[Init] Initial commit - NetMesh terminal manager

components/terminal/runtime/optionArrowWordJump.ts

@@ -0,0 +1,33 @@
+export interface OptionArrowKeyEvent {
+  key: string;
+  altKey: boolean;
+  ctrlKey: boolean;
+  metaKey: boolean;
+  shiftKey: boolean;
+}
+
+/**
+ * macOS Option+←/→ word-jump (discussion #826).
+ *
+ * When enabled, maps a bare Option+Left/Right to the Meta-b / Meta-f sequence so
+ * readline/zle does backward-word / forward-word without per-host bindkey setup.
+ * Returns the bytes to send, or null when the mapping doesn't apply (disabled,
+ * non-macOS, not an arrow, or other modifiers held) — in which case xterm's
+ * default ^[[1;3D / ^[[1;3C is left untouched.
+ *
+ * Gated to macOS (`isMac`): the setting is syncable, so without the gate,
+ * enabling it on a Mac would also rewrite Alt+←/→ on synced Linux/Windows
+ * devices (discussion #826 review).
+ */
+export function optionArrowWordJumpSequence(
+  e: OptionArrowKeyEvent,
+  enabled: boolean,
+  isMac: boolean,
+): string | null {
+  if (!enabled || !isMac) return null;
+  // Only a bare Option+Arrow — leave Shift/Ctrl/Cmd combos to xterm's defaults.
+  if (!e.altKey || e.ctrlKey || e.metaKey || e.shiftKey) return null;
+  if (e.key === "ArrowLeft") return "\x1bb"; // Meta-b → backward-word
+  if (e.key === "ArrowRight") return "\x1bf"; // Meta-f → forward-word
+  return null;
+}