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mehen

v1.7.0

Published

Tool to compute and export code metrics

Vulnerabilities

Powered byPowered by Snyk
  • 0High
  • 0Medium
  • 0Low

Links

Git

Maintainers

tinovyatkintinovyatkin

Keywords

metricscode-analysiscomplexitycyclomatichalsteadrustgotypescriptcli

Readme

mehen

Rust-powered CLI for heuristic source code and documentation metrics: complexity, maintainability, lines of code, and Markdown documentation health.

📚 Documentation: https://mehen.ophi.dev

Install

npm install -g mehen

Or run without installing:

npx -y mehen --help
bunx mehen --help

Also available on PyPI:

uvx mehen --help

Commands

# Analyze exactly one file
mehen metrics <path>

# Compare metrics between two git revisions (powers the GitHub Action)
mehen diff --from <base> --to <head> --paths <path>...

# Rank the worst-offending files in one or more trees
mehen top-offenders <path>... --metric <metric>

Full quickstart: https://mehen.ophi.dev/quickstart.

What mehen computes

For source code: cyclomatic complexity, cognitive complexity, Halstead suite, Maintainability Index, ABC, LOC family (SLOC, PLOC, LLOC, CLOC, blank), NARGS, NEXITS, NOM, NPA, NPM, WMC.

For Markdown documentation: Documentation Maintainability Index (DMI), Markdown Reading Path Complexity (MRPC), Markdown Cognitive Complexity (MCC), Markdown Halstead, Link Debt, Table Burden, Visual Scaffold, Artifact Debt, Repository Grounding, Evidence Coverage, Filler / Lazy Structure Risk, Review Criticality Index, plus an opt-in English / Japanese prose layer.

Full metric catalog with formulas and references: https://mehen.ophi.dev/metrics/code/overview.

Supported languages

Python (Ruff), TypeScript / JavaScript / JSX / TSX (Oxc), PHP (Mago), Ruby (Prism), Rust (ra_ap_syntax), Kotlin (ANTLR — official Kotlin spec grammar), Go (tree-sitter), C (tree-sitter), PowerShell (tree-sitter), and Markdown (pulldown-cmark).

CI integration

mehen ships a GitHub Action that computes changed-file metric trends on pull requests, compares against the base branch, and posts a summary comment:

permissions:
  contents: read
  pull-requests: write
  issues: write

steps:
  - uses: actions/checkout@v6
    with:
      fetch-depth: 0
  - uses: ophi-dev/mehen@v1
    with:
      paths: src
      thresholds: |
        cyclomatic=5
        cognitive=4

Full reference: https://mehen.ophi.dev/guides/github-action.

Platforms

Native binaries are provided for:

| OS | x64 | arm64 | |---|---|---| | Linux (glibc) | @mehen/linux-x64-gnu | @mehen/linux-arm64-gnu | | Linux (musl) | @mehen/linux-x64-musl | @mehen/linux-arm64-musl | | macOS | @mehen/darwin-x64 | @mehen/darwin-arm64 | | Windows | @mehen/win32-x64 | @mehen/win32-arm64 |

The correct binary is selected automatically at runtime.

Requires Node.js >= 18.

Links

License

AGPL-3.0-only