[rubygems/rubygems] Move config_file_name logic to its own method

https://github.com/rubygems/rubygems/commit/ac4596aace

lib/rubygems/config_file.rb

@@ -168,23 +168,7 @@ class Gem::ConfigFile
   # TODO: parse options upstream, pass in options directly
 
   def initialize(args)
-    @config_file_name = nil
-    need_config_file_name = false
-
-    arg_list = []
-
-    args.each do |arg|
-      if need_config_file_name
-        @config_file_name = arg
-        need_config_file_name = false
-      elsif arg =~ /^--config-file=(.*)/
-        @config_file_name = $1
-      elsif arg =~ /^--config-file$/
-        need_config_file_name = true
-      else
-        arg_list << arg
-      end
-    end
+    set_config_file_name(args)
 
     @backtrace = DEFAULT_BACKTRACE
     @bulk_threshold = DEFAULT_BULK_THRESHOLD
@@ -197,13 +181,14 @@ class Gem::ConfigFile
     platform_config = Marshal.load Marshal.dump(PLATFORM_DEFAULTS)
     system_config = load_file SYSTEM_WIDE_CONFIG_FILE
     user_config = load_file config_file_name.dup.untaint
+
     environment_config = (ENV['GEMRC'] || '')
       .split(File::PATH_SEPARATOR).inject({}) do |result, file|
         result.merge load_file file
       end
 
     @hash = operating_system_config.merge platform_config
-    unless arg_list.index '--norc'
+    unless args.index '--norc'
       @hash = @hash.merge system_config
       @hash = @hash.merge user_config
       @hash = @hash.merge environment_config
@@ -227,7 +212,7 @@ class Gem::ConfigFile
     @api_keys         = nil
     @rubygems_api_key = nil
 
-    handle_arguments arg_list
+    handle_arguments args
   end
 
   ##
@@ -486,4 +471,21 @@ if you believe they were disclosed to a third party.
   attr_reader :hash
   protected :hash
 
+  private
+  def set_config_file_name(args)
+    @config_file_name = nil
+    need_config_file_name = false
+
+    args.each do |arg|
+      if need_config_file_name
+        @config_file_name = arg
+        need_config_file_name = false
+      elsif arg =~ /^--config-file=(.*)/
+        @config_file_name = $1
+      elsif arg =~ /^--config-file$/
+        need_config_file_name = true
+      end
+    end
+  end
+
 end