Class: Json2::Option

Inherits:
Object
  • Object
show all
Defined in:
lib/json2/option.rb

Overview

Process command line switches.

The keys you are going to use:

:without_header - Boolean, if true the user want to parse the Json

file as if it has no header data.

:with_path - Boolean, if true the user wants to extract only

a particular path in the Json file.

:path - This is the String path to extract if :with_path

is true.

Examples

opt = Option.new
if opt[:with_path]
  puts "Extracting #{opt[:path]}…"
  # Do the job.
end

Instance Method Summary collapse

Constructor Details

#initialize ⇒ Option

Creates a new Option instance.



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# File 'lib/json2/option.rb', line 24

def initialize
  @options = { without_header: false, with_path: false }

  optparse = OptionParser.new {|opts| parse(opts) }

  begin
    optparse.parse!
  rescue OptionParser::InvalidOption => exception
    puts exception.to_s
    exit 1
  end

  print_version if @options[:version]
end

Instance Method Details

#[](key) ⇒ Object

Get an option.

key - The Symbol name of the option to get.

Returns Any value corresponding of the key, or nil if the key

doesn't exists.



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# File 'lib/json2/option.rb', line 45

def [](key)
  @options[key]
end

#parse(opts) ⇒ Object 



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# File 'lib/json2/option.rb', line 49

def parse(opts)
  opts.on('-w', '--without-header', 'Output csv without a header') do
    @options[:without_header] = true
  end
  opts.on('-p', '--path PATH', 'Extract only this path') do |arg|
    @options[:with_path] = true
    @options[:path] = arg
  end
  opts.on('-v', '--version', 'Print version number and exit') do
    @options[:version] = true
  end
  opts.on('-h', '--help', 'Display this screen') do
    puts opts
    exit
  end
end