Examples

01NormalContinuationStyle.js

var path = require('path')
var fs = require('fs')

// FS EXAMPLE - concat all js files in dir and save to destFile
// This is normal node.js code
function concatJsFiles(dir, destFile, cb) {
    fs.readdir(dir, function(err, files) {
        if (err) return cb(err)

        // Filter *.js files
        files = files.filter(function (name) {
            return (name.slice(-3) === '.js');
        });

        // Read all the files (in a parallel loop)
        var fileContents = []
        function getContentsOfAllFiles(cb) {
            files.forEach(function(file) {
                var fullPath = path.join(dir, file)
                fs.readFile(fullPath, 'utf-8', function(err, contents) {
                    if (err) return cb(err)
                    fileContents.push(contents)
                    if (fileContents.length == files.length)
                        cb(null, fileContents)
                })
            })
        }

        getContentsOfAllFiles(function(err, contents) {
            if (err) return cb(err)

            // Join them all together
            var combined = contents.join("\n")

            // Save them
            fs.writeFile(destFile, combined, 0775, function(err) {
                 cb(err, files) // so we know which files we included
            })
        })
    })
}

02WithFramework.js

var fromPromises = require('theframework')
var path = require('path')
var fs = require('fs')

// concatJsFiles = function(dir, destFile, cb)
var concatJsFiles = fromPromises(fs, path, function(fs, path, dir, destFile) {

    var files = fs.readdir(dir)

    // filter *.js files
    files = files.filter(function (name) {
        return (name.slice(-3) === '.js');
    });
     
    // same as "getContentsOfAllFiles" step above. 
    // Note that this contains an async operation
    var contents = files.map(function(file) {
        var fullPath = path.join(dir, file)
        return fs.readFile(fullPath, 'utf-8')
    })

    // combine into one file
    var combined = contents.join("\n")

    // write the file
    fs.writeFile(destFile, combined, 0775)

    // sends return value to 2nd param: cb(err, files)
    return files
})

03Chained.js

var fromPromises = require('theframework')
var path = require('path')
var fs = require('fs')

// You can chain things
var concatJsFiles = fromPromises(fs, path, function(fs, path, dir, destFile) {
    var combined = fs
        .readdir(dir)
        .filter(function (name) {
            return (name.slice(-3) === '.js');
        })
        .map(function(file) {
            var fullPath = path.join(dir, file)
            return fs.readFile(fullPath, 'utf-8')
        })
        .join("\n")

    fs.writeFile(destFile, combined, 0775)
})