Made ToC auto-expanding

src/lib/components/publications/Publication.svelte

@@ -182,7 +182,7 @@
       },
       { threshold: 0.5 },
     );
-    loadMore(8);
+    loadMore(12);
 
     return () => {
       observer.disconnect();
@@ -210,6 +210,11 @@
         depth={2}
         onSectionFocused={(address: string) =>
           publicationTree.setBookmark(address)}
+        onLoadMore={() => {
+          if (!isLoading && !isDone) {
+            loadMore(4);
+          }
+        }}
       />
     </Sidebar>
   {/if}

src/lib/components/publications/TableOfContents.svelte

@@ -12,10 +12,11 @@
   import Self from "./TableOfContents.svelte";
   import { onMount, onDestroy } from "svelte";
 
-  let { depth, onSectionFocused } = $props<{
+  let { depth, onSectionFocused, onLoadMore } = $props<{
     rootAddress: string;
     depth: number;
     onSectionFocused?: (address: string) => void;
+    onLoadMore?: () => void;
   }>();
 
   let toc = getContext("toc") as TableOfContents;
@@ -58,6 +59,14 @@
     }
     
     onSectionFocused?.(address);
+    
+    // Check if this is the last entry and trigger loading more events
+    const currentEntries = entries;
+    const lastEntry = currentEntries[currentEntries.length - 1];
+    if (lastEntry && lastEntry.address === address) {
+      console.debug('[TableOfContents] Last entry clicked, triggering load more');
+      onLoadMore?.();
+    }
   }
 
   // Check if an entry is currently visible
@@ -145,27 +154,28 @@
 <!-- TODO: Figure out how to style indentations. -->
 <!-- TODO: Make group title fonts the same as entry title fonts. -->
 <SidebarGroup>
-  {#each entries as entry}
+  {#each entries as entry, index}
     {@const address = entry.address}
     {@const expanded = toc.expandedMap.get(address) ?? false}
     {@const isLeaf = toc.leaves.has(address)}
     {@const isVisible = isEntryVisible(address)}
+    {@const isLastEntry = index === entries.length - 1}
     {#if isLeaf}
       <SidebarItem
         label={entry.title}
         href={`#${address}`}
         spanClass="px-2 text-ellipsis"
-        class={isVisible ? "toc-highlight" : ""}
+        class={`${isVisible ? "toc-highlight" : ""} ${isLastEntry ? "pb-4" : ""}`}
         onclick={() => handleSectionClick(address)}
       />
     {:else}
       {@const childDepth = depth + 1}
       <SidebarDropdownWrapper
         label={entry.title}
-        btnClass="flex items-center p-2 w-full font-normal text-gray-900 rounded-lg transition duration-75 group hover:bg-primary-50 dark:text-white dark:hover:bg-primary-800 {isVisible ? 'toc-highlight' : ''}"
+        btnClass="flex items-center p-2 w-full font-normal text-gray-900 rounded-lg transition duration-75 group hover:bg-primary-50 dark:text-white dark:hover:bg-primary-800 {isVisible ? 'toc-highlight' : ''} {isLastEntry ? 'pb-4' : ''}"
         bind:isOpen={() => expanded, (open) => setEntryExpanded(address, open)}
       >
-        <Self rootAddress={address} depth={childDepth} {onSectionFocused} />
+        <Self rootAddress={address} depth={childDepth} {onSectionFocused} {onLoadMore} />
       </SidebarDropdownWrapper>
     {/if}
   {/each}

src/lib/data_structures/publication_tree.ts

@@ -46,6 +46,11 @@ export class PublicationTree implements AsyncIterable<NDKEvent | null> {
    */
   #events: Map<string, NDKEvent>;
   
+  /**
+   * Simple cache for fetched events to avoid re-fetching.
+   */
+  #eventCache: Map<string, NDKEvent> = new Map();
+
   /**
    * An ordered list of the addresses of the leaves of the tree.
    */
@@ -589,13 +594,11 @@ export class PublicationTree implements AsyncIterable<NDKEvent | null> {
       }
 
       // Augment the tree with the children of the current event.
-      for (const childAddress of currentChildAddresses) {
-        if (this.#nodes.has(childAddress)) {
-          continue;
-        }
+      const childPromises = currentChildAddresses
+        .filter(childAddress => !this.#nodes.has(childAddress))
+        .map(childAddress => this.#addNode(childAddress, currentNode!));
       
-        await this.#addNode(childAddress, currentNode!);
-      }
+      await Promise.all(childPromises);
 
       // Push the popped address's children onto the stack for the next iteration.
       while (currentChildAddresses.length > 0) {
@@ -630,13 +633,24 @@ export class PublicationTree implements AsyncIterable<NDKEvent | null> {
     address: string,
     parentNode: PublicationTreeNode,
   ): Promise<PublicationTreeNode> {
+    // Check cache first
+    let event = this.#eventCache.get(address);
+    
+    if (!event) {
       const [kind, pubkey, dTag] = address.split(":");
-    const event = await this.#ndk.fetchEvent({
+      const fetchedEvent = await this.#ndk.fetchEvent({
         kinds: [parseInt(kind)],
         authors: [pubkey],
         "#d": [dTag],
       });
       
+      // Cache the event if found
+      if (fetchedEvent) {
+        this.#eventCache.set(address, fetchedEvent);
+        event = fetchedEvent;
+      }
+    }
+
     if (!event) {
       console.debug(
         `[PublicationTree] Event with address ${address} not found.`,
@@ -665,9 +679,10 @@ export class PublicationTree implements AsyncIterable<NDKEvent | null> {
       children: [],
     };
 
-    for (const address of childAddresses) {
-      this.addEventByAddress(address, event);
-    }
+    const childPromises = childAddresses.map(address => 
+      this.addEventByAddress(address, event)
+    );
+    await Promise.all(childPromises);
 
     this.#nodeResolvedObservers.forEach((observer) => observer(address));