Added option to decorate tag links in forum posts

src/config/tags.ts

@@ -14,6 +14,28 @@ export const categories: string[] = [
   'body-type',
 ];
 
+/**
+ * Mapping of namespaces to their respective categories. These namespaces are automatically assigned to them, so we can
+ * automatically assume categories of tags which start with them. Mapping is extracted from Philomena directly.
+ *
+ * This mapping may differ between boorus.
+ *
+ * @see https://github.com/philomena-dev/philomena/blob/6086757b654da8792ae52adb2a2f501ea6c30d12/lib/philomena/tags/tag.ex#L33-L45
+ */
+export const namespaceCategories: Map<string, string> = new Map([
+  ['artist', 'origin'],
+  ['art pack', 'content-fanmade'],
+  ['colorist', 'origin'],
+  ['comic', 'content-fanmade'],
+  ['editor', 'origin'],
+  ['fanfic', 'content-fanmade'],
+  ['oc', 'oc'],
+  ['photographer', 'origin'],
+  ['series', 'content-fanmade'],
+  ['spoiler', 'spoiler'],
+  ['video', 'content-fanmade'],
+]);
+
 /**
  * List of tags which marked by the site as blacklisted. These tags are blocked from being added by the tag editor and
  * should usually just be removed automatically.

src/content/components/BlockCommunication.ts

@@ -0,0 +1,65 @@
+import { BaseComponent } from "$content/components/base/BaseComponent";
+import TagSettings from "$lib/extension/settings/TagSettings";
+import { getComponent } from "$content/components/base/component-utils";
+import { decodeTagNameFromLink, resolveTagCategoryFromTagName } from "$lib/booru/tag-utils";
+
+export class BlockCommunication extends BaseComponent {
+  #contentSection: HTMLElement | null = null;
+  #tagLinks: HTMLAnchorElement[] = [];
+
+  #tagLinksReplaced: boolean | null = null;
+
+  protected build() {
+    this.#contentSection = this.container.querySelector('.communication__content');
+    this.#tagLinks = this.#findAllTagLinks();
+  }
+
+  protected init() {
+    BlockCommunication.#tagSettings.resolveReplaceLinks().then(this.#onReplaceLinkSettingResolved.bind(this));
+    BlockCommunication.#tagSettings.subscribe(settings => {
+      this.#onReplaceLinkSettingResolved(settings.replaceLinks ?? false);
+    });
+  }
+
+  #onReplaceLinkSettingResolved(haveToReplaceLinks: boolean) {
+    if (!this.#tagLinks.length || this.#tagLinksReplaced === haveToReplaceLinks) {
+      return;
+    }
+
+    for (const linkElement of this.#tagLinks) {
+      linkElement.classList.toggle('tag', haveToReplaceLinks);
+
+      // Sometimes tags are being decorated with the code block inside. It should be fine to replace it right away.
+      if (linkElement.childElementCount === 1 && linkElement.children[0].tagName === 'CODE') {
+        linkElement.textContent = linkElement.children[0].textContent;
+      }
+
+      if (haveToReplaceLinks) {
+        const maybeDecodedTagName = decodeTagNameFromLink(linkElement.pathname) ?? '';
+        linkElement.dataset.tagCategory = resolveTagCategoryFromTagName(maybeDecodedTagName) ?? '';
+      } else {
+        linkElement.dataset.tagCategory = '';
+      }
+    }
+
+    this.#tagLinksReplaced = haveToReplaceLinks;
+  }
+
+  #findAllTagLinks(): HTMLAnchorElement[] {
+    return Array
+      .from(this.#contentSection?.querySelectorAll('a') || [])
+      .filter(link => link.pathname.startsWith('/tags/'))
+  }
+
+  static #tagSettings = new TagSettings();
+
+  static findAndInitializeAll() {
+    for (const container of document.querySelectorAll<HTMLElement>('.block.communication')) {
+      if (getComponent(container)) {
+        continue;
+      }
+
+      new BlockCommunication(container).initialize();
+    }
+  }
+}

src/content/posts.ts

@@ -0,0 +1,3 @@
+import { BlockCommunication } from "$content/components/BlockCommunication";
+
+BlockCommunication.findAndInitializeAll();

src/lib/booru/tag-utils.ts

@@ -1,3 +1,5 @@
+import { namespaceCategories } from "$config/tags";
+
 /**
  * Build the map containing both real tags and their aliases.
  *
@@ -31,3 +33,52 @@ export function buildTagsAndAliasesMap(realAndAliasedTags: string[], realTags: s
 
   return tagsAndAliasesMap;
 }
+
+const tagLinkRegExp = /\/tags\/(?<encodedTagName>[^/?#]+)/;
+
+/**
+ * List of encoded characters from Philomena.
+ *
+ * @see https://github.com/philomena-dev/philomena/blob/6086757b654da8792ae52adb2a2f501ea6c30d12/lib/philomena/slug.ex#L52-L57
+ */
+const slugEncodedCharacters: Map<string, string> = new Map([
+  ['-dash-', '-'],
+  ['-fwslash-', '/'],
+  ['-bwslash-', '\\'],
+  ['-colon-', ':'],
+  ['-dot-', '.'],
+  ['-plus-', '+'],
+]);
+
+/**
+ * Decode the tag name from its link path.
+ *
+ * @param tagLink Full or partial link to the tag.
+ *
+ * @return Tag name or NULL if function is failed to recognize the link as tag-related link.
+ */
+export function decodeTagNameFromLink(tagLink: string): string | null {
+  tagLinkRegExp.lastIndex = 0;
+
+  const result = tagLinkRegExp.exec(tagLink);
+  const encodedTagName = result?.groups?.encodedTagName;
+
+  if (!encodedTagName) {
+    return null;
+  }
+
+  return decodeURIComponent(encodedTagName)
+    .replaceAll(/-[a-z]+-/gi, match => slugEncodedCharacters.get(match) ?? match)
+    .replaceAll('-', ' ');
+}
+
+/**
+ * Try to resolve the category from the tag name.
+ *
+ * @param tagName Name of the tag.
+ */
+export function resolveTagCategoryFromTagName(tagName: string): string | null {
+  const namespace = tagName.split(':')[0];
+
+  return namespaceCategories.get(namespace) ?? null;
+}

src/lib/extension/settings/TagSettings.ts

@@ -2,6 +2,7 @@ import CacheableSettings from "$lib/extension/base/CacheableSettings";
 
 interface TagSettingsFields {
   groupSeparation: boolean;
+  replaceLinks: boolean;
 }
 
 export default class TagSettings extends CacheableSettings<TagSettingsFields> {
@@ -13,7 +14,15 @@ export default class TagSettings extends CacheableSettings<TagSettingsFields> {
     return this._resolveSetting("groupSeparation", true);
   }
 
+  async resolveReplaceLinks() {
+    return this._resolveSetting("replaceLinks", false);
+  }
+
   async setGroupSeparation(value: boolean) {
     return this._writeSetting("groupSeparation", Boolean(value));
   }
+
+  async setReplaceLinks(value: boolean) {
+    return this._writeSetting("replaceLinks", Boolean(value));
+  }
 }

src/routes/preferences/tags/+page.svelte

@@ -5,7 +5,7 @@
   import Menu from "$components/ui/menu/Menu.svelte";
   import MenuItem from "$components/ui/menu/MenuItem.svelte";
   import { stripBlacklistedTagsEnabled } from "$stores/preferences/maintenance";
-  import { shouldSeparateTagGroups } from "$stores/preferences/tag";
+  import { shouldReplaceLinksOnForumPosts, shouldSeparateTagGroups } from "$stores/preferences/tag";
   import { popupTitle } from "$stores/popup";
 
   $popupTitle = 'Tagging Preferences';
@@ -26,4 +26,9 @@
       Enable separation of custom tag groups on the image pages
     </CheckboxField>
   </FormControl>
+  <FormControl>
+    <CheckboxField bind:checked={$shouldReplaceLinksOnForumPosts}>
+      Find and replace links to the tags in the forum posts
+    </CheckboxField>
+  </FormControl>
 </FormContainer>

src/stores/preferences/tag.ts

@@ -4,15 +4,24 @@ import TagSettings from "$lib/extension/settings/TagSettings";
 const tagSettings = new TagSettings();
 
 export const shouldSeparateTagGroups = writable(false);
+export const shouldReplaceLinksOnForumPosts = writable(false);
 
-tagSettings.resolveGroupSeparation()
-  .then(value => shouldSeparateTagGroups.set(value))
+Promise
+  .allSettled([
+    tagSettings.resolveGroupSeparation().then(value => shouldSeparateTagGroups.set(value)),
+    tagSettings.resolveReplaceLinks().then(value => shouldReplaceLinksOnForumPosts.set(value)),
+  ])
   .then(() => {
     shouldSeparateTagGroups.subscribe(value => {
       void tagSettings.setGroupSeparation(value);
     });
 
+    shouldReplaceLinksOnForumPosts.subscribe(value => {
+      void tagSettings.setReplaceLinks(value);
+    });
+
     tagSettings.subscribe(settings => {
       shouldSeparateTagGroups.set(Boolean(settings.groupSeparation));
+      shouldReplaceLinksOnForumPosts.set(Boolean(settings.replaceLinks));
     });
-  })
+  });

src/styles/content/posts.scss

@@ -0,0 +1,9 @@
+@use '$styles/booru-vars';
+
+.block.communication {
+  .tag {
+    &:hover {
+      color: booru-vars.$resolved-tag-color;
+    }
+  }
+}