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Support buildHaskell

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Use Nix and Briefcase to easily create Haskell executables.

I'd eventually like to support something like: briefcase.buildHaskell.project
that let me define a few top-level values (e.g. ghcExtensions) and would give me
a ghci environment with the proper `.ghci` settings so that my development
environment mirrored my build environment... baby steps, though.
This commit is contained in:
William Carroll 2020-08-12 16:26:17 +01:00
parent 869a20f482
commit 4ea55dd013
2 changed files with 41 additions and 9 deletions
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31
buildHaskell/default.nix Normal file
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@ -0,0 +1,31 @@
{ pkgs, ... }:
{
# Create a nix-shell for Haskell development.
shell = { deps }: let
ghc = pkgs.haskellPackages.ghcWithPackages (hpkgs: deps hpkgs);
in pkgs.mkShell {
buildInputs = [ghc];
};
# Build a Haskell executable. This assumes a project directory with a
# top-level Main.hs. It also applies a few commonly used language extensions.
# Here is an overview of the arguments:
# - `name`: You can find the result at ./result/$name
# - `srcs`: Will be passed to `srcs` field of `pkgs.stdenv.mkDerivation`.
# - `deps`: A function that accepts `hpkgs` and returns a list of Haskell
# dependencies.
program = { name, srcs, deps, ghcExtensions }: let
ghc = pkgs.haskellPackages.ghcWithPackages (hpkgs: deps hpkgs);
in pkgs.stdenv.mkDerivation {
name = name;
buildInputs = [];
srcs = srcs;
buildPhase = ''
${ghc}/bin/ghc -Wall Main.hs ${pkgs.lib.concatMapStrings (x: "-X${x} ") ghcExtensions}
'';
installPhase = ''
mkdir -p $out && mv Main $out/${name}
'';
};
}

19
default.nix
View file

@ -23,13 +23,14 @@ let
depot = depot;
};
in {
nixos = readTree ./nixos;
utils = readTree ./utils;
emacs = readTree ./emacs;
website = readTree ./website;
lisp = readTree ./lisp;
gopkgs = readTree ./gopkgs;
monzo_ynab = readTree ./monzo_ynab;
third_party = readTree ./third_party;
tools = readTree ./tools;
nixos = readTree ./nixos;
utils = readTree ./utils;
emacs = readTree ./emacs;
website = readTree ./website;
lisp = readTree ./lisp;
gopkgs = readTree ./gopkgs;
monzo_ynab = readTree ./monzo_ynab;
third_party = readTree ./third_party;
tools = readTree ./tools;
buildHaskell = readTree ./buildHaskell;
}