let

# steps to update package set:

# - fetch the actual commit: git ls-remote https://github.com/nixos/nixpkgs-channels nixos-19.09

# - get the sha256: nix-prefetch-url --unpack https://github.com/NixOS/nixpkgs/archive/<COMMIT>.tar.gz

pkgs = import (builtins.fetchTarball {

name = "nixos-19.09-57b7b0";

url = https://github.com/NixOS/nixpkgs/archive/57b7b019812fbe2cb760dd38d521f1cc16b14877.tar.gz;

sha256 = "0xsgwyp4dfsfynag2prkagw0mdg7zx7gyljf8yvsc047ppnd85a8";

}) {};

# 2019-12-04T18:20:17+09:00

easy-ps = import (pkgs.fetchFromGitHub {

owner = "justinwoo";

repo = "easy-purescript-nix";

rev = "6cb5825430ab44719139f28b93d50c5810891366";

sha256 = "1awsywpw92xr4jmkwfj2s89wih74iw4ppaifc97n9li4pyds56h4";

}) { inherit pkgs; };

buildInputs =

(with pkgs; [ dhall nodejs chromium ]) ++

(with pkgs.nodePackages; [ parcel-bundler bower pulp ]) ++

(with easy-ps; [ purs spago spago2nix ]);

in pkgs.mkShell {

inherit buildInputs;

shellHooks =

let make-example-screenshot = name: window-size:

pkgs.writeScript "make-${name}-example-screenshot.sh" ''

spago build

parcel build --public-url ./ example/${name}-example.html

chromium --headless --window-size=${window-size} \

--screenshot=example/${name}-example.png dist/${name}-example.html

'';

in ''

alias make-usage-example-screenshot="${make-example-screenshot "usage" "300x70"}"

alias make-full-example-screenshot="${make-example-screenshot "full" "400x400"}"

alias make-all-screenshots="make-usage-example-screenshot; make-full-example-screenshot"

'';

}