Filter terminal query sequences from input bytes. Returns filtered output. Maintains state for sequences split across calls.

Filter bytes, returning only safe sequences for history.

Write data to the terminal and track Kitty keyboard protocol state

Write data to the pty master, draining child output to stdout when the pty buffer is full. This prevents the classic pty deadlock where both sides blo

Push data to history, filtering out terminal query sequences that would cause the terminal to respond when replayed.

Flush any pending bytes. Call this when done filtering to get any incomplete sequences that should be emitted.

Byte-by-byte input processing with lookback sequence matching. Only used for normal (non-paste, non-alt-screen) input.

Classify an action as whitelist or blacklist. Every variant must be explicitly handled - no wildcards.

Classify control codes - every variant explicitly handled.

Classify CSI sequences - every variant explicitly handled.

Classify escape sequences - every variant explicitly handled.

Classify iTerm proprietary OSC commands.

Classify OSC commands - every variant explicitly handled.

Classify window operations - every variant explicitly handled.

Returns (supported, initial_flags) - if flags > 0, terminal is already in Kitty mode

Check if pending buffer is a device status query (5n or 6n)

Check if an action is safe to include in history.

Check for alt screen transitions without re-feeding VT/history