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vic/checkmate

A flake checker (treefmt & nix-unit) for testing other flakes with zero dependencies.
Source code at GitHub https://github.com/vic/checkmate
vic/checkmate.json
{
  "defaultBranch": "main",
  "description": "A flake checker (treefmt & nix-unit) for testing other flakes with zero dependencies.",
  "fullName": "vic/checkmate",
  "homepage": "",
  "language": "Nix",
  "name": "checkmate",
  "pushedAt": "2025-11-21T22:49:35Z",
  "stargazersCount": 7,
  "updatedAt": "2025-11-21T22:49:39Z",
  "url": "https://github.com/vic/checkmate"
}

Sponsor Vic Dendritic Nix License CI Status

Checkmate - A Dendritic flake checker (treefmt & nix-unit) for testing other flakes with zero dependencies.

Section titled “Checkmate - A Dendritic flake checker (treefmt & nix-unit) for testing other flakes with zero dependencies.”

checkmate and vic’s dendritic libs made for you with Love++ and AI—. If you like my work, consider sponsoring

Checks included by default

Section titled “Checks included by default”

  • treefmt - nixfmt, deadnix, mdformat, yamlfmt. See treefmt.nix.

  • nix-unit - The flake being checked is available as inputs.target

Extensible.

Section titled “Extensible.”

Checkmate is a collection of Dendritic modules.

Getting started

Section titled “Getting started”
Terminal window
# Generate a new project including github CI action
nix flake new -t github:vic/checkmate

Running flake check locally

Section titled “Running flake check locally”
Terminal window
nix flake check github:vic/checkmate --override-input target .

Running treefmt on your code

Section titled “Running treefmt on your code”
Terminal window
# formatting your code
nix run github:vic/checkmate#fmt --override-input target .


# checking if code is formatted
nix run github:vic/checkmate#fmt --override-input target . -- --ci

CI Usage

Section titled “CI Usage”

On your github action:

on:
  pull_request:
  push:
jobs:
  checkmate:
    name: checkmate
    runs-on: ubuntu-latest
    steps:
      - uses: cachix/install-nix-action@v30
      - run: nix flake check -L github:vic/checkmate --override-input target github:$GITHUB_REPOSITORY/$GITHUB_SHA

Examples

Section titled “Examples”

Some repos being tested with checkmate: