comma/flake.nix

{
  description = "runs programs without installing them";

  inputs = {
    naersk = {
      url = "github:nix-community/naersk/master";
      inputs.nixpkgs.follows = "nixpkgs";
    };
    nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
    utils.url = "github:numtide/flake-utils";
    flake-compat = {
      url = "github:edolstra/flake-compat";
      flake = false;
    };
  };

  outputs =
    {
      self,
      nixpkgs,
      utils,
      naersk,
      flake-compat,
    }:
    let
      inherit (nixpkgs) lib;
      commaLambda =
        pkgs:
        pkgs.callPackage (
          {
            stdenv,
            callPackage,
            nix,
            fzy,
            nix-index-unwrapped,
            rustPackages,
            installShellFiles,
            buildPackages,
          }:
          let
            naersk-lib = callPackage naersk { };
          in
          naersk-lib.buildPackage {
            pname = "comma";
            src = self;

            nativeBuildInputs = [
              installShellFiles
            ];
            overrideMain = _: {
              postPatch = ''
                substituteInPlace ./src/main.rs \
                  --replace-fail '"nix-locate"' '"${lib.getExe' nix-index-unwrapped "nix-locate"}"' \
                  --replace-fail '"nix"' '"${lib.getExe nix}"' \
                  --replace-fail '"nix-env"' '"${lib.getExe' nix "nix-env"}"' \
                  --replace-fail '"fzy"' '"${lib.getExe fzy}"'
              '';

              postInstall = ''
                ln -s $out/bin/comma $out/bin/,

                mkdir -p $out/share/comma

                cp $src/etc/command-not-found.sh $out/share/comma
                cp $src/etc/command-not-found.nu $out/share/comma
                cp $src/etc/command-not-found.fish $out/share/comma

                patchShebangs $out/share/comma/command-not-found.sh
                substituteInPlace \
                  "$out/share/comma/command-not-found.sh" \
                  "$out/share/comma/command-not-found.nu" \
                  "$out/share/comma/command-not-found.fish" \
                  --replace-fail "comma --ask" "$out/bin/comma --ask"

              ''
              + lib.optionalString (stdenv.hostPlatform.emulatorAvailable buildPackages) ''
                ${stdenv.hostPlatform.emulator buildPackages} "$out/bin/comma" --mangen > comma.1
                installManPage comma.1
              '';
            };
            checkInputs = [ rustPackages.clippy ];
            doCheck = true;
            cargoTestCommands =
              x:
              x
              ++ [
                ''
                  cargo clippy --all --all-features --tests -- \
                                  -D warnings || true''
              ];
          }
        ) { };
    in
    utils.lib.eachDefaultSystem (
      system:
      let
        pkgs = nixpkgs.legacyPackages.${system};
      in
      {
        packages = {
          default = self.packages."${system}".comma;
          comma = commaLambda pkgs;
        };

        apps.default = utils.lib.mkApp {
          drv = self.packages."${system}".default;
        };

        devShells.default =
          with pkgs;
          mkShell {
            nativeBuildInputs = [
              cargo
              cargo-edit
              nix-index
              rustc
              rustfmt
              rustPackages.clippy
              fzy
            ];
            RUST_SRC_PATH = rustPlatform.rustLibSrc;
          };

        formatter = pkgs.nixfmt-tree;
      }
    )
    // {
      overlays.default = (
        final: prev: {
          comma = commaLambda prev;
        }
      );
    };
}