From 1ac11cc1c1858af1cef725d68cacf7102366e588 Mon Sep 17 00:00:00 2001
From: Alyssa Ross <hi@alyssa.is>
Date: Mon, 6 Jan 2020 23:06:59 +0000
Subject: [PATCH] defaultGemConfig: remove asciidoctor-diagram JARs

(Except on JRuby, where these are presumably important.)
---
 pkgs/development/ruby-modules/gem-config/default.nix | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/pkgs/development/ruby-modules/gem-config/default.nix b/pkgs/development/ruby-modules/gem-config/default.nix
index 4d7ddf549c32..088bcedf6de3 100644
--- a/pkgs/development/ruby-modules/gem-config/default.nix
+++ b/pkgs/development/ruby-modules/gem-config/default.nix
@@ -39,6 +39,15 @@ let
 in
 
 {
+  asciidoctor-diagram = { version, ruby, ... }: {
+    postInstall = ''
+      # Delete vendored JAR files unless using JRuby.
+      if ruby -e 'exit(RUBY_PLATFORM != "java")'; then
+          rm -v $out/${ruby.gemPath}/gems/$gemName-${version}/lib/*.jar
+      fi
+    '';
+  };
+
   atk = attrs: {
     dependencies = attrs.dependencies ++ [ "gobject-introspection" ];
     nativeBuildInputs = [ rake bundler pkgconfig ];