YAML configuration loader

###Yaml configuration loader for node js

Installation

---

npm install yaml-configuration-loader

var loader = require('yaml-configuration-loader');

API Reference

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Here is the full list of accessible methods:

Methods

###load( [name,] path )

load and parse a yaml file

Params:

• name: (Optional) String. configuration name. if set, the configuration will be saved.
• path: String. file path

Returns:

• Object. Configuration content

###get( name )

retrieve a loaded configuration

Params:

• name: String. configuration name.

Returns:

• Object. Configuration content

###define( name, value )

define a new constant, it will be used during the configuration parsing

Params:

• name: String. constant name.
• value: Mixed. value.

###clear( )

clear the loaded configuration and the defined constants

Yaml Api Reference

---

Syntaxes

###${env:ENVIRONMENT_VARIABLE}

retrieves the value of an environment variable

Usage:

process.env.foobar = 'foobar_value';

file.yml

foo:
	bar: '${env:foobar}'

loaded configuration (json)

{
	"foo": {
		"bar": "foobar_value"
	}
}

###${const:CONSTANT_VARIABLE}

retrieves the value of a defined constant
by default only one constant is available: APP_PATH
it corresponds to the entry point of your application
it's the only constant which you can override

Usage:

var loader = require('yaml-configuration-loader');
loader.define('foobar','foobar_value');

file.yml

foobar: ${const:APP_PATH}
foo:
	bar: '${const:foobar}'

loaded configuration (json)

{
	"foobar": "foo/bar/app.js",
	"foo": {
		"bar": "foobar_value"
	}
}

###${local:LOCAL_VARIABLE}

retrieves the value of a property from the current configuration

Usage

file.yml

foo:
	foobar : 'foobar_value'
	bar: '${local:foo.foobar}'

loaded configuration (json)

{
	"foo": {
		"foobar": "foobar_value",
		"bar": "foobar_value"
	}
}

###${config:CONFIGURATION_NAME:CONFIGURATION_VARIABLE}

retrieves the value of a defined configuration

Usage:

var loader = require('yaml-configuration-loader');
loader.load('foobar_conf', 'xxx/xxx.yml')

xxx.yml

foo:
	bar: 'bar'

file.yml

foo:
	bar: '${config:foobar_conf:foo.bar}'

loaded configuration (json)

{
	"foo": {
		"bar": "bar"
	}
}

---

you can also add a default value to your dynamic fields with the pipe syntax
by default the library will transform the given value into the most relevant type ${const:foo|12} => "foo": 12, ${const:foo|bar} => "foo": "bar" you can override this behaviour by adding quotes around the value, the parser will consider the value as a string. ${const:foo|'12'} => "foo": "12"

source.yml

foo: '${const:foobar|\'hello\'}'
bar: '${const:foobar|"world"}'
foobar: '${env:foobar|"some \"string\""}'
barfoo: '${const:foobar|1337}'
barfoobar: '${config:foobar|"1024"}'

loaded configuration (json)

{
	"foo": "hello",
	"bar": "world",
	"foobar": "some \"string\"",
	"barfoo": 1337,
	"barfoobar": "1024"
}

---

Configuration imports

Yaml-config-loader provides an importing system
You simply need to add an import statement and add some files to import
each files are described by two properties

• source: String. file path
• if: (Optional) Object. conditions { 'field (dynamic of not)' : 'value to check' }
  you can use all syntaxes above presented except the ${local:...}

imports:
    - { source: 'dev/config.yml', if: { '${env:envname}': 'dev' } }

Usage:

imports:
    - { source: 'dev/config.yml', if: { '${env:envname}': 'dev' } }

foo: 'bar'

All syntaxes of js-yaml are available

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Modify and build

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npm install

Build command: grunt es6 It will create js files from the es6 sources.

Unit tests: grunt unit

###Credits

This library is based on the awesome js-yaml parser.