[Init] Initial commit - NetMesh terminal manager

components/terminal/runtime/terminalCopyShortcut.ts

@@ -0,0 +1,45 @@
+type CopyShortcutKeyEvent = Pick<
+  KeyboardEvent,
+  "key" | "code" | "ctrlKey" | "shiftKey" | "altKey" | "metaKey"
+>;
+
+function isPhysicalCKey(e: CopyShortcutKeyEvent): boolean {
+  return e.key.toLowerCase() === "c" || e.code === "KeyC";
+}
+
+export function isPlainCtrlCInterruptChord(e: CopyShortcutKeyEvent): boolean {
+  return e.ctrlKey
+    && !e.shiftKey
+    && !e.altKey
+    && !e.metaKey
+    && isPhysicalCKey(e);
+}
+
+/** macOS Cmd+C / Super+C — forward when there is no xterm selection. */
+export function isPlainMetaCCopyChord(e: CopyShortcutKeyEvent): boolean {
+  return e.metaKey
+    && !e.ctrlKey
+    && !e.shiftKey
+    && !e.altKey
+    && isPhysicalCKey(e);
+}
+
+/**
+ * When copy matches with no xterm selection, pass the chord through instead of
+ * consuming an empty clipboard write.
+ *
+ * - Ctrl+C → SIGINT (or Kitty Ctrl+C)
+ * - Cmd+C → Kitty Super+C for nested TUIs (e.g. Herdr)
+ *
+ * Other no-selection copy bindings stay consumed as a safe no-op so keys like
+ * F5 / Ctrl+L are not forwarded to the remote (#1461).
+ */
+export function shouldPassThroughCopyShortcut(
+  action: string,
+  hasSelection: boolean,
+  e: CopyShortcutKeyEvent,
+): boolean {
+  return action === "copy"
+    && !hasSelection
+    && (isPlainCtrlCInterruptChord(e) || isPlainMetaCCopyChord(e));
+}