shell.nix

# This files creates a development environment using the Nix package
# manager.
#
# The environment is isolated (i.e. it does not use any system
# librairies or binaries) and pinned (the version of each packages is
# fixed), which ensures reproducibility (i.e. system updates will not
# break things).
#
# Usage: run `nix-shell` in the same directory than this file.

with import
  (
    # Get the latest Nixpkgs stable release (22.05)
    fetchTarball {
      url = "https://github.com/nixos/nixpkgs/archive/22.05.tar.gz";
      sha256 = "0d643wp3l77hv2pmg2fi7vyxn4rwy0iyr8djcw1h5x72315ck9ik";
    }
  )
{ };

let
  # Import the Nix User Repository (NUR) to get access to packages
  # that are not in nixpkgs.
  nur = import
    (
      fetchTarball {
        url = "https://github.com/nix-community/NUR/archive/d555cf3bf91bb13bca12d011d6e180dec50066c2.tar.gz";
        sha256 = "1iy3g9xgahvndmyk99lz60jfsrrzc89fypvpb1sjkqxzd6z5ri2f";
      }
    )
    { inherit pkgs; };
  mcfost = nur.repos.smaret.mcfost;
  pymcfost = nur.repos.smaret.pymcfost;
  lmfit = nur.repos.smaret.lmfit;

  # Define a Python environment containing several modules. More
  # modules can be added within the brackets, if they are present in
  # Nixpkgs (all the standard ones should).
  python3Env = python3.withPackages (
    ps: with ps; [
      astropy
      emcee
      lmfit
      numpy
      pandas
      pymcfost
      scipy
    ]
  );
in
mkShell rec {
  # Build a shell containing Python 3 and MCFOST.
  buildInputs = [
    python3Env
    mcfost
  ];
}