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https://github.com/grimen/yaml2env

Stash environment-specific configs in YAML-files and load them into ENV according to best-practices pattern - and auto-detects on-initialization if something is missing (skipping the "scratching the head"-part).
https://github.com/grimen/yaml2env

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Stash environment-specific configs in YAML-files and load them into ENV according to best-practices pattern - and auto-detects on-initialization if something is missing (skipping the "scratching the head"-part).

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h1. YAML2ENV "!https://secure.travis-ci.org/merchii/yaml2env.png!":http://travis-ci.org/merchii/yaml2env

_Stash environment-specific configs in YAML-files and load them into ENV according to best-practices pattern - and auto-detects on-initialization if something is missing (skipping the "scratching the head"-part)._

h2. Motivation

For some rainy day...or next commit.

h2. Frameworks

@Yaml2env@ detects lean defaults for: *"Rack":https://github.com/rack/rack*, *"Rails":https://github.com/rails/rails*, and *"Sinatra":https://github.com/sinatra/sinatra*. Though by setting @Yaml2env.env@ and @Yaml2env.root@ manually you are good with any Ruby-project.

h2. Installation

Add to your @Gemfile@:


gem 'yaml2env'

...and @bundle install@.

h2. Usage

To give this some context; this is how we use @Yaml2env@ to initialize "Hoptoad":http://hoptoadapp.com:


Yaml2env.require! 'config/hoptoad.yml', {'HOPTOAD_API_KEY' => 'api_key'}

# ...or if a warning note in the logs is enough:
# Yaml2env.require 'config/hoptoad.yml', {'HOPTOAD_API_KEY' => 'api_key'}

if defined?(HoptoadNotifier)
HoptoadNotifier.configure do |config|
config.api_key = ENV['HOPTOAD_API_KEY']
end
end

...and the corresponding YAML config file:


development:
api_key: NONE

staging:
api_key: 123abc

production:
api_key: abc123

test:
api_key: NONE

...which will yield:


# For: Rails.env => 'development'
ENV['HOPTOAD_API_KEY']
=> 'NONE'

# For: Rails.env => 'staging'
ENV['HOPTOAD_API_KEY']
=> '123abc'

# For: Rails.env => 'production'
ENV['HOPTOAD_API_KEY']
=> 'abc123'

# For: Rails.env => 'test'
ENV['HOPTOAD_API_KEY']
=> 'NONE'

# For: Rails.env => 'other'
=> STDOUT: "Failed to load required config for environment 'other': /Users/grimen/development/example.com/config/hoptoad.yml"

h2. API

Being lazy and just dropping a lot of examples here.

*@Yaml2env.require@*


# Case: If config file exists with proper keys
Yaml2env.require 'config/hoptoad.yml', {'HOPTOAD_API_KEY' => 'api_key'}
=> true
Yaml2env.require 'config/hoptoad.yml', {'HOPTOAD_API_KEY' => 'api_key'}
=> false + STDOUT: (already loaded warning)

# Case: If config file don't exists, or it don't contain expected setting-key(s)
Yaml2env.require 'config/hoptoad2.yml', {'HOPTOAD_API_KEY' => 'api_key'}
=> false + STDOUT: (invalid file or missing key warning)

*@Yaml2env.require!@*

See above: Same as @Yaml2env.require@ but raises error instead of log warning.

*@Yaml2env.load@*


# Case: If config file exists with proper keys
Yaml2env.load 'config/hoptoad.yml', {'HOPTOAD_API_KEY' => 'api_key'}
=> true

# Case: If config file don't exists, or it don't contain expected setting-key(s)
Yaml2env.load 'config/hoptoad.yml', {'HOPTOAD_API_KEY' => 'api_key'}
=> STDOUT: (warning)

*@Yaml2env.load!@*

See above: Same as @Yaml2env.require@ but raises error instead of log warning.

*@Yaml2env.assert_keys@*


Yaml2env.assert_keys 'HOPTOAD_API_KEY'
=> true

Yaml2env.assert_keys 'BAZOOKA'
=> false + STDOUT: (warning)

*@Yaml2env.assert_keys!@*

See above: Same as @Yaml2env.assert_keys@ but raises error instead of log warning.

*@Yaml2env.assert_values@*


Yaml2env.assert_values 'HOPTOAD_API_KEY' => /[a-z0-9]+/
=> true

Yaml2env.assert_values 'HOPTOAD_API_KEY' => /[0-9]+/
=> false + STDOUT: (warning)

*@Yaml2env.assert_values!@*

See above: Same as @Yaml2env.assert_values@ but raises error instead of log warning.

*@Yaml2env.log_root@*


Yaml2env.log_root
=> STDOUT: :: Yaml2env.root = '/path/to/project/root'

*@Yaml2env.log_env@*


Yaml2env.log_env
=> STDOUT: :: Yaml2env.env = 'development' (default)

*@Yaml2env.log_values@*


Yaml2env.log_values
=> STDOUT: :: ENV = {'HOPTOAD_API_KEY' => 'api_key', 'RUBY_VERSION' => 'ruby-1.9.3-p0', ...}

Yaml2env.log_values 'HOPTOAD_API_KEY'
=> STDOUT: :: ENV = {'HOPTOAD_API_KEY' => 'api_key'}

Yaml2env.log_values 'BAZOOKA'
=> STDOUT: :: ENV = {}

Yaml2env.log_values /RACK|MERCHII/
=> STDOUT: :: ENV = {'RACK_ENV' => 'api_key', 'MERCHII_ASSETS_DOMAIN' => 'assets.merchii.com'}

*@Yaml2env.detect_root!@*


# For: Rack, Sinatra, Rails, or Yaml2env.default_env is set
Yaml2env.detect_root!
=> Yaml2env.root = '/path/to/project/root'

# For: Failed detection
Yaml2env.detect_root!
=> DetectionFailedError

*@Yaml2env.detect_env!@*


# For: Rack, Sinatra, Rails, or Yaml2env.default_env is set
Yaml2env.detect_env!
=> Yaml2env.env = ENV['RACK_ENV'] # ...example for Rack

# For: Failed detection
Yaml2env.detect_env!
=> DetectionFailedError

# For: Default environment set
Yaml2env.default_env = 'development'
Yaml2env.detect_env!
=> Yaml2env.env = 'development'

*@Yaml2env.loaded@*


Yaml2env.loaded
=> STDOUT: '/path/to/project/root/config/hoptoad.yml' => {'HOPTOAD_API_KEY' => 'abc123'}

There are a few more, but these are the most useful ones.

h2. Notes

This gem was developed for our own requirements at *"Merchii":http://github.com/merchii*, so feel free to send pull-requests with enhancements of any kind (features, bug-fixes, documentation, tests, etc.) to make it better or useful for you as well.

h2. License

Released under the MIT license.
Copyright (c) "Jonas Grimfelt":http://github.com/grimen, "Merchii":http://github.com/merchii