Function useHistorySearch

src/hooks/useHistorySearch.ts:15–303

(
  onAcceptHistory: (entry: HistoryEntry) => void,
  currentInput: string,
  onInputChange: (input: string) => void,
  onCursorChange: (cursorOffset: number) => void,
  currentCursorOffset: number,
  onModeChange: (mode: PromptInputMode) => void,
  currentMode: PromptInputMode,
  isSearching: boolean,
  setIsSearching: (isSearching: boolean) => void,
  setPastedContents: (pastedContents: HistoryEntry['pastedContents']) => void,
  currentPastedContents: HistoryEntry['pastedContents'],
)

import type { HistoryEntry } from '../utils/config.js'

export function useHistorySearch(
  onAcceptHistory: (entry: HistoryEntry) => void,
  currentInput: string,
  onInputChange: (input: string) => void,
  onCursorChange: (cursorOffset: number) => void,
  currentCursorOffset: number,
  onModeChange: (mode: PromptInputMode) => void,
  currentMode: PromptInputMode,
  isSearching: boolean,
  setIsSearching: (isSearching: boolean) => void,
  setPastedContents: (pastedContents: HistoryEntry['pastedContents']) => void,
  currentPastedContents: HistoryEntry['pastedContents'],
): {
  historyQuery: string
  setHistoryQuery: (query: string) => void
  historyMatch: HistoryEntry | undefined
  historyFailedMatch: boolean
  handleKeyDown: (e: KeyboardEvent) => void
} {
  const [historyQuery, setHistoryQuery] = useState('')
  const [historyFailedMatch, setHistoryFailedMatch] = useState(false)
  const [originalInput, setOriginalInput] = useState('')
  const [originalCursorOffset, setOriginalCursorOffset] = useState(0)
  const [originalMode, setOriginalMode] = useState<PromptInputMode>('prompt')
  const [originalPastedContents, setOriginalPastedContents] = useState<
    HistoryEntry['pastedContents']
  >({})
  const [historyMatch, setHistoryMatch] = useState<HistoryEntry | undefined>(
    undefined,
  )
  const historyReader = useRef<AsyncGenerator<HistoryEntry> | undefined>(
    undefined,
  )
  const seenPrompts = useRef<Set<string>>(new Set())
  const searchAbortController = useRef<AbortController | null>(null)

  const closeHistoryReader = useCallback((): void => {
    if (historyReader.current) {
      // Must explicitly call .return() to trigger the finally block in readLinesReverse,
      // which closes the file handle. Without this, file descriptors leak.
      void historyReader.current.return(undefined)
      historyReader.current = undefined
    }
  }, [])

  const reset = useCallback((): void => {
    setIsSearching(false)
    setHistoryQuery('')
    setHistoryFailedMatch(false)
    setOriginalInput('')
    setOriginalCursorOffset(0)
    setOriginalMode('prompt')
    setOriginalPastedContents({})
    setHistoryMatch(undefined)
    closeHistoryReader()
    seenPrompts.current.clear()
  }, [setIsSearching, closeHistoryReader])