diff options
Diffstat (limited to 'src/state/queries/post-thread.ts')
| -rw-r--r-- | src/state/queries/post-thread.ts | 21 |
1 files changed, 20 insertions, 1 deletions
diff --git a/src/state/queries/post-thread.ts b/src/state/queries/post-thread.ts index 93e3a5c3b..4784a9d75 100644 --- a/src/state/queries/post-thread.ts +++ b/src/state/queries/post-thread.ts @@ -237,7 +237,11 @@ export function sortThread( } } - if (opts.sort === 'oldest') { + if (opts.sort === 'hotness') { + const aHotness = getHotness(a.post) + const bHotness = getHotness(b.post) + return bHotness - aHotness + } else if (opts.sort === 'oldest') { return a.post.indexedAt.localeCompare(b.post.indexedAt) } else if (opts.sort === 'newest') { return b.post.indexedAt.localeCompare(a.post.indexedAt) @@ -269,6 +273,21 @@ export function sortThread( // internal methods // = +// Inspired by https://join-lemmy.org/docs/contributors/07-ranking-algo.html +// We want to give recent comments a real chance (and not bury them deep below the fold) +// while also surfacing well-liked comments from the past. In the future, we can explore +// something more sophisticated, but we don't have much data on the client right now. +function getHotness(post: AppBskyFeedDefs.PostView) { + const hoursAgo = + (new Date().getTime() - new Date(post.indexedAt).getTime()) / + (1000 * 60 * 60) + const likeCount = post.likeCount ?? 0 + const likeOrder = Math.log(3 + likeCount) + const timePenaltyExponent = 1.5 + 1.5 / (1 + Math.log(1 + likeCount)) + const timePenalty = Math.pow(hoursAgo + 2, timePenaltyExponent) + return likeOrder / timePenalty +} + function responseToThreadNodes( node: ThreadViewNode, depth = 0, |