Config Extends

Allow to extend json or yaml/json files configuration

Features

• Multiple extension
• Can be loaded from yaml or json files
• Can load from a directory including all its files
• Available from browser and node.js
• CLI

Methods

.extends(source,...args) [synchronously]

This api allows to extend one or more json objects

• Params:
  • source : object with extensions defined
  • args : others sources

.apply(source,target) [asynchronous]

This api allows to extend configuration from a file or several files from a path

• Params:
  • source : path of file or folder
  • target : file result (optional)

Note: Only node.js

Installation

module for node.js

npm install config-extends

CLI executable

If you want to extends from CLI, install config-extends globally:

npm install -g config-extends

Usage

From library for node.js

const ConfigExtends = require("config-extends")

let source ={
    data : {_extends:'base',d:3,e:4},
    base: {a:1,b:2}
};
let config = ConfigExtends.extends(source);
console.log(JSON.stringify(config,null,2));

From library for browsers

<script src="config-extends.min.js"></script>

let source ={
    data : {_extends:'base',d:3,e:4},
    base: {a:1,b:2}
};
let config = ConfigExtends.extends(source);
console.log(JSON.stringify(config,null,2));

From CLI

extends

usage: config-extends extends -s

arguments:
  -s, --source   Input json (serialized).

apply

usage: config-extends apply -s [-t]

arguments:
  -s, --source   Input path of folder or file.
  -t, --target   output file (optional).

Examples

Simple extension

let source ={
    data : {_extends:'base',d:3,e:4},
    base: {a:1,b:2}
};
let config = ConfigExtends.extends(source);
console.log(JSON.stringify(config,null,2));

result:

{
  "data": {"d": 3,"e": 4,"a": 1,"b": 2 },
  "base": {"a": 1,"b": 2}
}

Chain extension

let source ={
    data: { 1: {_extends:'base',d:3,e:4},
           2: {_extends:'data.1', f:3,g:4},
           },
    base: {a:1,b:2}
}
let config = ConfigExtends.extends(source);
console.log(JSON.stringify(config,null,2));

result:

{
  "data": { 
    "1":{"d": 3,"e": 4,"a": 1,"b": 2 },
    "2":{"f": 3,"g": 4,"d": 3,"e": 4,"a": 1,"b": 2}
  },
  "base": {"a": 1,"b": 2}
}

Multiple extension

let source ={
    data: { 1: {_extends:'base',d:3,e:4},
            2: {_extends:['base','base2'], f:3,g:4},
            },
    base: {a:1,b:2},
    base2: {h:'a',i:'b'}
};
let config = ConfigExtends.extends(source);
console.log(JSON.stringify(config,null,2));

result:

{
  "data": {
    "1": {"d": 3,"e": 4,"a": 1,"b": 2},
    "2": {"f": 3,"g": 4,"a": 1,"b": 2,"h": "a","i": "b"}
  },
  "base": {"a": 1,"b": 2 },
  "base2": {"h": "a","i": "b"}
}

apply from path

let config = await ConfigExtends.apply(path.join(__dirname,'test-1'));
console.log(JSON.stringify(config,null,2));

structure folder

• test-1
  • folder1
    • file1.yaml content => c: 3
  • folder2
    • file1.yaml content => _extends: [file,folder1.file1] d: 1
    • file2.yaml content => _extends: folder2.file1 e: 1
  • file.yaml content => a: 1 b: "b"

result

{
  "file": { "a": 1, "b": "b" },
  "folder1": { "file1": { "c": 3 } },
  "folder2": {
    "file1": { "d": 1, "a": 1, "b": "b", "c": 3 },
    "file2": { "e": 1, "d": 1, "a": 1, "b": "b", "c": 3 }
  }
}

apply from path CLI

config-extends apply -s ./test/test-1

result:

{
  "file": { "a": 1, "b": "b" },
  "folder1": { "file1": { "c": 3 } },
  "folder2": {
    "file1": { "d": 1, "a": 1, "b": "b", "c": 3 },
    "file2": { "e": 1, "d": 1, "a": 1, "b": "b", "c": 3 }
  }
}

apply from single file

let config = await configExtends.apply(path.join(__dirname,'raspberry.yaml'));
console.log(JSON.stringify(config.version,null,2));

raspberry.yaml

version:
  PiA:
    _extends: [family.Pi, model.A]
  PiB:
    _extends: [family.Pi, model.B]
  PiA+:
    _extends: [family.Pi, model.A]
    measure: 
      _extends: measure.compact
  PiB+:
    _extends: [family.Pi, model.B]
  Pi2B:
    measure: 
      _extends: measure.standard
  Pi3A:
    _extends: [family.Pi3, model.A]
  Pi3A+:
    _extends: [family.Pi3, model.A]
  Pi3B+:
    _extends: [family.Pi3, model.B]
  Pi4B1G:
    _extends: family.Pi4
    memory: 1G
  Pi4B2G:
    _extends: family.Pi4
    memory: 2G
  Pi4B4G:
    _extends: family.Pi4
    memory: 4G
  Pi4B8G:
    _extends: family.Pi4
    memory: 8G
family:
  Pi:
    wireless: false
    measure: 
      _extends: measure.standard
  Pi3:
    wireless: true
    measure: 
      _extends: measure.standard    
  Pi4:
    _extends: [model.B]
    wireless: true
    measure: 
      _extends: measure.standard
model:
  A:
    ethernet: false
  B:
    ethernet: true    
measure:
  standard:
    high: 85.6
    long: 56.5
  compact:
    high: 65
    long: 56.5  

result:

{
    "PiA":  {"wireless": false,"measure": {"high": 85.6,"long": 56.5 },"ethernet": false},
    "PiB":  {"wireless": false,"measure": {"high": 85.6,"long": 56.5 },"ethernet": true },
    "PiA+": {"measure": {"high": 85.6,"long": 56.5},"wireless": false,"ethernet": false },
    "PiB+": {"wireless": false,"measure": {"high": 85.6,"long": 56.5},"ethernet": true },
    "Pi2B": {"measure": {"high": 85.6,"long": 56.5}},
    "Pi3A": {"wireless": true,"measure": {"high": 85.6,"long": 56.5},"ethernet": false },
    "Pi3A+":{"wireless": true,"measure": {"high": 85.6,"long": 56.5},"ethernet": false },
    "Pi3B+":{"wireless": true,"measure": {"high": 85.6,"long": 56.5},"ethernet": true },
    "Pi4B1G":{"memory": "1G","wireless": true,"measure": {"high": 85.6,"long": 56.5},"ethernet": true},
    "Pi4B2G":{"memory": "2G","wireless": true,"measure": {"high": 85.6,"long": 56.5},"ethernet": true},
    "Pi4B4G":{"memory": "4G","wireless": true,"measure": {"high": 85.6,"long": 56.5 },"ethernet": true},
    "Pi4B8G": {"memory": "8G","wireless": true,"measure": {"high": 85.6,"long": 56.5 },"ethernet": true}
}

Test

npm run test