export function makePreparePostIdsForSearchPosts() {
const getMyPosts = makeGetPostsForIds();
return createIdsSelector(
(state, postIds) => getMyPosts(state, postIds),
getCurrentUser,
(posts, currentUser) => {
if (posts.length === 0 || !currentUser) {
return [];
}
const out = [];
for (let i = 0; i < posts.length; i++) {
const post = posts[i];
// give chance for the post to be loaded
if (!post) {
continue;
}
if (post.state === Posts.POST_DELETED && post.user_id === currentUser.id) {
continue;
}
// Render a date line for each post, even if displayed on the same date as the
// previous post. Since we don't deduplicate here like in other views, we need to
// ensure the resulting key is unique, even if the post timestamps (down to the
// second) are identical. The screens know to parse out the index before trying
// to consume the date value.
out.push(DATE_LINE + post.create_at + DATE_LINE_SUFFIX + i);
out.push(post.id);
}
return out;
}
);
}
export function makePreparePostIdsForPostList() {
const getMyPosts = makeGetPostsForIds();
return createIdsSelector(
(state, props) => getMyPosts(state, props.postIds),
(state) => state.entities.posts.selectedPostId,
(state, props) => props.lastViewedAt,
(state, props) => props.indicateNewMessages,
getCurrentUser,
shouldShowJoinLeaveMessages,
(posts, selectedPostId, lastViewedAt, indicateNewMessages, currentUser, showJoinLeave) => {
if (posts.length === 0 || !currentUser) {
return [];
}
const out = [];
let lastDate = null;
let addedNewMessagesIndicator = false;
// Iterating through the posts from oldest to newest
for (let i = posts.length - 1; i >= 0; i--) {
const post = posts[i];
if (
!post ||
(post.type === Posts.POST_TYPES.EPHEMERAL_ADD_TO_CHANNEL && !selectedPostId)
) {
continue;
}
// Filter out join/leave messages if necessary
if (shouldFilterJoinLeavePost(post, showJoinLeave, currentUser.username)) {
continue;
}
// Push on a date header if the last post was on a different day than the current one
const postDate = new Date(post.create_at);
postDate.setHours(0, 0, 0, 0);
if (!lastDate || lastDate.toDateString() !== postDate.toDateString()) {
out.push(DATE_LINE + postDate.getTime());
lastDate = postDate;
}
if (
lastViewedAt &&
post.create_at > lastViewedAt &&
post.user_id !== currentUser.id &&
!addedNewMessagesIndicator &&
indicateNewMessages
) {
out.push(START_OF_NEW_MESSAGES);
addedNewMessagesIndicator = true;
}
out.push(post.id);
}
// Flip it back to newest to oldest
return out.reverse();
}
);
}