Cordova build hook, to use build version from config.xml in your hybrid app

020_build_version.js

#!/usr/bin/env node

// This plugin replaces text in a file with the app version from config.xml.

var wwwFileToReplace = "js/build.js";

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

var rootdir = process.argv[2];

function loadConfigXMLDoc(filePath) {
    var fs = require('fs');
    var xml2js = require('xml2js');
    var json = "";
    try {
        var fileData = fs.readFileSync(filePath, 'ascii');
        var parser = new xml2js.Parser();
        parser.parseString(fileData.substring(0, fileData.length), function (err, result) {
            //console.log("config.xml as JSON", JSON.stringify(result, null, 2));
            json = result;
        });
        console.log("File '" + filePath + "' was successfully read.");
        return json;
    } catch (ex) {
        console.log(ex)
    }
}

function replace_string_in_file(filename, to_replace, replace_with) {
    var data = fs.readFileSync(filename, 'utf8');

    var result = data.replace(new RegExp(to_replace, "g"), replace_with);
    fs.writeFileSync(filename, result, 'utf8');
}

var configXMLPath = "config.xml";
var rawJSON = loadConfigXMLDoc(configXMLPath);
var version = rawJSON.widget.$.version;
console.log("Version:", version);

var rootdir = process.argv[2];

var currentBuildPlatforms = process.env.CORDOVA_PLATFORMS.split(",");
console.log("Current build platforms: ", currentBuildPlatforms);

if (rootdir) {
    currentBuildPlatforms.forEach(function(val, index, array) {
        var wwwPath = "";
        switch(val) {
            case "ios":
                wwwPath = "platforms/ios/www/";
                break;
            case "android":
                wwwPath = "platforms/android/assets/www/";
                break;
            default:
                console.log("Unknown build platform: " + val);
        }
        var fullfilename = path.join(rootdir, wwwPath + wwwFileToReplace);
        if (fs.existsSync(fullfilename)) {
            replace_string_in_file(fullfilename, "%%VERSION%%", version);
            console.log("Replaced version in file: " + fullfilename);
        }
    });
}

appController.js

angular.module('equipmentShare').controller('AppController', function ($scope, BUILD) {
    $scope.appVersion = BUILD.VERSION;
});

build.js

/*
 * Cordova build hook will replace this version with the actual version from config.xml.
 */
angular.module('equipmentShare').constant('BUILD', {
    VERSION: "%%VERSION%%"
});

sidemenu.html

<!-- This example is from an Ionic app. Modify as needed for your framework/templating solution. -->
... other content ...
    <ion-item>
        Version {{appVersion}}
    </ion-item>
... other content ...

@DavidFrahm just FYI in new versions of cordova an error is triggered here

var currentBuildPlatforms = process.env.CORDOVA_PLATFORMS.split(',')

error:

var currentBuildPlatforms = process.env.CORDOVA_PLATFORMS.split(',')
                                                          ^

TypeError: Cannot read property 'split' of undefined

apparently process.env.CORDOVA_PLATFORMS does not exist anymore

Hi there, I made a new functional hook script stored at hooks/setVersion.js. I just tested it now and it works (just in Android, for iOS you just need to replicate the wwwDir)

#!/usr/bin/env node

// This plugin replaces text '%%VERSION%%' in a file with the app version from config.xml.

var wwwFileToReplace = 'js/main.js'

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

module.exports = function (context) {
  var projectRoot = context.opts.projectRoot
  const wwwDir = path.join(projectRoot, 'platforms', 'android', 'app', 'src', 'main', 'assets', 'www')

  var configXMLPath = 'config.xml'
  loadConfigXMLDoc(configXMLPath, (rawJSON) => {
    var version = rawJSON.widget.$.version
    console.log('Version:', version)

    var fullfilename = path.join(wwwDir, wwwFileToReplace)
    if (fs.existsSync(fullfilename)) {
      replaceStringInFile(fullfilename, '%%VERSION%%', version)
      console.log(context.hook + ': Replaced version in file: ' + path.relative(projectRoot, fullfilename))
    } else {
      console.error('File does not exist: ', path.relative(projectRoot, fullfilename))
      process.exit(1)
    }
  })
}

function loadConfigXMLDoc (filePath, callback) {
  var fs = require('fs')
  var xml2js = require('xml2js')
  try {
    var fileData = fs.readFileSync(filePath, 'ascii')
    var parser = new xml2js.Parser()
    parser.parseString(fileData.substring(0, fileData.length), function (err, result) {
      if (err) {
        console.error(err)
        process.exit(1)
      } else {
        // console.log("config.xml as JSON", JSON.stringify(result, null, 2))
        console.log("File '" + filePath + "' was successfully read.")
        callback(result)
      }
    })
  } catch (ex) {
    console.log(ex)
    process.exit(1)
  }
}

function replaceStringInFile (filename, toReplace, replaceWith) {
  var data = fs.readFileSync(filename, 'utf8')

  var result = data.replace(new RegExp(toReplace, 'g'), replaceWith)
  fs.writeFileSync(filename, result, 'utf8')
}

You have also to add in config.xml

  <hook src="hooks/setVersion.js" type="after_prepare"/>