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A simple Gem to add YAML configuration files to your Ruby script / Gem.

A WORK IN PROGRESS, Not really ready for production use. The API may be subject to changes before hitting version 1.0.0

This will add a class that takes care of all your configuration needs for Ruby scripts and Gems.


Add this line to your application's Gemfile:

gem 'confoog'

And then execute:

$ bundle

Or install it yourself as:

$ gem install confoog


Currently Confoog will not allow 'nested' configuration types, however each variable can be an array or hash so multiple settings can be recorded for each variable and accessed (for a hash) by settings[variable][hash_key] or array using settings[array].each. In other words, treat the return from settings[var] as the type it contains. See examples below.

require 'confoog'

settings =
settings[:var] = value
settings[:array] = [1, 2, 3, 4]
settings[42] = "Meaning of life"
settings[:urls] = ["", ""]

settings[:urls].each do |url|
  puts url
# => ["", ""]

# => nil

a_variable = 50
settings[a_variable] = {:one => "for the money", :two => "for the show", :three => "to get ready"}
# => {:one=>"for the money", :two=>"for the show", :three=>"to get ready"}
# => "for the show" # save all current parameters to the YAML file

settings.load # load the settings from YAML file.

Confoog will take several parameters on creation, to specify the default config file and location. For example :

settings = '/home/myuser', filename: '.foo-settings')

There are other optional flags or variables that can be passed on creation:

# Should a missing configuration file be created or not
create_file: true | false

# Specify an optional prefix before any error messages
prefix: 'My Application'

# Should we avoid outputting errors to the console? (ie in a GUI app)
quiet: true | false

If these are not specified, Confoog will use the following defaults :

location: '~/'
filename: '.confoog'
create_file: false
prefix: 'Configuration'
quiet: false

Confoog will set the following error constants which will be returned in the .status['errors'] variable as needed :

ERR_NO_ERROR = 0 # no error condition, command was succesfull
ERR_FILE_NOT_EXIST = 1 # specified configuration file does not exist
ERR_CANT_CHANGE = 2 # directory and file can only be specified through `.new()`
ERR_CANT_CREATE_FILE = 4 # cannot create the requested configuration file
ERR_NOT_WRITING_EMPTY_FILE = 8 # not attempting to save an empty configuration
ERR_CANT_SAVE_CONFIGURATION = 16 # Failed to save the configuration file
ERR_NOT_LOADING_EMPTY_FILE = 32 # not atempting to load an empty config file

INFO_FILE_CREATED = 256 # Information - specified file was created
INFO_FILE_LOADED = 512 # Information - Config file was loaded successfully

These are generally to do with existence and creation of configuration files.

To Do

Thoughts in no particular order.

  • Restrict configuration variables to a specified subset, or to only those that already exist in the YAML file.
  • A better way of dealing with multi-level variables - i.e. nested arrays, hashes etc.
  • option to save config file after any config variables are changed, not just explicitly with


After checking out the repo, run bin/setup to install dependencies. Then, run rake spec to run the tests (or simply rake). You can also run bin/console for an interactive prompt that will allow you to experiment.

To install this gem onto your local machine, run bundle exec rake install.


  1. Fork it
  2. Create your feature branch (git checkout -b my-new-feature)
  3. Commit your changes (git commit -am 'Add some feature')
  4. Push to the branch (git push origin my-new-feature)
  5. Create new Pull Request


This library aims to adhere to Semantic Versioning 2.0.0. Violations of this scheme should be reported as bugs. Specifically, if a minor or patch version is released that breaks backward compatibility, that version should be immediately yanked and/or a new version should be immediately released that restores compatibility. Breaking changes to the public API will only be introduced with new major versions. As a result of this policy, you can (and should) specify a dependency on this gem using the Pessimistic Version Constraint with two digits of precision. For example:

spec.add_dependency 'confoog', '~> 1.0'

Of course, currently we have not even reached version 1, so leave off the version requirement completely. Expect any and all of the API and interface to change!


The gem is available as open source under the terms of the MIT License.