j4m3s-s/clj2nix

Convert deps.edn to a nix expression

clj2nix

try without installing

$ nix run github:hlolli/clj2nix -- deps.edn deps.nix

installation

(Change rev and sha256 according to nix-prefetch-github hlolli clj2nix)

let
  clj2nix = pkgs.callPackage (pkgs.fetchFromGitHub {
    owner = "hlolli";
    repo = "clj2nix";
    rev = "b9a28d4a920d5d680439b1b0d18a1b2c56d52b04";
    sha256 = "0d8xlja62igwg757lab9ablz1nji8cp9p9x3j0ihqvp1y48w2as3";
  }) {};

usage

After the installation you should have clj2nix on your path, which takes two arguments, the depn.edn file for the project's dependencies, and the output file.

Example:

$ clj2nix ./deps.edn ./deps.nix [options]

With an imported deps.nix you can use it to fetch the dependencies trough nix. The generated file currently requires that fetchMavenArtifact, fetchgit, lib are explicitly passed (see example below). The imported attribute-set has two helper functions that can do classpath handling for you. These are: makeClasspaths {} and makePaths {}.

{ stdenv, pkgs, clojure }:

let cljdeps = import ./deps.nix { inherit (pkgs) fetchMavenArtifact fetchgit lib; };
    classp  = cljsdeps.makeClasspaths {};

in stdenv.mkDerivation {
  ...whatever here...

  installPhase = ''
      clojure -i somefile.clj -Scp ${classp}
  '';
}

makeClasspaths (colon seperated classpaths)

# example
let cljdeps = import ./deps.nix { inherit (pkgs) fetchMavenArtifact fetchgit lib; };
    classp  = cljsdeps.makeClasspaths {};

....
echo ${classp}

prints:
/nix/store/9zp8rpnhpmx9i1g7vnicq6hiz11yknqi-clj-time_clj-time-0.14.2.jar:/nix/store/n7fmadn560r77qw34814a97j408n0vd6-data.csv:/nix/store/sch7dhx6f6mhfx33nvl964qfdr8ivn2x-joda-time_joda-time-2.9.7.jar

with the optional parameter extraClasspaths

# example
let cljdeps = import ./deps.nix { inherit (pkgs) fetchMavenArtifact fetchgit lib; };
    classp  = cljsdeps.makeClasspaths { extraClasspaths = ["./local/file.jar"]; };

....
echo ${classp}

prints:
/nix/store/9zp8rpnhpmx9i1g7vnicq6hiz11yknqi-clj-time_clj-time-0.14.2.jar:/nix/store/n7fmadn560r77qw34814a97j408n0vd6-data.csv:/nix/store/sch7dhx6f6mhfx33nvl964qfdr8ivn2x-joda-time_joda-time-2.9.7.jar:./local/file.jar

makePaths

# example
let cljdeps = import ./deps.nix { inherit (pkgs) fetchMavenArtifact fetchgit lib; };
    classp  = cljsdeps.makePaths {};

#! bash
# echo ${builtins.concatStringsSep " " classp}
# prints (square brackets added for demonstrations):
[
  "/nix/store/9zp8rpnhpmx9i1g7vnicq6hiz11yknqi-clj-time_clj-time-0.14.2.jar"
  "/nix/store/n7fmadn560r77qw34814a97j408n0vd6-data.csv"
  "/nix/store/sch7dhx6f6mhfx33nvl964qfdr8ivn2x-joda-time_joda-time-2.9.7.jar"
]

options

It's possible to add the extra dependencies form aliases into the nix file by adding one or more -Aalias to the end of the command. Example

clj2nix ./deps.edn ./deps.nix -A:test -A:ci