dub2nix

CLI tool to create Nix expressions for D-lang Dub projects.

Installation

Install with nix-env:

nix-env -if https://github.com/lionello/dub2nix/archive/master.tar.gz

or add to your shell.nix and run nix-shell:

with import <nixpkgs> {};
let
  dub2nix-src = fetchTarball {
    url = "https://github.com/lionello/dub2nix/archive/master.tar.gz";
  };
  dub2nix = (import dub2nix-src) { inherit pkgs; };
in mkShell {
  buildInputs = [
    dub2nix # dub dmd dtools ldc etc..
  ];
}

Development

Do git clone and nix-shell to build with dub:

nix-shell
dub

Alternatively, use direnv:

echo use nix >> .envrc
direnv allow
dub

Test

To run the tests, do:

nix-instantiate --eval "test"

This should evaluate to true.

Usage

Usage: dub2nix [OPTIONS] COMMAND

Create Nix derivations for Dub package dependencies.

Commands:
  save         Write Nix files for Dub project

Options:
-i     --input Path of selections JSON; defaults to ./dub.selections.json
-o    --output Output Nix file for Dub project
-r  --registry URL to Dub package registry; default http://code.dlang.org/packages/
-d --deps-file Output Nix file with dependencies; defaults to ./dub.selections.nix
-h      --help This help information.

First, use dub build to generate the dub.selections.json for your Dub project. Then, run dub2nix save to read the dub.selections.json in the current folder and write a new file dub.selections.nix.

This dub.selections.nix is used in mkDubDerivation (from mkDub.nix) to create a new derivation for your Dub project:

{pkgs}:
with (import ./mkDub.nix {
    inherit pkgs;
});
mkDubDerivation {
    version = "0.1.0"; # optional
    src = ./.;
}

When your project has no dependencies at all, this will fail because dub.selections.nix is missing. Set deps to override the dependencies:

{pkgs}:
with (import ./mkDub.nix {
    inherit pkgs;
});
mkDubDerivation {
    src = ./.;
    deps = [];
}

Use the --output option to write a .nix file with a skeleton derivation for your dub project. This will also create the mkDub.nix file for importing into the derivation.