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//! **The one door a reply comes in through** — and the one leg that brought no
//! reply at all.
//!
//! Split from [`super`] at the 300-line cap on the seam that module's own doc
//! already draws: [`super`] is *what the window holds between frames*, and this
//! is *how what arrives becomes part of it*. The first changes when a pane
//! learns to hold something; the second when a kind lands.
//!
//! **Nothing that arrives is dropped.** An answer is filed, and a refusal or an
//! unreadable frame becomes the [`Notice`](super::Notice) the shell paints
//! *where that content would have been* — `crate::reply`'s rung 2 honoured on
//! the glass rather than only in the type. The two read differently on purpose:
//! a refusal is the engine's sentence and an unreadable frame is a statement
//! about this seat, of which only the second is fixed by an upgrade.
//!
//! **And a leg that reached no engine is neither.** It is not a frame and does
//! not come through [`Model::absorb`]; it is a fact about a *relationship*
//! rather than about an exchange, so it is said on that channel's own section
//! (REMOTE §8.2, bl-e620).
use super::{Channel, Chunk, Held, Model, Notice};
use crate::reply::{Read, Reply};
impl Model {
/// **Take one reply frame.** The single door: an answer is filed, and
/// anything else becomes the notice the shell paints where that answer's
/// content would have been. `channel` is the client-side stamp, applied
/// here and nowhere else.
pub fn absorb(&mut self, channel: &Channel, read: Read) {
match read {
Read::Answer(reply) => self.file(channel, reply),
Read::Refusal(said) => self.notice = Some(Notice::Refused(said)),
Read::Unreadable(why) => self.notice = Some(Notice::Unreadable(why)),
}
}
/// File one answer. A roster answer replaces its **own channel's** chunk
/// and leaves every other one standing, which is REMOTE §8.2's *"a refusal
/// is one entry's, never the set's"* read from the other side: a box
/// serving three engines does not lose the two that are fine.
fn file(&mut self, channel: &Channel, reply: Reply) {
match reply {
Reply::Workspaces(view) => self.seat(channel, view),
// The one answer a claim can be spent against: a listing is where
// the started conversation first becomes addressable
// ([`Model::resolve`]).
Reply::Conversations(rows) => {
self.convs = rows;
self.answered = self.aim.clone();
self.resolve();
}
// Filed whether or not the pane is open: the read stands only while
// it is, so a frame after it closed is the last one in flight.
Reply::Roles(rows) => self.roles = Some(rows),
// **The queue, one channel's slice at a time** — the fan's answer
// replaces what this channel last said and leaves the others
// standing, exactly as a roster answer does (`queue`).
Reply::Attention(rows) => self.asking(channel, rows),
// The records pair, on the same terms as the roles above.
Reply::Steps(listing) => self.steps = Some(listing),
Reply::Files(answer) => self.files = Some(answer),
// **The window's own two, one channel's slice at a time** — each
// op names no workspace, so each answer replaces what its channel
// last said and leaves the others standing, exactly as a roster
// answer and a queue answer do (`window`; bl-40ec).
Reply::Help(rows) => self.paged(channel, rows),
Reply::Found(found) => self.hit(channel, found),
// The login pane's three, on the roles' own terms — filed whether
// or not the pane is open, because a frame that arrives after it
// closed is the last one in flight rather than a thing to drop.
// The table's rows and one row's offering are plain answers; the
// sign-in run replaces, exactly as the live tail does, because the
// lane hands over the whole fold (`crate::offframe::signin`).
Reply::Providers(rows) => self.providers = Some(rows),
Reply::Models(rows) => self.offered = Some(rows),
Reply::Login(run) => self.signin = Some(run),
Reply::Transcript(transcript) => self.transcript = transcript,
Reply::Follow(stream) => self.live = Some(stream),
// The start family's two, whose whole product is each other: the
// staged body composes the fire, and the fire's receipt is the
// minted name. [`Start`] holds the chain.
// The one answer that is never filed as content: it is drawn, held
// while the picture is on screen, and dropped with the pane.
Reply::Enrolled(material) => self.enrolled(&material),
Reply::Prepared(prepared) => self.fire(&prepared),
Reply::Started { conversation } => self.started(conversation),
// The three receipts. None carries content, so what they change is
// whether the operator is told something happened — and a captured
// run that failed is told in the child's own words. The advance and
// the raise are ONE arm rather than two identical ones, which is
// the honest shape: what each changed arrives on the transcript and
// on the next queue respectively, and this end predicts neither.
Reply::Nudged | Reply::Flagged => self.notice = None,
Reply::Outcome(outcome) => {
self.notice = (!outcome.ok()).then_some(Notice::Refused(outcome.stderr));
}
}
}
/// Seat one channel's roster answer. **The channel comes in with the
/// answer** rather than being looked up: what a channel is called here and
/// what it is called on its host are facts the asker holds, and a model
/// that re-derived them would be a second authority for them.
fn seat(&mut self, channel: &Channel, view: crate::reply::roster::Workspaces) {
let seated = Chunk {
channel: channel.clone(),
// **The answer spends whatever the section was standing on**: a
// channel that has answered is neither unheard nor unheld, and an
// engine that answered zero workspaces holds zero — which is a
// different sentence from either (bl-08b6).
held: Held::Heard,
stale: view.stale,
growth: view.growth,
walls: view.rows,
};
match self
.roster
.iter_mut()
.find(|chunk| chunk.channel.name == channel.name)
{
Some(held) => *held = seated,
None => self.roster.push(seated),
}
}
/// **A leg that never reached an engine**, said on that channel's own
/// section (bl-e620).
///
/// It is not a reply and so it does not come through
/// [`absorb`](Self::absorb): there is no frame, no channel answered, and
/// nothing to file. And it is not the shell's bar either, which is where it
/// used to go. **A refusal is an exchange; an unreachable channel is a
/// relationship**, and REMOTE §8.2 rules that one *"is that channel's
/// workspaces painted unreachable, never the whole shell, which stays
/// reserved for the one wire the window cannot exist without."* Three
/// things followed from getting that wrong, all driven live: the sentence
/// named no subject at all (*"this seat could not reach **it**"*), a seat
/// holding two dead channels heard about exactly one of them forever
/// because there is one bar and the last writer wins, and the bar's dismiss
/// was inert — a relationship that is down is down on every beat, so it
/// re-posted faster than a hand can clear it. A row's state is not
/// something one dismisses.
///
/// The bar is kept for a channel this box holds no section for, which is
/// the one case with nowhere else to say it — and it names the channel,
/// because a fact with no home still has a subject.
///
/// **An ACT that failed is not this** — see [`Model::acted`], which is that
/// same division applied rather than bent.
pub fn unreachable(&mut self, channel: &Channel, why: String) {
match self
.roster
.iter_mut()
.find(|chunk| chunk.channel.name == channel.name)
{
Some(held) => held.held = Held::Unheld(why),
None => self.notice = Some(Notice::Unreachable(format!("{}: {why}", channel.name))),
}
}
/// **An act that earned no reply** (yog's `docs/REMOTE.md` §3, bl-3969).
///
/// It goes to the bar and takes no channel, which is
/// [`unreachable`](Self::unreachable)'s own rule read the other way: *a
/// refusal is an exchange; an unreachable channel is a relationship*, and a
/// gesture an operator made is an exchange whatever went wrong with it. Two
/// further things follow and both are the section's reasons inverted. The
/// section is the slot a `workspaces` answer overwrites (`Model::seat` sets
/// `Held::Heard` on every one), and the asker answers `workspaces` on every
/// beat — so an act's sentence written there is erased within one beat by a
/// read that succeeded, which is exactly the wrong outcome for the one fact
/// on this window that nothing will say again. And the bar's dismiss is
/// live here rather than inert: an act is an event, not a state, so it does
/// not re-post on a beat, and *I have looked* is a real thing for an
/// operator to say about one.
///
/// **The recovery is on the glass already.** The contract's answer to a
/// lost reply is a read, and this window's reads never stopped — the
/// standing set is re-derived from the focus and asked every beat, so the
/// conversation, the roster and whichever pane is open are being asked again
/// while the sentence stands. That is why there is no control here and no
/// mapping from an act to *its* read: a control would be a second spelling
/// of the beat, and the parity roster judges controls, not states (§4.16).
pub fn acted(&mut self, op: &str, reach: &crate::channel::Reach) {
self.notice = Some(Notice::act(op, reach));
}
}