使用ruby的OptionParser解析子命令

发布于 2024-08-31 07:54:37 字数 292 浏览 7 评论 0原文

我希望能够使用 ruby 的 OptionParser 来解析

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

以下形式的子命令：

git branch -a
gem list foo

我知道我可以切换到不同的选项解析器库（如 Trollop），但我有兴趣学习如何从内部执行此操作OptionParser，因为我想更好地学习这个库。

有什么建议吗？

原文

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]]

like:

git branch -a
gem list foo

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.

Any tips?

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暖风昔人 2024-09-07 07:54:37

想通了。我需要使用 OptionParser#order! 。它将解析从 ARGV 开头开始的所有选项，直到找到非选项（不是选项参数），从 ARGV 中删除它处理的所有内容，并且然后它就会退出。

所以我只需要做类似的事情：

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!

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.

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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我也只是我 2024-09-07 07:54:37

看起来 OptionParser 语法已经改变了一些。我必须使用以下内容，以便参数数组具有 opts 对象未解析的所有选项。

begin
  opts.order!(arguments)
rescue OptionParser::InvalidOption => io
  # Prepend the invalid option onto the arguments array
  arguments = io.recover(arguments)
rescue => e
  raise "Argument parsing failed: #{e.to_s()}"
end

It looks like the OptionParser syntax has changed some. I had to use the following so that the arguments array had all of the options not parsed by the opts object.

begin
  opts.order!(arguments)
rescue OptionParser::InvalidOption => io
  # Prepend the invalid option onto the arguments array
  arguments = io.recover(arguments)
rescue => e
  raise "Argument parsing failed: #{e.to_s()}"
end

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紅太極 2024-09-07 07:54:37

GLI 是必经之路，https://github.com/davetron5000/gli。教程摘录：

#!/usr/bin/env ruby
require 'gli'
require 'hacer'

include GLI::App

program_desc 'A simple todo list'

flag [:t,:tasklist], :default_value => File.join(ENV['HOME'],'.todolist')

pre do |global_options,command,options,args|
  $todo_list = Hacer::Todolist.new(global_options[:tasklist])
end

command :add do |c|
  c.action do |global_options,options,args|
    $todo_list.create(args)
  end
end

command :list do |c|
  c.action do
    $todo_list.list.each do |todo|
      printf("%5d - %s\n",todo.todo_id,todo.text)
    end
  end
end

command :done do |c|
  c.action do |global_options,options,args|
    id = args.shift.to_i
    $todo_list.list.each do |todo|
      $todo_list.complete(todo) if todo.todo_id == id
    end
  end
end

exit run(ARGV)

您可以在 http://davetron5000.github.io/gli/ 找到该教程。

GLI is the way to go, https://github.com/davetron5000/gli. An excerpt from a tutorial:

#!/usr/bin/env ruby
require 'gli'
require 'hacer'

include GLI::App

program_desc 'A simple todo list'

flag [:t,:tasklist], :default_value => File.join(ENV['HOME'],'.todolist')

pre do |global_options,command,options,args|
  $todo_list = Hacer::Todolist.new(global_options[:tasklist])
end

command :add do |c|
  c.action do |global_options,options,args|
    $todo_list.create(args)
  end
end

command :list do |c|
  c.action do
    $todo_list.list.each do |todo|
      printf("%5d - %s\n",todo.todo_id,todo.text)
    end
  end
end

command :done do |c|
  c.action do |global_options,options,args|
    id = args.shift.to_i
    $todo_list.list.each do |todo|
      $todo_list.complete(todo) if todo.todo_id == id
    end
  end
end

exit run(ARGV)

You can find the tutorial at http://davetron5000.github.io/gli/.

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