@use/core

Add use() function for easy plugin ability.

Allows default options and plugin specific options.

Accepts module name or path to use() and will require() it for you.

Can assign it to any name.

Table of Contents

• Install
• Applying use
• Example Plugin
• Example
• Specify Default Options
• Specify Plugin Options
• Enhance Itself
• Generate Your Own to Enhance
• Custom Generation

Install

npm install use --save

Usage: Applying 'use'

The simplest way to use this module is to require() it and assign it to the use property on your object.

You may use any property name, like, 'load', 'add', 'plugin', or 'enhance'.

Use it by supplying something which can be given to require() to get a function, or, supply a function.

// your thing can be anything we can set `use` on
var thing = getThing()
// get this module which is the `use()` function
  , use = require('@use/core')

// set it on your thing. can name it anything you want.
thing.use = use

var somePluginName = 'some-name'
  , pluginRequired = require('another-plugin')
  , pluginFunction = function() { }
  , someOptions = {}

// add those plugins to your `thing`:
//  Note: options are optional

// 1. provide a module name or file path for `require()`
thing.use(somePluginName, someOptions)

// 2. provide the module directly when you've already loaded it
thing.use(pluginRequired, { /* Or, some other options */ })

// 3. provide a function directly as a plugin
thing.use(pluginFunction /* Or, no options */)

Usage: Example Plugin

function plugin(options, thing) {
  // `this` is the `thing`, same as param #2.
  // so, these two lines do the same thing:
  this.blah = 'example'
  thing.blah = 'example'

  // `options` is the combined options provided to:
  //   1. `use.gen(baseOptions)`
  //   2. `thing.use = use.withOptions(defaultOptions)`
  //   3. `thing.use(fn, pluginOptions)`
  // #3 overrides #2, #2 overrides #1.
  // options may be null
}

Usage: Example

// example `thing` is a behaviorless object
var thing = {}

// add this module so plugins can be applied
thing.use = require('@use/core')

// add a function directly as a plugin.
// it adds a function to the `thing`
thing.use(function addProcess() {
  // `this` is the `thing`
  this.process = function process(string) {
    console.log('I am processing string:', string)
  }
})

// now `thing` has added ability.
// the below call will output to the console:
//   I am processing string: blah
thing.process('blah')

// add another function which will alter process()
thing.use(function wrapInput(options) {
  var realProcess = this.process
    , prefix = '['
    , suffix = ']'

  if (options) {
    if (options.prefix) prefix = options.prefix
    if (options.suffix) suffix = options.suffix
  }

  this.process = function wrappedProcess(string) {
    string = prefix + string + suffix
    return realProcess.call(this, string)
  }
})

// now `process()` wraps the string with brackets instead
// the below call will output to the console:
//   I am processing string: [bleh]
thing.process('bleh')

Usage: Specify Default Options

// as above, let's use a behaviorless object
var use = require('@use/core')
  , thing = {}

// instead of adding the default `use()` function, let's supply options.
thing.use = use.withOptions({
  // these will be used by `wrapInput`
  prefix: '(',
  suffix: ')'
})

// same as the functions made above
thing.use(addProcess)
thing.use(wrapInput)

thing.process('blarg')
// The `wrapInput` will receive the options we made
// and then use parenthesis instead of brackets.
// the above outputs this to the console:
//    I am processing string: (blarg)

Usage: Specify Plugin Options

// as above, let's use a behaviorless object
var use = require('@use/core')
  , thing = {}

// instead of adding the default `use()` function, let's supply options.
thing.use = use.withOptions({
  // these will be overridden by plugin specific options
  prefix: '(',
  suffix: ')'
})

// same as the functions made above
thing.use(addProcess)
// these plugin specific options will override default options
thing.use(wrapInput, {
  prefix: '\'',
  suffix: '\''
})

thing.process('bling')
// The `wrapInput` will receive options combined from the default
// options provided for the `use()` function
// and the plugin specific options provided to the `use()` call,
// So, it will use single quotes instead of brackets or parenthesis.
// the above outputs this to the console:
//    I am processing string: 'bling'

Usage: Enhance Itself

It's possible to use plugins to enhance the use instance itself.

var use = require('@use/core')

use.use(function (options, scope) {
  // `this` == scope

  // the second arg is normally the `thing` the `use()` function is on,
  // in this case, it is the object holding the internal functions.

  // the `scope` is an object containing the four functions used by `use`.
  // you may swap them out, set props onto the scope which can be used by them
  // whatever...

  // for example, to change the options combining to create a new object
  // via underscore library's extend() function:
  scope.combine = function(defaults, options) {
    return _.extend({}, options, defaults)
  }
  // changing `withOptions` and `use` is more complicated,
  // so look at the source to see the original implementations.
})

Usage: Generate Your Own to Enhance

All of the above examples use the default use instance. So, if you use the enhance it then everyone using the default instance will have those customizations.

To avoid that you can generate your own instance:

var use = require('@use/core')

// make your own to customize
use = use.gen()

Usage: Custom Generation

It's possible to supply an object to the gen() function to add properties to the internal scope or override the default internal functions.

The object you provide is used as the scope and if new functions aren't specified then the default ones are placed into it.

var use = require('@use/core')
  , customScope = {
    // make a property available in the `scope` for internal functions
    some: 'value',
    // override the `combine` function
    combine: function (defaultOptions, options) {
      return _.extend({}, options, defaults)
    }
  }

use = use.gen(customScope)

// also, you can specify some "base options" which are available to all plugins,
// and, are below the "default options" of withOptions()
use = use.gen({}, {
  some: 'base options'
})

// these options would override "base options"
use = use.withOptions({ some: 'default options'})

thing = { use:use }

// these options would override both the "base options" and "default options"
thing.use('some plugin', { some: 'plugin options'})

MIT License