Cordova Hook to change version code before building.

increment_build_number.js

#!/usr/bin/env node

// It changes version code before making build.
// You can see this link, on how I signed my apk using hooks. (https://gist.github.com/yawarsohail/1b2998d5cd860e01193cec86f6329223)
// Added below lines in script part of package.json to make build easy. (I think its prety easy, no need for description).
//    "release": "TARGET=ii ionic build ios --device --release && TARGET=aa ionic build --release android",
//    "release-a": "TARGET=a ionic build --release android",
//    "release-i": "TARGET=i ionic build ios --device --release"
//
// Save hook under `project-root/scripts`
//
// Don't forget to install xml2js using npm if it is not already installed.
// `$ npm install xml2js`
//
// Then add below line in config.xml inside widget.
// <hook src="scripts/increment_build_number.js" type="before_build"/>
//
// Rest I'll be describing in code comments. I'll be changing my project name with imaginary name and might miss in some part.
//
// I am adding this for my self so that I can remember. And it may help others who wants to do same.
//

var fs = require('fs');
var xml2js = require('xml2js');

// Read config.xml
fs.readFile('config.xml', 'utf8', function(err, data) {
  if(err) {
    return console.log(err);
  }
  
  // Get XML
  var xml = data;
  
  // Parse XML to JS Obj
  xml2js.parseString(xml, function (err, result) {
    if(err) {
      return console.log(err);
    }
    var target = "";
    if (process.env.TARGET) {
        // Log the value to the console
        console.log('process.env.TARGET is set to: ' + process.env.TARGET);
        target = process.env.TARGET;
    
        // Get JS Obj
        var obj = result;
        
        // ios-CFBundleVersion doen't exist in config.xml
        if(typeof obj['widget']['$']['version'] === 'undefined') {
          obj['widget']['$']['version'] = "0.0.1";
        }
        
        
        // Increment build numbers (separately for iOS and Android)

        var fullVer = obj['widget']['$']['version'];
        var Arr = fullVer.split('.');
        var i1 = Arr[0];
        var i2 = Arr[1];
        var i3 = Arr[2];
        i3++;
        // below conditions are to set limits that a version code part can go.
        if (i3 == 21) {
          i3 = '0';
          i2++;
          if(i2 == 10) {
            i2='0';
            i1++;
          }
        }
        if(target == "aa") {
          // don't inc as ios build have already incremented.
        }
        else {
          obj['widget']['$']['version'] = i1+'.'+i2+'.'+i3;
        }

        
        var builder = new xml2js.Builder();
        var xml = builder.buildObject(obj);
        
        // Write config.xml
        fs.writeFile('config.xml', xml, function(err) {
          if(err) {
            return console.log(err);
          }
          
          console.log('Build number successfully incremented');
        });
    }
  });
});