mizchi/similarity

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# similarity-ts/rs/py High-performance code similarity detection tools written in Rust. Detects duplicate functions and similar code patterns across your codebase in multiple programming languages. ## Tool Maturity Status | Tool | Language | Status | Description | | ---------------------- | ------------------------- | ----------------------- | --------------------------------- | | **similarity-ts** | TypeScript/JavaScript | ✅ **Production Ready** | Most mature and production-tested | | **similarity-py** | Python | ⚠️ **Beta** | Not production-tested yet | | **similarity-rs** | Rust | ⚠️ **Beta** | Not production-tested yet | | **similarity-elixir** | Elixir | 🧪 **Experimental** | Early development stage | | **similarity-generic** | Go, Java, C/C++, C#, Ruby | 🧪 **Experimental** | Early development stage | | **similarity-md** | Markdown | 🧪 **Experimental** | Early development stage | | **similarity-css** | CSS/SCSS | 🧪 **Experimental** | Prototype implementation | ## Features - **Zero configuration** - works out of the box - **Multi-language support** - TypeScript/JavaScript, Python, and Rust - **Fast & Accurate** - AST-based comparison, not just text matching - **AI-friendly output** - Easy to share with Claude, GPT-4, etc. ## Quick Start ### 1. Install (TypeScript/JavaScript) ```bash cargo install similarity-ts ``` ### 2. Detect duplicates ```bash # Scan current directory similarity-ts . # Scan specific files similarity-ts src/utils.ts src/helpers.ts # Show actual code similarity-ts . --print ``` ### 3. Refactor with AI Copy the output and use this prompt with Claude: ``` Run `similarity-ts .` to detect semantic code similarities. Execute this command, analyze the duplicate code patterns, and create a refactoring plan. Check `similarity-ts -h` for detailed options. ``` Example output: ``` Duplicates in src/utils.ts: ──────────────────────────────────────────────────────────── src/utils.ts:10-20 calculateTotal <-> src/helpers.ts:5-15 computeSum Similarity: 92.50%, Score: 9.2 points ``` The AI will analyze patterns and suggest refactoring strategies. ## Documentation - [AI Assistant Guide](.claude/commands/check-similarity.md) - Refactoring workflow and best practices ## Available Tools ### Production Ready - **similarity-ts** - TypeScript/JavaScript similarity detection ✅ **Most mature and production-tested** ### Beta (Not production-tested yet) - **similarity-py** - Python similarity detection ⚠️ _Not production-tested_ - **similarity-rs** - Rust similarity detection ⚠️ _Not production-tested_ ### Experimental - **similarity-elixir** - Elixir similarity detection 🧪 _Experimental_ - **similarity-generic** - Generic similarity detection for Go, Java, C/C++, C#, Ruby 🧪 _Experimental_ - **similarity-md** - Markdown similarity detection 🧪 _Experimental_ - **similarity-css** - CSS/SCSS similarity detection 🧪 _Experimental_ - Detects duplicate styles and BEM variations ## Installation ### Prebuilt binaries (GitHub Releases) Push a `v*` tag to publish prebuilt archives to GitHub Releases. ```bash git tag v0.5.0 git push origin v0.5.0 ``` Each release uploads one archive per target: - `similarity-<tag>-x86_64-unknown-linux-gnu.tar.gz` - `similarity-<tag>-aarch64-apple-darwin.tar.gz` Each archive contains all CLI binaries (`similarity-ts`, `similarity-py`, `similarity-rs`, `similarity-elixir`, `similarity-generic`, `similarity-md`, `similarity-css`, `similarity-php`) plus `README.md` and `LICENSE`. ### TypeScript/JavaScript ```bash # Install from crates.io cargo install similarity-ts # Use the installed binary similarity-ts --help ``` ### Python ```bash # Install from crates.io cargo install similarity-py # Use the installed binary similarity-py --help ``` ### Rust ```bash # Install from crates.io cargo install similarity-rs # Use the installed binary similarity-rs --help ``` ### Elixir ```bash # Install from crates.io cargo install similarity-elixir # Use the installed binary similarity-elixir --help ``` ### Other Languages (Go, Java, C/C++, C#, Ruby) ```bash # Install from crates.io cargo install similarity-generic # Use the installed binary similarity-generic --language go main.go similarity-generic --language java Main.java ``` ### From source ```bash # Clone the repository git clone https://github.com/mizchi/similarity.git cd similarity # Build all tools cargo build --release # Or install specific tool cargo install --path crates/similarity-ts cargo install --path crates/similarity-py cargo install --path crates/similarity-rs ``` ## Usage ### Common Options (All Languages) - `--threshold` / `-t` - Similarity threshold (0.0-1.0, default: 0.85) - `--min-lines` / `-m` - Minimum lines for functions (default: 3-5) - `--min-tokens` - Minimum AST nodes for functions - `--print` / `-p` - Print code in output - `--cross-file` / `-c` - Enable cross-file comparison - `--no-size-penalty` - Disable size difference penalty ### TypeScript/JavaScript Specific ```bash # Check for duplicate functions (default) similarity-ts ./src # Enable type checking (default enabled) similarity-ts ./src --no-types # disable type checking # Check types only similarity-ts ./src --no-functions # Check classes for similarity similarity-ts ./src --classes # Check classes only similarity-ts ./src --classes-only # Fast mode with bloom filter (default) similarity-ts ./src --no-fast # disable ``` ### Python Specific ```bash # Check Python files similarity-py ./src # Include test files similarity-py . --extensions py,test.py ``` ### Rust Specific ```bash # Check Rust files similarity-rs ./src # Skip test functions (test_ prefix or #[test]) similarity-rs . --skip-test # Set minimum tokens (default: 30) similarity-rs . --min-tokens 50 ``` ## Output Format The tool outputs in a VSCode-compatible format for easy navigation: ``` Duplicates in src/utils.ts: ──────────────────────────────────────────────────────────── src/utils.ts:10 | L10-15 similar-function: calculateSum src/utils.ts:20 | L20-25 similar-function: addNumbers Similarity: 85.00%, Priority: 8.5 (lines: 10) ``` Click on the file paths in VSCode's terminal to jump directly to the code. Results are sorted by priority (lines × similarity) to help you focus on the most impactful duplications first. ## AI Integration ### Prompt for Code Deduplication For AI assistants (like Claude, GPT-4, etc.) to help with code deduplication: ``` `similarity-ts .` でコードの意味的な類似が得られます。あなたはこれを実行し、ソースコードの重複を検知して、リファクタリング計画を立てます。細かいオプションは similarity-ts -h で確認してください。 ``` English version: ``` Run `similarity-ts .` to detect semantic code similarities. Execute this command, analyze the duplicate code patterns, and create a refactoring plan. Check `similarity-ts -h` for detailed options. ``` ### Example Workflow with AI 1. **Run similarity detection**: ```bash similarity-ts . --threshold 0.8 --min-lines 10 ``` 2. **Share output with AI**: Copy the similarity report to your AI assistant 3. **AI analyzes patterns**: The AI will identify common patterns and suggest refactoring strategies 4. **Iterative refinement**: Adjust threshold and options based on AI recommendations ### Integration with Development Tools This tool can be integrated into: - Pre-commit hooks to prevent duplicate code - CI/CD pipelines for code quality checks - IDE extensions for real-time duplicate detection - AI-powered code review workflows ## How It Works ### Core Algorithm 1. **AST Parsing**: Language-specific parsers convert code to ASTs - TypeScript/JavaScript: oxc-parser (fast) - Python/Rust: tree-sitter 2. **Tree Extraction**: Extracts function/method nodes with structure 3. **TSED Algorithm**: Tree Structure Edit Distance with size penalties 4. **Similarity Score**: Normalized score between 0 and 1 5. **Impact Calculation**: Considers code size for prioritization ### Overlap Detection (Experimental) The `--experimental-overlap` flag enables detection of partial code overlaps within and across functions: ```bash # Basic overlap detection similarity-ts ./src --experimental-overlap # With custom parameters similarity-ts ./src --experimental-overlap \ --threshold 0.75 \ --overlap-min-window 8 \ --overlap-max-window 25 \ --overlap-size-tolerance 0.25 ``` **Parameters:** - `--experimental-overlap`: Enable overlap detection mode - `--overlap-min-window`: Minimum AST nodes to consider (default: 8) - `--overlap-max-window`: Maximum AST nodes to consider (default: 25) - `--overlap-size-tolerance`: Size variation tolerance (default: 0.25) **Use Cases:** - Finding copy-pasted code fragments within larger functions - Detecting similar algorithmic patterns across different contexts - Identifying refactoring opportunities for common code blocks ### Language-Specific Features - **TypeScript**: Type similarity detection (interfaces, type aliases) - **Python**: Class and method detection, decorator support - **Rust**: Test function filtering, impl block analysis ## Examples ### TypeScript/JavaScript ```bash # Find duplicate functions similarity-ts ./src --threshold 0.7 --print # Find similar types across files similarity-ts ./src --no-functions --experimental-types --cross-file --print # Comprehensive analysis similarity-ts ./src \ --threshold 0.8 \ --min-lines 10 \ --cross-file \ --extensions ts,tsx # Detect partial code overlaps (Experimental) similarity-ts ./src --experimental-overlap --threshold 0.75 --print ``` ### Python ```bash # Find duplicate functions in Python project similarity-py ./src --threshold 0.85 --print # Check with custom settings similarity-py . \ --min-lines 5 \ --extensions py ``` ### Rust ```bash # Find duplicates excluding tests similarity-rs ./src --skip-test --print # Strict checking with high token count similarity-rs . \ --min-tokens 50 \ --threshold 0.9 \ --skip-test ``` ## Experimental: Generic Language Support > ⚠️ **EXPERIMENTAL**: The generic language support is in early development and may have limitations or bugs. ### similarity-generic The `similarity-generic` tool provides experimental support for additional languages using tree-sitter parsers: - Go - Java - C - C++ - C# - Ruby - Elixir #### Installation ```bash # From crates.io (when available) cargo install similarity-generic # From source cargo install --path crates/similarity-generic ``` #### Usage ```bash # Detect Go duplicates similarity-generic --language go ./src # Detect Java duplicates similarity-generic --language java ./src # Detect C/C++ duplicates similarity-generic --language c ./src similarity-generic --language cpp ./src # Detect C# duplicates similarity-generic --language csharp ./src # Detect Ruby duplicates similarity-generic --language ruby ./src # Detect Elixir duplicates similarity-generic --language elixir ./src # Common options work the same way similarity-generic --language go ./src --threshold 0.8 --print ``` #### Supported Languages | Language | File Extensions | Status | | -------- | ------------------------- | ------------ | | Go | .go | Experimental | | Java | .java | Experimental | | C | .c, .h | Experimental | | C++ | .cpp, .cc, .cxx, .hpp, .h | Experimental | | C# | .cs | Experimental | | Ruby | .rb | Experimental | #### Custom Language Configuration You can also provide custom language configurations: ```bash # Use custom config file similarity-generic --config ./my-language.json ./src ``` See [examples/configs/custom-language-template.json](crates/similarity-generic/examples/configs/custom-language-template.json) for configuration format. #### Limitations - Performance is slower than specialized tools (similarity-ts, similarity-py, similarity-rs) - Detection accuracy may vary by language - Some language-specific features may not be fully supported - Custom configurations require understanding of tree-sitter node types For production use, prefer the specialized tools when available. ## Performance - Written in Rust for maximum performance - Concurrent file processing - Memory-efficient algorithms - Language-specific optimizations: - **TypeScript/JavaScript**: Fast mode with bloom filters (~4x faster) - **Python/Rust**: Tree-sitter based parsing - Intelligent filtering reduces unnecessary comparisons ## License MIT

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软件开发工程师软件质量保证分析师与测试员

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check-similarity-mbt

软件质量保证分析师与测试员

Detect duplicate MoonBit code using AST-based similarity analysis. Use when working with .mbt files and looking for code duplication, refactoring opportunities, or enforcing code quality.

原文语言：英语

2026-04-16

check-similarity-py

软件开发工程师

Detect duplicate Python code using AST-based similarity analysis. Use when working with .py files and looking for code duplication or refactoring opportunities.

原文语言：英语

2026-04-16

check-similarity-rs

软件开发工程师

Detect duplicate Rust code using AST-based similarity analysis. Use when working with .rs files and looking for code duplication or refactoring opportunities.

原文语言：英语

2026-04-16

check-similarity

软件开发工程师

Detect duplicate code using AST-based similarity analysis. Auto-selects the right tool based on file types in the project (similarity-ts for TypeScript/JavaScript, similarity-py for Python, similarity-mbt for MoonBit, similarity-rs for Rust, etc).

原文语言：英语

2026-04-16

check-similarity-ts

软件开发工程师

Detect duplicate TypeScript/JavaScript code using AST-based similarity analysis. Use when working with .ts/.tsx/.js/.jsx files and looking for code duplication or refactoring opportunities.

原文语言：英语

2026-04-16

已展示 5 / 5 个已收集 Skill。