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examples/board.aup is a kanban board: people add and move cards on
Vega's surfaces, programs post JSON to the same module served by
pure-serve, with no routes written. The checks write cards with the CLI
into a store, serve that store over HTTP where a program moves one and
adds another, and read it again with the CLI, the focus still on the
card it was on.
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The terminal and the web page set the time events see to the wall clock
and tick an app's timers on time: each round ticks what is due, draws,
then waits for input, a frame or the next tick, and a tick is news to
every open page at once. Scripts have no clock: time MS sets the time
the next events see and tick TIMER ticks, so an app that uses time
replays exactly. A module swap reschedules the timers.
examples/stopwatch.aup runs on every surface; the checks drive it by
script, on a pseudo-terminal by the clock, and on the web page.
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examples/tally.aup counts typed words in a list keyed by the word: the
screen stays sorted with each word once, typing a word again counts it
and moves the focus to it. It runs on the three surfaces with the other
examples, and vega check finds nothing in it.
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vega tui|web MODULE --watch replaces the running app's module when its
file is written again (aup watch writes it); states keep their values by
name through pure_app_replace and every web page hears of it. The file is
compared by the digest of its bytes, at most five times a second, so a
module of the same size written within the same second is not missed; a
module that does not load leaves the app as it was and is not tried
again. Modules alternate between two slots so a failed load never touches
the running one. Scripts get swap MODULE; whether a module runs frames is
now a property of the screen.
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The todo example now counts its open tasks, so the field line changes
with more events; a changed frame sends 143 B on average, not 139 B.
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A list may now be filtered (each t in tasks where !t.done), and several
filtered lists over one list share one focus: the focus view names an
item, so Vega asks Pure which row shows it and highlights it only in the
list that holds it; the other lists have no focus (null in the web
surface's JSON, and the spoken surface names the item where it is). A
click or point on a row points at the item that row shows, and the wheel
on a list without the focus focuses the row under it. Pure's rows now
take a mutable app.
examples/today.aup shows what is open and what is done; its CLI output
matches a model over random adds, moves, toggles and points into either
list, and the web surface leaves the other list without a focus.
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vega web MODULE serves the screen to a browser (127.0.0.1 unless given
--listen): one dependency-free page draws the title, fields, lists as
listboxes and tables, with tones as colors and the focus highlighted. It
asks for the screen as JSON with the rows it can show per list or table,
so only those cells are evaluated, scrolled like the TUI around the
focus. Keys go as KeyboardEvent.code, which is Pure's key naming already;
typed text commits with Enter; a click or the wheel moves the focus
through pure_app_point; an event stream tells every open page of each
change. Scrolling, key presses and text commits are now shared helpers.
The checks drive it against the model (1,200 random steps: title, field,
rows, focus, the window of items with badges and tones), check a table's
columns and cells, post at random to every example, and in headless
Chromium over the DevTools protocol press keys, click a row and type
Korean text into the page itself.
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Only the app's key handlers could move a list's focus. When the focus
view is a plain index position (`view tasks_list_focus = at.position`),
Vega now asks Pure for that index and moves it as a user pointing at a
row (pure_app_point), with no code in the app. The grid remembers which
item each line shows; in the TUI a click on a row focuses it and the
wheel moves the focus one row (SGR mouse reports, turned off on exit).
Scripts say point VIEW ROW or click LINE COLUMN on the last shown frame.
The focus is stored like any event, so the next run of any surface
starts from it.
The model now points too: random scripts with points (some past the
end) and TUI clicks still match it on every surface, a mouse click on a
real pseudo-terminal moves the focus, and the stored session keeps it.
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The TUI rebuilt its grid from the app on every change and then sent all
of it. It now keeps what the terminal shows and sends each run of changed
cells after a cursor move (short unchanged gaps stay in a run, being
cheaper than another move; a run that starts in the second half of a wide
character starts at its first). A resize sends everything again.
vega tui --paint WxH writes the bytes of each frame; the checks replay
them with a small terminal emulator and compare with the dumped frame:
4,800 random frames at three sizes agree, and a change costs 139 bytes on
average against 1,220 for a whole frame. The interactive check now reads
the final screen from the replayed bytes.
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Surfaces read a view that misses a convention as something else without
a word: a number label makes a list a table, a text tone disappears, a
list never shows its other columns, X_focus without a table becomes a
field, a second text input has nowhere to type. vega check MODULE names
each such place (the view or input and what the surface does instead)
and exits 1; the rules sit next to the code that reads the screen.
The checks build a spec that misses eight conventions and expect exactly
its nine findings, and none in the examples.
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Every surface takes --store PATH and runs the app on Pure's tree store,
so a list typed in the terminal is there the next time, on any surface.
Vega and the app carry no saving code; Vega saves the last frame changes
when it ends.
Checks let the CLI and the sentence surface take turns on one store and
match the model each time, and reopen an interactive session's store.
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Vega reads a verified Pure module by convention: a table view with a
label column is a list (with optional badge, detail and tone), any other
table is a table, <table>_focus is its focused row, a title view is the
title and other views are fields. lib/vega.aup gives aup apps the tones,
which say what a row means; each surface decides how it looks or sounds.
vega tui draws the screen in a terminal, keeps the focused row in view
and evaluates only the cells on screen; vega cli prints plain lines for
pipes; vega say speaks the screen and each focus change as sentences.
Display width handles Hangul, CJK, emoji, combining marks and controls.
tests/check.py compares the CLI and NUI output with a reference model of
examples/todo.aup line for line, checks 9,600 TUI frames for scrolling,
focus, badge alignment and the number of cells evaluated, drives the
interactive TUI on a pseudo-terminal, and runs every aup example on every
surface.
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