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Barrett Ruth b7ddf4c253
fix(scrapers): cookie fast paths, centralized storage, and reauth hardening (#363) 
## Problem

Scraper cookie handling was fragmented across per-platform files with no
shared access, httpx scrapers lacked `checking_login` fast paths on
login, and several re-auth edge cases (CodeChef submit, CF cookie guard,
AtCoder cookie persistence) caused unnecessary full re-logins or silent
failures.

## Solution

Centralize all cookie storage into a single `cookies.json` via helpers
in `base.py`. Add `checking_login` fast paths to `kattis.py` (using the
`x-username` response header as a session probe), `usaco.py`, and
`cses.py` login flows. Fix `kattis.py` submit to emit `checking_login`
only after loading cookies. Remove AtCoder cookie persistence from login
entirely — always do a fresh session. Harden CodeChef and CF reauth
with consistent status logging and cookie guard checks.
2026-03-07 16:10:51 -05:00
.github ci: nix config migration 2026-02-23 18:04:17 -05:00
after/ftplugin rename and simplify things 2025-10-05 11:59:24 -04:00
doc fix: expand language IDs, fix AtCoder submit, normalize logging (#353) 2026-03-06 21:35:13 -05:00
lua/cp fix(scrapers): cookie fast paths, centralized storage, and reauth hardening (#363) 2026-03-07 16:10:51 -05:00
plugin refactor(race): replace :CP race with --race flag (#347) 2026-03-06 18:33:42 -05:00
scrapers fix(scrapers): cookie fast paths, centralized storage, and reauth hardening (#363) 2026-03-07 16:10:51 -05:00
scripts feat(atcoder): extract submit helpers; add live status notifications (#294) 2026-03-04 19:27:29 -05:00
tests feat(codechef): implement full CodeChef support (#354) 2026-03-06 23:10:44 -05:00
.editorconfig fix: imports 2025-09-18 20:12:01 -04:00
.gitignore fix(scrapers): cookie fast paths, centralized storage, and reauth hardening (#363) 2026-03-07 16:10:51 -05:00
.luarc.json feat(atcoder): extract submit helpers; add live status notifications (#294) 2026-03-04 19:27:29 -05:00
.pre-commit-config.yaml format yml too in pre-commit 2026-02-03 01:43:13 -05:00
.prettierignore some misc fixes 2025-12-07 16:09:17 -06:00
.prettierrc fix: scrapers 2025-10-05 22:10:26 -04:00
.python-version initial commit 2025-09-11 23:52:32 -05:00
.styluaignore feat(atcoder): extract submit helpers; add live status notifications (#294) 2026-03-04 19:27:29 -05:00
AI_DEBUG.md fix(scrapers): cookie fast paths, centralized storage, and reauth hardening (#363) 2026-03-07 16:10:51 -05:00
cp.nvim-scm-1.rockspec fix(ci): fix rockspec url 2026-02-01 17:01:29 -05:00
flake.lock try to fix the setup 2026-02-18 14:13:37 -05:00
flake.nix fix: replace curl_cffi with scrapling in codeforces metadata (#334) 2026-03-06 13:25:44 -05:00
LICENSE fix(ci): format 2025-09-18 20:04:36 -04:00
pyproject.toml fix: replace curl_cffi with scrapling in codeforces metadata (#334) 2026-03-06 13:25:44 -05:00
README.md ci: format 2026-03-06 23:42:45 -05:00
selene.toml ci: nix config migration 2026-02-23 18:04:17 -05:00
stylua.toml fix: imports 2025-09-18 20:12:01 -04:00
uv.lock fix: remove curl_cffi 2026-03-06 15:05:42 -05:00
vim.yaml fix(config): add bit to ignored filetypes 2026-02-26 19:09:16 -05:00

README.md

cp.nvim

The definitive competitive programming environment for Neovim

Scrape problems, run tests, and debug solutions across multiple platforms with zero configuration.

https://github.com/user-attachments/assets/e81d8dfb-578f-4a79-9989-210164fc0148

Features

  • Multi-platform support: AtCoder, CodeChef, Codeforces, USACO, CSES, Kattis
  • Automatic problem setup: Scrape test cases and metadata in seconds
  • Dual view modes: Lightweight I/O view for quick feedback, full panel for detailed analysis
  • Test case management: Quickly view, edit, add, & remove test cases
  • Rich test output: 256 color ANSI support for compiler errors and program output
  • Language agnostic: Works with any language
  • Diff viewer: Compare expected vs actual output with 3 diff modes

Installation

Install using your package manager of choice or via luarocks:

luarocks install cp.nvim

Dependencies

Quick Start

cp.nvim follows a simple principle: solve locally, submit remotely.

Basic Usage

  1. Find a contest or problem

  2. Set up contests locally

    :CP codeforces 1848

  3. Code and test

    :CP run

  4. Navigate between problems

    :CP next
:CP prev
:CP e1

  5. Debug and edit test cases

:CP edit
:CP panel --debug
  1. Submit on the original website

Documentation

:help cp.nvim

See my config for the setup in the video shown above.

Motivation

I could not find a neovim-centric, efficient, dependency-free, flexible, and easily customizable competitive programming workflow that "just works"--so I made it myself. I conferenced with top competitive programmers at Carnegie Mellon Univerity and the University of Virginia and covered their (and my) pain points:

  • Scraping: contests are automatically loaded asynchronously
  • Test Case Management: test case editor (:CP edit)
  • UI: both run and panel layouts cover common formats
  • Extensibility: snippet plugins, compilation, etc. are left to the programmer

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