Added link for a quick search of untagged implications

src/content/listing.ts

@@ -3,8 +3,10 @@ import { createMediaBoxTools } from "$lib/components/MediaBoxTools";
 import { calculateMediaBoxesPositions, initializeMediaBox } from "$lib/components/MediaBoxWrapper";
 import { createMaintenanceStatusIcon } from "$lib/components/MaintenanceStatusIcon";
 import { createImageShowFullscreenButton } from "$lib/components/ImageShowFullscreenButton";
+import { initializeImageListContainer } from "$lib/components/listing/ImageListContainer";
 
 const mediaBoxes = document.querySelectorAll<HTMLElement>('.media-box');
+const imageListContainer = document.querySelector<HTMLElement>('#imagelist-container');
 
 mediaBoxes.forEach(mediaBoxElement => {
   initializeMediaBox(mediaBoxElement, [
@@ -22,3 +24,7 @@ mediaBoxes.forEach(mediaBoxElement => {
 });
 
 calculateMediaBoxesPositions(mediaBoxes);
+
+if (imageListContainer) {
+  initializeImageListContainer(imageListContainer);
+}

src/lib/components/listing/ImageListContainer.ts

@@ -0,0 +1,19 @@
+import { BaseComponent } from "$lib/components/base/BaseComponent";
+import { ImageListInfo } from "$lib/components/listing/ImageListInfo";
+
+export class ImageListContainer extends BaseComponent {
+  #info: ImageListInfo | null = null;
+
+  protected build() {
+    const imageListInfoContainer = this.container.querySelector<HTMLElement>('.js-imagelist-info');
+
+    if (imageListInfoContainer) {
+      this.#info = new ImageListInfo(imageListInfoContainer);
+      this.#info.initialize();
+    }
+  }
+}
+
+export function initializeImageListContainer(element: HTMLElement) {
+  new ImageListContainer(element).initialize();
+}

src/lib/components/listing/ImageListInfo.ts

@@ -0,0 +1,75 @@
+import { BaseComponent } from "$lib/components/base/BaseComponent";
+
+export class ImageListInfo extends BaseComponent {
+  #tagElement: HTMLElement | null = null;
+  #impliedTags: string[] = [];
+  #showUntaggedImplicationsButton: HTMLAnchorElement = document.createElement('a');
+
+  protected build() {
+    const sectionAfterImage = this.container.querySelector('.tag-info__image + .flex__grow');
+
+    this.#tagElement = sectionAfterImage?.querySelector<HTMLElement>('.tag.dropdown') ?? null;
+
+    const labels = this.container
+      .querySelectorAll<HTMLElement>('.tag-info__image + .flex__grow strong');
+
+    let targetElementToInsertBefore: HTMLElement | null = null;
+
+    for (const potentialListStarter of labels) {
+      if (potentialListStarter.innerText === ImageListInfo.#implicationsStarterText) {
+        targetElementToInsertBefore = potentialListStarter;
+        this.#collectImplicationsFromListStarter(potentialListStarter);
+        break;
+      }
+    }
+
+    if (this.#impliedTags.length && targetElementToInsertBefore) {
+      this.#showUntaggedImplicationsButton.href = '#';
+      this.#showUntaggedImplicationsButton.innerText = '(Q)';
+      this.#showUntaggedImplicationsButton.title =
+        'Query untagged implications\n\n' +
+        'This will open the search results with all untagged implications for the current tag.';
+      this.#showUntaggedImplicationsButton.classList.add('detail-link');
+
+      targetElementToInsertBefore.insertAdjacentElement('beforebegin', this.#showUntaggedImplicationsButton);
+    }
+  }
+
+  protected init() {
+    this.#showUntaggedImplicationsButton.addEventListener('click', this.#onShowUntaggedImplicationsClicked.bind(this));
+  }
+
+  #collectImplicationsFromListStarter(listStarter: HTMLElement) {
+    let targetElement: Element | null = listStarter.nextElementSibling;
+
+    while (targetElement) {
+      if (targetElement instanceof HTMLAnchorElement) {
+        this.#impliedTags.push(targetElement.innerText.trim());
+      }
+
+      // First line break is considered the end of the list.
+      if (targetElement instanceof HTMLBRElement) {
+        break;
+      }
+
+      targetElement = targetElement.nextElementSibling;
+    }
+  }
+
+  #onShowUntaggedImplicationsClicked(event: Event) {
+    event.preventDefault();
+
+    const url = new URL(window.location.href);
+
+    url.pathname = '/search';
+    url.search = '';
+
+    const currentTagName = this.#tagElement?.dataset.tagName;
+
+    url.searchParams.set('q', `${currentTagName}, !(${this.#impliedTags.join(", ")})`);
+
+    location.assign(url.href);
+  }
+
+  static #implicationsStarterText = 'Implies:';
+}