feat: closes #11553, add forked from message like merged into

public/language/en-GB/topic.json

@@ -79,6 +79,7 @@
 	"resolve-flag": "Resolve Flag",
 
 	"merged_message": "This topic has been merged into <a href=\"%1\">%2</a>",
+	"forked-message": "This topic was forked from <a href=\"%1\">%2</a>",
 	"deleted_message": "This topic has been deleted. Only users with topic management privileges can see it.",
 
 	"following_topic.message": "You will now be receiving notifications when somebody posts to this topic.",

public/openapi/read/topic/topic_id.yaml

@@ -315,6 +315,8 @@ get:
                     nullable: true
                   merger:
                     nullable: true
+                  forker:
+                    nullable: true
                   related:
                     type: array
                     items:

src/topics/fork.js

@@ -70,6 +70,9 @@ module.exports = function (Topics) {
 			Topics.setTopicFields(tid, {
 				upvotes: postData.upvotes,
 				downvotes: postData.downvotes,
+				forkedFromTid: fromTid,
+				forkerUid: uid,
+				forkTimestamp: Date.now(),
 			}),
 			db.sortedSetsAdd(['topics:votes', `cid:${cid}:tids:votes`], postData.votes, tid),
 			Topics.events.log(fromTid, { type: 'fork', uid, href: `/topic/${tid}` }),

src/topics/index.js

@@ -164,6 +164,7 @@ Topics.getTopicWithPosts = async function (topicData, set, uid, start, stop, rev
 		postSharing,
 		deleter,
 		merger,
+		forker,
 		related,
 		thumbs,
 		events,
@@ -177,6 +178,7 @@ Topics.getTopicWithPosts = async function (topicData, set, uid, start, stop, rev
 		social.getActivePostSharing(),
 		getDeleter(topicData),
 		getMerger(topicData),
+		getForker(topicData),
 		Topics.getRelatedTopics(topicData, uid),
 		Topics.thumbs.load([topicData]),
 		Topics.events.get(topicData.tid, uid, reverse),
@@ -211,6 +213,10 @@ Topics.getTopicWithPosts = async function (topicData, set, uid, start, stop, rev
 	if (merger) {
 		topicData.mergedTimestampISO = utils.toISOString(topicData.mergedTimestamp);
 	}
+	topicData.forker = forker;
+	if (forker) {
+		topicData.forkTimestampISO = utils.toISOString(topicData.forkTimestamp);
+	}
 	topicData.related = related || [];
 	topicData.unreplied = topicData.postcount === 1;
 	topicData.icons = [];
@@ -241,6 +247,21 @@ async function getMerger(topicData) {
 	return merger;
 }
 
+async function getForker(topicData) {
+	if (!parseInt(topicData.forkerUid, 10)) {
+		return null;
+	}
+	const [
+		forker,
+		forkedFromTitle,
+	] = await Promise.all([
+		user.getUserFields(topicData.forkerUid, ['username', 'userslug', 'picture']),
+		Topics.getTopicField(topicData.forkedFromTid, 'title'),
+	]);
+	forker.forkedFromTitle = forkedFromTitle;
+	return forker;
+}
+
 Topics.getMainPost = async function (tid, uid) {
 	const mainPosts = await Topics.getMainPosts([tid], uid);
 	return Array.isArray(mainPosts) && mainPosts.length ? mainPosts[0] : null;

src/views/partials/topic/forked-message.tpl

@@ -0,0 +1,6 @@
+<div component="topic/forked/message" class="alert alert-info mt-3 d-flex justify-content-between flex-wrap">
+	<span>[[topic:forked-message, {config.relative_path}/topic/{forkedFromTid}, {forker.forkedFromTitle}]]</span>
+	<span>
+		<a class="fw-bold" href="{config.relative_path}/user/{forker.userslug}">{forker.username}</strong></a> <small class="timeago" title="{forkTimestampISO}"></small>
+	</span>
+</div>

src/views/partials/topic/merged-message.tpl

@@ -1,4 +1,4 @@
-<div component="topic/merged/message" class="alert alert-warning mt-3 d-flex justify-content-between flex-wrap">
+<div component="topic/merged/message" class="alert alert-info mt-3 d-flex justify-content-between flex-wrap">
 	<span>[[topic:merged_message, {config.relative_path}/topic/{mergeIntoTid}, {merger.mergedIntoTitle}]]</span>
 	<span>
 		<a class="fw-bold" href="{config.relative_path}/user/{merger.userslug}">{merger.username}</strong></a> <small class="timeago" title="{mergedTimestampISO}"></small>