build/rust/flake.nix


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{
  description = "%INIT_DESCRIPTION";

  inputs = {
    nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";

    treefmt-nix = {
      url = "github:numtide/treefmt-nix";
      inputs = {
        nixpkgs.follows = "nixpkgs";
      };
    };

    crane = {
      url = "github:ipetkov/crane";
      inputs = {};
    };
    rust-overlay = {
      url = "github:oxalica/rust-overlay";
      inputs = {
        nixpkgs.follows = "nixpkgs";
      };
    };

    # inputs for following
    systems = {
      url = "github:nix-systems/x86_64-linux"; # only evaluate for this system
    };
    flake-compat = {
      url = "github:edolstra/flake-compat";
      flake = false;
    };
    flake-utils = {
      url = "github:numtide/flake-utils";
      inputs = {
        systems.follows = "systems";
      };
    };
  };

  outputs = {
    self,
    nixpkgs,
    flake-utils,
    treefmt-nix,
    crane,
    rust-overlay,
    ...
  }:
    flake-utils.lib.eachDefaultSystem (system: let
      pkgs = import nixpkgs {
        inherit system;
        overlays = [(import rust-overlay)];
      };

      nightly = false;
      rust_minimal =
        if nightly
        then pkgs.rust-bin.selectLatestNightlyWith (toolchain: toolchain.minimal)
        else pkgs.rust-bin.stable.latest.minimal;
      rust_default =
        if nightly
        then pkgs.rust-bin.selectLatestNightlyWith (toolchain: toolchain.default)
        else pkgs.rust-bin.stable.latest.default;

      cargo_toml = craneLib.cleanCargoToml {cargoToml = ./Cargo.toml;};
      pname = cargo_toml.package.name;

      craneLib = (crane.mkLib pkgs).overrideToolchain rust_minimal;
      craneBuild = craneLib.buildPackage {
        src = craneLib.cleanCargoSource ./.;

        doCheck = true;
      };

      manual = pkgs.stdenv.mkDerivation {
        name = "${pname}-manual";
        inherit (cargo_toml.package) version;

        src = ./docs;
        nativeBuildInputs = with pkgs; [pandoc];

        buildPhase = ''
          mkdir --parents $out/docs;

          pandoc "./${pname}.1.md" -s -t man > $out/docs/${pname}.1
        '';

        installPhase = ''
          install -D $out/docs/${pname}.1  $out/share/man/man1/${pname};
        '';
      };

      treefmtEval = import ./treefmt.nix {inherit treefmt-nix pkgs;};
    in {
      packages.default = pkgs.symlinkJoin {
        inherit (cargo_toml.package) name;

        paths = [manual craneBuild];
      };

      checks = {
        inherit craneBuild;
        formatting = treefmtEval.config.build.check self;
      };

      formatter = treefmtEval.config.build.wrapper;

      devShells.default = pkgs.mkShell {
        packages = with pkgs; [
          cocogitto

          rust_default
          cargo-edit

          reuse
        ];
      };
    });
}
# vim: ts=2