Surfaced during manual validation: the pmacs-gpu window sits on
'(connecting...)' forever when attaching to a daemon built without
--features crdt. Handshake succeeds (negotiation reports semantic_render
+ crdt_replica as agreed by both sides), but the daemon's
crdt_replica default is cfg!(feature='crdt')=false in that build, so
send_buffer_snapshots() never fires and pmacs-gpu has nothing to
render.
Classified small under rule (iii). The structural answer (should the
daemon return a clearer signal when crdt_replica was negotiated but
isn't actually compiled in?) is genuine but deferred; for session 3
the failure mode is now documented inline at the build-AttachRequest
site so the next user to hit it recognizes the symptom.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
pmacs-gpu now has two run modes:
- no args: hello-world (session-2 behavior preserved)
- --attach <socket>: connect to a pmacs daemon, negotiate
semantic_render + crdt_replica, import BufferSnapshot into a local
loro replica, render the rope text. Live CrdtOp updates apply as
they arrive.
Architecture:
- pmacs-gpu/src/attach.rs (new): UnixStream connect + Hello /
AttachRequest handshake on the main thread; spawns a reader thread
that pumps decoded InstanceMessage frames through the winit
EventLoopProxy as AppEvent::Attach(AttachEvent::Message). Clean EOF
or transport errors surface as AttachEvent::Disconnected. Reader
thread holds the read half of the stream; AttachClient retains the
write half (unused yet — session 4 wires FrontendEvents back).
- pmacs-gpu/src/main.rs: ApplicationHandler<AppEvent> with a
user_event handler that dispatches Message variants. BufferSnapshot
builds a fresh LoroDoc, imports the snapshot bytes, extracts text
via doc.get_text('body').to_string(), and re-shapes the glyphon
buffer. CrdtOp passes the op bytes through doc.import (loro
accepts both shapes), re-extracts text, re-shapes. Other
InstanceMessage variants are intentionally ignored at session 3.
- Font size dropped from 48pt to 16pt now that we may render full
files (the hello-world 48pt was fine for one line, awful for code).
- Initial text is '(connecting...)' in attach mode, 'hello, pmacs' in
hello-world; attach failure falls back to '(attach failed; see
stderr)' so the window still opens.
One small finding logged in attach.rs's connect() doc: AttachRequest's
initial_size field is a CellSize (rows × cols), nominally
TUI-shaped. Sent as a placeholder (24×80) — a structural answer
('what does initial size mean for a pixel frontend?') belongs in its
own protocol thread, not session 3. Classified under rule (iii) as
deferred.
Container id for the loro text container ('body') hardcoded to match
pmacs::crdt::CrdtState — second finding worth pre-recording: the
container name is a wire-adjacent convention that isn't carried on
the wire itself. Both ends have to agree out-of-band. Not blocking
for session 3 but a structural smell for the producer arc. Logged
as deferred (rule iii structural; the answer is probably 'thread the
container id through BufferSnapshot' but it's not session-3 scope).
Gates: cargo fmt, cargo clippy --all-targets -D warnings (whole
workspace) clean; lib 1303 + pmacs-protocol 11 = 1314 unchanged;
m4_acceptance 83; m11_5_semantic_acceptance --features crdt 2.
Manual validation pending — agent environment is headless. User
walks through: start a pmacs daemon, run pmacs-gpu --attach <socket>,
confirm the window renders the daemon's file contents.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Adds the pmacs-gpu binary crate to the workspace. wgpu 29.0 + winit
0.30 + glyphon 0.11 (cosmic-text 0.18 via re-export) + pollster +
env_logger; pmacs-protocol in the dep graph but not consumed yet
(session 3 wires the attach loop).
The binary opens an 800x200 window titled 'pmacs-gpu hello-world',
sets up wgpu against its surface, configures glyphon with the bundled
JetBrains Mono Regular, and renders 'hello, pmacs' once per redraw.
Close button or Escape exits. Resize re-configures the surface and
glyphon viewport. Surface acquisition matches wgpu 29's
CurrentSurfaceTexture enum (success/suboptimal render through; lost/
outdated re-configure; timeout/occluded skip the frame).
Bundled assets: pmacs-gpu/fonts/JetBrainsMono-Regular.ttf (268 KB)
and pmacs-gpu/fonts/OFL.txt. Font shipped as required by the SIL
Open Font License 1.1.
One finding surfaced during the move and absorbed under rule (iii)
of the framing pass (small / no structural change): the design doc
recorded JetBrains Mono as Apache 2.0; the actual license has been
OFL since the family's open-source release. Doc corrected in
docs/pmacs-gpu-design.md.
Gates: cargo fmt + cargo clippy --all-targets -D warnings clean for
the whole workspace; cargo test --lib still 1314 (pmacs main crate
untouched); m4_acceptance 83; m11_5_semantic_acceptance --features
crdt 2.
Visual confirmation pending — agent environment is headless, so
'window opens, text renders' is user-side validation.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Levi Neuwirth