foxgirl.engineering
tools for building gleam projects with nix
buildGleamApplication: add support for building apps targeting javascript
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CHANGELOG.md
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CHANGELOG.md
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### added
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- `target` argument in `buildGleam` can be used to specify either erlang or javascript targets
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- javascript target support
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- `target` argument in `buildGleam` and `buildGleamApplication` can be used to specify either erlang or javascript targets
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- add `override` function to derivations produced by `buildGleam` and `buildGleamApplication`
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## v1.0.0 - 2025-09-25
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nix/build-gleam-application.nix
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nix/build-gleam-application.nix
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erlang ? inputs.erlang,
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gleam ? inputs.gleam,
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target ? "erlang",
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buildGleamArgs ? { },
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gleamNixOverrides ? _: _: { },
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...
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};
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withApplication = scope.overrideScope (
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_: prev: {
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_: prev:
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(lib.mapAttrs (_: dep: dep.override { inherit target; }) prev)
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// {
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${pname} = buildGleam (
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buildGleamArgs
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// {
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name = pname;
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inherit version src;
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beamDeps = derivationList prev;
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inherit erlang gleam;
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inherit erlang gleam target;
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}
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);
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}
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) args;
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in
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assert lib.assertOneOf "target" target [
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"erlang"
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"javascript"
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];
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stdenv.mkDerivation (
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filteredArgs
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// {
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buildPhase = ''
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runHook preBuild
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gleam-tool entrypoint ${pname}
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gleam-tool entrypoint ${target}
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runHook postBuild
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'';
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installPhase = ''
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runHook preInstall
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mkdir -p $out/{bin,lib/entrypoint/ebin}
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${lib.concatMapStringsSep "\n" (
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package: "ln -s ${package}/lib/erlang/lib/* $out/lib/"
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) compiledPackages}
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${
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if target == "erlang" then
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''
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mkdir -p $out/{bin,lib/entrypoint/ebin}
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${lib.concatMapStringsSep "\n" (
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package: "ln -s ${package}/lib/erlang/lib/* $out/lib/"
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) compiledPackages}
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mv gleam_entrypoint.beam $out/lib/entrypoint/ebin
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mv gleam_entrypoint.beam $out/lib/entrypoint/ebin
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makeWrapper ${erlang}/bin/erl $out/bin/${pname} --add-flags \
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"-pa $out/lib/*/ebin -eval \"gleam_entrypoint:run()\" -noshell -extra"
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makeWrapper ${erlang}/bin/erl $out/bin/${pname} --add-flags \
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"-pa $out/lib/*/ebin -eval \"gleam_entrypoint:run()\" -noshell -extra"
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''
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else
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''
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mkdir -p $out/lib
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${lib.concatMapStringsSep "\n" (package: "ln -s ${package}/* $out/lib/") compiledPackages}
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mv gleam_entrypoint.mjs $out/lib/
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''
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}
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runHook postInstall
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'';