[thebhef]

Export names one file and writes a slice of what has already been
captured. A logger is the standing counterpart: a project element with
its own panel, pointed at a templated folder and file, that keeps
writing BLF to disk while it is switched on. Both fields resolve through
the same host command the export dialog's preview uses, so the tokens
and their strftime formats stay the model's; {logger} is the fifth,
available only inside one, and a logger's {now} is the moment logging
started rather than the moment a field was read.

Logging runs exactly while the logger is enabled and something is
connected. That rule lives in one place: connection_state::emit — the
single write path both set_and_emit and remove_and_emit funnel
through — reconciles the loggers, so "the state changed" and "the
loggers followed it" cannot drift apart. The decision itself is a pure
function over (configs, running, connected), tested without an app, a
filesystem, or a connection. Unlike the RBS Run flag (ADR 0028), the
enabled flag is saved with the project: logging writes locally and puts
nothing on a bus, so opening a project can resume one without
transmitting.

The writer does not sit on the ingest path. run_pump is the obvious
hook and the wrong one: it would put a probe and a frame clone on the
hot path of every session, logger or not. Instead a writer thread
follows the capture model's own index — remember how far you have
written, ask the trace store for what has been appended since, write
that. Nothing is added to a session with no logger running, every frame
source is covered without naming one, and the render-tier runs show no
change in frame rate or mean lag with a logger writing throughout. What
it gives up is a guarantee against eviction outrunning the writer, so
settle_cursor detects exactly that and says so on the system log
rather than leaving a silent gap.

Reaching the size cap closes the file and opens the next, with -002,
-003… on the last path segment before its extension; a run that starts
where a file already sits takes the next suffix the same way. One rule,
first_free_part, applied at the start and at every roll. The cap is
read from BlfCaptureWriter::bytes_on_disk, new here — the header plus
every flushed container, counted rather than seeked — because
FinishedCapture::byte_size is only correct after finish consumes the
writer, which is no use to a file deciding whether to keep going.

Worth a reviewer's attention: stopping a logger waits for its writer
thread, and the exit path stops every logger after disconnect_on_exit.
The first live run left a capture whose header said file_size = 0 —
the process walked away while the thread was still asleep between polls,
so finish never ran and the file was readable only through the
reader's recovery path. A condvar-backed stop signal wakes the thread
instead of polling it out, which is what makes the wait cheap enough to
put on the disconnect path.

The folder's file gridview is the next phase; the panel stops after
folder, file, preview and format, and the writing status belongs in that
list rather than in a status line here.

Co-Authored-By: Claude Fable 5 noreply@anthropic.com

[thebhef]

• Filter the unit picker, and let a composed kind offer its whole class #509 : 2 dependent PRs (#510 , #520 )
• Read the whole unit table out of the library instead of typing it #508
• Name the project in each project-caches row; Delete becomes two-stage #507
• The settings view re-reads what it shows and keeps its place #506
• Draw plot sample markers as squares, collapsed per pixel column #505
• Draw the plot's hover chrome on an overlay canvas #504
• Close the palette before running the picked command #503
• Plumb empty plot areas, per-area event-marker base, and an Events chip #501
• Move the cursor and event readouts out of the data area into gutters #500
• Mark every served sample, and make an enum lane an ordinary series #499
• Serve every window as first, last, min and max, and drop the categorical reducer #498
• Measure what a plain min/max serve does to a held enum code #497
• Filter the Trace panel's rows with the same fzf, in both modes #496
• Rank the trace's rows host-side with the app's own fzf #495
• Let a bus explicitly set to no interface connect as unbound #494
• Let regular collapse/expand work while the database/RBS filter is active #493
• Groom five tasks: four out of the user feedback, plus the trace filter #492
• close out math signal, python server client, export dialog #475
• The example captures are plain git blobs, not LFS objects #490
• The local hardware sidecar is named for what it is, not for one library #489
• The anchor index folds on the flush cadence and survives a relaunch #487
• A BLF export walks the store in chunks instead of snapshotting it #486
• Compose a unit from the ones the app already knows #485
• A pressed chip inside a segment reads as pressed, in every theme #484
• Icon controls and the run toggle replace text buttons in the project panel #483
• A unit is picked as a base and a prefix, wherever one is chosen #482
• A unit is a base unit and a prefix, and every function derives one #481
• The signal mapping panel flags the unit strings nothing can place #480
• The math editor sets the scaling, and the settings view says what a unit string means #477
• A math signal's unit becomes the target its operands convert to #476
• Math signals reach the plot, the signal views and an MDF export #474
• Math signals are created and edited in place under the Computed branch #473
• Math signals compute host-side as a fourth decode provenance #472
• The logger folder's file gridview lists what it holds, recursively #471
• A project logger writes the capture to file while it is connected #470 👈 (View in Graphite)
• An export dialog names the capture and its slice, and the write runs in the background #469
• Host-side template resolution and sticky state for log export #468
• Accept a cannet server from the command line #488
• Correct delivered timestamps for the peer's clock, and detect servers #467
• A python-can application opens a cannet bus by naming a trusted server #466
• Make the wire protocol state its version, and every client check it #491
• The database panel's search box takes a click anywhere in the box #479
• Ctrl+F finds in the settings panel #478
• misc feedback + planning updates #464 : 1 other dependent PR (#465 )
• main

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