feat(gpodder): add user filter for paginated users method

gpodder_sqlite/src/repository/auth.rs

@@ -143,16 +143,31 @@ impl gpodder::GpodderAuthStore for SqliteRepository {
         .map_err(AuthErr::from)
     }
 
-    fn paginated_users(&self, page: gpodder::Page) -> Result<Vec<gpodder::User>, AuthErr> {
-        Ok(users::table
-            .select(User::as_select())
-            .order(users::username.asc())
-            .offset((page.page * page.per_page) as i64)
-            .limit(page.per_page as i64)
-            .get_results(&mut self.pool.get().map_err(DbError::from)?)
-            .map_err(DbError::from)?
-            .into_iter()
-            .map(gpodder::User::from)
-            .collect())
+    fn paginated_users(
+        &self,
+        page: gpodder::Page,
+        filter: &gpodder::UserFilter,
+    ) -> Result<Vec<gpodder::User>, AuthErr> {
+        (|| {
+            let mut query = users::table
+                .select(User::as_select())
+                .order(users::username.asc())
+                .offset((page.page * page.per_page) as i64)
+                .limit(page.per_page as i64)
+                .into_boxed();
+
+            if let Some(username) = &filter.username {
+                // Case insensitive by default for SQLite
+                query = query.filter(users::username.like(format!("%{username}%")));
+            }
+
+            Ok::<_, DbError>(
+                query
+                    .load_iter(&mut self.pool.get()?)?
+                    .map(|res| res.map(gpodder::User::from))
+                    .collect::<Result<Vec<_>, _>>()?,
+            )
+        })()
+        .map_err(AuthErr::from)
     }
 }