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How to combine tasks in gulpjs?

  • Gulp configuration file consists of task modules.
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  • The Gulp task will have following structure 
gulp.task('name-of-task', function() {
   //write your task actions
});
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  • In order to register a task in gulp file we want to call gulp.task function which accepts two parameters.
  • First parameter name-of-task is considered as task name and second parameter is anonymous function block which defines the task actions.
function() {
   //write your task actions
}
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  • gulp.task will register function as task within the name. This name is used to specify the dependency on other gulp tasks.

Being able to tell us that it is running is a fine task, but lets get gulp to do some real tasks for us.

  • We'll start with simple tasks and work our way up.
  • Task enables a modular approach to configure Gulp.
  • We need to create task for each dependency, which we would add up as we find and install other plugins.
  • The Gulp task will have following structure
gulp.task('task-name', function() {
   	//do stuff here		
	});
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  • Where “task-name” is a string name and “function()” performs your task.
  • The “gulp.task” registers the function as a task within the name and specifies the dependencies on other tasks.

Installing Plugins

  • Let us take one plugin called minify-css to merge and minify all CSS scripts. It can be installed by using npm as given in the following command
npm install gulp-minify-css --save-dev
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  • To work with “gulp-minify-css plugin”, you should install another plugin called “gulp-autoprefixer” as given in the following command
npm install gulp-autoprefixer --save-dev
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  • To concatenate the CSS files, install the gulp-concat as given in the following command
npm install gulp-concat --save-dev
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  • After installation of plugins, you should write dependencies in your configuration file as follows
var autoprefix = require('gulp-autoprefixer');
var minifyCSS = require('gulp-minify-css');
var concat = require('gulp-concat');
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Adding Task to Gulp file

  • We need to create task for each dependency, which we would add up as we install the plugins.
  • The Gulp task will have following structure
gulp.task('styles', function() {
   	gulp.src(['src/styles/*.css'])
   	.pipe(concat('styles.css'))
  	 .pipe(autoprefix('last 2 versions'))
   	.pipe(minifyCSS())
  	 .pipe(gulp.dest('build/styles/'));
	});
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  • The ‘concat’ plugin concatenates the CSS files and ‘autoprefix’ plugin indicates the current and the previous versions of all browsers.
  • It minifies all CSS scripts from src folder and copies to the build folder by calling ‘dest’ method with an argument, which represents the target directory.
  • To run the task, use the following command in your project directory 
gulp styles
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  • Also, we will use another plugin called ‘gulp-imagemin’ to compress the image file, which can be installed using the following command 
npm install gulp-imagemin --save-dev
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  • You can add dependencies to your configuration file using the following command 
var imagemin = require ('gulp-imagemin');
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  • You can create the task for above defined dependency as shown in the following code.
gulp.task ('imagemin', function() {
Var img_src = 'src/images/**/*', img_dest = 'build/images';
gulp. Src(img_src)
.pipe(changed(img_dest))
.pipe(imagemin())
.pipe(gulp.dest(img_dest));
});
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  • The images are located in “src/images/**/*” which are saved in the img_srcobject. It is piped to other functions created by the ‘imagemin’ constructor.
  • It compresses the images from src folder and copies to the build folder by calling ‘dest’ method with an argument, which represents the target directory.
  • To run the task, use the following command in your project directory 
Gulp imagemin
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Combining Multiple Tasks

  • You can run multiple tasks at a time by creating default task in the configuration file.
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Code 

gulp.task ('default', ['imagemin', 'styles'], function() {
});
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  • Gulp file is set up and ready to execute. Run the following command in your project directory to run the above combined tasks 
Gulp
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Output

  • On running the task using the above command, you will get the following result in the command prompt
C:\work>gulp
[16:08:51] Using gulpfile C:\work\gulpfile.js
[16:08:51] Starting 'imagemin'...
[16:08:51] Finished 'imagemin' after 20 ms
[16:08:51] Starting 'styles'...
[16:08:51] Finished 'styles' after 13 ms
[16:08:51] Starting 'default'...
[16:08:51] Finished 'default' after 6.13 ms
[16:08:51] gulp-imagemin: Minified 0 images

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gulp - Using run-sequence :

  • Run a series of dependent gulp tasks in order
  • Plugins located in the following path https://github.com/OverZealous/run-sequence
    • var runs = require('run-sequence‘);
gulp.task('release', function(cb) {
return runs(‘clean’, ['build', 'rjs'], cb);
});
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