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Developing with Nix

Get Nix

First you will need to install Nix from https://nixos.org/download. It's as simple as running a command in your terminal.

Usage

Note

First build will trigger multiple downloads.

Software immediately available in the build environment:

  • Compiler (clang or gcc)
  • clang-format
  • clang-tidy
  • clangd
  • cmake
  • ccache
  • ninja

The default compiler is gcc.

Create a build environment:

$ nix develop .

Or just build and run the tests:

$ nix build .

Changing the compiler

Currently two compilers are supported: gcc 13 and clang 18.

To select a specific compiler use this notation (works for both build and develop):

$ nix develop .#gcc
$ nix develop .#clang

VSCode

Note

The executable code is assumed to be available in your $PATH. on Mac it's in /Applications/Visual Studio Code.app/Contents/Resources/app/bin

Once you are in a build environment it's possible to use VSCode directly by running it from that environment:

$ git clone git@github.com:libfn/functional.git
$ cd functional && nix develop .
bash-5.2$ code .

This makes the selected compiler available as a kit in VSCode as well as allows the project to be automatically configured by cmake once the kit is selected.