Ruby Glimmer运行示例抛出NameError异常，求解决方法

问题描述 #

按照RubyConf workshop教程操作，已执行gem install glimmer-dsl-libui成功安装glimmer（2.7.6）和glimmer-dsl-libui（0.11.8），但运行glimmer examples时抛出如下错误：

Traceback (most recent call last):
    27: from /Users/marion/.rvm/gems/ruby-2.7.6/bin/glimmer:23:in `<main>'
    26: from /Users/marion/.rvm/gems/ruby-2.7.6/bin/glimmer:23:in `load'
    25: from /Users/marion/.rvm/gems/ruby-2.7.6/gems/glimmer-dsl-libui-0.11.8/bin/glimmer:24:in `<top (required)>'
    24: from /Users/marion/.rvm/gems/ruby-2.7.6/gems/glimmer-dsl-libui-0.11.8/bin/glimmer:24:in `require_relative'
    23: from /Users/marion/.rvm/gems/ruby-2.7.6/gems/glimmer-dsl-libui-0.11.8/lib/glimmer-dsl-libui.rb:39:in `<top (required)>'
    22: from /Users/marion/.rvm/rubies/ruby-2.7.6/lib/ruby/2.7.0/rubygems/core_ext/kernel_require.rb:83:in `require'
    21: from /Users/marion/.rvm/rubies/ruby-2.7.6/lib/ruby/2.7.0/rubygems/core_ext/kernel_require.rb:83:in `require'
    20: from /Users/marion/.rvm/gems/ruby-2.7.6/gems/glimmer-dsl-libui-0.11.8/lib/glimmer/dsl/libui/dsl.rb:23:in `<top (required)>'
    19: from /Users/marion/.rvm/gems/ruby-2.7.6/gems/glimmer-dsl-libui-0.11.8/lib/glimmer/dsl/libui/dsl.rb:23:in `each'
    18: from /Users/marion/.rvm/gems/ruby-2.7.6/gems/glimmer-dsl-libui-0.11.8/lib/glimmer/dsl/libui/dsl.rb:23:in `block in <top (required)>'
    17: from /Users/marion/.rvm/rubies/ruby-2.7.6/lib/ruby/2.7.0/rubygems/core_ext/kernel_require.rb:83:in `require'
    16: from /Users/marion/.rvm/rubies/ruby-2.7.6/lib/ruby/2.7.0/rubygems/core_ext/kernel_require.rb:83:in `require'
    15: from /Users/marion/.rvm/gems/ruby-2.7.6/gems/glimmer-dsl-libui-0.11.8/lib/glimmer/dsl/libui/tab_item_expression.rb:23:in `<top (required)>'
    14: from /Users/marion/.rvm/rubies/ruby-2.7.6/lib/ruby/2.7.0/rubygems/core_ext/kernel_require.rb:83:in `require'
    13: from /Users/marion/.rvm/rubies/ruby-2.7.6/lib/ruby/2.7.0/rubygems/core_ext/kernel_require.rb:83:in `require'
    12: from /Users/marion/.rvm/gems/ruby-2.7.6/gems/glimmer-dsl-libui-0.11.8/lib/glimmer/libui/control_proxy/tab_item_proxy.rb:22:in `<top (required)>'
    11: from /Users/marion/.rvm/rubies/ruby-2.7.6/lib/ruby/2.7.0/rubygems/core_ext/kernel_require.rb:83:in `require'
    10: from /Users/marion/.rvm/rubies/ruby-2.7.6/lib/ruby/2.7.0/rubygems/core_ext/kernel_require.rb:83:in `require'
     9: from /Users/marion/.rvm/gems/ruby-2.7.6/gems/glimmer-dsl-libui-0.11.8/lib/glimmer/libui/control_proxy.rb:425:in `<top (required)>'
     8: from /Users/marion/.rvm/gems/ruby-2.7.6/gems/glimmer-dsl-libui-0.11.8/lib/glimmer/libui/control_proxy.rb:425:in `each'
     7: from /Users/marion/.rvm/gems/ruby-2.7.6/gems/glimmer-dsl-libui-0.11.8/lib/glimmer/libui/control_proxy.rb:425:in `block in <top (required)>'
     6: from /Users/marion/.rvm/rubies/ruby-2.7.6/lib/ruby/2.7.0/rubygems/core_ext/kernel_require.rb:83:in `require'
     5: from /Users/marion/.rvm/rubies/ruby-2.7.6/lib/ruby/2.7.0/rubygems/core_ext/kernel_require.rb:83:in `require'
     4: from /Users/marion/.rvm/gems/ruby-2.7.6/gems/glimmer-dsl-libui-0.11.8/lib/glimmer/libui/control_proxy/text_proxy.rb:27:in `<top (required)>'
     3: from /Users/marion/.rvm/gems/ruby-2.7.6/gems/glimmer-dsl-libui-0.11.8/lib/glimmer/libui/control_proxy/text_proxy.rb:28:in `<module:Glimmer>'
     2: from /Users/marion/.rvm/gems/ruby-2.7.6/gems/glimmer-dsl-libui-0.11.8/lib/glimmer/libui/control_proxy/text_proxy.rb:29:in `<module:LibUI>'
     1: from /Users/marion/.rvm/gems/ruby-2.7.6/gems/glimmer-dsl-libui-0.11.8/lib/glimmer/libui/control_proxy/text_proxy.rb:33:in `<class:ControlProxy>'
/Users/marion/.rvm/gems/ruby-2.7.6/gems/glimmer-dsl-libui-0.11.8/lib/glimmer/libui/control_proxy/text_proxy.rb:35:in `<class:TextProxy>': uninitialized constant Glimmer::LibUI::ControlProxy::TextProxy::PerfectShaped (NameError)

原因分析 #

这个错误是由于PerfectShaped库缺失导致的。PerfectShaped是glimmer生态中的依赖组件，当前安装的glimmer（2.7.6）与glimmer-dsl-libui（0.11.8）版本组合存在依赖不兼容问题，导致gem安装过程中没有自动引入所需的PerfectShaped库。

解决方法 #

• 升级glimmer到兼容版本：

  gem update glimmer
  

  升级完成后重新运行glimmer examples。

• 重新安装兼容版本的gem组合：

  gem uninstall glimmer glimmer-dsl-libui
  gem install glimmer-dsl-libui --version latest
  

  让gem自动处理所有依赖的版本匹配。

• 手动安装PerfectShaped：

  gem install perfect_shaped
  

  安装完成后再尝试运行命令。

内容的提问来源于stack exchange，提问作者MDickten