nixpkgs/pkgs/build-support/make-darwin-bundle/write-darwin-bundle.nix

{ writeScriptBin, lib, makeBinaryWrapper }:

let
  pListText = lib.generators.toPlist { } {
    CFBundleDevelopmentRegion = "English";
    CFBundleExecutable = "$name";
    CFBundleIconFile = "$icon";
    CFBundleIconFiles = [ "$icon" ];
    CFBundleIdentifier = "org.nixos.$name";
    CFBundleInfoDictionaryVersion = "6.0";
    CFBundleName = "$name";
    CFBundlePackageType = "APPL";
    CFBundleSignature = "???";
  };
in writeScriptBin "write-darwin-bundle" ''
    shopt -s nullglob

    readonly prefix=$1
    readonly name=$2
    # TODO: support executables with spaces in their names
    readonly execName=''${3%% *} # Before the first space
    [[ $3 =~ " " ]] && readonly execArgs=''${3#* } # Everything after the first space
    readonly icon=$4.icns
    readonly squircle=''${5:-1}
    readonly plist=$prefix/Applications/$name.app/Contents/Info.plist
    readonly binary=$prefix/bin/$execName
    readonly bundleExecutable=$prefix/Applications/$name.app/Contents/MacOS/$name

    cat > "$plist" <<EOF
${pListText}
EOF

    if [[ $squircle == 0 || $squircle == "false" ]]; then
      sed  '/CFBundleIconFiles/,\|</array>|d' -i "$plist"
    fi

    if [[ -n "$execArgs" ]]; then
      (
        source ${makeBinaryWrapper}/nix-support/setup-hook
        # WORKAROUND: makeBinaryWrapper fails when -u is set
        set +u
        makeBinaryWrapper "$binary" "$bundleExecutable" --add-flags "$execArgs"
      )
    else
      ln -s "$binary" "$bundleExecutable"
    fi
''