Merge 7681cc93fd into 395a71bf53

book/src/generated/static-cmd.md

@@ -167,6 +167,8 @@
 | `extend_to_line_start` | Extend to line start | select: `` <home> `` |
 | `extend_to_first_nonwhitespace` | Extend to first non-blank in line |  |
 | `extend_to_line_end` | Extend to line end | select: `` <end> `` |
+| `undo_selection` | Go to previous selection | normal: `` <A-k> ``, select: `` <A-k> `` |
+| `redo_selection` | Go to next selection | normal: `` <A-w> ``, select: `` <A-w> `` |
 | `extend_to_line_end_newline` | Extend to line end |  |
 | `signature_help` | Show signature help |  |
 | `smart_tab` | Insert tab if all cursors have all whitespace to their left; otherwise, run a separate command. | insert: `` <tab> `` |

helix-term/src/commands.rs

@@ -44,7 +44,7 @@ use helix_core::{
     Selection, SmallVec, Syntax, Tendril, Transaction,
 };
 use helix_view::{
-    document::{FormatterError, Mode, SCRATCH_BUFFER_NAME},
+    document::{FormatterError, Mode, SelectionDirection, SCRATCH_BUFFER_NAME},
     editor::Action,
     info::Info,
     input::KeyEvent,
@@ -467,6 +467,8 @@ impl MappableCommand {
         extend_to_line_start, "Extend to line start",
         extend_to_first_nonwhitespace, "Extend to first non-blank in line",
         extend_to_line_end, "Extend to line end",
+        undo_selection, "Go to previous selection",
+        redo_selection, "Go to next selection",
         extend_to_line_end_newline, "Extend to line end",
         signature_help, "Show signature help",
         smart_tab, "Insert tab if all cursors have all whitespace to their left; otherwise, run a separate command.",
@@ -840,6 +842,18 @@ fn goto_line_end(cx: &mut Context) {
     )
 }
 
+fn undo_selection(cx: &mut Context) {
+    let count = cx.count();
+    let (view, doc) = current!(cx.editor);
+    doc.select_history(view.id, SelectionDirection::Undo(count));
+}
+
+fn redo_selection(cx: &mut Context) {
+    let count = cx.count();
+    let (view, doc) = current!(cx.editor);
+    doc.select_history(view.id, SelectionDirection::Redo(count));
+}
+
 fn extend_to_line_end(cx: &mut Context) {
     let (view, doc) = current!(cx.editor);
     goto_line_end_impl(view, doc, Movement::Extend)

helix-term/src/keymap/default.rs

@@ -86,6 +86,8 @@ pub fn default() -> HashMap<Mode, KeyTrie> {
         "S" => split_selection,
         ";" => collapse_selection,
         "A-;" => flip_selections,
+        "A-w" => redo_selection,
+        "A-k" => undo_selection,
         "A-o" | "A-up" => expand_selection,
         "A-i" | "A-down" => shrink_selection,
         "A-I" | "A-S-down" => select_all_children,

helix-view/src/document.rs

@@ -142,6 +142,7 @@ pub struct Document {
     pub(crate) id: DocumentId,
     text: Rope,
     selections: HashMap<ViewId, Selection>,
+    selections_history: HashMap<ViewId, SelectionHistory>,
     view_data: HashMap<ViewId, ViewData>,
     pub active_snippet: Option<ActiveSnippet>,
 
@@ -216,6 +217,33 @@ pub struct Document {
     syn_loader: Arc<ArcSwap<syntax::Loader>>,
 }
 
+#[derive(Debug, PartialEq, Eq)]
+pub enum SelectionDirection {
+    Undo(usize),
+    Redo(usize),
+}
+
+#[derive(Debug)]
+pub struct SelectionHistory {
+    selections: Vec<Selection>,
+    current: usize,
+}
+
+impl SelectionHistory {
+    pub fn goto(&mut self, direction: SelectionDirection) -> Option<&Selection> {
+        let mut position = match direction {
+            SelectionDirection::Undo(count) => self.current.checked_sub(count)?,
+            SelectionDirection::Redo(count) => self.current.checked_add(count)?,
+        };
+        let max = self.selections.len() - 1;
+        if position > max {
+            position = max
+        }
+        self.current = position;
+        self.selections.get(self.current)
+    }
+}
+
 #[derive(Debug, Clone, Default)]
 pub struct DocumentColorSwatches {
     pub color_swatches: Vec<InlineAnnotation>,
@@ -300,6 +328,7 @@ impl fmt::Debug for Document {
             .field("inlay_hints_oudated", &self.inlay_hints_oudated)
             .field("text_annotations", &self.inlay_hints)
             .field("view_data", &self.view_data)
+            .field("selections_history", &self.selections_history)
             .field("path", &self.path)
             .field("encoding", &self.encoding)
             .field("restore_cursor", &self.restore_cursor)
@@ -700,6 +729,7 @@ impl Document {
             has_bom,
             text,
             selections: HashMap::default(),
+            selections_history: HashMap::default(),
             inlay_hints: HashMap::default(),
             inlay_hints_oudated: false,
             view_data: Default::default(),
@@ -1320,17 +1350,43 @@ impl Document {
         Ok(())
     }
 
-    /// Select text within the [`Document`].
-    pub fn set_selection(&mut self, view_id: ViewId, selection: Selection) {
+    fn select(&mut self, view_id: ViewId, selection: Selection) {
         // TODO: use a transaction?
-        self.selections
-            .insert(view_id, selection.ensure_invariants(self.text().slice(..)));
+        self.selections.insert(view_id, selection);
         helix_event::dispatch(SelectionDidChange {
             doc: self,
             view: view_id,
         })
     }
 
+    /// Select text within the [`Document`].
+    pub fn set_selection(&mut self, view_id: ViewId, selection: Selection) {
+        // TODO: use a transaction?
+        let selection = selection.ensure_invariants(self.text().slice(..));
+        self.save_selection_to_history(view_id, selection.clone());
+        self.select(view_id, selection);
+    }
+
+    fn save_selection_to_history(&mut self, view_id: ViewId, selection: Selection) {
+        let entry = self
+            .selections_history
+            .entry(view_id)
+            .or_insert(SelectionHistory {
+                selections: vec![],
+                current: 0,
+            });
+        entry.selections.push(selection);
+        entry.current = entry.selections.len() - 1;
+    }
+
+    pub fn select_history(&mut self, view_id: ViewId, direction: SelectionDirection) {
+        self.selections_history
+            .get_mut(&view_id)
+            .and_then(|history| history.goto(direction).cloned())
+            .into_iter()
+            .for_each(|selection| self.select(view_id, selection));
+    }
+
     /// Find the origin selection of the text in a document, i.e. where
     /// a single cursor would go if it were on the first grapheme. If
     /// the text is empty, returns (0, 0).
@@ -1367,6 +1423,7 @@ impl Document {
     /// Remove a view's selection and inlay hints from this document.
     pub fn remove_view(&mut self, view_id: ViewId) {
         self.selections.remove(&view_id);
+        self.selections_history.remove(&view_id);
         self.inlay_hints.remove(&view_id);
         self.jump_labels.remove(&view_id);
     }
@@ -1412,6 +1469,9 @@ impl Document {
                 .ensure_invariants(self.text.slice(..));
         }
 
+        // Reset the selection history after any change
+        self.selections_history.clear();
+
         for view_data in self.view_data.values_mut() {
             view_data.view_position.anchor = transaction
                 .changes()