Generate a gitignore

Author: Zachary Scott

bintest/mruby-cli.rb

@@ -12,7 +12,7 @@
       assert_true status.success?, "Process did not exit cleanly"
       assert_true Dir.exist?(app_name)
       Dir.chdir(app_name) do
-        (%w(mrbgem.rake build_config.rb Rakefile Dockerfile docker-compose.yml) + ["tools/#{app_name}/#{app_name}.c", "mrblib/#{app_name}.rb", "bintest/#{app_name}.rb"]).each do |file|
+        (%w(.gitignore mrbgem.rake build_config.rb Rakefile Dockerfile docker-compose.yml) + ["tools/#{app_name}/#{app_name}.c", "mrblib/#{app_name}.rb", "bintest/#{app_name}.rb"]).each do |file|
           assert_true(File.exist?(file), "Could not find #{file}")
           assert_include output, " create  #{file}"
         end
@@ -30,7 +30,7 @@
       Dir.chdir(app_name) do
         output, status = Open3.capture2("rake compile")
         assert_true status.success?, "Process did not exit cleanly"
-        
+
         output, status = Open3.capture2("mruby/bin/#{app_name}")
         assert_true status.success?, "Process did not exit cleanly"
         assert_include output, "Hello World"

mrblib/setup.rb

@@ -8,6 +8,7 @@ def initialize(name, output)
     def run
       Dir.mkdir(@name) unless Dir.exist?(@name)
       Dir.chdir(@name) do
+        write_file(".gitignore", gitignore)
         write_file("mrbgem.rake", mrbgem_rake)
         write_file("build_config.rb", build_config_rb)
         write_file("Rakefile", rakefile)
@@ -104,6 +105,12 @@ def mrbgem_rake
 MRBGEM_RAKE
     end
 
+    def gitignore
+      <<IGNORE
+mruby/
+IGNORE
+    end
+
     def build_config_rb
       <<BUILD_CONFIG_RB
 def gem_config(conf)