Extra 'j' appended stdin but not really present

andy1li · November 5, 2025, 5:58am

Hey @sandipndev, looks like crossterm maps newline (0xA) to Ctrl+J in raw mode:

src/event/sys/unix/parse.rs

6af9116b6


      
                                  event
                              }
                          })
                      }),
                  }
              }
          }
          b'\r' => Ok(Some(InternalEvent::Event(Event::Key(
              KeyCode::Enter.into(),
          )))),
          // Issue #371: \n = 0xA, which is also the keycode for Ctrl+J. The only reason we get
          // newlines as input is because the terminal converts \r into \n for us. When we
          // enter raw mode, we disable that, so \n no longer has any meaning - it's better to
          // use Ctrl+J. Waiting to handle it here means it gets picked up later
          b'\n' if !crate::terminal::sys::is_raw_mode_enabled() => Ok(Some(InternalEvent::Event(
              Event::Key(KeyCode::Enter.into()),
          ))),
          b'\t' => Ok(Some(InternalEvent::Event(Event::Key(KeyCode::Tab.into())))),
          b'\x7F' => Ok(Some(InternalEvent::Event(Event::Key(
              KeyCode::Backspace.into(),
          )))),

github.com/crossterm-rs/crossterm

src/event/sys/unix/parse.rs

6af9116b6


      
          // newlines as input is because the terminal converts \r into \n for us. When we
          // enter raw mode, we disable that, so \n no longer has any meaning - it's better to
          // use Ctrl+J. Waiting to handle it here means it gets picked up later
          b'\n' if !crate::terminal::sys::is_raw_mode_enabled() => Ok(Some(InternalEvent::Event(
              Event::Key(KeyCode::Enter.into()),
          ))),
          b'\t' => Ok(Some(InternalEvent::Event(Event::Key(KeyCode::Tab.into())))),
          b'\x7F' => Ok(Some(InternalEvent::Event(Event::Key(
              KeyCode::Backspace.into(),
          )))),
          c @ b'\x01'..=b'\x1A' => Ok(Some(InternalEvent::Event(Event::Key(KeyEvent::new(
              KeyCode::Char((c - 0x1 + b'a') as char),
              KeyModifiers::CONTROL,
          ))))),
          c @ b'\x1C'..=b'\x1F' => Ok(Some(InternalEvent::Event(Event::Key(KeyEvent::new(
              KeyCode::Char((c - 0x1C + b'4') as char),
              KeyModifiers::CONTROL,
          ))))),
          b'\0' => Ok(Some(InternalEvent::Event(Event::Key(KeyEvent::new(
              KeyCode::Char(' '),
              KeyModifiers::CONTROL,

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Extra 'j' appended stdin but not really present

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