rev()
  .next()
- .map(|history| (string.len(), indicator.len(), history.clone()))
+ .map(|history| (remainder.len(), indicator.len(), history.clone()))
  } else {
  self.history
  .iter_chronologic()
  .nth(index)
- .map(|history| (string.len(), indicator.len(), history.clone()))
+ .map(|history| (remainder.len(), indicator.len(), history.clone()))
  }
  });