62 lines
3.4 KiB
Markdown
62 lines
3.4 KiB
Markdown
# gulp-function
|
|
accepts call to execute in gulp pipeline.
|
|
|
|
## Availabililty
|
|
[](https://www.npmjs.com/package/gulp-function)
|
|
[](https://gitlab.com/pushrocks/gulp-function)
|
|
[](https://github.com/pushrocks/gulp-function)
|
|
[](https://pushrocks.gitlab.io/gulp-function/)
|
|
|
|
## Status for master
|
|
[](https://gitlab.com/pushrocks/gulp-function/commits/master)
|
|
[](https://gitlab.com/pushrocks/gulp-function/commits/master)
|
|
[](https://david-dm.org/pushrocks/gulp-function)
|
|
[](https://www.bithound.io/github/pushrocks/gulp-function/master/dependencies/npm)
|
|
[](https://www.bithound.io/github/pushrocks/gulp-function)
|
|
[](https://nodejs.org/dist/latest-v6.x/docs/api/)
|
|
[](https://nodejs.org/dist/latest-v6.x/docs/api/)
|
|
[](http://standardjs.com/)
|
|
|
|
### Usage
|
|
```javascript
|
|
import * as gulp from 'gulp';
|
|
import gulpFunction from 'gulp-function' // default ES6 export
|
|
// import {forFirst, forEach, atEnd} from 'gulp-function'
|
|
let Q = require("q");
|
|
|
|
let myFunction = function (file, enc) { // file and enc are optional in case you want to modify the file object
|
|
let done = Q.defer();
|
|
console.log("Hello World!")
|
|
|
|
// NOTE:
|
|
// you can use done.resolve as callback function
|
|
// of any async tasks within this function
|
|
done.resolve();
|
|
|
|
return done.promise;
|
|
}
|
|
|
|
gulp.task('gulpTest',function() {
|
|
let stream = gulp.src('./mydir/*.something')
|
|
.pipe(gulpFunction(myFunction,'forEach')) //read the notes below
|
|
// .pipe(forEach(myFunction)) // if imported as >> import { forEach } from 'gulp-function' <<
|
|
.pipe(gulp.dest("./build/"));
|
|
return stream; // by returning the stream gulp knows when our task has finished.
|
|
});
|
|
```
|
|
|
|
### Notes:
|
|
|
|
* The first argument of gulpFunction can also be an **array of multiple functionnames**.
|
|
Each function can return a promise. The pipe stop will finish when every promise is fullfilled.
|
|
When providing an array of functions be careful with modifying the file object -> race condition
|
|
* The second argument can be empty, it defaults to "forEach"
|
|
* The following options are available:
|
|
* "forFirst" - executes when first chunk/vinylfile of the stream reaches the pipestop.
|
|
file is pushed further down the line when function's returned promise is fullfilled.
|
|
* "forEach" - executes like "forFirst" but with every chunk/vinylfile in the stream;
|
|
* "atEnd" - executes after all chunks have passed and are processed in full.
|
|
That means the stream's "finish" event fires **before "atLast" is executed**!!!
|
|
|
|
[](https://push.rocks)
|