我一直试图找出ruby-gem的依赖关系。我知道gem依赖命令会让我知道gem的依赖关系。但我想做的不止于此。我还想知道gem dependency命令生成的那些gem的依赖关系。我的意思是，我想找出所有的宝石，直到最后一颗宝石，我的宝石依赖于宝石。
任何指针都将受到赞赏。提前谢谢。
注意：我们的想法是建立像https://www.gemlou.pe/
这样的东西答案 0 :(得分：10)
下面的类将递归地获取gem依赖项（注意它的概念证明，因此它没有做任何花哨的事情，但它是一个很好的起点）。有关文档，请参阅rubydocs：Gem::Dependency和Gem::Specification
class GemRequirements
def initialize(name, version = nil)
@gem = Gem::Dependency.new(name, version)
end
def dependency_tree
@dependency_tree ||= {}.merge(get_dependency(@gem))
end
private
def get_dependency(gem_dependency)
spec = gem_dependency.matching_specs.first
dep_key = "#{gem_dependency.name} #{spec.version}"
hash = { dep_key => {} }
spec.runtime_dependencies.each do |spec_dependency|
spec_dependency_spec = spec_dependency.matching_specs.first
spec_dep_key = "#{spec_dependency.name} #{spec_dependency_spec.version}"
hash[dep_key][spec_dep_key] = get_dependency(spec_dependency)
end
hash
end
end
您可以在您的应用程序或ruby控制台中以编程方式使用它：
r = GemRequirements.new 'rails'
r.dependency_tree
=> {"rails 3.2.12"=>
{"activesupport 3.2.12"=>
{"activesupport 3.2.12"=>
{"i18n 0.6.4"=>{"i18n 0.6.4"=>{}},
"multi_json 1.8.2"=>{"multi_json 1.8.2"=>{}}}},
"actionpack 3.2.12"=>
{"actionpack 3.2.12"=>
{"activesupport 3.2.12"=>
{"activesupport 3.2.12"=>
{"i18n 0.6.4"=>{"i18n 0.6.4"=>{}},
"multi_json 1.8.2"=>{"multi_json 1.8.2"=>{}}}},
"activemodel 3.2.12"=>
{"activemodel 3.2.12"=>
{"activesupport 3.2.12"=>
{"activesupport 3.2.12"=>
{"i18n 0.6.4"=>{"i18n 0.6.4"=>{}},
"multi_json 1.8.2"=>{"multi_json 1.8.2"=>{}}}},
"builder 3.0.4"=>{"builder 3.0.4"=>{}}}},
"rack-cache 1.2"=>
{"rack-cache 1.2"=>{"rack 1.4.5"=>{"rack 1.4.5"=>{}}}},
"builder 3.0.4"=>{"builder 3.0.4"=>{}},
"rack 1.4.5"=>{"rack 1.4.5"=>{}},
"rack-test 0.6.2"=>
{"rack-test 0.6.2"=>{"rack 1.4.5"=>{"rack 1.4.5"=>{}}}},
"journey 1.0.4"=>{"journey 1.0.4"=>{}},
"sprockets 2.2.2"=>
{"sprockets 2.2.2"=>
{"hike 1.2.1"=>{"hike 1.2.1"=>{}},
"multi_json 1.8.2"=>{"multi_json 1.8.2"=>{}},
"rack 1.4.5"=>{"rack 1.4.5"=>{}},
"tilt 1.4.1"=>{"tilt 1.4.1"=>{}}}},
"erubis 2.7.0"=>{"erubis 2.7.0"=>{}}}},
"activerecord 3.2.12"=>
{"activerecord 3.2.12"=>
{"activesupport 3.2.12"=>
{"activesupport 3.2.12"=>
{"i18n 0.6.4"=>{"i18n 0.6.4"=>{}},
"multi_json 1.8.2"=>{"multi_json 1.8.2"=>{}}}},
"activemodel 3.2.12"=>
{"activemodel 3.2.12"=>
{"activesupport 3.2.12"=>
{"activesupport 3.2.12"=>
{"i18n 0.6.4"=>{"i18n 0.6.4"=>{}},
"multi_json 1.8.2"=>{"multi_json 1.8.2"=>{}}}},
"builder 3.0.4"=>{"builder 3.0.4"=>{}}}},
"arel 3.0.2"=>{"arel 3.0.2"=>{}},
"tzinfo 0.3.37"=>{"tzinfo 0.3.37"=>{}}}},
"activeresource 3.2.12"=>
{"activeresource 3.2.12"=>
{"activesupport 3.2.12"=>
{"activesupport 3.2.12"=>
{"i18n 0.6.4"=>{"i18n 0.6.4"=>{}},
"multi_json 1.8.2"=>{"multi_json 1.8.2"=>{}}}},
"activemodel 3.2.12"=>
{"activemodel 3.2.12"=>
{"activesupport 3.2.12"=>
{"activesupport 3.2.12"=>
{"i18n 0.6.4"=>{"i18n 0.6.4"=>{}},
"multi_json 1.8.2"=>{"multi_json 1.8.2"=>{}}}},
"builder 3.0.4"=>{"builder 3.0.4"=>{}}}}}},
"actionmailer 3.2.12"=>
{"actionmailer 3.2.12"=>
{"actionpack 3.2.12"=>
{"actionpack 3.2.12"=>
{"activesupport 3.2.12"=>
{"activesupport 3.2.12"=>
{"i18n 0.6.4"=>{"i18n 0.6.4"=>{}},
"multi_json 1.8.2"=>{"multi_json 1.8.2"=>{}}}},
"activemodel 3.2.12"=>
{"activemodel 3.2.12"=>
{"activesupport 3.2.12"=>
{"activesupport 3.2.12"=>
{"i18n 0.6.4"=>{"i18n 0.6.4"=>{}},
"multi_json 1.8.2"=>{"multi_json 1.8.2"=>{}}}},
"builder 3.0.4"=>{"builder 3.0.4"=>{}}}},
"rack-cache 1.2"=>
{"rack-cache 1.2"=>{"rack 1.4.5"=>{"rack 1.4.5"=>{}}}},
"builder 3.0.4"=>{"builder 3.0.4"=>{}},
"rack 1.4.5"=>{"rack 1.4.5"=>{}},
"rack-test 0.6.2"=>
{"rack-test 0.6.2"=>{"rack 1.4.5"=>{"rack 1.4.5"=>{}}}},
"journey 1.0.4"=>{"journey 1.0.4"=>{}},
"sprockets 2.2.2"=>
{"sprockets 2.2.2"=>
{"hike 1.2.1"=>{"hike 1.2.1"=>{}},
"multi_json 1.8.2"=>{"multi_json 1.8.2"=>{}},
"rack 1.4.5"=>{"rack 1.4.5"=>{}},
"tilt 1.4.1"=>{"tilt 1.4.1"=>{}}}},
"erubis 2.7.0"=>{"erubis 2.7.0"=>{}}}},
"mail 2.4.4"=>
{"mail 2.4.4"=>
{"mime-types 1.21"=>{"mime-types 1.21"=>{}},
"treetop 1.4.12"=>
{"treetop 1.4.12"=>{"polyglot 0.3.3"=>{"polyglot 0.3.3"=>{}}}},
"i18n 0.6.4"=>{"i18n 0.6.4"=>{}}}}}},
"railties 3.2.12"=>
{"railties 3.2.12"=>
{"rake 10.1.0"=>{"rake 10.1.0"=>{}},
"rack-ssl 1.3.3"=>
{"rack-ssl 1.3.3"=>{"rack 1.4.5"=>{"rack 1.4.5"=>{}}}},
"thor 0.18.1"=>{"thor 0.18.1"=>{}},
"rdoc 3.12.2"=>{"rdoc 3.12.2"=>{"json 1.8.1"=>{"json 1.8.1"=>{}}}},
"activesupport 3.2.12"=>
{"activesupport 3.2.12"=>
{"i18n 0.6.4"=>{"i18n 0.6.4"=>{}},
"multi_json 1.8.2"=>{"multi_json 1.8.2"=>{}}}},
"actionpack 3.2.12"=>
{"actionpack 3.2.12"=>
{"activesupport 3.2.12"=>
{"activesupport 3.2.12"=>
{"i18n 0.6.4"=>{"i18n 0.6.4"=>{}},
"multi_json 1.8.2"=>{"multi_json 1.8.2"=>{}}}},
"activemodel 3.2.12"=>
{"activemodel 3.2.12"=>
{"activesupport 3.2.12"=>
{"activesupport 3.2.12"=>
{"i18n 0.6.4"=>{"i18n 0.6.4"=>{}},
"multi_json 1.8.2"=>{"multi_json 1.8.2"=>{}}}},
"builder 3.0.4"=>{"builder 3.0.4"=>{}}}},
"rack-cache 1.2"=>
{"rack-cache 1.2"=>{"rack 1.4.5"=>{"rack 1.4.5"=>{}}}},
"builder 3.0.4"=>{"builder 3.0.4"=>{}},
"rack 1.4.5"=>{"rack 1.4.5"=>{}},
"rack-test 0.6.2"=>
{"rack-test 0.6.2"=>{"rack 1.4.5"=>{"rack 1.4.5"=>{}}}},
"journey 1.0.4"=>{"journey 1.0.4"=>{}},
"sprockets 2.2.2"=>
{"sprockets 2.2.2"=>
{"hike 1.2.1"=>{"hike 1.2.1"=>{}},
"multi_json 1.8.2"=>{"multi_json 1.8.2"=>{}},
"rack 1.4.5"=>{"rack 1.4.5"=>{}},
"tilt 1.4.1"=>{"tilt 1.4.1"=>{}}}},
"erubis 2.7.0"=>{"erubis 2.7.0"=>{}}}}}},
"bundler 1.3.5"=>{"bundler 1.3.5"=>{}}}}
答案 1 :(得分：7)
$ gem dependency nokogiri -R
将为您提供类似
的列表 Gem nokogiri-1.6.0
hoe (~> 2.16, development)
hoe-bundler (>= 1.1, development)
hoe-debugging (>= 1.0.3, development)
hoe-gemspec (>= 1.0, development)
hoe-git (>= 1.4, development)
mini_portile (~> 0.5.0)
minitest (~> 2.2.2, development)
racc (>= 1.4.6, development)
rake (>= 0.9, development)
rake-compiler (~> 0.8.0, development)
rdoc (~> 3.10, development)
rexical (>= 1.0.5, development)
Used by
haml-4.0.3 (nokogiri (>= 0, development))
mime-types-1.23 (nokogiri (~> 1.5, development))
redcarpet-2.3.0 (nokogiri (>= 0, development))
tilt-1.4.1 (nokogiri (>= 0, development))
在输出中包含反向依赖
有关$ gem dependency http://guides.rubygems.org/command-reference/#gem_dependency
<强>更新
根据我在网上所做的研究，在向同事和其他人询问这个问题后，我得出结论，目前无法使用$ gem dependency找出完整的递归宝石依赖项列表。
编写类似于您在更新的问题中指出的宝石的宝石不应该非常复杂。我相信人们可以通过编写一个简单的递归循环并获取宝石信息（也许是一种理想的格式）来做到这一点。
我认为我放弃了这个主题，但有人可以为其他人（不是我）开始赏金，他们可以想到“获得递归宝石依赖的最佳方式”除了 https://www.gemlou.pe 我认为很好。