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Scylla/elm.nix

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{ lib, stdenv, elm, fetchElmDeps, uglify-js, sass }:
let
mkDerivation =
{ srcs ? ./elm-dependencies.nix
, src
, name
, srcdir ? "./src"
, targets ? []
, registryDat ? ./registry.dat
, outputJavaScript ? false
}:
stdenv.mkDerivation {
inherit name src;
buildInputs = [ elm sass ]
++ lib.optional outputJavaScript uglify-js;
buildPhase = fetchElmDeps {
elmPackages = import srcs;
elmVersion = "0.19.1";
inherit registryDat;
};
installPhase = let
elmfile = module: "${srcdir}/${builtins.replaceStrings ["."] ["/"] module}.elm";
extension = if outputJavaScript then "js" else "html";
in ''
${lib.concatStrings (map (module: ''
echo "compiling ${elmfile module}"
elm make ${elmfile module} --optimize --output $out/${module}.${extension}
${lib.optionalString outputJavaScript ''
echo "minifying ${elmfile module}"
uglifyjs $out/${module}.${extension} --compress 'pure_funcs="F2,F3,F4,F5,F6,F7,F8,F9,A2,A3,A4,A5,A6,A7,A8,A9",pure_getters,keep_fargs=false,unsafe_comps,unsafe' \
| uglifyjs --mangle --output $out/${module}.min.${extension}
''}
'') targets)}
# Custom logic for Scylla in particular
mkdir $out/static $out/static/js $out/static/css $out/static/svg
cp $src/index.html $out/index.html
cp $out/Main.min.js $out/static/js/elm.js
cp $src/static/js/*.js $out/static/js
cp $src/static/svg/*.svg $out/static/svg
sass $src/static/scss/style.scss $out/static/css/style.css
'';
};
in mkDerivation {
name = "Scylla-0.1.0";
srcs = ./elm-dependencies.nix;
src = ./.;
targets = ["Main"];
srcdir = "./src";
outputJavaScript = true;
}