- -> _

Because hyphen are not common in Go's filename delimiters

Author: sue445

_tools/ruby_h_to_go/lib/ruby_h_to_go/generator_helper.rb

@@ -7,7 +7,7 @@ module GeneratorHelper
     # @param ruby_header_file [String]
     # @return [String]
     def go_file_name(header_dir:, ruby_header_file:)
-      ruby_header_file.delete_prefix(header_dir + File::SEPARATOR).gsub(File::SEPARATOR, "-").gsub(/\.h$/, ".go")
+      ruby_header_file.delete_prefix(header_dir + File::SEPARATOR).gsub(File::SEPARATOR, "_").gsub(/\.h$/, ".go")
     end
 
     # @param str [String]

_tools/ruby_h_to_go/spec/ruby_h_to_go/generator_helper_spec.rb

@@ -9,6 +9,6 @@
     let(:header_dir) { "/path/to/include" }
     let(:ruby_header_file) { "/path/to/include/ruby/internal/intern/thread.h" }
 
-    it { should eq "ruby-internal-intern-thread.go" }
+    it { should eq "ruby_internal_intern_thread.go" }
   end
 end