codeforcesparser.nvim

A feature-rich Codeforces plugin for Neovim. Solve competitive programming problems without leaving your favorite editor.

Features

• Cloudflare Bypass: Uses Playwright to reliably fetch problems despite Cloudflare bot protection.
• Language Choice: Prompted to choose between C++ and Python on every fetch.
• Auto-Test Runner: Run sample test cases with a single command and see detailed pass/fail results.
• Side-by-Side View: Opens the problem statement and solution file in a dedicated tab.
• Smart Detection: Runner automatically detects the language from your file extension.

Requirements

• Neovim 0.8+
• Node.js & npm (required for Playwright)
• plenary.nvim

Installation

Using lazy.nvim

If you use LazyVim, put this in your lua/plugins/example.lua file:

return {
  {
    "didenamine/codeforcesparser.nvim",
    dependencies = { "nvim-lua/plenary.nvim" },
    cmd = { "CF" },

    -- The repo is named codeforcesparser.nvim, but the Lua module is "codeforces".
    main = "codeforces",
    opts = {
      language = "cpp",
      timeout = 5000,
    },

    -- Runs from the plugin directory.
    build = "npm install && npx playwright install chromium",
  },
}

Setup

After lazy.nvim installs the plugin, make sure Playwright's Chromium browser is available.

The easiest (path-independent) way is:

:Lazy build codeforcesparser.nvim

If you prefer to run it manually, run these commands from the plugin root:

npm install
npx playwright install chromium

To find the actual checkout path on any system/config:

:lua print(require("lazy.core.config").options.root)

Then use <printed_root>/codeforcesparser.nvim.

Usage

• :CF fetch <url>: Fetch a problem. You will be prompted to choose C++ or Python.
• :CF runtests: Run all sample test cases for the current problem.
• :CF open: Re-open the last fetched problem in a new tab.
• :CF list: List all locally saved problems.

Keymaps

Inside a solution buffer, you can use:

• <leader>ct: Run all tests (shortcut for :CF runtests).
• <leader>co: Focus the problem statement pane.