Run gulp from child directories? - gulp

Question

I currently have a file structure like this
SASS
gulpfile.js
node_modules
sites
example-site
scss
css
example-site-two
scss
css
example-site-three
scss
css
I have gulp installed in the main parent SASS folder with a task 'sass-all' that can go through every single sites scss folder and compile it into css.
I'm trying to write a new task called 'sass-single' which can be run from any of the example-site folders. So let's say I'm in the folder "example-site-two", I want to be able to cmd and do 'gulp sass-single' and ONLY have it compile the SASS in this site. Same thing for a watch-single task I'd like to setup.
Problem is whenever I run this task from a site folder, it changes my working directory up to the parent SASS folder. I don't want to have 100 different tasks for every different site, I'd prefer to just have one 'sass-single' task thats smart enough to only compile the files from the folder I was in when I ran the script.
current Gulp task attempt
gulp.task('sass-single', function () {
process.chdir('./');
// Where are the SCSS files?
var input = './scss/*.scss';
// Where do you want to save the compiles CSS file?
var output = './css';
return gulp
.src(input)
.pipe(sourcemaps.init())
.pipe(sass(sassOptions).on('error', sass.logError))
.pipe(postcss(processors))
.pipe(sourcemaps.write('./maps'))
.pipe(gulp.dest(output));
});
However this goes back to the main SASS folder and then just does nothing.
How would I go about modifying this to be able to run from any site folder and have it only do it for that site?

Answer 1

If you want to change the current working directory (CWD) back to the directory where you invoked gulp then this won't work:
process.chdir('./');
That's a relative path. Relative paths are relative to the CWD. But by the time you execute process.chdir('./') Gulp has already changed the CWD to the directory where your Gulpfile.js is located. So you're just changing the CWD to ... the CWD.
You could explicitly pass a CWD to gulp on the command line:
SASS/sites/example-site> gulp --cwd .
But that would get annoying pretty quickly.
Luckily for you Gulp stores the original CWD in process.env.INIT_CWD before changing it. So you can use the following in your task to change the CWD back to the original:
process.chdir(process.env.INIT_CWD);