Add useGroupLookup hook

app/soapbox/entity-store/hooks/index.ts

@@ -1,6 +1,7 @@
 export { useEntities } from './useEntities';
 export { useEntity } from './useEntity';
 export { useEntityActions } from './useEntityActions';
+export { useEntityLookup } from './useEntityLookup';
 export { useCreateEntity } from './useCreateEntity';
 export { useDeleteEntity } from './useDeleteEntity';
 export { useDismissEntity } from './useDismissEntity';

app/soapbox/entity-store/hooks/useEntityLookup.ts

@@ -63,4 +63,4 @@ function findEntity<TEntity extends Entity>(
   }
 }
 
-export default useEntityLookup;
+export { useEntityLookup };

app/soapbox/hooks/api/groups/useGroupLookup.ts

@@ -0,0 +1,17 @@
+import { Entities } from 'soapbox/entity-store/entities';
+import { useEntityLookup } from 'soapbox/entity-store/hooks';
+import { useApi } from 'soapbox/hooks/useApi';
+import { groupSchema } from 'soapbox/schemas';
+
+function useGroupLookup(slug: string) {
+  const api = useApi();
+
+  return useEntityLookup(
+    Entities.GROUPS,
+    (group) => group.slug === slug,
+    () => api.get(`/api/v1/groups/lookup?name=${slug}`),
+    { schema: groupSchema },
+  );
+}
+
+export { useGroupLookup };

app/soapbox/schemas/group.ts

@@ -28,6 +28,7 @@ const groupSchema = z.object({
   members_count: z.number().catch(0),
   note: z.string().transform(note => note === '<p></p>' ? '' : note).catch(''),
   relationship: groupRelationshipSchema.nullable().catch(null), // Dummy field to be overwritten later
+  slug: z.string().catch(''), // TruthSocial
   statuses_visibility: z.string().catch('public'),
   tags: z.array(groupTagSchema).catch([]),
   uri: z.string().catch(''),