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nixpkgs: main:
with nixpkgs;
with nixpkgs.lib;
let
# provided by .envrc
root = builtins.getEnv "BIZ_ROOT";
# general functions to put in a lib
lines = s: strings.splitString "\n" s;
seq = ls: builtins.filter (x: x!= null) ls;
# turn the file path into a Haskell module name
relpath = builtins.replaceStrings ["${root}/"] [""] (builtins.toString main);
module = builtins.replaceStrings ["/" ".hs"] ["." ""] relpath;
# extract info from special comments
content = builtins.readFile main;
exe = builtins.head (lists.flatten (seq
(map (builtins.match "^-- : exe ([[:alnum:]._-]*)$")
(lines content))));
deps = lists.flatten (seq
(map (builtins.match "^-- : dep ([[:alnum:]._-]*)$")
(lines content)));
# do the build...
depsToPackageSet = packageSet: deps:
map (s: builtins.getAttr s packageSet) deps;
claySrc = pkgs.fetchFromGitHub {
owner = "sebastiaanvisser";
repo = "clay";
rev = "cc7729b1b42a79e261091ff7835f7fc2a7ae3cee";
sha256 = "1vd67976lvi5l4qq18zy6j44apynkl44ps04p8vwfx4gzr895dyp";
};
ghc865_ = pkgs.haskell.packages.ghc865.override (oldAttrs: {
overrides = with pkgs.haskell.lib; self: super: {
clay = self.callCabal2nix "clay" claySrc {};
wai-middleware-metrics = dontCheck super.wai-middleware-metrics;
};
});
ghc = ghc865_.ghcWithPackages (hp: depsToPackageSet hp deps);
in stdenv.mkDerivation {
name = module;
version = "0";
src = ../../.; # this is the git root
nativeBuildInputs = [ ghc ];
strictDeps = true;
buildPhase = ''
#
mkdir -p $out/{bin,static} ${baseNameOf relpath}
#
# compile with ghc
#
${ghc}/bin/ghc -Werror -i. \
--make ${main} \
-main-is ${module} \
-o $out/bin/${exe}
'';
# the install process was handled above
installPhase = "exit 0";
} // { env = ghc; }
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