var cache = require("continuable-cache")
var fs = require("fs")

var readFile = function (uri) { return function (cb) {
    fs.readFile(uri, cb)
} }

var continuableFile = readFile("./package.json")

var cached = cache(continuableFile)

// will only do one file read operation
cached(function (err, file) {
    /* calls out to fs.readFile */
})

cached(function (err, file) {
    /* get's either err or file from cache in cached */
})