| Commit message (Collapse) | Author | Age |
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A message lingers until input dismisses it, and a detached session with nobody
attached has no input: its messages, and /screen, kept what was said long ago.
The session now marks the core unattended while no client is attached, and
the core drops a pane's messages once the newest has been up MessageLinger on
the clock, checked as it is stepped or served. A pane's older lines go with
its newest rather than each on its own clock; the render pipeline's clock is
the place for that.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
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and restores
A client that wrote Restore saw its connection cut with no answer, and could
not tell a Restore from a crash. The listener now lets the writer's answer out
before the cut, and cuts only the old editor's connections, refusing their
requests meanwhile; a client that dials during it is the new editor's and
stays. Dump logs 'dump <path>' and the restored editor's log 'restore <path>'.
Keeping connections across a Restore was weighed and left: the fids name the
old editor's panes and opens, so it would mean carrying serials and open
records into the new one, where acme's Load only adds windows. tty's Restore
also closed its shells' ptys without reaping them; it retires them now.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
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Kill queued a signal effect for later, so the job it saw running by its marks
could have ended, and another started, before the signal went; and with job
control off the job shares the shell's process group, so the host skipped it
and Kill reported nothing. Kill now calls the host's kill_job while it holds the
turn, and when the only job is the shell's own group says 'Kill: no job to
signal', which also fails a write of Kill to ctl.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
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The detached server closed a pane's pty only when the shell was respawned,
hit EOF or the session shut down, so rmdir, Del or Delcol on a terminal
left its shell running with nobody to read it; the tty front end and
macOS did the same. Retiring a terminal pane now emits a close_pty
effect, which each host that runs shells answers by hanging the pty up
and ending the shell (the detached server's and the GUI's existing
retire-and-reap path, and a close plus SIGHUP in the tty and macOS
shells).
Co-Authored-By: Claude Opus 5.5 <[email protected]>
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acme keeps what edits a text in its Text (dat.h:171-190) and the window
holds a body and a tag of that type. The cursor, the selections, the modal
state and the edit-buffer undo move off Pane into Text.zig, Pane holds
them as its body, and the edit and normal-mode operations take the Text
they edit. Nothing changes in behaviour; this is the step that lets the
tag become a second Text.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
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Not a pure move: state moves. Pardes's `pipe_seq` and `pipe_wait` become
Pipe.zig's own fields `seq` and `wait`, and Pardes embeds one as
`pipe: Pipe = .{}`. pipeRequest reads only the request in flight, so it now
takes `pipe: *const Pipe` and the four shells call
`core.pipe.pipeRequest(id)` (their Pipe imports go away again); the other
pipe functions still need the panes and keep `p: *Pardes`, writing
`p.pipe.seq/wait`. Field reads in dump.zig, the shells' tests and two test
files follow (`core.pipe_wait` becomes `core.pipe.wait`). No behaviour
change.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
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Pure move, no behaviour change: the editor half of `|` that the earlier
change put at the end of selection_pipe.zig (PendingPipe, pipeMarker,
submitPipe, pipeRequest, pipeFailed, pipeCut, pipeOutput, pipeResponse,
and the eight pipe tests with nextPipeEffect) now lives in its own
Pipe.zig, so the pipe's editor state can become Pipe's own fields next.
selection_pipe.zig goes back to exactly what it was before this series: the
native runner and the boundary values the shells hand to their workers.
The moved code names the runner's types as `selection_pipe.X` again, as it
did in pardes.zig; callers change from `selection_pipe.submitPipe(p, ..)`
to `Pipe.submitPipe(p, ..)` (pardes.zig and the four shells).
Co-Authored-By: Claude Opus 5.5 <[email protected]>
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Pure move, no behaviour change (acme keeps dump and load in rows.c):
dumpState, restore, initFromDump and initDump go verbatim to the end of
dump.zig, after the dump format they read and write. Inside dump.zig the
moved code's `dump.` prefix drops, so `Pane` there is the dump record; the
one editor pane it names is spelled `pardes.panes.Pane`, and its other
`panes.X` references become `pardes.panes.X` because dump.zig's own tests
use `panes` as a local name.
The methods become free functions taking `p: *Pardes`: `p.dumpState()`
becomes `dump.dumpState(p)`, `core.restore(bytes)` becomes
`dump.restore(core, bytes)` and `Pardes.initFromDump(..)` becomes
`dump.initFromDump(..)`, in pardes.zig, the shells, layout.zig,
Terminal.zig, builtins.zig and the tests (38 receiver rewrites plus the
initFromDump calls). The tag-tail restore helpers stay with the tag code.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
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Pure move, no behaviour change: the Message stamp helpers, LoggedMessage,
setStatus, setMessage, showMessage, dismissMessage, dismissLine,
advanceMessages, advanceLine, messagesAnimating, MessageMotion,
messageFrames, messageMotion, noticeText, noticeLife, blendRgb,
logMessage, messageLog, reportError, the notice painters (leaderText,
noticeCols, Printed, printRight), collectNotices, and the six message
tests go verbatim to Messages.zig.
The methods become free functions taking `p: *Pardes`. setStatus,
setMessage and reportError are called from ~170 places as `p.setMessage(..)`,
so Pardes keeps three declaration aliases (`pub const setMessage =
Messages.setMessage;`) and those call sites stay as they are; every other
call changes from `p.x(..)` to `Messages.x(p, ..)` (46 of them). The five
shells' `pardes.Pardes.Message` become `pardes.Messages.Message`. The
message ring's fields stay on Pardes for now; moving them into Messages is
a separate change.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
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Pure move, no behaviour change: submitPipe, pipeRequest, pipeFailed,
pipeCut, pipeOutput and pipeResponse, the PendingPipe they share,
pipeMarker, and the eight pipe tests with their nextPipeEffect helper go
verbatim to the end of selection_pipe.zig, so the whole of `|` (runner,
boundary values, prompt, request and atomic edit) is one file. Inside that
file the `selection_pipe.` prefix drops; the file doc now says it holds both
halves.
The methods become free functions taking `p: *Pardes`: the four shells'
`core.pipeRequest(id)` become `selection_pipe.pipeRequest(core, id)`, and
pardes.zig's two calls change the same way. pushUndo becomes pub because
the pipe's edit calls it; PendingPipe.deinit becomes pub for Pardes.deinit.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
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messages
PDF highlights (hover preview, search, selection) are baked into page rasters,
and any change re-rendered the whole page with MuPDF; the TTY then re-sent it
as base64 (4.7 MB a page), the GUI as a new texture. Worse, a pointer motion
over a PDF invalidated the page even when no preview was shown, so every
motion paid that. Now:
- A raster whose baked highlight set equals the wanted one is left alone.
- A highlighted page keeps its clean rows (before highlights and tint); a
change repaints only the rows of quads that differ, running MuPDF's
highlight pass (pardes_pdf_paint_highlights) over those clean rows and
tinting them: the operations a full render performs, so the pixels are
identical. MuPDF band renders are NOT bit-identical to a whole page (edge
rows, resampled images), so they are never used to patch; the comment
claiming otherwise is corrected.
- ImagePlace.patch hands shells the changed rows; the GUI uploads just those
rows into the texture it holds.
- The TTY probes kitty shared memory (t=s) with an id vaxis never reaches and
sends rasters as a /dev/shm name when the terminal reads it; direct base64
otherwise (ssh).
- Shells that take row patches (GUI, TTY with shm) repaint a selection while
it is dragged instead of only on release.
Latency elsewhere:
- TTY: an animating frame no longer sleeps 16 ms blind; a tick thread posts
into the input queue, so input inside the frame is handled at once.
- TTY and GUI: queued pointer motions coalesce to the last.
- GUI: a skipped swapchain image re-arms the frame (3 retries); animations
still tick while nothing presents.
- Editing: the line index is carried across an edit instead of rebuilt from
a scan of the whole file per keystroke.
Messages fall into their row (ease-in; the GUI slides the band out from under
the tagline, a terminal fades it), stay until the next input as before, linger
MessageLinger ms (default 800), and dissolve (ease-out). MessageAnimation
toggles it; both are settings, in Config and startup files. The snapshot
harness pins the old behaviour. The detached server now ticks animations.
A restored terminal comes back live: the old screen and scrollback (dumped
as clean VT by ghostty's formatter, replayed at the new size; older dumps
fall back to their rendered text), a dim
"restored history" marker, then a new shell in the directory it was in.
Right-click on a line number in a file pane looks at that line (a sticky
context header's number included).
Measured with an external pty driver (TTY), an in-process fence trace
(GUI, PARDES_TEST_LATENCY), and test/pdf_pointer_bench.zig (pixel identity
against the baseline and a whole-page oracle); balanced A/A/B rounds, paired
per-round statistics.
Messages stack: each event gets its own row and its own fall, linger and
dissolve; a line keeps its row until it leaves and a new one fills the first
free row. Announcements and statuses are replaced in place, not stacked.
MessageFall, MessageDissolve and DumpDir are settings Config reports.
Co-Authored-By: Claude Opus 5.5 (1M context) <[email protected]>
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The editor's loop was the only thing that could answer a 9P request, which
made the editor's own syscalls through a mount of its own tree -- a Look at
/mnt/9p/pardes/<me>/anything under a `9ns --mntgen` view, a Save into it --
requests only the blocked loop could serve. The name-based refusal that
followed (ownMountSuffix) and the in-process routing of a mount of oneself
(Client.sameSession) were patches over that, and both are gone, with the
mailbox that shipped every request to the editor's thread.
One rule replaces them, `pardes.turn`: the core is single-threaded, the
editor's thread has the turn by default and gives it up in two kinds of gap
-- while it waits for input and while a step of it is out in a host syscall
-- and a cloud9 connection task takes it in those gaps to answer. `out`
counts the steps that are out, from any thread: while one is, the core reads
consistently but that step still holds pointers into it, so a request that
would change a pane (a write, a truncation, an rmdir) is parked in the
engine and retried when the turn is next given up with nothing out, and the
editor's own wake waits for the count to reach zero. It is never a write of
its own that a step waits on out there -- writes come from a shell
performing a save between steps -- so a parked request is never the
syscall's own, and making a pane or rendering a screen need not park:
every yield sits before its step's mutation, so the layout and the surface
are whole under it. A changing request that queued effects is answered
once the editor has performed them (`echo Save > exec` returns with the
file written, as acme's `put` does), and it settles the way a step does,
because without that a /log reader waited for the user's next keystroke.
Every host syscall on a user path has to give the turn up, not fs.zig's
alone: the first end-to-end run hung in `inotify_add_watch` performing the
new pane's watch effect. PDFs and images are read whole at open, so no
draw goes out into the host. The core's allocator takes its fixed buffer
through the lock-free interface, since a connection task allocates while
the editor's thread is out in a syscall that allocates too. A Restore puts
the replacement in first and releases every task waiting on the old core.
cloud9 (pinned at eb1a104) parks an open, a truncating wstat, a clunk and a
remove on `again`, not only reads and writes, and answers a parked job
whose fid was clunked without asking the backend.
Verified: test/selfmount.py runs the editor under `9ns --mntgen` and
Looks at, reads and Saves its own tree through the mount; a unit test pins
that a change parks while the editor is out mid-step and lands when it
rests, while a read is answered in the window. 9P over the Unix socket
against a tty session, same machine, Debug builds: a read of /index 278us
-> 61us, a truncating body write 1184us -> 609us, exec Save 718us -> 583us;
the gesture benchmark is unchanged (geometric mean 0.997 over 53 cells).
Also from the reviews: a notice chip over an image or PDF pane was painted
out by the picture drawn after the cells, so pictures give up the rows; in
the GUI a tree-sitter context band painted over the chip, so body layers
are emitted first; a message is one row of printable text, its 256-byte
cut never leaves half a glyph, and one wider than its pane keeps its tail
(the file name, the reason) rather than its head.
Co-Authored-By: Claude Fable 5.1 <[email protected]>
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The hand-written poll loop for Unix/TCP listeners is replaced by
cloud9.serve.Runner; requests are queued to the editor thread, which answers
them under the connection lock on each frame and retries parked reads as
before. QUIC keeps the poll path (its adapter is fd based). The detached
server no longer loses a wake that lands between frames. The firmware path
keeps driving the engine with push/step. cloud9 re-pinned.
Co-Authored-By: Claude Fable 5.1 <[email protected]>
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Consolidate pane, layout, memory and host code. Serve 9P by default over Unix sockets, with runtime mounts and optional TCP/QUIC transports. Remove FUSE and obsolete proof-of-concept examples.
Fix highlighting and terminal-history performance, expand differential and stress-test infrastructure, sort navigation results while preserving the next occurrence, add syntax-colored Braille minimaps, remove SPC-k, and document 9P interaction as a repository skill.
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A review of what this program does when the environment says no. The finding
that reframes it: there were almost NO panics on ordinary paths — the rule
already held — but there was a great deal of silence, and one case worse than
any panic.
SILENT DATA LOSS ON SAVE. `saveFile` marked the pane saved the moment it
QUEUED the effect, before any host had tried; `host_io.writeFd` returned void,
so a short or failed write was indistinguishable from a complete one; and
`writeFileBytes` returned true regardless. A save to a read-only file, or into
a directory removed under the pane, therefore cleared the tag's ` *` and posted
nothing — and `Del` makes no dirty check, so the next click threw the edits
away with the screen saying they were safe. On a full disk it was worse: the
file is already `O_TRUNC`'d when `write` fails, so the message row said `saved`
over a file that had just been emptied.
Now: `writeFd` reports, `writeFileBytes` returns WHY (`PermissionDenied`,
`NoSpaceLeft`, `ReadOnlyFilesystem`, …) including a failed `close`, which is
where write-back filesystems report at all; the core marks the pane saved
around `perform` rather than at emit, which is also where the bytes are read;
and a host that could not write calls `Pardes.saveFailed`, which puts the
reason on the message row and takes the clean mark back. That is a CALL and
not a return value because host.zig enforces, at comptime, that a `push_`
method reaching every host in a fan-out cannot have one answer — the first
attempt at this changed the signature and the compiler was right to refuse it.
TWO PANICS ON AN ORDINARY KEYSTROKE, in look.zig's number scans. `v = v * 10 +
d` over caller-supplied digits, reached from `parsePathLine` and the `@pN` scan
— which every Look, every right-click and every n/N motion runs on whatever
word is under the pointer. A hash in a log, a CSV column, any output shaped
`foo:99999999999999999999`, and the editor died with "integer overflow". Both
saturate now, the same way acmefs.zig's address parser already did; a saturated
line is refused by `file_pane.open`'s `line <= total` and a saturated pane id
by `focusPaneLine`'s `id < MAX_PANES`, so nothing addressable changes.
A BOOT FILE THAT WILL NOT OPEN joins the missing-name case in the `+Errors`
pane instead of taking the launch down: `pardes /root` resolves as a `.file`,
could not be read, and left `error: PermissionDenied` and a return trace.
`look.readFile` now says which errno it was, so the pane can say "permission
denied" rather than a word from the source code.
The tag-marker test drained no effects and passed anyway, which is exactly the
defect; it drains now.
Co-Authored-By: Claude Opus 5 (1M context) <[email protected]>
Claude-Session: https://claude.ai/code/session_016Q4RATpafkwahrovHQLKRf
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bugs go with them
Nine read-only scouts compared every host-side concern across `src/macos.zig`,
`src/tty/tty.zig`, `src/gui/gui.zig` and `src/detached/server.zig`. What they
found was not a style problem: each duplicated body had drifted, and in every
case the drift WAS a bug the users of that shell could see. So the fixes and
the deduplication are the same change.
**One PATH, adopted before the first fork.** LaunchServices hands a bundle
launchd's environment, whose `PATH` is `/usr/bin:/bin:/usr/sbin:/sbin`. Every
pty shell, `|` filter and language server the app forked inherited it, so
`yazi` in `/opt/homebrew/bin` was absent from a Dock launch and present in the
identical binary run from a terminal — the "it worked briefly" window was
simply the sessions started from a shell. `shell_bin.adoptSystemPath` composes
`/etc/paths` then `/etc/paths.d/*` in the order `path_helper` reads them,
deduplicating on first occurrence, and runs once at startup in all four native
hosts. It APPENDS: an entry already present keeps its position, so running it
over a real session cannot demote a mise shim behind `/usr/bin` and silently
change which `node` runs. A `PATH` that was configured is left byte-for-byte
alone; only one nobody configured is repaired. `prepareForFork` folds that
adoption together with the prompt-rc staging and the `BASH_SILENCE_DEPRECATION_WARNING`
setenv the five hand-copied prefork sites had between them — `server.zig` had
none of it, which is why every detached pane opened with Apple's zsh banner.
**The LSP protocol client never worked on macOS.** It opened its control
socket with `libc.SOCK.CLOEXEC`; Zig defines that constant for Linux and
Darwin answers `socketpair` with `EPROTONOSUPPORT`, so the call failed before
any fork, `ensure` returned `error.NoServer`, and every row in the spec table
— rust-analyzer, clangd, gopls — was unreachable in every macOS build. The
in-process ZLS backend kept answering, which is what made it read as "only Zig
is supported". It is a plain socket plus `fcntl(FD_CLOEXEC)` now, the route
`fuse.zig:943` and `nested.zig:95` already took for the same reason. The
snapshot suite that covered this path had never run natively on a Mac: the
harness targets defaulted to x86_64-linux.
**One LSP host worker.** `src/lsp_host.zig` is the snapshot, the worker body
and the job lifetime that `tty.zig` and `gui.zig` carried verbatim — `gui.zig`
said so in a comment — and that `macos.zig` did not carry at all: `lsp` and
`pipe` were absent from its `Host.VTable`, so the core answered its own empty
answer, `SPC l i` rendered a blank panel and a `|` filter silently did
nothing. All three shells share the module, and the AppKit host implements
both effects. Its status sink is now REGISTERED as well as defined, so
unsolicited server news reaches the message row instead of nowhere.
**The animation clock measures time.** `pardes_animation_tick` advanced one
scene frame per callback and published `frame_count / 60`, so scene time was a
count of callbacks rather than elapsed seconds — and `AppDelegate` re-armed
`asyncAfter(.now() + 0.016)` only after the previous frame's work had
finished, making the true period 16 ms plus all of it. Motion ran at about
three quarters of wall clock and unevenly. The tick now spends measured
monotonic time in whole `frame_ns` steps and banks the remainder, so a late
callback advances two frames instead of stretching one; `spendTickTime` is
that arithmetic as a pure function with its own tests and no display attached.
On macOS 14+ the animating run is one `CADisplayLink` phase-locked to vsync
rather than a chain rebuilt after every frame; macOS 13 keeps the old chain.
**Three more single definitions.** `panel_animation.paintOrder` is the
moving-then-opening-then-closing composite order as a rule the core applies
once in `Pardes.render` — `macos.zig` was re-sorting an already-sorted list.
`selection_pipe.Tasks` is the bounded in-flight pipe table `tty.zig` and
`gui.zig` each declared. `boxContains` was a fourth copy of the half-open cell
test and is now an alias of `Box.contains`.
**A filtered terminal stops asking libm per cell.** `Filter`'s legibility
stage called `RGB.contrast` for every painted cell, and that ends in
`std.math.pow` up to six times, re-deriving a ratio against a background that
had not moved; the existing memo cache covered the palette reduction beside it
and never this. The indexed path's input is a `u8`, so all 256 answers are
enumerated once per pass — after the default roles are fixed, before the first
cell is read — and what a cell names becomes an array index. Only truecolour
still reduces. ReleaseFast, 190x56, Tracy: recolour 3.09 ms -> 0.130 ms,
frame 3.37 ms -> 0.299 ms. The comptime luminance table is pinned to
`RGB.luminance` and `RGB.contrast` by exact-equality test over every channel
value and all 65 536 palette pairs, because the decision is a threshold
comparison where one ULP is a different colour. A `filterInit` Tracy zone
records the part that is still per-pass: 2.9 us warm against a 117 us pass,
which is the measurement that says not to cache it across frames.
Released as 0.0.2. `build.zig.zon` carries the version into `pardes --version`
and into the `Changelog` pane through `@embedFile`, so the entries above open a
`## 0.0.2` section and `## 0.0.1` closes with the tagline work of the parent
commit.
Two bugs here were mine, caught by review rather than by me: a double free in
the macOS pipe drain arm (`Msg.free` already owns the response) that segfaulted
the app on the first `|`, and a proposed `getRowAndCell` optimisation that
targeted 2 of 43 draw samples while the contrast math beside it took 12 — and
would not have compiled. The profile that justified it was a Debug build, which
`build.zig:1160` already documents as ~5x slower than release.
Native and -Dplatform=macos suites: 0 failures. All targets build with Tracy on
and off; the shipped release binary contains no `___tracy_emit_zone_begin`.
App reinstalled, signature verified, dmg regenerated, launched with 0 crash
reports; installed binaries verified byte-identical to a fresh build.
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effects that compile
Three things this shell had its own copy of, and in each case the fix is that
it stops having one.
**The tagline band.** A pane tag draws at `gui_tagline_font_percent` of the
body face and the band it sits on shrinks with it, while the grid row stays
body-sized — so something has to decide where the shorter band sits in the
taller row. This shell decided by centring, always, which is precisely the case
`config.gui_topbar_pane_border_px` exists to prevent: the topbar's unused
half-band meets the first pane tag's unused half-band and the window background
shows through the seam. The strip is as wide as the bands are short — on a
20-pixel cell, 4 physical pixels at the default 82%, 10 at 50%, 14 at 30% — so
it grew as the tagline face shrank and read as "the tagline is wrong on the mac"
rather than as one missing rule. The rule is `pardes.taglineBandOffset` in the
core now and both pixel hosts call it: row zero bottom-aligned, the first
pane-tag row top-aligned, the two joined by `gui_topbar_pane_border_px` in the
theme's scrollbar-track colour, every row between centred, and a `Tagbottom`
band on the final row flush with the window edge — with the sub-cell strip
beneath it painted in that band's own colour, because the core grid holds only
whole cells and a window is any height it likes. `pardes_tagline_band_offset`,
`pardes_topbar_pane_border_px` and `pardes_topbar_pane_border_rgb` carry it over
the C ABI as PHYSICAL pixels: the host multiplies its points by the backing
scale going in and divides coming out, which is the snapping `Metrics` already
does for the cell, and is what keeps a one-pixel rule one pixel instead of a
two-pixel smear.
**The watch.** `file_watch.zig` was one mark/reconcile transaction over
`inotify`, so the tty shell, the SDL window and the detached daemon all watched
nothing off Linux: an edit made outside pardes never reached the pane, and a PDF
replaced on disk kept rendering the old inode. It is the same transaction over
two kernels now — `init`, `wait`, `stop`, `drain`, `markDir` and `unmarkDir` are
still the whole of it, and the hosts wait on a kqueue and poll it exactly as
they did the old descriptor. A macOS mark is TWO filters, because a kqueue
directory filter reports its entries changing and never a write to a file
already inside it: the parent mark follows rename-over saves, `markFile` catches
in-place writes, and `remarkFile` re-arms the file filter once a rename has moved
the inode. That is the same pair the AppKit host's DispatchSources already used
for the same reason. Directory marks are deduplicated here by device and inode,
because each `EVFILT_VNODE` filter needs a descriptor of its own and inotify did
that deduplication itself; `stop` and `drain` wake through the one `EVFILT_USER`
filter, since a kqueue cannot simply be read the way an inotify descriptor can.
**The effects.** The three `crt.ci.metal` entry points are
`extern "C" [[stitchable]]`. `CIKernel.kernels(withMetalString:)` compiles that
source at runtime, looks for stitchable functions, and rejects the WHOLE source
with "cannot find a valid stitchable Metal function in the source" when it finds
none — so `ScenePostprocessor.init?` returned nil and every scene effect and
panel transition silently degraded to the plain CoreText draw. The
`effect_sources.zig` test pins the exact spelling of all three, and
`draw-effect` in the e2e suite catches the degradation rather than the spelling.
Beside them, the offscreen harness owes the core a PRESENTATION. Its window is
borderless and never ordered front, so AppKit runs no display cycle and
`pardes_frame_presented` — whose only caller is `draw(_:)` — never fired. The
core holds pointer gestures inert while a layout mutation has not reached a
backend, which for an unpresenting harness is the rest of the script: the first
pane a script opened silently killed every later click, drag and Look. So
`readFrame` presents what it just rendered, into a bitmap nobody reads.
`PARDES_CHROME` also looks under `/Applications`, where a browser's executable
lives inside an application bundle and never on `PATH`. The macOS goldens are
regenerated; docs/macos.md, config.md, detached.md, web.md and the design PDF
follow.
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Step 5 of the 9P chain (docs/9p.typ 12.5, docs/registry.typ 9P-22, 9P-11, BOARD-1).
THE CLIENT. `Client` in src/9p.zig is the mirror of `Server` and the same shape:
sans-io, no allocator, no threads, no descriptor, caller-owned buffers, and it
builds freestanding. 152 bytes of struct against the server's 9,488, because a
client owns neither a fid table nor a park table -- the far end does.
The API is submit / push+output+wrote / take. Completion is a PULL: a callback
would fire inside push, inside the transport's read, inside the host's poll
dispatch, which is exactly where fs9_service says filesystem work must not
happen. `take()` returns the next completed operation or null, which is
`Server.next()`'s loop-until-null contract read from the other side. Tags are a
fixed 16-entry table indexed BY the tag, so an out-of-order reply -- which 9P
allows and both reference clients rely on -- costs one bounds check. The reply's
TYPE is checked against the request's op, because a tag is only as good as the
table behind it. A `Done` borrows the input buffer and is valid until the next
call; `take()` releases the previous frame on entry, so the rule is mechanical
rather than remembered, and read data and error strings are zero-copy.
And one real caller, so this is not a library with no user: the `9p` word takes
a dial and a path, walks another instance's tree, and opens the bytes in a pane
like any other `Look`.
THE BOARD. A SECOND image, not a second role: the console runtime keeps UART0
bidirectionally and is behaviourally untouched. On the new one the UART carries
9P AND NOTHING ELSE -- no ANSI, no vaxis, no allocator, no heap module. The loop
is uart.read -> push / retry+next -> handle -> reply / output -> writeSome ->
wrote. `writeSome` is new and additive: `write`'s bounded spin DROPS bytes on a
stalled transmitter, which on a protocol stream truncates a reply mid-message
and desynchronises for good, where a short count cannot. BOARD-1's one divider
write raises the line to 921600.
88,000 B text, 49,424 B bss, an 88,080-byte image -- 5.7% of the 1,536,000 B
partition, against the console image's 809,536 B.
THE COMPTIME BRIDGE, which is the part worth reading. `board9p.caps` is the ONLY
place the GPIO tree is described; node ids, parents, names, permissions,
handlers, buffer size and the per-pin directories are all derived from it, and
`fan.dirs` makes `gpio/<n>/value` one table entry serving eleven pins. Modes are
derived from which handlers a file has rather than declared. A second capability
is a table entry, not new tree code.
JP1 became a real table in the new leaf `src/board_pins.zig`, with the ASCII
drawing RENDERED from it at comptime and the pin list COLLECTED from it -- the
9P image links no core and so cannot import board_memory.zig, and copying the
table was not acceptable. A golden test pins the drawing byte for byte, the
console's own shape test still passes, and the identical bytes are present in
all three artifacts.
PROVED. Two daemons: B read A's `/1/body` through the `9p` word into a pane,
byte-identical to plan9port's `9p read` of the same path. Both board images
build. No hardware was attached, so nothing about the board is claimed beyond
what builds and what the host tests cover.
zig build unit-test 585/585. fs-bench unchanged and still zero allocations on
every read row.
---
REVIEW FIXES FOLDED IN. Steps 3, 4 and 5 were verified on the happy path and
then adversarially reviewed by three agents; eight defects, six fixed here, five
of them reproduced with measurements before and after. Full writeup in
docs/registry.typ `9P-27`. In brief:
* a remote crash of the WHOLE daemon: one `size[4]` of zero plus one byte hit
`unreachable` in `fs9_service.fill`. Also 99.7% of a core when the stuck
buffer made `room == 0` return without reading. Now `srv.dead` is a hangup,
checked before the room guard.
* the editor froze 177 s on a dial: `connect(2)` ran on a still-BLOCKING
socket before the deadline existed, and a full accept backlog waits forever.
Now non-blocking with the wait spent against the budget. After: 2.03 s.
* a 64 KiB pty read is exactly `queue_cap` and wiped every unread byte AND
dropped itself. `notePtyOutput` splits at half the cap. Deterministic.
* four silent sockets denied `--fs9` forever; connections now expire on the
same five-second rule the frontend transport already had.
* EMFILE spun a core; the listener pauses and leaves the poll set, as the
frontend listener does.
* `max_fids = 32` made `find` over `9pfuse` fail with 57 consecutive
`Rerror`s -- refuting this step's own acceptance clause. 256 for a host,
`board_fids` 32 for the microcontroller.
Found clean and worth recording: `sig` reaches the foreground process group; the
two-namespace pty lookup is right over both transports; `PaneFile`'s u4 wall is
guarded; reader counts release on every abrupt-death path; `fs_origin` routing
and the reply arithmetic hold under probing.
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Step 4 of the 9P chain (docs/9p.typ 12.4, docs/registry.typ 9P-15/16/17/4/5).
src/9p.zig is a base 9P2000 codec and a SANS-IO server: it never touches a
descriptor, takes no allocator, starts no thread, and builds for
wasm32-freestanding and riscv32-freestanding. That is what lets the same code
serve a unix socket here and a UART on the board later.
Server(comptime fs: type) duck-typed on fs.Req/fs.Reply/fs.Reply.Attr, so it
never imports acmefs and acmefs never learns 9P
init{ in, out, root } the caller owns the buffers; msize is derived
retry/next/reply the three fs_service.Transport ops, by name
push/output/wrote/hangup bytes in, bytes out, partial writes supported
next() is a PUMP, not one-message-one-request: a 3-element Twalk is three
lookups, Topen|OTRUNC is a setattr then an open, Tversion is none at all.
Decisions that were open and are now taken, each recorded in the file:
* qid.version is ALWAYS 0, which makes Linux set P9L_DIRECT and skip its
cache -- the 9P equivalent of the FOPEN_DIRECT_IO fuse.zig relies on.
* Every Rread is clamped to the client's count. An over-long one is a hard
-EIO in Linux, not a truncation.
* Rerror carries Linux's exact strerror text (registry 9P-4 option A), so a
mount recovers the errno instead of ESERVERFAULT. Asserted as literals,
because a typo there is 'Unknown error 526' on every mount.
* `.` and `..` are resolved BY THE SERVER. Under FUSE the kernel does it
and acmefs says so; 9P has no kernel, and forwarding `..` as a lookup
would break every client that normalises a path.
* Topen checks the perm bits itself. Under FUSE the kernel enforced them;
over 9P nobody is above the server, and `errors` would have been readable.
* Tcreate and Tremove are Rerror: `new/` creates a pane on WALK, so the
capability exists and is not spelled Tcreate.
THE INTEGRATION BUG, which was not in the protocol: the daemon's push_fs_reply
sent every reply to the FUSE mount, whose park table has no 9P tag, so it
dropped it -- Tversion worked (no core involved) and Tattach hung forever. That
is exactly the 'no routing origin for the 9P descriptor' cell in the layering
table of docs/9p.typ. Session.fs_origin now carries the transport that asked.
Proved with plan9port against a live daemon serving BOTH transports at once:
9p ls / and /1, read index/ctl/tag, write /1/body, stat, a walk through
/1/../index, pane creation through `new/body`, and the two refusals arriving as
strings -- 'permission denied' and 'No such file or directory' -- confirmed on
the raw wire as Rerror text rather than numbers. A write over 9P reads back
through FUSE and a write through FUSE reads back over 9P.
msize 8192, 34,072 bytes per connection (Server 9,488 + in 8,192 + out 16,384,
out being two msize so that every reply is infallible), four connections.
zig build unit-test: 468 tests before, 503 after.
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Review fixes to steps 1 and 2, found by an adversarial pass over the committed
chain. One is a real bug and the rest are comments that were false.
THE BUG. `waitInput` put the FUSE descriptor in the poll set whenever the mount
existed, and the `.fuse` arm ignored every revent. Linux's `fuse_dev_poll`
answers EPOLLERR once the connection is gone, and POSIX reports POLLERR whatever
the events mask asked for -- so an external `fusermount3 -u`, a sysfs abort, or
systemd taking /run/user/$UID away at final logout (exactly when a detached
session is supposed to keep running) made poll(2) return instantly, forever. The
daemon then spun the whole pump at 100% of a core for the rest of its life, and
re-offered every parked slot to the core at that rate.
Measured on the unfixed commit: 0 CPU ticks over 10 s idle, then 1000 ticks over
the next 10 s after unmounting its own mount point. Measured after the fix: 0
ticks over 8 s in the same scenario, process alive and in state S.
fuse.zig's own poll thread has carried the equivalent guard all along, which is
why the desktop shells never showed this and the daemon did.
THE COMMENTS, each checkable and each wrong:
* `Source.fuse` said the drain is not done in `dispatch` to avoid re-entering
the core. Both `pull_wait_input` and `push_poll_frame` are called from
inside `pump`, so either re-enters. The real reason is that `dispatch` is
mid-iteration over a SNAPSHOT of the descriptors, and one `push_spawn`
replaces a pane's master under it.
* `fuse.zig`'s new import said "no cycle". There is a cycle: fs_service
imports fuse.zig back and still names `*Fs` in three signatures.
* `Transport`'s rationale said tty.zig and gui.zig store one in a struct
field. Neither does; all four call sites build it inline.
* `deinit` justified its ordering against "as long as the harvest takes".
`harvest` is waitpid(WNOHANG) and blocks for nothing. The real reason to go
first is that aborting the connection wakes a parked reader while its own
shell is still alive to run its exit path.
* `harvest` claimed pane shells are the only children this process forks.
Since step 1 it also forks `fusermount3`, three times over -- reaped by its
own spawner, so the conclusion holds and the premise did not.
* docs/detached.md, docs/lsp.md and docs/design.typ still said the daemon
implements sixteen of twenty-one methods and mounts no /dev/fuse.
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Step 3 of the 9P chain (docs/9p.typ 12.3, docs/registry.typ 9P-8). Nothing here
is about 9P: it lands in the FUSE-served tree and any later transport inherits it.
A script could write into a terminal that already existed and read its rendered
scrollback. It could not START one, RESIZE one or SIGNAL one. Two of those were
already effects the core emits, so `exec` and `winsize` are existing
capabilities acquiring a name; only `sig` is new, and it brings the one new
host method, `push_pty_signal`.
pty/ctl winsize <cols> <rows> | sig INT|TERM|HUP|QUIT|KILL | exec
one verb per line, validate-all then apply-all, EINVAL applies
nothing -- `writeCtl`'s shape and `writeCtl`'s reason
pty/status cols, rows, tty-taken as three %11d fields
pty/data write is input to the process; read is the RAW output stream,
gated on a reader count so a pane nobody reads costs one branch
A pane that is not a terminal has no pty/ at all: the lookup is ENOENT and
readdir does not list it.
`PaneFile` is an enum(u4) and this takes it from 11 values to 15. ONE REMAINS.
That is also why pty/ is a DIRECTORY and not three more flat names -- a
subdirectory costs one value and buys its own namespace, so `ctl` and `data`
did not have to be renamed.
Two things the core does not know, and which are therefore not invented: a
child's EXIT STATUS (a shell's death is `Event.eof`, which removes the pane,
so there is no directory left to read it in) and RAW/COOKED (the core never
sets a termios; the mode belongs to the program on the far side).
Verified live against a daemon: pty/ appears only on the terminal pane; a
`winsize 0 24` and a `sig SIGINT` are refused; a bad verb beside a good one
applies neither; `echo pty-works` written to pty/data runs in the shell and its
output reaches the body; and a blocking read of pty/data returns the raw stream,
OSC 133 marks and all. fs-bench unchanged and still zero allocations.
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Step 2 of the 9P chain (docs/9p.typ 12.2, docs/registry.typ 9P-2).
`drain` and `step` never asked a `*fuse.Fs` for anything but `retry()`,
`next()` and `reply()`, so the concrete pointer was a coupling that bought
nothing and forbade a second answer. `Transport` names the three; `Fs.transport()`
is the first implementor and the thunks are the entire cost.
No behaviour change. The order contract -- retry() to null, then next() to null --
moves into `drain`'s doc comment, where it belongs: it is the caller's rule and
every implementor inherits it, rather than a fact about FUSE.
`start` and `wake` keep their `*fuse.Fs`: they are about a MOUNT, which is a
FUSE thing, and a 9P listener will bring its own.
Measured unchanged against zig build fs-bench -Doptimize=ReleaseFast: getattr 19 ns,
lookup 40, read body 4K/1M 25/25, read ctl 385, read index 633, readdir 38,
read event (empty) 22, all at zero allocations.
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with no thread
Step 1 of the 9P chain (docs/9p.typ 12.1, docs/registry.typ 9P-14).
A detached session was the one configuration no script could drive. The core,
the panes and the undo history outlive every frontend that attaches -- and the
filesystem that would let a program read or change any of it was never mounted,
because `push_fs_reply` was one of the host methods this process left null.
Nothing prevented it; the call was simply not there.
It costs less here than in the desktop shells. They start a thread that blocks
on poll() and pokes a loop it does not otherwise share (`fs_service.wake`);
this process already runs ONE poll over its listener, its frontends, its pane
shells and inotify, so /dev/fuse is one more descriptor in the same syscall and
there is no thread at all. `Source.fuse`'s arm does nothing on purpose: being
in the set is the whole point, because the wake must end the sleep so that
`pollFrame` -- which runs after `pull_wait_input` returns, where re-entering
the core is legal -- reaches the drain.
`main.zig` refused `--detach --fs` outright, with a comment saying that
serving it would mean mounting FUSE in the detached core and that this was a
feature rather than a fix. It was right, and this is the feature. `--attach`
is still refused: a frontend has no core to serve.
Verified against the project's own clients: examples/acmefs/pardesctl panes,
new, send, body and del all drive a daemon, and the pane shells it forks now
inherit PARDES_FS/PARDES_PANE like every other host's.
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Esc stops recentring
## A terminal row's ANSI colours survive being edited
The loudest colour bug this editor had: one keystroke anywhere in a coloured shell row turned EVERY
column of it grey. `EditAnchors` anchored a buffer line only when it was BYTE-IDENTICAL to the shell
row it stood over, so a single differing byte dropped the whole row's colour projection. Worst shape
is invisible: append past the pane's right edge, where the text is clipped, and the row looks the
same and only its colour goes.
Anchoring is byte-level now. An edit leaves the row's own bytes at both ends, and being the same
bytes they keep the same colours; only what was typed has no cell under it, so only that takes none.
Live, on real `fastfetch`: a 32-column blue run split into 6 + 26 around one typed character.
Three defects underneath it, all found by machinery rather than by reading:
* A JOIN removes a buffer line while the buffer's covered span grows, so `lines == covered` and both
aligned guesses — Nth line over the Nth covered row, and the same counted from the bottom —
resolved to the SAME wrong row. Every untouched row below a join went plain. Anchoring is now a
streaming monotone matching: one shell-row cursor that only ever moves forward, advanced once per
buffer line, linear in the buffer where the version before it was quadratic.
* An EMPTY line is not evidence. Splitting a row makes one, it equals every blank row in the span,
and left free to look ahead it claimed the blank row below the last output and took every coloured
row in between out of reach of the lines that owned them.
* Reflow under a scrolled viewport. `PageList.getTopLeft(.viewport)` returns the viewport pin
verbatim, x and all, while `PageList.pin` forces x to 0 — so after a reflow remapped a tracked pin
into the middle of a row, the text pass dumped row 0 from that column while the colour pass paired
the fragment with the row's FIRST cells. Row 0 wore its left half's colours until the pane snapped
back to live output. `bodyText` dumps from column zero now, which is also what ghostty's own
renderer draws.
Also here: DECSCNM (reverse video) was silently dropped whenever `tty_filter` was off, because the
raw path resolved a `.none` colour by role and never consulted the mode.
The test that found the first two is the one worth keeping: random editing against an ABSOLUTE
oracle — every row's own text names the colour it must have — because the differential oracle it
replaced was blind by construction. It skipped the edited row, which is the row the user is
complaining about.
## Esc returns to a pane without moving its view
Esc in body normal mode runs `Last`, "the pane you were in before this one", and that went through
`focusPaneLine`, which recentred a file on the target line unconditionally. So returning to a buffer
repainted the whole screen to show a line that was already on it.
`focusPaneLine` takes a landing now: `.center` for the three callers going somewhere you have not
been (a look target, a path a pane already holds, `@pN:LINE:COL`), `.keep` for Esc. `.keep` leaves
the view alone and lets `ensureCursorVisible` — which already existed and already scrolls by the
minimum into the `scroll_off` band — be the only thing that may move anything.
Not `line = 0`, which `focusPaneLine` already understands as "focus and touch nothing": a background
pane's view can move while you are away, because the wheel scrolls the pane under the POINTER and a
resize reveals no cursor, so the recorded cursor plus a minimal nudge is what actually gets you back.
Ctrl-o and Ctrl-i keep centring, and the asymmetry is structural rather than arbitrary: `Last` only
ever CROSSES panes, so the pane it lands on already holds the view you left it with, while `jumpBy`
can land in the SAME pane, where a long in-file jump would arrive on the very top or bottom row with
`scroll_off` lines of context on one side. Helix splits the same pair the same way — its jumplist
centres, its buffer switch does not.
One deliberate consequence: under `.keep` a PDF's page is not restored AT ALL, because a page reveal
IS that pane's view and a reveal of the page you are already on still snaps `document_scroll_y` to
that page's start, discarding where you had read to. When something moved the pane while you were
away — the wheel again — Esc leaves it where the wheel left it, and Ctrl-o is how you reach the
recorded page.
## host_io.zig: the machine-local half of a host, once
`host.zig` is the seam. The part of the answer that is identical on every host with an operating
system under it — fork a pane's shell, put bytes on a disk — was written FOUR times: in tty.zig,
gui.zig, macos.zig and detached/server.zig. What those copies had in common says what they were for:
all four were missing FD_CLOEXEC on the pty master, so in every shell pardes has shipped, a program
in one pane could read another pane's terminal.
One copy now, and the wire got smaller for it: `ServerMsg.spawn` is gone. A frontend never asked the
server to fork anything — the server has an operating system under it and forks through `host_io`
like every other host — and `decodeClient` lost the scratch buffer that message needed.
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board cap on one screen
## The wire is the effect stream, not a new protocol
`pardes --detach` leaves a core running with no terminal; `pardes --attach` is a frontend that owns
a terminal and a socket and nothing else. N frontends on one core all look at the same screen —
`screen -x`, not N sessions.
The codec (`src/detached/wire.zig`) carries exactly one `Event` or one `Host.VTable` call per
message. That is not a coincidence and it is why there is no third vocabulary to keep in step: the
core's IO seam was already a struct of function pointers with plain-data arguments, so a socket is
a legal implementation of it. `nested.zig`'s socket could not be reused — it carries a builtin
command line, and a command line cannot carry a frame.
ARCHITECTURE-NEUTRAL on purpose, not as decoration. The frontend on the far end may be
riscv32-freestanding on the ESP32-P4 while the core is x86_64 Linux, so every field is an explicit
little-endian fixed width and no message is a blit of a native struct. A protocol that only works
between two builds of the same compiler would have thrown away the one frontend that motivated it.
## The board comes in; its toolchain stays out
`src/p4.zig` becomes `src/esp32p4.zig`, and the pardes half of `../05-zig-p4` — the vaxis-over-
serial runner, the UART editor terminal, the keystroke rescue ring, the on-die test suite — moves
into `src/esp32p4/`. `build.zig.zon` gains `.zig_p4 = .{ .path = "../05-zig-p4" }`, so
`zig build -Dplatform=esp32p4 -Desp32p4-firmware` builds, flashes, monitors and self-tests the
board from this repo's `build.zig`.
The DIVISION is the point. What moved is what only pardes wants: the runner that drives a pardes
core over a serial line. What stayed is everything a second project would also want — the HAL, the
register/radio/oracle layers, the linker script, `_start`. `zig_p4` declares no dependencies of its
own and its `build()` early-returns when it is not the root package, so this costs the package
graph exactly zero packages and the editor's own builds nothing at all.
## limits.zig: nine forgettable places become one budget
Nine `platform == .esp32p4` capacity tests lived in nine files. They were never nine decisions —
they are ONE decision, how much memory this build may spend, taken nine times where no reader could
see the total. `src/limits.zig` puts the whole budget on one screen with every cap named against
what it is measured against, derived from two booleans.
The payoff is testability on a machine that is not the board: the caps are ordinary comptime values,
so a host build can be compiled against the board's numbers and the parking, eviction and clamping
paths a 240 KiB core takes get exercised by the normal test suite instead of only over a UART.
## A bare `zig build`
`zig build` with no arguments now builds the tty and GUI binaries and installs them into
`~/.local/bin`, and says so once on stdout with the flag that overrides it. The old default built
one binary into `zig-out` — a path nothing on a `PATH` ever looks at, which made "build it" and
"use it" two different commands for no reason.
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