Class: Kybus::Configuration::Loaders::Arg

Inherits:
Object
  • Object
show all
Includes:
Utils
Defined in:
lib/kybus/configs/loaders/arg.rb

Overview

This class allows to load configurations from ARGV It requires that all the vars are named with a common prefix It uses ‘__’ as a delimiter to allow nested configurations

  • If the arg contains an ‘=’ sym it will take the left string as key and the right as the value

  • If the arg does not contain an ‘=’ it will take the next arg as value

  • If the next arg to an arg is also an arg, it will parse it as a flag.

  • Also if the last element of ARGV is an arg it will be parsed as a flag.

Examples

--config_env_value=3 => { 'env_value' => '3' }
--config_env_value 3 => { 'env_value' => '3' }
--config_env_obj__value 3 => { "env_obj" => { 'value' => '3' } }
--config_flag --config_value 3 => { 'flag' => 'true', value => '3' }

Instance Method Summary collapse

Methods included from Utils

#array_wrap, #parse_type, #recursive_merge, #recursive_set, #split_env_string, #symbolize

Constructor Details

#initialize(env_prefix, manager, array = ARGV) ⇒ Arg

Returns a new instance of Arg.



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# File 'lib/kybus/configs/loaders/arg.rb', line 22

def initialize(env_prefix, manager, array = ARGV)
  @env_prefix = env_prefix.downcase
  @manager = manager
  @array = array
end

Instance Method Details

#extract_value(string, idx) ⇒ Object

Parses a string as described above



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# File 'lib/kybus/configs/loaders/arg.rb', line 44

def extract_value(string, idx)
  if string.include?('=')
    string.split('=')[1]
  elsif @array.size == idx
    'true'
  elsif @array[idx].start_with?('--')
    'true'
  else
    @array[idx]
  end
end

#load! ⇒ Object

Parses configurations from array and returns the value as a hash



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# File 'lib/kybus/configs/loaders/arg.rb', line 29

def load!
  configs = {}
  @array.each_with_index do |obj, idx|
    next unless obj.start_with?('--' + @env_prefix)

    value = extract_value(obj, idx + 1)
    key = obj.split('=').first
             .sub(/^--#{@env_prefix}_?/, '')
             .downcase.split('__')
    recursive_set(configs, key, split_env_string(value))
  end
  configs
end