[Init] Initial commit - NetMesh terminal manager

components/terminal/runtime/optionYankLastArg.ts

@@ -0,0 +1,37 @@
+export interface OptionYankLastArgKeyEvent {
+  key: string;
+  code?: string;
+  altKey: boolean;
+  ctrlKey: boolean;
+  metaKey: boolean;
+  shiftKey: boolean;
+}
+
+const isPeriodKey = (e: OptionYankLastArgKeyEvent): boolean => (
+  e.code === "Period" || e.key === "." || e.key === "≥"
+);
+
+const isUnderscoreKey = (e: OptionYankLastArgKeyEvent): boolean => (
+  e.key === "_" || (e.code === "Minus" && e.shiftKey)
+);
+
+/**
+ * macOS Option+. / Option+_ → readline yank-last-arg (issue #2364).
+ *
+ * Ghostty/iTerm2/kitty/VS Code do not implement this themselves — they pass
+ * Meta-. through to bash/zsh. On macOS, Option+. types "≥" unless Option is
+ * Meta, so map those two physical keys to ESC+. / ESC+_ without turning every
+ * Option chord into Meta (unlike `altAsMeta`).
+ *
+ * Gated to macOS: Linux/Windows Alt+. already sends the ESC prefix via xterm.
+ */
+export function optionYankLastArgSequence(
+  e: OptionYankLastArgKeyEvent,
+  isMac: boolean,
+): string | null {
+  if (!isMac) return null;
+  if (!e.altKey || e.ctrlKey || e.metaKey) return null;
+  if (isPeriodKey(e) && !e.shiftKey) return "\x1b.";
+  if (isUnderscoreKey(e)) return "\x1b_";
+  return null;
+}