228 lines
9.0 KiB
JavaScript
228 lines
9.0 KiB
JavaScript
import { Map as ImmutableMap, List as ImmutableList, OrderedSet as ImmutableOrderedSet, fromJS } from 'immutable';
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import {
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blockAccountSuccess,
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muteAccountSuccess,
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unfollowAccountSuccess
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} from '../actions/accounts';
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import {
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TIMELINE_UPDATE,
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TIMELINE_DELETE,
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TIMELINE_CLEAR,
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TIMELINE_EXPAND_SUCCESS,
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TIMELINE_EXPAND_REQUEST,
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TIMELINE_EXPAND_FAIL,
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TIMELINE_SCROLL_TOP,
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TIMELINE_CONNECT,
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TIMELINE_DISCONNECT,
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TIMELINE_LOAD_PENDING,
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TIMELINE_MARK_AS_PARTIAL,
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} from '../actions/timelines';
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import { compareId } from '../compare_id';
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const initialState = ImmutableMap();
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const initialTimeline = ImmutableMap({
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unread: 0,
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online: false,
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top: true,
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isLoading: false,
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hasMore: true,
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pendingItems: ImmutableList(),
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items: ImmutableList(),
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});
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const expandNormalizedTimeline = (state, timeline, statuses, next, isPartial, isLoadingRecent, usePendingItems) => {
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// This method is pretty tricky because:
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// - existing items in the timeline might be out of order
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// - the existing timeline may have gaps, most often explicitly noted with a `null` item
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// - ideally, we don't want it to reorder existing items of the timeline
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// - `statuses` may include items that are already included in the timeline
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// - this function can be called either to fill in a gap, or load newer items
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return state.update(timeline, initialTimeline, map => map.withMutations(mMap => {
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mMap.set('isLoading', false);
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mMap.set('isPartial', isPartial);
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if (!next && !isLoadingRecent) mMap.set('hasMore', false);
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if (timeline.endsWith(':pinned')) {
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mMap.set('items', statuses.map(status => status.get('id')));
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} else if (!statuses.isEmpty()) {
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usePendingItems = isLoadingRecent && (usePendingItems || !mMap.get('pendingItems').isEmpty());
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mMap.update(usePendingItems ? 'pendingItems' : 'items', ImmutableList(), oldIds => {
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const newIds = statuses.map(status => status.get('id'));
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// Now this gets tricky, as we don't necessarily know for sure where the gap to fill is
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// and some items in the timeline may not be properly ordered.
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// However, we know that `newIds.last()` is the oldest item that was requested and that
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// there is no “hole” between `newIds.last()` and `newIds.first()`.
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// First, find the furthest (if properly sorted, oldest) item in the timeline that is
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// newer than the oldest fetched one, as it's most likely that it delimits the gap.
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// Start the gap *after* that item.
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const lastIndex = oldIds.findLastIndex(id => id !== null && compareId(id, newIds.last()) >= 0) + 1;
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// Then, try to find the furthest (if properly sorted, oldest) item in the timeline that
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// is newer than the most recent fetched one, as it delimits a section comprised of only
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// items older or within `newIds` (or that were deleted from the server, so should be removed
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// anyway).
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// Stop the gap *after* that item.
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const firstIndex = oldIds.take(lastIndex).findLastIndex(id => id !== null && compareId(id, newIds.first()) > 0) + 1;
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let insertedIds = ImmutableOrderedSet(newIds).withMutations(insertedIds => {
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// It is possible, though unlikely, that the slice we are replacing contains items older
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// than the elements we got from the API. Get them and add them back at the back of the
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// slice.
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const olderIds = oldIds.slice(firstIndex, lastIndex).filter(id => id !== null && compareId(id, newIds.last()) < 0);
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insertedIds.union(olderIds);
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// Make sure we aren't inserting duplicates
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insertedIds.subtract(oldIds.take(firstIndex), oldIds.skip(lastIndex));
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}).toList();
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// Finally, insert a gap marker if the data is marked as partial by the server
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if (isPartial && (firstIndex === 0 || oldIds.get(firstIndex - 1) !== null)) {
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insertedIds = insertedIds.unshift(null);
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}
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return oldIds.take(firstIndex).concat(
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insertedIds,
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oldIds.skip(lastIndex),
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);
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});
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}
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}));
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};
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const updateTimeline = (state, timeline, status, usePendingItems) => {
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const top = state.getIn([timeline, 'top']);
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if (usePendingItems || !state.getIn([timeline, 'pendingItems']).isEmpty()) {
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if (state.getIn([timeline, 'pendingItems'], ImmutableList()).includes(status.get('id')) || state.getIn([timeline, 'items'], ImmutableList()).includes(status.get('id'))) {
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return state;
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}
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return state.update(timeline, initialTimeline, map => map.update('pendingItems', list => list.unshift(status.get('id'))).update('unread', unread => unread + 1));
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}
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const ids = state.getIn([timeline, 'items'], ImmutableList());
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const includesId = ids.includes(status.get('id'));
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const unread = state.getIn([timeline, 'unread'], 0);
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if (includesId) {
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return state;
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}
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let newIds = ids;
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return state.update(timeline, initialTimeline, map => map.withMutations(mMap => {
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if (!top) mMap.set('unread', unread + 1);
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if (top && ids.size > 40) newIds = newIds.take(20);
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mMap.set('items', newIds.unshift(status.get('id')));
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}));
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};
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const deleteStatus = (state, id, references, exclude_account = null) => {
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state.keySeq().forEach(timeline => {
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if (exclude_account === null || (timeline !== `account:${exclude_account}` && !timeline.startsWith(`account:${exclude_account}:`))) {
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const helper = list => list.filterNot(item => item === id);
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state = state.updateIn([timeline, 'items'], helper).updateIn([timeline, 'pendingItems'], helper);
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}
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});
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// Remove reblogs of deleted status
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references.forEach(ref => {
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state = deleteStatus(state, ref, [], exclude_account);
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});
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return state;
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};
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const clearTimeline = (state, timeline) => {
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return state.set(timeline, initialTimeline);
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};
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const filterTimelines = (state, relationship, statuses) => {
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let references;
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statuses.forEach(status => {
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if (status.get('account') !== relationship.id) {
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return;
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}
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references = statuses.filter(item => item.get('reblog') === status.get('id')).map(item => item.get('id'));
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state = deleteStatus(state, status.get('id'), references, relationship.id);
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});
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return state;
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};
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const filterTimeline = (timeline, state, relationship, statuses) => {
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const helper = list => list.filterNot(statusId => statuses.getIn([statusId, 'account']) === relationship.id);
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return state.updateIn([timeline, 'items'], ImmutableList(), helper).updateIn([timeline, 'pendingItems'], ImmutableList(), helper);
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};
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const updateTop = (state, timeline, top) => {
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return state.update(timeline, initialTimeline, map => map.withMutations(mMap => {
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if (top) mMap.set('unread', mMap.get('pendingItems').size);
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mMap.set('top', top);
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}));
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};
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const reconnectTimeline = (state, usePendingItems) => {
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if (state.get('online')) {
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return state;
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}
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return state.withMutations(mMap => {
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mMap.update(usePendingItems ? 'pendingItems' : 'items', items => items.first() ? items.unshift(null) : items);
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mMap.set('online', true);
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});
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};
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export default function timelines(state = initialState, action) {
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switch(action.type) {
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case TIMELINE_LOAD_PENDING:
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return state.update(action.timeline, initialTimeline, map =>
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map.update('items', list => map.get('pendingItems').concat(list.take(40))).set('pendingItems', ImmutableList()).set('unread', 0));
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case TIMELINE_EXPAND_REQUEST:
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return state.update(action.timeline, initialTimeline, map => map.set('isLoading', true));
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case TIMELINE_EXPAND_FAIL:
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return state.update(action.timeline, initialTimeline, map => map.set('isLoading', false));
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case TIMELINE_EXPAND_SUCCESS:
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return expandNormalizedTimeline(state, action.timeline, fromJS(action.statuses), action.next, action.partial, action.isLoadingRecent, action.usePendingItems);
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case TIMELINE_UPDATE:
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return updateTimeline(state, action.timeline, fromJS(action.status), action.usePendingItems);
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case TIMELINE_DELETE:
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return deleteStatus(state, action.id, action.references, action.reblogOf);
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case TIMELINE_CLEAR:
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return clearTimeline(state, action.timeline);
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case blockAccountSuccess.type:
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case muteAccountSuccess.type:
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return filterTimelines(state, action.payload.relationship, action.payload.statuses);
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case unfollowAccountSuccess.type:
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return filterTimeline('home', state, action.payload.relationship, action.payload.statuses);
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case TIMELINE_SCROLL_TOP:
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return updateTop(state, action.timeline, action.top);
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case TIMELINE_CONNECT:
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return state.update(action.timeline, initialTimeline, map => reconnectTimeline(map, action.usePendingItems));
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case TIMELINE_DISCONNECT:
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return state.update(
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action.timeline,
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initialTimeline,
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map => map.set('online', false).update(action.usePendingItems ? 'pendingItems' : 'items', items => items.first() ? items.unshift(null) : items),
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);
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case TIMELINE_MARK_AS_PARTIAL:
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return state.update(
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action.timeline,
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initialTimeline,
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map => map.set('isPartial', true).set('items', ImmutableList()).set('pendingItems', ImmutableList()).set('unread', 0),
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);
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default:
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return state;
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}
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}
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