fuck-u-code

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[!TIP] My new project Navis — A project-centric collaboration operating system for humans and AI agents, built around persistent Projects, shared state, and real-world delivery across domains.

In early development — discussions and contributions welcome · Star · Contact me

[!Important] 📢 Remember this command: fuck-u-code - let bad code have nowhere to hide!

A tool designed to expose shitty code quality with sharp but humorous feedback, showing you exactly how terrible your code is.

Features

• Multi-language support: Go, JavaScript, TypeScript, Python, Java, C, C++, Rust, C#, Lua, PHP, Ruby, Swift, Shell (14 languages)
• Overall Score: 0~100, higher = better code quality
• Shit-Gas Index: Per-file score, higher = worse code
• Seven quality checks: Complexity / Size / Comments / Error handling / Naming / Duplication / Structure
• AST parsing: Accurate syntax analysis powered by tree-sitter
• AI code review: Integrates OpenAI-compatible / Anthropic / DeepSeek / Gemini / Ollama
• Multiple output formats: Colored terminal / Markdown / JSON / HTML
• i18n: English / Chinese / Russian
• Flexible config: .fuckucoderc.json and more, project-level and global support

[!Note] Code analysis runs fully offline — your code never leaves your machine. AI review requires an external API or local Ollama.

Installation

npm install -g eff-u-code

Or build from source:

git clone https://github.com/Done-0/fuck-u-code.git
cd fuck-u-code && npm install && npm run build

Usage

Code Analysis

fuck-u-code analyze              # Analyze current directory
fuck-u-code analyze ./src        # Analyze specific directory
fuck-u-code analyze . -v         # Verbose (project overview, language stats, function metrics)
fuck-u-code analyze . -t 20      # Show top 20 worst files
fuck-u-code analyze . -l zh      # Chinese output
fuck-u-code analyze . -f markdown              # Markdown terminal rendering
fuck-u-code analyze . -f markdown -o report.md # Export Markdown
fuck-u-code analyze . -f html -o report.html   # Export HTML
fuck-u-code analyze . -f json -o report.json   # Export JSON
fuck-u-code analyze . -e "**/*.test.ts"        # Exclude test files

AI Code Review

Requires AI provider setup (see AI Configuration).

fuck-u-code ai-review . -m gpt-4o                          # OpenAI-compatible
fuck-u-code ai-review . -p anthropic -m claude-sonnet-4-5-20250929  # Anthropic
fuck-u-code ai-review . -p ollama -m codellama              # Local Ollama
fuck-u-code ai-review . -m gpt-4o -t 3                     # Review top 3 worst
fuck-u-code ai-review . -m gpt-4o -f markdown -o review.md # Export Markdown
fuck-u-code ai-review . -b https://your-api.com/v1 -k sk-xxx -m model # Custom endpoint

Config Management

fuck-u-code config init                    # Generate .fuckucoderc.json
fuck-u-code config show                    # Show current config
fuck-u-code config set i18n.locale zh      # Set default language
fuck-u-code config set ai.provider openai  # Set AI provider
fuck-u-code config set ai.model gpt-4o     # Set AI model
fuck-u-code config set ai.apiKey sk-xxx    # Set API key

Update

Update eff-u-code to the latest version:

fuck-u-code update    # Update to latest version

This will:

• Check current installed version
• Check latest version on npm
• Auto-install the latest version globally

Uninstall

Remove fuck-u-code and clean up all local files:

fuck-u-code uninstall    # Remove global config, MCP entries, and npm package

This will remove:

• Global config file (~/.fuckucoderc.json)
• MCP server entries (Claude Code, Cursor)
• Global npm package (eff-u-code)

Configuration File

Auto-discovered from project directory upward, then falls back to global ~/.fuckucoderc.json.

Supported formats: .fuckucoderc.json / .yaml / .js / fuckucode.config.js / "fuckucode" field in package.json.

Global config path: macOS/Linux ~/.fuckucoderc.json, Windows C:\Users\<username>\.fuckucoderc.json.

Full example (.fuckucoderc.json):

{
  "exclude": ["**/*.test.ts", "docs/**"],
  "include": ["**/*"],
  "concurrency": 8,
  "verbose": false,
  "output": {
    "format": "console",
    "top": 10,
    "maxIssues": 5,
    "showDetails": true
  },
  "metrics": {
    "weights": {
      "complexity": 0.32,
      "duplication": 0.20,
      "size": 0.18,
      "structure": 0.12,
      "error": 0.08,
      "documentation": 0.05,
      "naming": 0.05
    }
  },
  "ai": {
    "enabled": true,
    "provider": "openai",
    "model": "gpt-4o",
    "baseUrl": "https://api.openai.com/v1",
    "apiKey": "sk-your-api-key"
  },
  "i18n": {
    "locale": "en"
  }
}

AI Configuration

Supports 5 providers. Priority: CLI flags > environment variables > config file.

# OpenAI-compatible
export OPENAI_API_KEY="sk-your-key"
export OPENAI_BASE_URL="https://api.openai.com/v1"  # Optional

# Or via config file
fuck-u-code config set ai.provider openai
fuck-u-code config set ai.model gpt-4o
fuck-u-code config set ai.apiKey sk-your-key
fuck-u-code config set ai.baseUrl https://api.openai.com/v1

MCP Server

fuck-u-code provides an MCP (Model Context Protocol) Server, allowing AI tools like Claude Code, Cursor, Windsurf, etc. to directly invoke code quality analysis and AI code review.

Setup

# Global install
npm install -g eff-u-code

# Auto-configure (interactive)
fuck-u-code mcp-install

# Or specify target directly
fuck-u-code mcp-install claude
fuck-u-code mcp-install cursor

Claude Code (~/.claude.json or project .mcp.json):

{
  "mcpServers": {
    "fuck-u-code": {
      "command": "fuck-u-code-mcp"
    }
  }
}

Cursor (.cursor/mcp.json):

{
  "mcpServers": {
    "fuck-u-code": {
      "command": "fuck-u-code-mcp"
    }
  }
}

Without global install (npx):

{
  "mcpServers": {
    "fuck-u-code": {
      "command": "npx",
      "args": ["-y", "eff-u-code-mcp"]
    }
  }
}

Available Tools

• analyze — Analyze code quality and generate a score report
• ai-review — Run AI-powered code review on the worst-scoring files

Agent Skill

This repo ships an agent skill, fuck-u-code-analysis, that teaches AI agents (Claude Code, Cursor, opencode, etc.) to interpret the analysis output and produce a structured review. It's not shipped via npm — pull it into your agent's skills directory with npx degit (no clone, nothing left behind; requires npm install -g eff-u-code):

# macOS / Linux
npx degit Done-0/fuck-u-code/skills/fuck-u-code-analysis ~/.claude/skills/fuck-u-code-analysis
# Windows (PowerShell)
npx degit Done-0/fuck-u-code/skills/fuck-u-code-analysis "$HOME\.claude\skills\fuck-u-code-analysis"

Above is for Claude Code; for opencode swap .claude for .config/opencode. Add --force if the target exists.

File Exclusion

The tool reads .gitignore files (including nested ones) and follows standard gitignore rules. For additional exclusions, use --exclude or the exclude config field.

Feedback

💬 Share your thoughts Discord: https://discord.gg/9ThNkAFGnT

Contributing

PRs welcome — let's improve fuck-u-code together 🚀

License

MIT

Contact

• fenderisfine@gmail.com
• WeChat: l927171598