specify rb_sys as gemfile dependencies

Author: fursich

Gemfile

@@ -8,7 +8,6 @@ gemspec
 gem "rake", "~> 13.0"
 
 gem "rake-compiler"
-gem "rb_sys", "~> 0.9.63"
 
 gem "rspec", "~> 3.0"
 

Gemfile.lock

@@ -2,6 +2,7 @@ PATH
   remote: .
   specs:
     markdown_it_ruby (0.1.0)
+      rb_sys (~> 0.9.63)
 
 GEM
   remote: https://rubygems.org/
@@ -67,7 +68,6 @@ DEPENDENCIES
   markdown_it_ruby!
   rake (~> 13.0)
   rake-compiler
-  rb_sys (~> 0.9.63)
   rspec (~> 3.0)
   rubocop (~> 1.21)
   rubocop-rspec

markdown_it_ruby.gemspec

@@ -7,35 +7,33 @@ Gem::Specification.new do |spec|
   spec.version = MarkdownIt::VERSION
   spec.authors = ["Koji Onishi"]
   spec.email = ["fursich0@gmail.com"]
-
   spec.summary = "ruby integration of markdown-it-rust (with custom plugins)"
   spec.description = ""
   spec.homepage = "https://github.com/fursich/markdown_it_ruby"
   spec.license = "MIT"
   spec.required_ruby_version = ">= 3.2.0"
   spec.required_rubygems_version = ">= 3.3.11"
 
-  spec.metadata["allowed_push_host"] = "TODO: Set to your gem server 'https://example.com'"
-
   spec.metadata["homepage_uri"] = spec.homepage
   spec.metadata["source_code_uri"] = "https://github.com/fursich/markdown_it_ruby"
   # spec.metadata["changelog_uri"] = "TODO: Put your gem's CHANGELOG.md URL here."
 
-  # Specify which files should be added to the gem when it is released.
+  # Specify which files 0hould be added to the gem when it is released.
   # The `git ls-files -z` loads the files in the RubyGem that have been added into git.
-  spec.files = Dir.chdir(__dir__) {
-    `git ls-files -z`.split("\x0").reject do |f|
-      (File.expand_path(f) == __FILE__) ||
+  gemspec = File.basename(__FILE__)
+  spec.files = IO.popen(%w[git ls-files -z], chdir: __dir__, err: IO::NULL) { |ls|
+    ls.readlines("\x0", chomp: true).reject { |f|
+      (f == gemspec) ||
         f.start_with?(*%w[bin/ test/ spec/ features/ .git .github appveyor Gemfile])
-    end
+    }
   }
   spec.bindir = "exe"
   spec.executables = spec.files.grep(%r{\Aexe/}) { |f| File.basename(f) }
   spec.require_paths = ["lib"]
   spec.extensions = ["ext/markdown_it_ruby/Cargo.toml"]
 
   # Uncomment to register a new dependency of your gem
-  # spec.add_dependency "example-gem", "~> 1.0"
+  spec.add_dependency "rb_sys", "~> 0.9.63"
 
   # For more information and examples about making a new gem, check out our
   # guide at: https://bundler.io/guides/creating_gem.html