Function createViewSession

packages/app/src/context/file/view-cache.ts:37–121

(scope: ServerScope, dir: string, id: string | undefined)

}

function createViewSession(scope: ServerScope, dir: string, id: string | undefined) {
  const legacyViewKey = `${dir}/file${id ? "/" + id : ""}.v1`

  const [view, setView, _, ready] = persisted(
    Persist.serverScoped(scope, dir, id, "file-view", [legacyViewKey]),
    createStore<{
      file: Record<string, FileViewState>
    }>({
      file: {},
    }),
  )

  const meta = { pruned: false }

  const pruneView = (keep?: string) => {
    const keys = Object.keys(view.file)
    if (keys.length <= MAX_VIEW_FILES) return

    const drop = keys.filter((key) => key !== keep).slice(0, keys.length - MAX_VIEW_FILES)
    if (drop.length === 0) return

    setView(
      produce((draft) => {
        for (const key of drop) {
          delete draft.file[key]
        }
      }),
    )
  }

  createEffect(() => {
    if (!ready()) return
    if (meta.pruned) return
    meta.pruned = true
    pruneView()
  })

  const scrollTop = (path: string) => view.file[path]?.scrollTop
  const scrollLeft = (path: string) => view.file[path]?.scrollLeft
  const selectedLines = (path: string) => view.file[path]?.selectedLines

  const setScrollTop = (path: string, top: number) => {
    setView(
      produce((draft) => {
        const file = draft.file[path] ?? (draft.file[path] = {})
        if (file.scrollTop === top) return
        file.scrollTop = top
      }),
    )
    pruneView(path)
  }

  const setScrollLeft = (path: string, left: number) => {
    setView(
      produce((draft) => {
        const file = draft.file[path] ?? (draft.file[path] = {})
        if (file.scrollLeft === left) return
        file.scrollLeft = left