optionparser pass an array to ruby file

Question

I have a trouble with passing an arguments to my ruby file. IE,

OptionParser.new do |opts|
  opts.banner = 'Usage: mp3split.rb [options]'

  opts.on('-f', '--filename fName1,fName2,fName3', Array, 'absolute or relative pathes to file') { |f| options[:filenames] = f }
end.parse!

This approach requires me to write this commands:

ruby mp3split.rb --filename fursov_13.mp3,fursov_14.mp3,fursov_14_2.mp3,fursov_15.mp3,fursov_16.mp3,fursov_17.mp3

But I want to get array by this:

ruby mp3split.rb --filename fursov_13.mp3 fursov_14.mp3 fursov_14_2.mp3 fursov_15.mp3 fursov_16.mp3 fursov_17.mp3

How can I implement this functionality? I can't find anything helpful about this in docs.

Aleksei Matiushkin · Accepted Answer · 2015-04-29 09:00:26Z

3

With OptionParser you can’t. There is a workaround, though, when there is the only list you need to handle that way and you won’t pass other arguments to the script. OptionParser splits the input by spaces before it processes it. The unkeyed arguments remain in ARGV global constant after parsing. Assuming everything described above is met, here we go:

OptionParser.new do |opts|
  options[:filenames] = []
  opts.banner = 'Usage: mp3split.rb [options]'        
  opts.on('-f', '--filename fName1 fName2 fName3', Array, 
          'absolute or relative pathes to file') do |f|
    options[:filenames] |= [*f]
  end
end.parse!

options[:filenames] |= ARGV

I apparently fixed another glitch within your code: options[:filenames] should be appended not overwritten on every occurence of -f switch, OptionParser supports script -f f1 -f f2 -f f3.

answered Apr 29, 2015 at 9:00

Aleksei Matiushkin

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6 Comments

Alex Antonov Over a year ago

Maybe you mean options[:filenames] ||= ARGV instead of options[:filenames] |= ARGV ? I can't find |= method in the ruby api

Aleksei Matiushkin Over a year ago

a |= b is a ruby-wide shorthand for a = a | b. On arrays it is a union.

Alex Antonov Over a year ago

Thanks, but I want exactly what I want. Is there any other ruby libraries?

Aleksei Matiushkin Over a year ago

How do you expect this parser to handle -f a.txt -g where -g is perfectly valid existing file name?

Alex Antonov Over a year ago

I needn't -g flag in my parser :)

|

Roman Gaufman · Accepted Answer · 2023-04-22 23:45:41Z

I was shocked to learn that OptionParter can't do such a simple thing, so I switched to Thor, for example:

require 'thor'

class EmqxCLI < Thor
  desc 'add_user USER_ID PASSWORD [IS_SUPERUSER]', 'Add a user (optional: set true/false for is_superuser)'
  def add_user(user_id, password, is_superuser = false)
    emqx = EmqxApi.new
    emqx.add_user(user_id, password, is_superuser)
  end

  desc 'remove_user USER_ID', 'Remove a user'
  def remove_user(user_id)
    emqx = EmqxApi.new
    emqx.remove_user(user_id)
  end

  desc 'list_users', 'List users'
  def list_users
    emqx = EmqxApi.new
    emqx.list_users
  end
end

EmqxCLI.start(ARGV)

Which I can now run with:

$ ruby emqx.rb add_user user1 pass1

It also generates a lovely output when running without arguments:

# ruby emqx.rb
Commands:
  emqx.rb add_user USER_ID PASSWORD [IS_SUPERUSER]  # Add a user (optional: set true/false for is_superuser)
  emqx.rb help [COMMAND]                            # Describe available commands or one specific command
  emqx.rb list_users                                # List users
  emqx.rb remove_user USER_ID                       # Remove a user

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