feat: fork ink and make it work nicely

ui-tui/packages/hermes-ink/src/ink/components/CursorDeclarationContext.ts

@@ -0,0 +1,28 @@
+import { createContext } from 'react'
+
+import type { DOMElement } from '../dom.js'
+
+export type CursorDeclaration = {
+  /** Display column (terminal cell width) within the declared node */
+  readonly relativeX: number
+  /** Line number within the declared node */
+  readonly relativeY: number
+  /** The ink-box DOMElement whose yoga layout provides the absolute origin */
+  readonly node: DOMElement
+}
+
+/**
+ * Setter for the declared cursor position.
+ *
+ * The optional second argument makes `null` a conditional clear: the
+ * declaration is only cleared if the currently-declared node matches
+ * `clearIfNode`. This makes the hook safe for sibling components
+ * (e.g. list items) that transfer focus among themselves — without the
+ * node check, a newly-unfocused item's clear could clobber a
+ * newly-focused sibling's set depending on layout-effect order.
+ */
+export type CursorDeclarationSetter = (declaration: CursorDeclaration | null, clearIfNode?: DOMElement | null) => void
+
+const CursorDeclarationContext = createContext<CursorDeclarationSetter>(() => {})
+
+export default CursorDeclarationContext