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claude-print/notes/bf-gvw.md
jedarden f504fadc07 Close bead bf-gvw: Phase 4 Terminal Emulator complete 
All 9 terminal unit tests pass. TerminalEmu in terminal.rs handles
DA1/DA2/DSR/XTVERSION/WinSize probes with dedup bitmask and split-chunk
accumulation.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
2026-06-08 09:27:56 -04:00

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Phase 4: Terminal Emulator — bf-gvw

Status: Complete

All 9 terminal unit tests pass.

Implementation

src/terminal.rs implements TerminalEmu — a stateful probe scanner that:

  • Accumulates partial CSI sequences across feed() calls using a partial: Vec<u8> buffer
  • Detects and responds to the 5 DEC probes Ink sends at startup:
    • DA1 (ESC[c / ESC[0c) → ESC[?6c
    • DA2 (ESC[>c / ESC[>0c) → ESC[>0;0;0c
    • DSR (ESC[6n) → ESC[1;1R
    • XTVERSION (ESC[>q / ESC[>0q) → ESC P>|claude-print ESC \
    • WinSize (ESC[18t) → ESC[8;<rows>;<cols>t
  • Uses a dedup bitmask (answered: u8) to answer each probe type at most once per session
  • Passes through unknown probes silently with no response and no panic
  • Limits partial buffer to MAX_PROBE_LEN = 32 bytes to prevent unbounded growth

Tests Verified

test da1_responds_with_csi_6c ... ok
test da2_responds_with_secondary_attrs ... ok
test dsr_responds_with_cursor_pos ... ok
test xtversion_responds_with_dcs_string ... ok
test window_size_responds_with_configured_dimensions ... ok
test multiple_probes_in_one_chunk_answered_in_order ... ok
test probe_dedup_da1_answered_only_once ... ok
test unknown_probe_ignored_no_response_no_panic ... ok
test split_chunk_probe_answered_on_second_read ... ok