Ruby popen3 和 ANSI 颜色
我试图让 watchr 在文件更改时自动运行测试，并得到了我需要的大部分工作，除了 RSpec 中的所有 ANSI 颜色都被忽略这一事实。有问题的代码如下：
stdin, stdout, stderr = Open3.popen3(cmd)
stdout.each_line do |line|
last_output = line
puts line
end
当 cmd 等于 rspec spec/**/*.rb 之类的内容时，上面的代码可以正常运行 RSpec，只是所有输出都是单色的。我已经考虑使用 Kernel.system 来代替，但是系统不会返回我需要确定测试是否失败/成功的输出。如何获取从 Ruby 内执行的脚本的输出（包括 ANSI 颜色）并将其输出到控制台？
I am attempting to get watchr running tests automatically as files change, and got most of what I need working except for the fact that all ANSI colours from RSpec are being disregarded. The offending code is as follows:
stdin, stdout, stderr = Open3.popen3(cmd)
stdout.each_line do |line|
last_output = line
puts line
end
When cmd is equal to something like rspec spec/**/*.rb then the above code runs RSpec fine except that all output is in monochrome. I've looked at using Kernel.system instead, however system does not return the output which I need to determine if a test failed / succeeded. How can I get the output form a script that is executed from within Ruby including the ANSI color and output this to the console?
如果你对这篇内容有疑问，欢迎到本站社区发帖提问 参与讨论，获取更多帮助，或者扫码二维码加入 Web 技术交流群。
绑定邮箱获取回复消息
由于您还没有绑定你的真实邮箱，如果其他用户或者作者回复了您的评论，将不能在第一时间通知您！
发布评论
评论（3）
我猜想 rspec 正在检查它正在写入输出的流，看看它是否是 tty（即控制台），如果不是，则禁用颜色。许多命令都可以执行此操作 - 例如 GNU ls 和 grep。由于从子进程到脚本的流不是 tty，因此颜色将被禁用。
希望 rspec 有一个标志，可以强制使用颜色，无论流类型如何。如果没有，你将不得不采取一些真正奇怪的诡计。
I would guess that rspec is examining the stream to which it is writing output to see if it is a tty (ie the console) or not, and if it's not, disabling colour. Many commands do this - GNU ls and grep, for example. Since the stream from the child process to your script is not a tty, colour will be disabled.
Hopefully, rspec has a flag which will force colour to be used, regardless of the stream type. If it doesn't, you will have to resort to some truly weird stty shenanigans.
在决定是否使用颜色输出之前，
rspec工具很可能会检查它是否在终端上交互式运行或从脚本自动运行。文档说您可以使用
--color命令强制颜色行选项。尝试：rspec --color spec/**/*.rb。
Chances are good that the
rspectool is checking to see if it is running interactively on a terminal or being run automatically from a script before deciding to use color output or not.The documentation says you can force color with
--colorcommand line option.Try:
rspec --color spec/**/*.rb.可以通过 PTY 模块在伪终端中运行命令 为了保留用户面对类似终端的行为。功劳归于 tty-command gem 的创建者 (查看此问题）谁在他的 gem 中实现了此行为：
请记住，使用伪终端可能会有不需要的一面效果，例如某些 git 命令使用寻呼机 这本质上会导致命令挂起。因此引入该功能可能是一个突破性的改变。
It's possible to run commands in a pseudo terminal via the PTY module in order to preserve a user facing terminal-like behaviour. Credits go to the creator of the tty-command gem (see this issue) who implemented this behaviour in his gem:
Keep in mind that using a pseudo terminal may have unwanted side effects, such as certain
gitcommands using a pager which will essentially cause commands to hang. So introducing the functionality might be a breaking change.