paginated user comment screens

src/apps/web/WebData.h

@@ -595,11 +595,14 @@ struct UserEvents {
     };
 
     std::vector<EventCluster> eventClusterArr;
+    uint64_t totalEvents = 0;
+    std::optional<uint64_t> timestampCutoff;
+    std::optional<uint64_t> nextResumeTime;
 
-    UserEvents(lmdb::txn &txn, Decompressor &decomp, const std::string &pubkey) : u(txn, decomp, pubkey) {
+    UserEvents(lmdb::txn &txn, Decompressor &decomp, const std::string &pubkey, uint64_t resumeTime) : u(txn, decomp, pubkey) {
         flat_hash_map<std::string, EventCluster> eventClusters; // eventId (root) -> EventCluster
 
-        env.generic_foreachFull(txn, env.dbi_Event__pubkeyKind, makeKey_StringUint64Uint64(pubkey, 1, MAX_U64), "", [&](std::string_view k, std::string_view v){
+        env.generic_foreachFull(txn, env.dbi_Event__pubkeyKind, makeKey_StringUint64Uint64(pubkey, 1, resumeTime), "", [&](std::string_view k, std::string_view v){
             ParsedKey_StringUint64Uint64 parsedKey(k);
             if (parsedKey.s != pubkey || parsedKey.n1 != 1) return false;
 
@@ -617,6 +620,7 @@ struct UserEvents {
                 cluster.isRootEventFromUser = rootEvent.getPubkey() == u.pubkey;
                 cluster.rootEventTimestamp = rootEvent.getCreatedAt();
                 cluster.eventCache.emplace(rootId, std::move(rootEvent));
+                totalEvents++;
             };
 
             if (ev.root.size()) {
@@ -635,6 +639,7 @@ struct UserEvents {
                 }
 
                 eventClusters.at(ev.root).eventCache.emplace(id, std::move(ev));
+                totalEvents++;
             } else {
                 // Event is root
 
@@ -643,6 +648,15 @@ struct UserEvents {
                 }
             }
 
+            if (timestampCutoff) {
+                if (*timestampCutoff != parsedKey.n2) {
+                    nextResumeTime = *timestampCutoff - 1;
+                    return false;
+                }
+            } else if (totalEvents > 100) {
+                timestampCutoff = parsedKey.n2;
+            }
+
             return true;
         }, true);
 
@@ -666,9 +680,11 @@ struct UserEvents {
         struct {
             std::vector<TemplarResult> &renderedThreads;
             User &u;
+            std::optional<uint64_t> nextResumeTime;
         } ctx = {
             renderedThreads,
             u,
+            nextResumeTime,
         };
 
         return tmpl::user::comments(ctx);

src/apps/web/WebReader.cpp

@@ -217,7 +217,14 @@ HTTPResponse WebServer::generateReadResponse(lmdb::txn &txn, Decompressor &decom
             }
 
             if (u.path[2] == "notes") {
-                UserEvents uc(txn, decomp, userPubkey);
+                uint64_t resumeTime = MAX_U64;
+
+                try {
+                    auto resumeTimeStr = u.lookupQuery("next");
+                    if (resumeTimeStr) resumeTime = std::stoull(std::string(*resumeTimeStr));
+                } catch(...) {}
+
+                UserEvents uc(txn, decomp, userPubkey, resumeTime);
                 title = std::string("notes: ") + uc.u.username;
                 body = uc.render(txn, decomp);
             } else if (u.path[2] == "export.jsonl") {

src/apps/web/WebUtils.h

@@ -22,6 +22,34 @@ struct Url {
 
         if (u.size()) path.emplace_back(u);
     }
+
+    std::optional<std::string_view> lookupQuery(std::string_view key) {
+        std::string_view curr = query;
+
+        while (curr.size()) {
+            auto nextPos = curr.find("&");
+
+            {
+                std::string_view currKV = nextPos == std::string::npos ? curr : curr.substr(0, nextPos);
+                std::string_view k, v;
+
+                auto equalsPos = currKV.find("=");
+                if (equalsPos == std::string::npos) {
+                    k = currKV;
+                } else {
+                    k = currKV.substr(0, equalsPos);
+                    v = currKV.substr(equalsPos + 1);
+                }
+
+                if (k == key) return v;
+            }
+
+            if (nextPos == std::string::npos) break;
+            curr = curr.substr(nextPos + 1);
+        }
+
+        return std::nullopt;
+    }
 };
 
 inline std::string renderTimestamp(uint64_t now, uint64_t ts) {

src/apps/web/static/oddbean.css

@@ -180,9 +180,16 @@ table.vert {
 
 /* user comments */
 
-.user-comments > div {
+.user-comments {
+    .note-thread {
         margin-bottom: 30px;
         border-bottom: 1px solid black;
+    }
+
+    .more-notes {
+        margin-left: 20px;
+        margin-bottom: 20px;
+    }
 }
 
 

src/apps/web/tmpls/user/comments.tmpl

@@ -1,10 +1,14 @@
 <div class="user-comments">
-    <h2>
+    <h2 class="notes-header">
         Notes by <a href="/u/$(ctx.u.npubId)">$(ctx.u.username)</a>
         | <a href="/u/$(ctx.u.npubId)/export.jsonl">export</a>
     </h2>
 
-    <div> @(auto &r : ctx.renderedThreads)
+    <div class="note-thread"> @(auto &r : ctx.renderedThreads)
         $(r)
     </div>
+
+    <div class="more-notes"> ?(ctx.nextResumeTime)
+        <a href="/u/$(ctx.u.npubId)/notes?next=$(*ctx.nextResumeTime)">More notes by $(ctx.u.username)</a>
+    </div>
 </div>