wip: split Dance into Core & Kakoune

extensions/kakoune/LICENSE

@@ -0,0 +1,5 @@
+Copyright 2020-2025 Grégoire Geis
+
+Permission to use, copy, modify, and/or distribute this software for any purpose with or without fee is hereby granted, provided that the above copyright notice and this permission notice appear in all copies.
+
+THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

extensions/kakoune/README.md

@@ -0,0 +1,3 @@
+# Dance - Kakoune keybindings
+
+Kakoune keybindings for VS Code based on [Dance](https://github.com/71/dance).

src/state/extension.ts

@@ -11,6 +11,7 @@ import type { Commands } from "../commands";
 import { extensionName } from "../utils/constants";
 import { AutoDisposable } from "../utils/disposables";
 import { assert, CancellationError } from "../utils/errors";
+import { watchKeymaps } from "../utils/keymaps";
 import { SettingsValidator } from "../utils/settings-validator";
 import { onDidLoadTreeSitter, type TreeSitter } from "../utils/tree-sitter";
 
@@ -189,6 +190,9 @@ export class Extension implements vscode.Disposable {
 
     // Tree Sitter support.
     this._subscriptions.push(onDidLoadTreeSitter((treeSitter) => this._treeSitter = treeSitter));
+
+    // Sanity checks
+    this._subscriptions.push(watchKeymaps());
   }
 
   /**

src/utils/keymaps.ts

@@ -0,0 +1,64 @@
+import * as vscode from "vscode";
+
+/**
+ * Watches extensions, displaying warnings if potential conflicts are detected.
+ */
+export function watchKeymaps(): vscode.Disposable {
+  return vscode.extensions.onDidChange(checkKeymaps);
+}
+
+function checkKeymaps(): void {
+  /** Map from mode name to contributing extensions. */
+  const contributedModes = new Map<string, string[]>();
+  let hasConflict = false;
+
+  // Find extensions that contribute Dance modes.
+  for (const extension of vscode.extensions.all) {
+    const packageJSON = extension.packageJSON;
+    const modes = packageJSON?.contributes?.configurationDefaults
+      ?.["dance.modes"];
+
+    if (typeof modes !== "object") {
+      continue;
+    }
+
+    const extensionName = extension.packageJSON?.displayName ??
+      extension.packageJSON?.name;
+    const extensionDisplayName = extensionName === undefined
+      ? extension.id
+      : `${extensionName} (${extension.id})`;
+
+    for (const mode in modes) {
+      const existing = contributedModes.get(mode);
+
+      if (existing === undefined) {
+        contributedModes.set(mode, [extensionDisplayName]);
+      } else {
+        existing.push(extensionDisplayName);
+        hasConflict = true;
+      }
+    }
+  }
+
+  if (!hasConflict) {
+    return;
+  }
+
+  // Aggregate conflicting extensions.
+  const conflictingExtensions = new Set<string>();
+
+  for (const extensionNames of contributedModes.values()) {
+    if (extensionNames.length > 1) {
+      for (const extensionName of extensionNames) {
+        conflictingExtensions.add(extensionName);
+      }
+    }
+  }
+
+  // Display error message.
+  vscode.window.showWarningMessage(
+    `Multiple extensions contribute conflicting Dance modes: ${
+      Array.from(conflictingExtensions).sort().join(", ")
+    }`,
+  );
+}