是否有任何源代碼分析工具在Ruby中檢測到未使用的參數？

如何在Ruby中檢測未使用的參數？是否有任何源代碼分析工具在Ruby中檢測到未使用的參數？

選擇我所知道的包括

作爲嚴謹與TDD。
Heckle（由於ParseTree問題，目前僅適用於Ruby 1.8）
使用IDE（如RubyMine）檢測未使用的參數或自動執行重構。

但是，是否有任何源代碼分析工具或警告選項允許您檢測未使用的參數？

背景：我在做一些重構。我從（代碼稍有簡化）改爲：

# Not within the Foo class (therefore can't be as easily accessed by unit testing) 
# and in addition, the name of the configuration file is hard-wired 
def parse_configuration 
    raw_configuration = YAML.load_file("configuration.yml") 
    # Do stuff with raw_configuration to produce configuration_options_for_foo 
    return configuration_options_for_foo 
end 

if __FILE__ == $0 
    configuration_options_for_foo = parse_configuration 
    foo = Foo.new(configuration_options_for_foo) 
end

到

class Foo 
    # Now unit tests can call Foo.new_using_yaml("configuration.yml") 
    # or use "test_configuration.yml" 
    def self.new_using_yaml(yaml_filename) 
    # Where I went wrong, forgetting to replace "configuration.yml" with yaml_filename 
    raw_configuration = YAML.load_file("configuration.yml") 
    # Do stuff with raw_configuration to produce configuration_options_for_foo 
    new(configuration_options_for_foo) 
    end 
end 

if __FILE__ == $0 
    foo = Foo.new_using_yaml("configuration.yml") 
end

來源

2011-05-18 Andrew Grimm