IRB未加载库libreadline

Question

尝试进入irb，但突然开始收到此错误。尝试重新安装brew readline并重新链接，但没有成功。有什么建议吗？

/Users/asahmed/.rbenv/versions/2.4.2/lib/ruby/2.4.0/rubygems/core_ext/kernel_require.rb:55:in `require': dlopen(/Users/asahmed/.rbenv/versions/2.4.2/lib/ruby/2.4.0/x86_64-darwin17/readline.bundle, 9): Library not loaded: /usr/local/opt/readline/lib/libreadline.7.dylib (LoadError)
  Referenced from: /Users/asahmed/.rbenv/versions/2.4.2/lib/ruby/2.4.0/x86_64-darwin17/readline.bundle
  Reason: image not found - /Users/asahmed/.rbenv/versions/2.4.2/lib/ruby/2.4.0/x86_64-darwin17/readline.bundle
    from /Users/asahmed/.rbenv/versions/2.4.2/lib/ruby/2.4.0/rubygems/core_ext/kernel_require.rb:55:in `require'
    from /Users/asahmed/.rbenv/versions/2.4.2/lib/ruby/2.4.0/irb/ext/save-history.rb:12:in `<top (required)>'
    from /Users/asahmed/.rbenv/versions/2.4.2/lib/ruby/2.4.0/rubygems/core_ext/kernel_require.rb:55:in `require'
    from /Users/asahmed/.rbenv/versions/2.4.2/lib/ruby/2.4.0/rubygems/core_ext/kernel_require.rb:55:in `require'
    from /Users/asahmed/.rbenv/versions/2.4.2/lib/ruby/2.4.0/irb/extend-command.rb:243:in `save_history='
    from /Users/asahmed/.rbenv/versions/2.4.2/lib/ruby/2.4.0/irb/context.rb:92:in `initialize'
    from /Users/asahmed/.rbenv/versions/2.4.2/lib/ruby/2.4.0/irb.rb:412:in `new'
    from /Users/asahmed/.rbenv/versions/2.4.2/lib/ruby/2.4.0/irb.rb:412:in `initialize'
    from /Users/asahmed/.rbenv/versions/2.4.2/lib/ruby/2.4.0/irb.rb:383:in `new'
    from /Users/asahmed/.rbenv/versions/2.4.2/lib/ruby/2.4.0/irb.rb:383:in `start'
    from /Users/asahmed/.rbenv/versions/2.4.2/bin/irb:11:in `<main>'

Answer 1

你可能已经升级了一些替换了readline库的东西，现在有必要重新构建你的Ruby了。当您运行brew clean时，这种事情在Ruby中很少发生，并且它删除了一个过时版本的依赖项，而没有意识到您的某个Homebrew构建依赖于它。这是因为Rbenv没有办法与Homebrew沟通它仍然需要这个库。

这通常很容易修复。尝试：

rbenv install 2.4.2

您可能还想花点时间更新到最新版本，目前是2.5.3。