feat: fork ink and make it work nicely

ui-tui/packages/hermes-ink/src/utils/sliceAnsi.ts

@@ -0,0 +1,58 @@
+import { type AnsiCode, ansiCodesToString, reduceAnsiCodes, tokenize, undoAnsiCodes } from '@alcalzone/ansi-tokenize'
+
+import { stringWidth } from '../ink/stringWidth.js'
+
+function isEndCode(code: AnsiCode): boolean {
+  return code.code === code.endCode
+}
+
+function filterStartCodes(codes: AnsiCode[]): AnsiCode[] {
+  return codes.filter(c => !isEndCode(c))
+}
+
+export default function sliceAnsi(str: string, start: number, end?: number): string {
+  const tokens = tokenize(str)
+  let activeCodes: AnsiCode[] = []
+  let position = 0
+  let result = ''
+  let include = false
+
+  for (const token of tokens) {
+    const width = token.type === 'ansi' ? 0 : token.fullWidth ? 2 : stringWidth(token.value)
+
+    if (end !== undefined && position >= end) {
+      if (token.type === 'ansi' || width > 0 || !include) {
+        break
+      }
+    }
+
+    if (token.type === 'ansi') {
+      activeCodes.push(token)
+
+      if (include) {
+        result += token.code
+      }
+    } else {
+      if (!include && position >= start) {
+        if (start > 0 && width === 0) {
+          continue
+        }
+
+        include = true
+        activeCodes = filterStartCodes(reduceAnsiCodes(activeCodes))
+        result = ansiCodesToString(activeCodes)
+      }
+
+      if (include) {
+        result += token.value
+      }
+
+      position += width
+    }
+  }
+
+  const activeStartCodes = filterStartCodes(reduceAnsiCodes(activeCodes))
+  result += ansiCodesToString(undoAnsiCodes(activeStartCodes))
+
+  return result
+}