使用ruby的OptionParser解析子命令 [英] Using ruby's OptionParser to parse sub-commands

问题描述

我希望能够使用ruby的OptionParser来解析形式的子命令

I'd like to be able to use ruby's OptionParser to parse sub-commands of the form

COMMAND [GLOBAL FLAGS] [SUB-COMMAND [SUB-COMMAND FLAGS]]

喜欢:

git branch -a
gem list foo

我知道我可以切换到其他选项解析器库(例如Trollop)，但是我想从OptionParser中学习如何执行此操作，因为我想更好地学习该库.

I know I could switch to a different option parser library (like Trollop), but I'm interested in learning how to do this from within OptionParser, since I'd like to learn the library better.

有什么提示吗?

推荐答案

弄清楚了.我需要使用OptionParser#order!.它将解析ARGV开头的所有选项，直到找到一个非选项(不是选项参数)，然后从ARGV中删除它处理的所有内容，然后退出.

Figured it out. I need to use OptionParser#order!. It will parse all the options from the start of ARGV until it finds a non-option (that isn't an option argument), removing everything it processes from ARGV, and then it will quit.

所以我只需要做类似的事情:

So I just need to do something like:

global = OptionParser.new do |opts|
  # ...
end
subcommands = { 
  'foo' => OptionParser.new do |opts|
     # ...
   end,
   # ...
   'baz' => OptionParser.new do |opts|
     # ...
   end
 }

 global.order!
 subcommands[ARGV.shift].order!

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