pmacs/CHANGELOG.md

Changelog

All notable changes to this project will be documented in this file.

The format is based on Keep a Changelog, and this project adheres to Semantic Versioning.

[Unreleased]

Added

Semantic-frontend protocol scaffolding (M11.1)

First milestone of the M11 semantic-frontend arc (see docs/semantic-frontend-protocol.md). Wire-format scaffolding only — no producer or consumer yet; mechanically identical to the M10.5 CRDT wire declaration.

• PROTOCOL_VERSION bumped 2 → 3; SUPPORTED_PROTOCOL_VERSIONS now [1, 2, 3]. The slice-membership handshake keeps v0.1/v1.0 binaries connecting to v1.1 binaries unchanged.
• New semantic_render capability bit on FrontendCapabilities, InstanceCapabilities, and NegotiatedCapabilities (#[serde(default)]; instance default false until the M11.2 projection seam lands). negotiate_capabilities AND-combines it and enforces the semantic_render ⇒ crdt_replica dependency (a semantic session is also a text replica) — rejected as a CapabilityMismatch, never silently degraded.
• InstanceMessage gains the SemanticFrame family: StyleSpans, Decorations, InlineAdornments, BlockAdornments, FoldState, ResourceOffer; FrontendEvent gains Viewport. All anchored in byte offsets — the instance never learns a pixel.
• PMACS_INSTANCE_SEMANTIC_RENDER env override mirrors the existing per-capability test overrides.

Semantic projection seam (M11.2)

The first real producer. The instance now projects syntax styling to semantic_render sessions without rasterizing to a cell grid.

• New SemanticRenderState (src/semantic_render.rs), sibling of instance_render::RenderState: reads the same EditorState but emits InstanceMessage::StyleSpans — tree-sitter spans mapped through the active Theme, scoped and clipped to the byte range the frontend declared via FrontendEvent::Viewport. Emits nothing until a viewport is declared; suppresses byte-identical frames (true span-granularity diffing is M11.4).
• StyleSpans.generation is anchored to CrdtState::version_scalar() — the oplog version vector summed to one monotonic non-decreasing scalar, letting a frontend discard styling that predates an edit it already applied optimistically.
• Dispatcher selects the projection per session: a semantic session gets a SemanticRenderState and never CellDelta/grid Cursor (it lays out locally) but still receives CursorByte, BufferSnapshot, CrdtOp, and presence. A grid and a semantic frontend can attach to the same buffer simultaneously. FrontendEvent::Viewport is consumed (routed by authenticated source, like CrdtOp).
• InstanceCapabilities default semantic_render flipped to cfg!(feature = "crdt") — the "M11.2 enables semantic" moment, analogous to the M10.8 Day-4 multi_frontend/crdt_replica flip.

Decorations projection (M11.3)

SemanticRenderState now also projects InstanceMessage::Decorations from the editor state pmacs actually has instance-side:

• Selection — per-window (per-frontend) byte-native state, scoped to the session's active window for the declared buffer and clipped to the viewport. DecorationKind::Selection.
• Diagnostics — the shared DiagnosticStore, keyed by the file URI the LSP glue opened the document under (lsp::path_to_file_uri is now pub(crate), byte-identical to the Lua file_uri_for). LSP (line, col) is converted to a byte range against the buffer source; severity maps to DiagnosticError/Warning/Info/Hint.
• StyleSpans and Decorations suppress unchanged frames independently — a selection move does not force a styling re-send.
• Decorations::SearchMatch/SearchMatchActive/CurrentLine are not emitted: pmacs has no instance-side search-hit store, and current-line is a pure cursor derivation the frontend already owns via CursorByte (emitting it would breach the contract boundary).
• InlineAdornments/BlockAdornments/FoldState remain unproduced by design — pmacs has no inlay-hint/blame/lens/fold/diff source yet. The wire variants exist (M11.1); their producers are wired when those features land. Honest stubs, not fabricated data.

Segment diffing (M11.4)

Coarse whole-payload re-sends replaced with a CellDelta-style diff, lifted from positional cells to byte-anchored ranges.

• StyleSpans/Decorations refined: { buffer_id, generation, full: bool, segments: Vec<…Segment> }. full = true is a resync (frontend discards prior state for the buffer); full = false ships only the dirty byte regions, each StyleSegment / DecorationSegment replacing styling within its range. Bytes in no segment keep prior state; an unchanged span overlapping a dirty range is faithfully reconstructed (segments carry all current items intersecting the range, not only changed ones). Decorations also gains generation for parity with StyleSpans.
• The diff: symmetric difference of the previous/current ordered item sets, changed ranges coalesced into maximal disjoint dirty intervals. First frame and any viewport-region change force full; an unchanged frame ships nothing. Byte offsets cascade on edits, so an incremental frame after an edit dirties [edit, viewport_end) — bounded; no-edit frames (cursor/scroll/selection) stay free.
• ResourceOffer remains an honest stub (no resource-bearing adornment producer exists yet) — same discipline as M11.3.

Semantic frontend↔instance glue (M11.5)

The arc's consumer side and end-to-end coverage. pmacs has no GUI toolkit, so — per the design note's testability strategy — the deliverable is the bounded testable glue, not a GPU renderer.

• New headless SemanticClient (src/semantic_client.rs, crdt- gated): composes the BufferMirror rope replica (M10.10) with a tile-based SemanticModel that reconstructs styling/decorations from the full + dirty-segment deltas (M11.4). Self-contained: no terminal, no pixels. Emits FrontendEvent::Viewport; exposes read-back accessors (text, effective_style_at, decoration_kinds_at, tile ranges). The M11.4 contract (segments carry every current item intersecting their range) makes a tile self-contained, so incremental application is a clean per-tile replacement with edge-clipping, not cross-span surgery.
• tests/m11_5_semantic_acceptance.rs: (a) reconstruction- equivalence — an incrementally-driven client is asserted byte-for- byte identical to a fresh full projection across a scripted viewport/edit/selection sequence including a viewport jump (the golden discipline without a snapshot crate); (b) end-to-end — a real daemon routes StyleSpans/Decorations to a semantic session (after it declares a Viewport) and never to a grid session, and CellDelta vice versa, validating the M11.2 per-session projection through the socket.

This completes the M11 semantic-frontend arc (M11.1–M11.5): wire + capability scaffolding, the instance-side projection seam, decorations, segment diffing, and the consumer-side glue with end-to-end coverage. InlineAdornments/BlockAdornments/FoldState/ ResourceOffer remain honest stubs pending their source features.

1.0.0 --- 2026-05-18

First stable release. Builds on the 0.1.0 preview (M1–M6) with the M7–M10 arc: third-party packages, the universality proof across three shape-distinct workloads, MCP, and multi-frontend CRDT collaboration. Solo development through 1.0; public contributions open from this release.

Added

Third-party package system (M7)

• Package install at user-config and project scope (pmacs.packages.install / install_project) with version / branch / commit pins and a lockfile.
• Per-package environment with exports; require resolution scoped so packages can declare module-level state without cross-package collision.
• Edit intercepts: packages observe and transform buffer mutations; multiple intercepts thread in attach order.
• Audit-lint rule set (the package-trust surface): error/warning/info patterns across environment-escape, fs-mutation, process-spawn, and reach-around classes; runnable locally and in CI.

Filesystem API and bundled packages (M8)

• pmacs.fs.* worker-dispatched surface: read_dir, stat, rename, chmod, remove with M3 supersede chaining on read ops; UTF-8 path constraint surfaced as a structured failure.
• Three shape-distinct bundled packages proving the buffer universality claim: dired (directory listing), magit (section view), outline / outline-aggregate (derived structure views).
• Dev-loop APIs: pmacs.packages.install_local, reload, on_unload.

MCP for package authors (M9)

• Model Context Protocol surface so package authors can expose editor capability to AI assistance over the same protocol-uniform path as the rest of the system (see docs/mcp-for-package-authors.md).

Multi-frontend CRDT collaboration (M10)

• CRDT layer (loro-backed, feature-gated) with an optimistic-apply keystroke path; daemon owns the authoritative replica, frontends mirror it.
• Two laptops attach to one daemon instance, both edit one file, edits converge within a frame; per-frontend undo; presence and per-frontend cursor rendering.
• Convergence verified under simulated network jitter (PMACS_INSTANCE_LATENCY_JITTER_MS); automated synthetic-frontend and doubled-PTY acceptance plus a two-laptop manual checklist.

Pulled-forward v0.2-prerequisite APIs

Planned promotions from V0.2-PREREQUISITES.md, implemented and shipped in 1.0 (the public-API ceiling was raised by operator decision to absorb them):

• pmacs.buffer.from_file, pmacs.buffer.on_removed (with an idempotent :remove() handle; buffer-local keymaps pruned on removal).
• bypass_intercept option on buffer.insert / delete / replace (skips the intercept chain only; undo/dirty/view/CRDT bookkeeping preserved).
• pmacs.fs.watch (polling watcher; :cancel() / :is_cancelled()).
• pmacs.async.yield_to_next_tick (worker-free next-tick yield).
• pmacs.editor.move_to_line (0-based, clamps out of range).
• pmacs.outline.query (cross-package outline structure query).
• Audit-lint rule 16 reach-around-require-field (info).

Changed

• SSH remote attach now carries the wire protocol over the SSH stderr channel by default (previously stdout). On at least one tested environment (OpenSSH_10.3p1), a non-PTY SSH session does not forward a long-lived remote process's stdout until that process exits, while stderr streams in real time; the --daemon-attach bridge is exactly such a process, so a stdout-carried protocol hung indefinitely (the daemon and bridge were correct throughout). The default flip resolves this with no user action required. Override per invocation with PMACS_ATTACH_SSH_PROTOCOL=stdout|stderr (the legacy PMACS_ATTACH_SSH_PROTOCOL_STDERR=0/1 is still honored). Breadth is currently a single environment; the default is a one-line internal switch so it can be revisited without downstream impact.

Fixed

• SSH remote attach no longer fails with a host-side send Hello failed: Broken pipe: the daemon-liveness probe in the --daemon-attach auto-start path was a disposable connect that could consume the daemon's server-speaks-first Hello; the established connection is now reused (regression-tested).

Known limitations

• Per-frontend undo history does not persist across reattach. After a frontend disconnects and reconnects, it is issued a fresh collaboration identity; its pre-disconnect edits remain in the converged document (CRDT state is fully restored) but are no longer reachable by that frontend's undo command — undo only reaches edits made since reconnecting. Workaround: remove unwanted pre-disconnect content by editing it out. Preserving undo history across reconnect is tracked for v0.2 (V0.2-PREREQUISITES.md, Finding 4).
• macOS REPL ctrl-c / exit-marker timing. Two M6.5 REPL acceptance tests (m6_5_ctrl_c_sends_sigint, m6_5_exit_marker_uses_basename_with_leading_newline) time out on macOS CI runners. The core daemon, CRDT, and remote-attach paths — including the Mac-host collaboration scenario — build and pass on macOS (the lib suite is green there); the limitation is confined to bundled-REPL signal/exit-marker timing. Tracked for v0.2.

Project posture

• forbid(unsafe_code) maintained across the crate; syscalls that need unsafe are bridged via /bin/sh / coreutil / binary trampolines or safe nix wrappers.
• Rust toolchain pinned (rust-toolchain.toml, 1.95.0) so local and CI build the same validated compiler; bumped deliberately.
• Cross-flavor CI: every test runs under both luajit and lua54; clippy -D warnings clean on both flavors and the crdt lane; release-only perf-gate jobs.
• Library suite ~1223 tests (non-crdt) / ~1377 (crdt), zero failing on the pinned toolchain, plus per-milestone integration suites through M10.

0.1.0 --- 2026-05-03

First public preview. Solo development through 1.0; public contributions deferred until then.

Added

Editor core (M1)

• Persistent rope with O(log N) insert / delete / slice / snapshot.
• Buffers with chained View trait subscribers and intercept-edit hooks.
• Undo / redo history with edit grouping.
• Atomic file load / save.
• Crossterm-driven TUI; cell-grid renderer abstracted for future GUI.
• Single-buffer text editing as the M1 deliverable: open a file, navigate, edit, undo, save.

Lua and command system (M2)

• Embedded Lua VM (LuaJIT default; Lua 5.4 supported via feature flag; cross-flavor test gates on both).
• pmacs.command.define / invoke / exists; named introspectable commands for every M1 primitive.
• pmacs.keymap.bind with global / mode / buffer scopes; multi-key sequences (e.g., C-x C-s); buffer-scope wins over mode wins over global.
• pmacs.hook with typed kinds: all-must-succeed, first-non-nil, last-write-wins. Built-in hook surface (buffer.before-save, process.after-tick, etc.).
• Minibuffer implemented as a buffer (validates the universality of the buffer abstraction early).
• describe-key / describe-command for self-introspection.

Async, workers, message bus (M3)

• Worker pool with stealable queues; coroutine-based pmacs.async surface for Lua.
• Typed message bus; cancellation tokens that propagate through awaiting coroutines; supersede keys for "newer query cancels older."
• Acceptance test: parallel grep across a directory tree with cancel on new query, p99 cancel under 50 ms.

Language services (M4)

• Tree-sitter highlighting as a worker-pool service; per-buffer parse caches; incremental reparse on edit.
• LSP client (initialize / didOpen / didChange / didSave / completion / hover / definition / formatting / signature / diagnostics) with per-server async coroutines.
• Project indexing service; symbol search across 1M+ symbols completes under a second.

Frontend partition and remote attach (M5)

• Daemon mode (pmacs --daemon) owning buffers, processes, language services as a long-lived instance.
• Typed protocol over framed Unix-socket transport; FrontendCapabilities, Hello, AttachRequest, FrontendEvent, InstanceMessage (CellDelta / Cursor / ModeLine / Bell).
• Cell-delta diffing on the instance side; only changed cells go on the wire.
• SSH transport variant for remote attach; reconnect-on-drop modeled on mosh. Buffers, cursors, and process state preserved across laptop suspend / network drop / SSH server restart.
• Keystroke-to-render p99 ≤ 10 ms over loopback LocalSocket (M5.9c perf gate).

REPL package and ANSI (M6)

• ECMA-48 ANSI parser: SGR (8/16/256/24-bit color, bold, italic, underline variants, strikethrough, reverse), intra-line cursor motion, line-level erase, OSC title-setting, bracketed paste, alt-screen suppression. Recovery rule: skip to end of CSI/OSC structure, drop to ground at next ESC or after 1 KiB, never crash/hang/corrupt.
• PTY-aware process supervisor: raw / canonical line-discipline modes, SIGWINCH delivery on resize, child-exit cleanup, per-generation bounded byte channel (1 MiB / 128 slots) with per-tick coalescing.
• REPL package (builtin/runtime/repl.lua, 691 lines): three-region buffer (history / prompt / input) with read-only enforcement on history; PTY-spawned shells (bash, zsh, fish, lua); buffer-scoped RET (submit) / C-c (SIGINT) / C-d (close stdin or delete-char- forward); exit markers with basenames and symbolic signal names; multi-REPL coexistence with per-handle parser/scrollback/binding state.
• Output backpressure perf gates: sustained ingest ≥ 100 MB/s over 10 s; RSS delta ≤ 200 MB during the run sampled at 100 Hz; cancel response p99 ≤ 100 ms over 100 trials.
• Scrollback management: configurable retention (10000 lines / 16 MiB defaults); single-pass tick-driven truncation removing oldest complete command-output blocks; navigation latency p99 ≤ 16 ms across 10000-line scrollback; search p99 ≤ 100 ms; truncation correctness across 50 events.
• Multi-REPL: three concurrent REPL buffers render and respond independently; supervisor handles multiple PTY children without resource leaks (verified across 10 spawn-close cycles).
• API audit (the v0.1 ship gate): REPL package source 691 lines (46% of 1500-line ceiling); 15 external functions, all through documented pmacs.X.Y namespaces; zero direct Rust core access; zero reach-around patterns. Seven findings classified; one promoted-and-fixed in-audit (supervisor-record leak across spawn-close cycles, closed by restructuring the close path so _on_exit is the single point of teardown including pmacs.process.forget).

Project posture

• forbid(unsafe_code) across the entire crate. Syscalls that need unsafe (e.g., sysconf) are bridged via /bin/sh / coreutil / binary trampolines.
• Cross-flavor CI: every test runs under both luajit and lua54. Perf gates run release-only under dedicated CI jobs (m4-perf-gates, m5-perf-gates, m6-perf-gates).
• 914 lib tests + per-milestone integration suites (m1-acceptance through m6_8, m6_perf, m4-acceptance, m5_5..m5_8, m6_4..m6_7).