Function TextViewer

packages/session-ui/src/components/file.tsx:704–915

(props: TextFileProps<T>)

// ---------------------------------------------------------------------------

function TextViewer<T>(props: TextFileProps<T>) {
  let instance: PierreFile<T> | VirtualizedFile<T> | undefined
  let viewer!: Viewer

  const [local, others] = splitProps(props, textKeys)

  const text = () => {
    const value = local.file.contents as unknown
    if (typeof value === "string") return value
    if (Array.isArray(value)) return value.join("\n")
    if (value == null) return ""
    // oxlint-disable-next-line no-base-to-string -- file contents cast to unknown, coercion is intentional
    return String(value)
  }

  const lineCount = () => {
    const value = text()
    const total = value.split("\n").length - (value.endsWith("\n") ? 1 : 0)
    return Math.max(1, total)
  }

  const bytes = createMemo(() => {
    const value = local.file.contents as unknown
    if (typeof value === "string") return value.length
    if (Array.isArray(value)) {
      return value.reduce(
        // oxlint-disable-next-line no-base-to-string -- array parts coerced intentionally
        (sum, part) => sum + (typeof part === "string" ? part.length + 1 : String(part).length + 1),
        0,
      )
    }
    if (value == null) return 0
    // oxlint-disable-next-line no-base-to-string -- file contents cast to unknown, coercion is intentional
    return String(value).length
  })

  const virtual = createMemo(() => bytes() > VIRTUALIZE_BYTES)

  const virtuals = createLocalVirtualStrategy(() => viewer.wrapper, virtual)

  const lineFromMouseEvent = (event: MouseEvent): MouseHit => mouseHit(event, parseLine)

  const applySelection = (range: SelectedLineRange | null) => {
    const current = instance
    if (!current) return false

    if (virtual()) {
      current.setSelectedLines(range)
      return true
    }

    const root = viewer.getRoot()
    if (!root) return false

    const total = lineCount()
    if (root.querySelectorAll("[data-line]").length < total) return false

    if (!range) {