asciinema/flake.nix

{
  description = "Terminal session recorder";

  inputs = {
    nixpkgs.url = github:NixOS/nixpkgs/nixos-unstable;
    rust-overlay.url = github:oxalica/rust-overlay;
    flake-parts.url = github:hercules-ci/flake-parts;
  };

  outputs = inputs @ {
    flake-parts,
    rust-overlay,
    ...
  }:
    flake-parts.lib.mkFlake {inherit inputs;} {
      systems = ["x86_64-linux" "aarch64-linux" "aarch64-darwin" "x86_64-darwin"];
      perSystem = {
        config,
        self',
        inputs',
        pkgs,
        system,
        ...
      }: let
        packageToml = (builtins.fromTOML (builtins.readFile ./Cargo.toml)).package;
        msrv = packageToml.rust-version;

        buildDeps = rust:
          with pkgs;
            [
              rust
            ]
            ++ (lib.optionals stdenv.isDarwin [
              libiconv
              darwin.apple_sdk.frameworks.Foundation
            ])
            ++ testDeps;

        testDeps = with pkgs; [
          python3
        ];

        mkDevShell = rust:
          pkgs.mkShell {
            packages = buildDeps (rust.override {
              extensions = ["rust-src"];
            });

            env.RUST_BACKTRACE = 1;
          };

        mkPackage = rust:
          (pkgs.makeRustPlatform {
            cargo = rust;
            rustc = rust;
          })
          .buildRustPackage {
            pname = packageToml.name;
            inherit (packageToml) version;
            src = builtins.path {
              path = ./.;
              inherit (packageToml) name;
            };
            cargoLock.lockFile = ./Cargo.lock;
            buildInputs = buildDeps rust;
            dontUseCargoParallelTests = true;
          };
      in {
        _module.args = {
          pkgs = import inputs.nixpkgs {
            inherit system;
            overlays = [(import rust-overlay)];
          };
        };

        formatter = pkgs.alejandra;

        devShells = {
          default = mkDevShell pkgs.rust-bin.stable.latest.default;
          msrv = mkDevShell pkgs.rust-bin.stable.${msrv}.default;
        };
        packages.default = mkPackage pkgs.rust-bin.stable.latest.minimal;
      };
    };
}