From 564f9286da57c227c4d22bc667bae6009e40b613 Mon Sep 17 00:00:00 2001
From: Barrett Ruth <62671086+barrettruth@users.noreply.github.com>
Date: Sat, 7 Mar 2026 15:38:12 -0500
Subject: [PATCH] fix(scraper): httpx login fast paths, proactive validation,
 and slug filename fix (#358)

## Problem

httpx scrapers (CSES, Kattis, USACO) always ran full login flows even
with valid cached sessions. \`credentials.lua\` always prompted before
trying cached credentials. \`default_filename\` doubled the slug for
Kattis single-problem mode (e.g. \`addtwonumbersaddtwonumbers.cc\`).

## Solution

Added token/cookie fast paths to CSES \`login()\` and USACO
\`login()\`/\`submit()\`.
Hardened Kattis reactive re-auth trigger to check status code first.
Refactored \`credentials.lua\` to try cached credentials before
prompting.
Fixed \`default_filename\` to not concatenate when \`contest_id ==
problem_id\`.
---
 lua/cp/config.lua | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/lua/cp/config.lua b/lua/cp/config.lua
index 74a40b7..2291101 100644
--- a/lua/cp/config.lua
+++ b/lua/cp/config.lua
@@ -605,10 +605,10 @@ end
 ---@param problem_id? string
 ---@return string
 local function default_filename(contest_id, problem_id)
-  if problem_id then
+  if problem_id and problem_id ~= contest_id then
     return (contest_id .. problem_id):lower()
   end
-  return contest_id:lower()
+  return (problem_id or contest_id):lower()
 end
 M.default_filename = default_filename