1 files changed, 39 insertions, 0 deletions
diff --git a/tasks/mruby_build_gem.rake b/tasks/mruby_build_gem.rake
new file mode 100644
index 000000000..ae0a79447
--- /dev/null
+++ b/tasks/mruby_build_gem.rake
@@ -0,0 +1,39 @@
+module MRuby
+  module LoadGems
+    def gem(gemdir, &block)
+      gemdir = load_external_gem(gemdir) if gemdir.is_a?(Hash)
+      load File.join(gemdir, "mrbgem.rake")
+      Gem.current.dir = gemdir
+      Gem.current.build = MRuby::Build.current
+      Gem.current.build_config_initializer = block
+      gems << Gem.current
+      Gem.current
+    end
+
+    def load_external_gem(params)
+      if params[:github]
+        params[:git] = "https://github.com/#{params[:github]}.git"
+      end
+
+      if params[:git]
+        url = params[:git]
+        gemdir = "build/mrbgems/#{url.match(/([-_\w]+)(\.[-_\w]+|)$/).to_a[1]}"
+        return gemdir if File.exists?(gemdir)
+
+        options = [params[:options]] || []
+        options << "--branch \"#{params[:branch]}\"" if params[:tag]
+
+        FileUtils.mkdir_p "build/mrbgems"
+        git.run_clone gemdir, url, options
+        
+        gemdir
+      else
+        fail "unknown gem option #{params}"
+      end
+    end
+
+    def enable_gems?
+      [email protected]?
+    end
+  end # LoadGems
+end # MRuby