如何将条件rubygem需求添加到gem规范？ [英] How do I add conditional rubygem requirements to a gem specification?

问题描述

只有当用户使用特定版本的ruby时，才有可能添加gem依赖关系吗？

背景：在使用Test :: Unit :: Autorunner等的项目分支上工作。它们是Ruby 1.8标准库的一部分，但不是1.9.1中标准库的一部分，而是在测试单元gem中。我想添加一个依赖关系，如果有人使用ruby 1.9.1或更高版本，请安装test-unitgem，但如果他们使用1.8或更低版本，则不需要安装任何东西。

解决方案

如果您查看 gemspec关于add_dependency的文档，没有Ruby版本的选项。也许你可以使用post_install_message属性告诉用户如果他们使用Ruby 1.9来安装gem。

Is it possible to add a gem dependency only if the person is using a certain version of ruby?

Background: I'm working on a fork of a project that uses Test::Unit::Autorunner and the like. They are part of the standard library in ruby 1.8, but aren't part of the standard library in 1.9.1, and is instead in the "test-unit" gem. I want to add a dependency that says that if someone's using ruby 1.9.1 or later, install the "test-unit" gem, but if they're using 1.8 or earlier, they don't need to install anything.

解决方案

If you look at the gemspec documentation for add_dependency, there isn't an option for a ruby version. Perhaps you could use the post_install_message attribute to tell the user to install the gem if they're using ruby 1.9.

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