/char-find command to get a specific unique char

- findChar utility function that does the heavy lifting of finding a specific char based on conditions
- Log/warn if multiple characters match
- Validation function for named args that should be arrays

public/scripts/slash-commands/SlashCommandCommonEnumsProvider.js

@@ -2,7 +2,7 @@ import { chat_metadata, characters, substituteParams, chat, extension_prompt_rol
 import { extension_settings } from '../extensions.js';
 import { getGroupMembers, groups } from '../group-chats.js';
 import { power_user } from '../power-user.js';
-import { searchCharByName, getTagsList, tags } from '../tags.js';
+import { searchCharByName, getTagsList, tags, tag_map } from '../tags.js';
 import { world_names } from '../world-info.js';
 import { SlashCommandClosure } from './SlashCommandClosure.js';
 import { SlashCommandEnumValue, enumTypes } from './SlashCommandEnumValue.js';
@@ -181,6 +181,18 @@ export const commonEnumProviders = {
      */
     personas: () => Object.values(power_user.personas).map(persona => new SlashCommandEnumValue(persona, null, enumTypes.name, enumIcons.persona)),
 
+    /**
+     * All possible tags, or only those that have been assigned
+     *
+     * @param {('all' | 'assigned')} [mode='all'] - Which types of tags to show
+     * @returns {() => SlashCommandEnumValue[]}
+     */
+    tags: (mode = 'all') => () => {
+        let assignedTags = mode === 'assigned' ? new Set(Object.values(tag_map).flat()) : new Set();
+        return tags.filter(tag => mode === 'all' || (mode === 'assigned' && assignedTags.has(tag.id)))
+            .map(tag => new SlashCommandEnumValue(tag.name, null, enumTypes.command, enumIcons.tag));
+    },
+
     /**
      * All possible tags for a given char/group entity
      *