Vterm Stage 3 — the final vterm stage. A semantic frontend can now host a
terminal: the daemon ships complete validated cell grids, and pmacs-gpu
renders them with fixed-cell geometry, its own input path, and no document
projection at all.
Protocol v19 appends three variants after their enums' final v18 members:
InstanceMessage::TerminalFrame (daemon-gated), and FrontendEvent::
TerminalResize / TerminalPointer (frontend-gated). It is the first bump to
gate in both directions, so criterion 28 pins each filter independently and
byte pins on StatuslineSegments and MenuPointer guard the placements.
pmacs-protocol gains src/terminal.rs: the shared row/column/visible-cell/
grapheme/metadata bounds, TerminalProcessState, TerminalSelectionSpan, and
TerminalFrame::validate — the ONE structural policy the daemon runs before
emission and the frontend runs after decode. src/terminal/* re-exports them
so no duplicate type exists, and unicode-width becomes a workspace dependency
so the screen and the validator measure glyph columns with one table. A new
8 MiB aggregate glyph bound keeps the largest legal frame (measured:
13,437,863 bytes) under the unchanged 16 MiB transport cap rather than
widening every connection's allocation ceiling.
The semantic producer suppresses the whole document family for a terminal
buffer while keeping the status band, theme, font, statusline, menu, and
minibuffer, and compares the complete ordered payload rather than
screen_generation — scroll, selection, and process state all change without
advancing it.
Two things the framing did not spell out, both found by the real-daemon
acceptance:
The Viewport gate keys on the authenticated source's ACTIVE buffer, not the
buffer the message names. Viewport also aligns the window to what it
declares, so a stale document viewport in flight when a command opened a
terminal dragged the frontend straight back off it: the window oscillated,
every terminal declaration was refused, and no frame ever arrived, with
nothing logged anywhere.
The producer clears terminal mode on every exit path. The daemon uses that
flag to suppress CursorByte and the presence sweep, so an early return that
left it set kept both suppressed after the frontend returned to a document.
pmacs-gpu/src/terminal.rs is a pure cell-space paint planner, unit-testable
without a GPU. The renderer builds one shaped buffer per text run, so a wide
or cluster glyph's advance can never choose the next column's origin.
Criterion 37 needed a seam rather than a fixture: pmacs-gpu depends only on
pmacs-protocol, so attach::connect's reader sink was generalized and a
--headless-probe mode added. The acceptance drives a real daemon, a real
/bin/sh child, the real attach client, and real composited pixels in one
path — which is how both defects above were found.
Gates: fmt; strict workspace clippy; 1,757 default + 1,933 CRDT library
tests; vterm Stage 1 9/10, Stage 2 4/4, Stage 3 4/5 acceptance
(default/CRDT); statusline 7/8; M4 120; required GPU 127; workspace sweep
2,919 across 83 suites; diff check clean.
Revision 8 of docs/vterm-framing.md was reviewed and approved on the
documentation branch vterm-stage3-framing. Stage 3 is implemented on this
branch, cut from canonical main, rather than stacked on that branch.
The framing locks additive protocol v19 (TerminalFrame, TerminalResize,
TerminalPointer), an 8 MiB aggregate glyph-byte bound under the unchanged
16 MiB transport cap, dual viewport declaration after every semantic
snapshot, authenticated per-view routing, and a fixed-cell native GPU
renderer. Criteria 28-37 are the scope of this branch.
Align the durable handoff with the approved escape-prefix contract, record the performance and lifecycle hardening, update the Stage 2 verification map, and publish exact final gate evidence in the active-work ledger.
Add cross-surface Lua, shared-view, clipboard, authenticated routing,
BEL, resize, and real-host PTY acceptance. Ensure terminal-local keymaps
run before raw child transport and document the criterion-to-test map.
Co-Authored-By: Claude <noreply@anthropic.com>
Carry the reviewed Revision 7 framing onto the Stage 2 implementation branch
as its first commit. The contract defines durable per-view state, authenticated
input authority, TUI composition, strict Lua operations, and acceptance 15-27.
Co-Authored-By: Claude <noreply@anthropic.com>
Synchronize the documentation continuity lane with #126, preserve the parked
work inventory, and record the landed terminal-core state and next sequential
TUI/GPU stages.
Record the control-free cell and SGR mouse hardening, accepted cleanup changes,
remaining DECSTBM/allocation/limit deferrals, behavioral bite, and final gate
counts in framing Revision 5 and project continuity docs.
Record the IND, NEL, RI, TERM, portable-liveness, and tab-stop fixes; make the
line-oriented EOF contract explicit; and list the accepted fidelity,
performance, and lifecycle deferrals.
Update final from-start gates and the clean behavioral bite proof.
Record the Darwin PTY signal-name mismatch found by PR CI, the normalization
commit, and the final from-start green gate sequence with updated test counts.
Record canonical protocol v18 main after #125, mark Arc 4 complete, and pin
the Vterm Stage 1 feature commit and open PR #126 in the delivery records.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
Add compatibility-preserving full-screen ANSI operations, the bounded terminal
screen and input encoders, and a transactional TerminalManager owning one
read-only identity buffer, PTY process, and screen per session.
Drain terminal-owned process events before process.after-tick, retain exact
final output and PID/outcome annotations, reap killed buffers and shutdown
children safely, and enforce buffer-owned read-only checks across ordinary,
host, undo/redo, and CRDT mutation paths.
Cover split parser and grapheme boundaries, screen/reflow/history invariants,
device responses, lifecycle cleanup, and a real adversarial alternate-screen
PTY. Record the fully gated Stage 1 delivery and downstream TUI/GPU contracts.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
Record the chosen C-c escape, resize and exit behavior, additive v19
compatibility, complete-frame wire, unchanged Style, and shared-session
ownership. Specify the Emacs-style PID/outcome line retained after exit.
Define the terminal screen ownership boundary, three-PR delivery,
protocol v19 surface, fixed four-agent roster, and 33 acceptance cases.
No implementation is included; the framing remains pending user review.
Levi Neuwirth