Initial commit

.editorconfig

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+root = true
+
+[*.*]
+end_of_line = lf
+charset = utf-8
+indent_style = space
+indent_size = 2
+trim_trailing_whitespace = true

.envrc

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+use flake -Lv

.github/workflows/nix-build.yml

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+name: "Nix build"
+on:
+  pull_request:
+  push:
+jobs:
+  checks:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v3
+    - uses: cachix/install-nix-action@v20
+    - uses: cachix/cachix-action@v12
+      with:
+        name: mrcjkb
+        authToken: '${{ secrets.CACHIX_AUTH_TOKEN }}'
+    - run: nix flake check --print-build-logs
+
+  shell:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v3
+    - uses: cachix/install-nix-action@v20
+    - uses: cachix/cachix-action@v12
+      with:
+        name: mrcjkb
+        authToken: '${{ secrets.CACHIX_AUTH_TOKEN }}'
+    - run: nix build .#devShells.x86_64-linux.default --print-build-logs

.gitignore

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+result
+.pre-commit-config.yaml
+.direnv

CHANGELOG.md

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+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [Unreleased]
+
+## [3.0.0] - 2023-01-02
+
+### Added
+
+- Some pre-commit-hooks/lints.
+
+## [2.0.0] - 2023-01-02
+
+### Changed
+
+- Replace `nixpkgs-fmt` with `alejandra`.
+
+## [1.0.0] - 2022-10-20
+
+### Added
+
+- Initial release.

CONTRIBUTING.md

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+# Contributing guide
+
+Contributions are more than welcome!
+
+Please don't forget to add your changes to the "Unreleased" section
+of [the changelog](./CHANGELOG.md) (if applicable).
+
+## Commit messages
+
+This project uses [Conventional Commits](https://www.conventionalcommits.org/en/v1.0.0/).
+
+## Development
+
+I use [`nix`](https://nixos.org/download.html#download-nix) for development and testing.
+
+To enter a development shell:
+
+```console
+nix-shell
+```
+
+or (with flakes enabled)
+
+```console
+nix develop
+```
+
+To apply formatting, while in a devShell, run
+
+```console
+pre-commit run --all
+```
+
+If you use [`direnv`](https://direnv.net/),
+just run `direnv allow` and you will be dropped in this devShell.
+
+## Tests
+
+To run tests locally
+
+```console
+nix-build -A ci
+```
+
+or (with flakes enabled)
+
+```console
+nix build .#checks.<your-system>.ci --print-build-logs
+```
+
+For formatting:
+
+```console
+nix-build -A formatting
+```
+
+or (with flakes enabled)
+
+```console
+nix build .#checks.<your-system>.formatting --print-build-logs
+```
+
+If you have flakes enabled and just want to run all checks that are available,
+run:
+
+```console
+nix flake check --print-build-logs
+```