src-inspector.nix

src-inspector.nix

{ lib, stdenv, unzip, toInspect }:

builtins.mapAttrs (
  name: value: let
    res = builtins.tryEval value.src or null;
  in if (builtins.match "" name) != null && res.success && res.value != null then (stdenv.mkDerivation {
    inherit name;
    src = res.value;
    sourceRoot = ".";

    preUnpack = ''
      if [ "''${src: -4:4}" = '.whl' ] ; then
        oldSrc="$src"
        src="$(mktemp -d)/src.zip"
        ln -s "$oldSrc" "$src"
      fi
    '';

    nativeBuildInputs = [ unzip ];

    dontPatch = true;
    dontConfigure = true;
    dontBuild = true;
    dontFixup = true;

    installPhase = ''
      find . \
        -type f \
        -size +0c \
        '(' \
            -name '*.jar' \
          -o \
            -exec sed -e '1b p ; Q1 ; :p ; /^\x7fELF/Q0 ; /^[\xce\xcf]\xfa\xed\xfe/Q0 ; /^MZ/Q0 ; Q1' '{}' ';'
        ')' \
        -print > $out || true
    '';
  }) else null
) toInspect