From: ljjarvis@...
Date: 2015-05-29T12:00:07+00:00
Subject: [ruby-core:69417] [Ruby trunk - Feature #11191] Add #to_h method to	OptionParser

Issue #11191 has been updated by Lee Jarvis.


> You want symbols, I'm guessing for kwargs?

Sure, but not necessarily just for that. It's very common to see these config hashes contain symbol keys, so no reason to not provide them as such.

----------------------------------------
Feature #11191: Add #to_h method to OptionParser
https://bugs.ruby-lang.org/issues/11191#change-52689

* Author: Lee Jarvis
* Status: Feedback
* Priority: Normal
* Assignee: Nobuyoshi Nakada
----------------------------------------
Simply collecting configuration values is a very popular use for OptionParser. Code like this is quite common:

~~~ruby
config = {}
opts = OptionParser.new do |o|
  o.on "-h", "--host=HOST", "hostname" do |h|
    config[:host] = h
  end
  o.on "-p", "--port=PORT", "port", Integer do |p|
    config[:port] = p
  end
  o.on "-v", "--verbose" do
    config[:verbose] = true
  end
  o.on "-q", "--quiet" do
    config[:quiet] = true
  end
end
opts.parse!
# do something with config values
~~~

This boilerplate is one of the reasons I built Slop: https://github.com/leejarvis/slop

I'd like to add a `to_h` method to OptionParser which returns a Hash containing the switch name and switch argument values. This would reduce the above example to:

~~~ruby
opts = OptionParser.new do |o|
  o.on "-h", "--host=HOST", "hostname"
  o.on "-p", "--port=PORT", "port", Integer
  o.on "-v", "--verbose"
  o.on "-q", "--quiet"
end
~~~

With this example, the output would look something like:

~~~ruby
opts.parse %w(--host localhost --port 8000 --verbose)
puts opts.to_h #=>
  {:host=>"localhost", :port=>8000, :verbose=>true, :quiet=>nil}
~~~

I've attached a patch that implements this functionality in quite a basic way. I'm very keen to hear what others think.



---Files--------------------------------
0001-Add-to_h-method-to-OptionParser.patch (2.97 KB)


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