feat: fork ink and make it work nicely

ui-tui/packages/hermes-ink/src/ink/wrap-text.ts

@@ -0,0 +1,75 @@
+import sliceAnsi from '../utils/sliceAnsi.js'
+
+import { stringWidth } from './stringWidth.js'
+import type { Styles } from './styles.js'
+import { wrapAnsi } from './wrapAnsi.js'
+
+const ELLIPSIS = '…'
+
+// sliceAnsi may include a boundary-spanning wide char (e.g. CJK at position
+// end-1 with width 2 overshoots by 1). Retry with a tighter bound once.
+function sliceFit(text: string, start: number, end: number): string {
+  const s = sliceAnsi(text, start, end)
+
+  return stringWidth(s) > end - start ? sliceAnsi(text, start, end - 1) : s
+}
+
+function truncate(text: string, columns: number, position: 'start' | 'middle' | 'end'): string {
+  if (columns < 1) {
+    return ''
+  }
+
+  if (columns === 1) {
+    return ELLIPSIS
+  }
+
+  const length = stringWidth(text)
+
+  if (length <= columns) {
+    return text
+  }
+
+  if (position === 'start') {
+    return ELLIPSIS + sliceFit(text, length - columns + 1, length)
+  }
+
+  if (position === 'middle') {
+    const half = Math.floor(columns / 2)
+
+    return sliceFit(text, 0, half) + ELLIPSIS + sliceFit(text, length - (columns - half) + 1, length)
+  }
+
+  return sliceFit(text, 0, columns - 1) + ELLIPSIS
+}
+
+export default function wrapText(text: string, maxWidth: number, wrapType: Styles['textWrap']): string {
+  if (wrapType === 'wrap') {
+    return wrapAnsi(text, maxWidth, {
+      trim: false,
+      hard: true
+    })
+  }
+
+  if (wrapType === 'wrap-trim') {
+    return wrapAnsi(text, maxWidth, {
+      trim: true,
+      hard: true
+    })
+  }
+
+  if (wrapType!.startsWith('truncate')) {
+    let position: 'end' | 'middle' | 'start' = 'end'
+
+    if (wrapType === 'truncate-middle') {
+      position = 'middle'
+    }
+
+    if (wrapType === 'truncate-start') {
+      position = 'start'
+    }
+
+    return truncate(text, maxWidth, position)
+  }
+
+  return text
+}