Build pdf-simple-sign from C++ by default

pdf-simple-sign-master.nix

@@ -1,8 +1,10 @@
 { pkgs ? import <nixpkgs> { }
 , local ? false
 , full ? true
+, go ? false
 }:
-pkgs.buildGoModule rec {
+let
+	common = rec {
 		pname = "pdf-simple-sign";
 		version = "master";
 
@@ -34,9 +36,6 @@ pkgs.buildGoModule rec {
 				ref = "master";
 			};
 
-#	vendorHash = pkgs.lib.fakeHash;
-	vendorHash = "sha256-05h2f22TPRwadHZfueO8lXKS3Js7d8QVSOrEkY7qUZ8=";
-
 		doCheck = true;
 
 		# libreoffice doesn't contain the lowriter script.
@@ -44,16 +43,40 @@ pkgs.buildGoModule rec {
 			sed -i 's/^lowriter/soffice --writer/' test.sh
 		'';
 
-	checkPhase = ''
-		runHook preCheck
-		./test.sh $GOPATH/bin/pdf-simple-sign
-		runHook postCheck
-	'';
-
 		meta = with pkgs.lib; {
 			description = "Simple PDF signer";
 			homepage = "https://git.janouch.name/p/${pname}";
 			platforms = platforms.all;
 			license = licenses.bsd0;
 		};
-}
+	};
+in if go then
+	pkgs.buildGoModule (common // {
+#		vendorHash = pkgs.lib.fakeHash;
+		vendorHash = "sha256-05h2f22TPRwadHZfueO8lXKS3Js7d8QVSOrEkY7qUZ8=";
+
+		checkPhase = ''
+			runHook preCheck
+			./test.sh $GOPATH/bin/pdf-simple-sign
+			runHook postCheck
+		'';
+	})
+else
+	pkgs.stdenv.mkDerivation (common // {
+		nativeBuildInputs = with pkgs; [
+			meson
+			pkg-config
+			ninja
+			asciidoctor
+		];
+
+		buildInputs = with pkgs; [
+			openssl
+		];
+
+		checkPhase = ''
+			runHook preCheck
+			../test.sh ./pdf-simple-sign
+			runHook postCheck
+		'';
+	})