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a tool for shared writing and social publishing
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172"use client";import { createContext, useContext, useEffect } from "react";import { useEntity, useReplicache } from "src/replicache";import { useIdentityData } from "components/IdentityProvider";import { useUIState } from "src/useUIState";
// The editor route resolves identity only after mount, so its server render// wouldn't know whose root/collapsed-blocks fact to read; the page resolves// the session cookie to a DID server-side and passes it here, letting SSR,// hydration, and the first paint all render the viewer's fold state from// initialFacts.const ServerDid = createContext<string | null>(null);
// The viewer's root/collapsed-blocks fact. `did` is null for signed-out and// read-only viewers, whose fold state stays on the ephemeral store: their fact// writes are dropped server-side and would revert on pull.function useMyFoldFact() { let serverDid = useContext(ServerDid); let { identity } = useIdentityData(); let { rootEntity, permission_token } = useReplicache(); let canWrite = permission_token.permission_token_rights?.some((r) => r.write); let did = canWrite ? identity?.atp_did ?? serverDid : null; let facts = useEntity(did ? rootEntity : null, "root/collapsed-blocks"); return { did, rootEntity, fact: did ? facts.find((f) => f.author_did === did) : undefined, };}
const empty: string[] = [];export function useFoldedBlocks(): readonly string[] { let { did, fact } = useMyFoldFact(); let store = useUIState((s) => s.foldedBlocks); return did ? fact?.data.value ?? empty : store;}
export function useIsFolded(entityID: string) { return useFoldedBlocks().includes(entityID);}
export function FoldStateProvider(props: { serverDid?: string | null; children: React.ReactNode;}) { return ( <ServerDid.Provider value={props.serverDid ?? null}> <FoldMirrorSync /> {props.children} </ServerDid.Provider> );}
// Event-time code (keymaps, selection, move and list operations) reads// foldedBlocks synchronously from the zustand store; keep it mirroring the// signed-in user's fact.function FoldMirrorSync() { let { did, rootEntity, fact } = useMyFoldFact(); let serialized = JSON.stringify(fact?.data.value ?? []); useEffect(() => { if (!did) return; let value = JSON.parse(serialized) as string[]; let current = useUIState.getState().foldedBlocks; if ( value.length !== current.length || !value.every((v) => current.includes(v)) ) useUIState.setState({ foldedBlocks: value }); }, [serialized, did, rootEntity]); return null;}