javascript - How to Increment Version Number via Gulp Task?

Question

I would like to replace a string indicating version number in a javascript file (myConstantsFile.js), with another string. So, for example, my version number looks like this: "01.11.15", written like this in myConstantsFile.js with other constants:

.constant('productVersion', '1.11.15'); 

Right now, my task looks like this:

gulp.task('increment-version', function(){
    gulp.src(['./somedir/myConstantsFile.js'])
        .pipe(replace(/'productVersion', '(.*)'/g, '99.99.99'))
        .pipe(gulp.dest('./somedir/'));
});

As you can see, I am using a constant, not running incrementation code, which would look like this:

    var numberString = '0.0.1';
    var versionParts = numberString.split('.');
    var vArray = {
      vMajor : versionParts[0],
      vMinor : versionParts[1],
      vPatch : versionParts[2]
    } 

    vArray.vPatch = parseFloat(vArray.vPatch) + 1;
    var periodString = ".";

    var newVersionNumberString = vArray.vMajor + periodString + 
                                vArray.vMinor+ periodString + 
                                vArray.vPatch; 

I need:

1. A way to select the current version number via regex via the file.
2. To know where I can put the logic in the last code block to increment the number and build the new string.

Answer 1

Install gulp-bump

npm install gulp-bump --save-dev

Install yargs

npm install yargs --save-dev

Require gulp-bump

var bump = require('gulp-bump');

Require yargs

var args = require('yargs').argv;

Your bump task

gulp.task('bump', function () {
    /// <summary>
    /// It bumps revisions
    /// Usage:
    /// 1. gulp bump : bumps the package.json and bower.json to the next minor revision.
    ///   i.e. from 0.1.1 to 0.1.2
    /// 2. gulp bump --version 1.1.1 : bumps/sets the package.json and bower.json to the 
    ///    specified revision.
    /// 3. gulp bump --type major       : bumps 1.0.0 
    ///    gulp bump --type minor       : bumps 0.1.0
    ///    gulp bump --type patch       : bumps 0.0.2
    ///    gulp bump --type prerelease  : bumps 0.0.1-2
    /// </summary>

    var type = args.type;
    var version = args.version;
    var options = {};
    if (version) {
        options.version = version;
        msg += ' to ' + version;
    } else {
        options.type = type;
        msg += ' for a ' + type;
    }


    return gulp
        .src(['Path to your package.json', 'path to your bower.json'])
        .pipe(bump(options))
        .pipe(gulp.dest('path to your root directory'));
});

---

VSO Note: I believe a lot of people coming to this thread will be looking exactly for the answer above. The code below is to edit a version number stored somewhere BESIDES the npm/bower package files, such as in angular constants:

gulp.task('increment-version', function(){
    //docString is the file from which you will get your constant string
    var docString = fs.readFileSync('./someFolder/constants.js', 'utf8');

    //The code below gets your semantic v# from docString
    var versionNumPattern=/'someTextPreceedingVNumber', '(.*)'/; //This is just a regEx with a capture group for version number
    var vNumRexEx = new RegExp(versionNumPattern);
    var oldVersionNumber = (vNumRexEx.exec(docString))[1]; //This gets the captured group

    //...Split the version number string into elements so you can bump the one you want
    var versionParts = oldVersionNumber.split('.');
    var vArray = {
        vMajor : versionParts[0],
        vMinor : versionParts[1],
        vPatch : versionParts[2]
    };

    vArray.vPatch = parseFloat(vArray.vPatch) + 1;
    var periodString = ".";

    var newVersionNumber = vArray.vMajor + periodString +
                           vArray.vMinor+ periodString +
                           vArray.vPatch;

    gulp.src(['./someFolder/constants.js'])
        .pipe(replace(/'someTextPreceedingVNumber', '(.*)'/g, newVersionNumber))
        .pipe(gulp.dest('./someFolder/'));
});

I ommitted some mumbo-jumbo that writes my constant in a pretty string, but that's the gist and it works.