exec-fallback

Tool to fallback to an exec command in case that a method doesn't return a satisfactory value

Usage

Install with ...

$ npm install exec-fallback --save

and create a fallback in case a synchronous template is empty:

var fb = require('exec-fallback')
var myFallback = fb(function () {
    // do something
}, 'fallback-command')

Here is a example where pwd is called in case a config.path property doesn't exist.

var fb = require('exec-fallback')
function regularCall() {
    return config.path
}
var myConfigPath = fb(regularCall, 'pwd')

since the fallback is an async exec command you need to register a callback hook to get the value

myConfigPath(function (error, value) {
  // there will never be an error,
})

Caching & Invalidation

The result will be cached by default for 10 minutes. You can change the cache time by passing in a third parameter.

var myConfigPath = fb(regularCall, 'pwd', 100000)

It is also possible to invalidate the currently cached value.

myConfigPath.invalidate()

License

ISC

Originally inspired by osenv.