WIP: coordinate rename on the wire and in the browser (improvise-fdk1)

crates/improvise-command/src/command/cmd/commit.rs

@@ -636,7 +636,13 @@ fn commit_plain_records_edit(
         return;
     };
     match col {
-        RecordCol::Category(_) | RecordCol::Measure(_) => {
+        // The one door the wire's `RenameRecordCoordinate` also takes (improvise-fdk1).
+        RecordCol::Category(category) => effects.push(Box::new(effect::RenameRecordCoordinate {
+            record: row.coords.clone(),
+            category: category.clone(),
+            item: value.to_string(),
+        })),
+        RecordCol::Measure(_) => {
             effects.extend(effect::RecordRewrite::of(ctx.model, row, [(col, value)]).effects());
         }
         RecordCol::NewMeasure => add_measure(value, effects),

crates/improvise-command/src/ui/effect.rs

@@ -686,6 +686,29 @@ impl Effect for ApplyAndClearDrill {
     }
 }
 
+/// Move the record at `record` to `category = item`: the key path's and the wire's
+/// one door, through the same [`RecordRewrite`] a drill uses (improvise-fdk1).
+#[derive(Debug)]
+pub struct RenameRecordCoordinate {
+    pub record: CellKey,
+    pub category: String,
+    pub item: String,
+}
+impl Effect for RenameRecordCoordinate {
+    fn apply(&self, app: &mut App) {
+        let model = &app.model_state.workbook.model;
+        let row = crate::view::record_row(model, &self.record);
+        let col = RecordCol::Category(self.category.clone());
+        let rewrite = RecordRewrite::of(model, &row, [(&col, self.item.as_str())]);
+        for effect in rewrite.effects() {
+            effect.apply(app);
+        }
+    }
+    fn kind(&self) -> EffectKind {
+        EffectKind::Model(ModelChange::CellData)
+    }
+}
+
 /// A records row's edits composed into the one record they mean, read off the model
 /// before anything is written. Why composed: `context/code/command.md`, `RecordRewrite`.
 #[derive(Debug, Default, PartialEq)]

crates/improvise-command/src/ui/project.rs

@@ -322,8 +322,13 @@ fn cell_id(app: &App, layout: &GridLayout, row: usize, col: usize) -> Option<Cel
             RecordCol::NewMeasure => return Some(CellId::Create(CreateKind::Measure)),
             RecordCol::NewCategory => return Some(CellId::Create(CreateKind::Category)),
             // Renaming a coordinate moves every measure cell in the row, which is a
-            // different intent from `SetCell` and still the host's (gotcha 1).
-            RecordCol::Category(_) => return Some(CellId::Coordinate),
+            // different intent from `SetCell`: its own operands (gotcha 1, fdk1).
+            RecordCol::Category(category) => {
+                return Some(CellId::Coordinate {
+                    record: RecordHash::of(record),
+                    category: category.clone(),
+                });
+            }
         };
         return Some(CellId::Record(RecordCell {
             record: RecordHash::of(record),
@@ -491,11 +496,10 @@ pub fn published_basis(app: &App, grid: &GridCache) -> Basis {
         .iter()
         .flatten()
         .filter_map(|cell| match cell.id.as_ref()? {
-            CellId::Record(rc) => Some((rc.record, app.record_version_of(rc.record))),
-            CellId::Aggregate(_)
-            | CellId::Derived { .. }
-            | CellId::Create(_)
-            | CellId::Coordinate => None,
+            CellId::Record(RecordCell { record, .. }) | CellId::Coordinate { record, .. } => {
+                Some((*record, app.record_version_of(*record)))
+            }
+            CellId::Aggregate(_) | CellId::Derived { .. } | CellId::Create(_) => None,
         })
         .collect();
     basis::published(app.document_generation(), app.layout_version(), records)
@@ -5158,10 +5162,14 @@ mod cell_identity {
         let region = column_named(&app, "Region");
         let north = grid.cell(1, region).expect("the second row's coordinate");
         assert_eq!(north.text, "North", "setup: a visible coordinate cell");
+        let record = app.layout.record_row(1).expect("row 1").coords.clone();
         assert_eq!(
             north.id,
-            Some(CellId::Coordinate),
-            "a drawn coordinate is named"
+            Some(CellId::Coordinate {
+                record: RecordHash::of(&record),
+                category: "Region".into(),
+            }),
+            "a drawn coordinate is named, with its own record and category (fdk1)"
         );
         let nameless: Vec<(usize, usize)> = (0..app.layout.row_count())
             .flat_map(|r| (0..app.layout.col_count()).map(move |c| (r, c)))

crates/improvise-command/src/ui/reduce.rs

@@ -147,6 +147,20 @@ pub fn model_effects(app: &App, cmd: &ModelCommand) -> Vec<Box<dyn Effect>> {
             };
             Box::new(effect::ClearCell(key))
         }
+        ModelCommand::RenameRecordCoordinate {
+            record,
+            category,
+            item,
+        } => {
+            let Some(record) = app.resolve_record(*record) else {
+                return vec![];
+            };
+            Box::new(effect::RenameRecordCoordinate {
+                record,
+                category: category.clone(),
+                item: item.clone(),
+            })
+        }
         ModelCommand::AddItem { category, item } => Box::new(effect::AddItem {
             category: category.clone(),
             item: item.clone(),
@@ -664,6 +678,11 @@ pub(crate) mod tests {
                 value: CellValue::Number(1.0),
             },
             ModelCommand::ClearCell(record_cell(&a_stored_cell())),
+            ModelCommand::RenameRecordCoordinate {
+                record: record_cell(&a_stored_cell()).record,
+                category: "Region".into(),
+                item: "West".into(),
+            },
             ModelCommand::AddItem {
                 category: "Region".into(),
                 item: "South".into(),
@@ -744,6 +763,7 @@ pub(crate) mod tests {
         match cmd {
             ModelCommand::SetCell { .. } => "SetCell",
             ModelCommand::ClearCell(_) => "ClearCell",
+            ModelCommand::RenameRecordCoordinate { .. } => "RenameRecordCoordinate",
             ModelCommand::AddItem { .. } => "AddItem",
             ModelCommand::AddItemInGroup { .. } => "AddItemInGroup",
             ModelCommand::RemoveItem { .. } => "RemoveItem",

crates/improvise-core/src/view/layout.rs

@@ -104,6 +104,18 @@ pub fn drill_snapshot(model: &Model, constraint: &CellKey) -> Vec<RecordRow> {
     RecordRow::group(cells)
 }
 
+/// The records row `record` is, as the records grid groups it; empty when no
+/// cell stores it. The one lookup a rename by record uses (improvise-fdk1).
+pub fn record_row(model: &Model, record: &CellKey) -> RecordRow {
+    drill_snapshot(model, record)
+        .into_iter()
+        .find(|row| &row.coords == record)
+        .unwrap_or_else(|| RecordRow {
+            coords: record.clone(),
+            values: Vec::new(),
+        })
+}
+
 /// One step of a view configuration: **what** a view must be, with no answer
 /// to how a front end gets there. The model half of drill — core.md §8.
 #[derive(Debug, Clone, PartialEq, Eq)]

crates/improvise-core/src/view/mod.rs

@@ -5,7 +5,7 @@ pub mod types;
 pub use axis::{Axis, AxisColor};
 pub use layout::{
     AxisEntry, GridLayout, NEW_CATEGORY_COL, NEW_MEASURE_COL, RecordCol, RecordRow, ViewStep,
-    drill_constraint, drill_snapshot, drill_steps, records_spine, records_steps,
+    drill_constraint, drill_snapshot, drill_steps, record_row, records_spine, records_steps,
     synthetic_record_info,
 };
 pub use types::{

crates/improvise-protocol/src/basis.rs

@@ -93,6 +93,22 @@ impl BasisCache {
     }
 }
 
+impl BasisCache {
+    /// A basis for records whose counters were read EARLIER, such as when an
+    /// editor opened (improvise-0j0f). The document tiers are current.
+    pub fn claim_as_read(
+        &self,
+        read: impl IntoIterator<Item = (RecordHash, u64)>,
+    ) -> Option<Basis> {
+        let current = self.current.as_ref()?;
+        Some(Basis {
+            document_generation: current.document_generation,
+            layout_version: current.layout_version,
+            records: read.into_iter().collect(),
+        })
+    }
+}
+
 impl WidgetCache for BasisCache {
     type Update = Basis;
 

crates/improvise-protocol/src/client.rs

@@ -6,6 +6,7 @@ use crate::{
     Rejection, Snapshot, TileBarCache, ViewListCache, ViewState, WidgetCache, reduce_view,
     settled_mode,
 };
+use improvise_core::model::record::RecordHash;
 use serde::Serialize;
 
 /// One client's whole state: the portable session slice plus one cache per
@@ -43,6 +44,19 @@ pub struct ClientState {
     /// replay the rest. Why a queue: `context/code/clients.md`.
     #[serde(skip)]
     pub in_flight: std::collections::VecDeque<Sent>,
+    /// The coordinate an open editor renames, captured as the user saw it.
+    /// When it is taken, and when not yet: `context/code/clients.md`.
+    #[serde(skip)]
+    pub opened: Option<OpenedCoordinate>,
+}
+
+/// A coordinate editor's target: the record, the category, and the record's
+/// write counter when the editor opened (improvise-fdk1, improvise-0j0f).
+#[derive(Debug, Clone, PartialEq, Eq)]
+pub struct OpenedCoordinate {
+    pub record: RecordHash,
+    pub category: String,
+    pub version: u64,
 }
 
 /// One frame this client has sent. `awaited` is true exactly when the host
@@ -75,6 +89,7 @@ impl ClientState {
         }
         self.settle_mode();
         self.settle_editor();
+        self.settle_opened();
         self.revision += 1;
     }
 
@@ -87,6 +102,7 @@ impl ClientState {
         }
         self.settle_mode();
         self.settle_editor();
+        self.settle_opened();
         self.revision += 1;
     }
 
@@ -113,6 +129,7 @@ impl ClientState {
             }
         }
         self.settle_sent();
+        self.settle_opened();
     }
 
     /// The host applied **none** of the oldest awaited frame (ADR 001 clause
@@ -127,6 +144,7 @@ impl ClientState {
         self.last_rejection = Some(rejection);
         self.settle_mode();
         self.settle_editor();
+        self.settle_opened();
         self.revision += 1;
     }
 
@@ -161,6 +179,26 @@ impl ClientState {
         self.view.mode = settled_mode(&self.view.mode, self.grid.records);
     }
 
+    /// Capture the coordinate an open editor renames, but only from a cache that
+    /// shows the host's answer to this client's own writes (improvise-fdk1).
+    fn settle_opened(&mut self) {
+        let answered = !self.in_flight.iter().any(|sent| sent.awaited);
+        self.opened = match (self.view.mode.is_editing(), self.opened.take()) {
+            (false, _) => None,
+            (true, Some(opened)) => Some(opened),
+            (true, None) if answered => crate::resolve::coordinate_at_cursor(self)
+                .and_then(|(record, category)| {
+                    let version = self.basis.current()?.record(record)?;
+                    Some(OpenedCoordinate {
+                        record,
+                        category,
+                        version,
+                    })
+                }),
+            (true, None) => None,
+        };
+    }
+
     /// An editor that arrived without its buffer is seeded here, so what is
     /// drawn and what Enter commits read one buffer (improvise-ktlk).
     fn settle_editor(&mut self) {

crates/improvise-protocol/src/reduce.rs

@@ -86,6 +86,13 @@ pub enum ModelCommand {
         value: CellValue,
     },
     ClearCell(RecordCell),
+    /// Move a whole record to a new coordinate, creating the item if need be.
+    /// Position-free: it names the record, never a row (improvise-fdk1).
+    RenameRecordCoordinate {
+        record: RecordHash,
+        category: String,
+        item: String,
+    },
     AddItem {
         category: String,
         item: String,
@@ -170,6 +177,7 @@ pub enum ModelCommand {
 pub fn records_named(cmd: &ModelCommand) -> Vec<RecordHash> {
     match cmd {
         ModelCommand::SetCell { cell, .. } | ModelCommand::ClearCell(cell) => vec![cell.record],
+        ModelCommand::RenameRecordCoordinate { record, .. } => vec![*record],
 
         ModelCommand::AddItem { .. }
         | ModelCommand::AddItemInGroup { .. }
@@ -606,6 +614,11 @@ mod tests {
         match cmd {
             ModelCommand::SetCell { cell, value: v } => record(cell) + value(v),
             ModelCommand::ClearCell(cell) => record(cell),
+            ModelCommand::RenameRecordCoordinate {
+                record: r,
+                category,
+                item,
+            } => surrogate(r) + name(category) + name(item),
             ModelCommand::AddItem { category, item }
             | ModelCommand::RemoveItem { category, item } => name(category) + name(item),
             ModelCommand::AddItemInGroup {

crates/improvise-protocol/src/render.rs

@@ -55,9 +55,9 @@ pub enum CellId {
     /// A records-mode creating column: typing a **name** into it adds that
     /// measure or category and writes no cell at all (gotcha 1, improvise-poia).
     Create(CreateKind),
-    /// A records-mode coordinate. Renaming it moves every measure cell in the
-    /// row (gotcha 1), which no client composes: `protocol.md` §3 (improvise-exdg).
-    Coordinate,
+    /// A records-mode coordinate: the row's record and the category this column
+    /// names. Renaming it moves the whole record — `protocol.md` §3 (improvise-fdk1).
+    Coordinate { record: RecordHash, category: String },
 }
 
 /// What a creating column creates. The name typed into it is the whole

crates/improvise-protocol/src/resolve.rs

@@ -736,15 +736,15 @@ fn cell_at_cursor(state: &ClientState) -> Option<&crate::CellDisplay> {
 /// declining out loud rather than upstream. See `context/code/clients.md`.
 fn edit_or_drill(state: &ClientState, mode: AppMode) -> Option<Vec<Command>> {
     // The grid, not the mode: a records GRID is the observed fact and the mode
-    // follows it (improvise-bd9o, `context/code/clients.md`).
-    if state.grid.records {
+    // follows it (improvise-bd9o). A coordinate is the one records cell it commits.
+    if state.grid.records && coordinate_at_cursor(state).is_none() {
         return Some(vec![Command::SetStatus(not_yet("editing in records mode"))]);
     }
     let cell = cell_at_cursor(state)?;
     match cell.id.as_ref()? {
         // `edit_text`, never `text`: the drawn text has been through
         // `format_f64`. `tests/lockstep.rs` found exactly that.
-        CellId::Record(_) => Some(vec![
+        CellId::Record(_) | CellId::Coordinate { .. } => Some(vec![
             Command::SetBuffer {
                 name: "edit".to_string(),
                 value: cell.edit_text.clone().unwrap_or_default(),
@@ -761,7 +761,17 @@ fn edit_or_drill(state: &ClientState, mode: AppMode) -> Option<Vec<Command>> {
         // Both creating columns are records-only, so the guard above takes
         // them; declining rather than `None` keeps that a door, not a hole.
         CellId::Create(_) => Some(vec![Command::SetStatus(not_yet("creating a column"))]),
-        CellId::Coordinate => Some(vec![Command::SetStatus(not_yet("renaming a coordinate"))]),
+    }
+}
+
+/// The record and category of the coordinate cell under the cursor, as the
+/// projection names them — never borrowed from a sibling cell (ADR 002).
+pub(crate) fn coordinate_at_cursor(state: &ClientState) -> Option<(crate::RecordHash, String)> {
+    match cell_at_cursor(state)?.id.as_ref()? {
+        CellId::Coordinate { record, category } => Some((*record, category.clone())),
+        CellId::Record(_) | CellId::Aggregate(_) | CellId::Derived { .. } | CellId::Create(_) => {
+            None
+        }
     }
 }
 
@@ -869,7 +879,7 @@ fn commit(state: &ClientState, edit_mode: AppMode, advance: Advance) -> Option<V
         return create_column(state, edit_mode, advance, kind, &text);
     }
     if state.grid.records {
-        return None;
+        return rename_coordinate(state, edit_mode, advance, id, &text);
     }
     let mut commands = vec![Command::Model {
         basis: state.basis.claim([record_at_cursor(state)?])?,
@@ -880,6 +890,38 @@ fn commit(state: &ClientState, edit_mode: AppMode, advance: Advance) -> Option<V
     Some(commands)
 }
 
+/// `CommitAndAdvance` over a coordinate: rename the record the editor OPENED on,
+/// at the version it was shown — `context/code/clients.md` (improvise-fdk1).
+fn rename_coordinate(
+    state: &ClientState,
+    edit_mode: AppMode,
+    advance: Advance,
+    id: &CellId,
+    text: &str,
+) -> Option<Vec<Command>> {
+    let CellId::Coordinate { .. } = id else {
+        return None;
+    };
+    let Some(opened) = state.opened.as_ref() else {
+        return Some(vec![Command::SetStatus(
+            "still waiting for the host to answer your last edit".to_string(),
+        )]);
+    };
+    let mut commands = vec![Command::Model {
+        basis: state
+            .basis
+            .claim_as_read([(opened.record, opened.version)])?,
+        cmd: ModelCommand::RenameRecordCoordinate {
+            record: opened.record,
+            category: opened.category.clone(),
+            item: text.to_string(),
+        },
+    }];
+    commands.push(Command::ChangeMode(AppMode::Normal));
+    commands.extend(advanced(state, edit_mode, advance)?);
+    Some(commands)
+}
+
 /// `CommitAndAdvance` over a creating column: a schema change over the typed
 /// NAME. Why +cat does not advance: clients.md (improvise-gcvb).
 fn create_column(
@@ -955,7 +997,10 @@ fn advanced(state: &ClientState, edit_mode: AppMode, advance: Advance) -> Option
 fn record_at_cursor(state: &ClientState) -> Option<crate::RecordHash> {
     match cell_at_cursor(state)?.id.as_ref()? {
         CellId::Record(cell) => Some(cell.record),
-        CellId::Aggregate(_) | CellId::Derived { .. } | CellId::Create(_) | CellId::Coordinate => {
+        CellId::Aggregate(_)
+        | CellId::Derived { .. }
+        | CellId::Create(_)
+        | CellId::Coordinate { .. } => {
             None
         }
     }
@@ -1024,7 +1069,10 @@ fn model(state: &ClientState, cmd: ModelCommand) -> Option<Command> {
 fn record_cell_at_cursor(state: &ClientState) -> Option<RecordCell> {
     match cell_at_cursor(state)?.id.as_ref()? {
         CellId::Record(cell) => Some(cell.clone()),
-        CellId::Aggregate(_) | CellId::Derived { .. } | CellId::Create(_) | CellId::Coordinate => {
+        CellId::Aggregate(_)
+        | CellId::Derived { .. }
+        | CellId::Create(_)
+        | CellId::Coordinate { .. } => {
             None
         }
     }

crates/improvise-wasm-client/src/lib.rs

@@ -175,7 +175,7 @@ impl Client {
             CellId::Aggregate(_)
             | CellId::Derived { .. }
             | CellId::Create(_)
-            | CellId::Coordinate => None,
+            | CellId::Coordinate { .. } => None,
         }
     }
 

crates/improvise-wasm-client/src/render.rs

@@ -150,7 +150,7 @@ impl RenderCell {
                     CellId::Aggregate(_)
                     | CellId::Derived { .. }
                     | CellId::Create(_)
-                    | CellId::Coordinate,
+                    | CellId::Coordinate { .. },
                 )
                 | None => false,
             },
@@ -638,7 +638,10 @@ mod tests {
                     ((1, 0), CellDisplay::text("pending")),
                     (
                         (1, 2),
-                        CellDisplay::text("North").with_id(CellId::Coordinate),
+                        CellDisplay::text("North").with_id(CellId::Coordinate {
+                            record: surrogate(),
+                            category: "Region".into(),
+                        }),
                     ),
                 ])),
             ],

crates/improvise-wasm-client/tests/browser_round_trip.rs

@@ -803,7 +803,7 @@ fn rename_north(racing: bool) -> (Host, Vec<Addressed>) {
     deliver(&mut a, &[a_snap]);
     deliver(&mut b, &[b_snap]);
 
-    let mut press_a = |host: &mut Host, a: &mut Client, b: &mut Client, key: &str| {
+    let press_a = |host: &mut Host, a: &mut Client, b: &mut Client, key: &str| {
         let Some(frame) = a.key(&BrowserKey::new(key)) else {
             return Vec::new();
         };