Gulp doesn’t offer any kind of util for that, but you can use one of the many command args parsers. I like yargs
. Should be:
var argv = require('yargs').argv;
gulp.task('my-task', function() {
return gulp.src(argv.a == 1 ? options.SCSS_SOURCE : options.OTHER_SOURCE)
.pipe(sass({style:'nested'}))
.pipe(autoprefixer('last 10 version'))
.pipe(concat('style.css'))
.pipe(gulp.dest(options.SCSS_DEST));
});
You can also combine it with gulp-if
to conditionally pipe the stream, very useful for dev vs. prod building:
var argv = require('yargs').argv,
gulpif = require('gulp-if'),
rename = require('gulp-rename'),
uglify = require('gulp-uglify');
gulp.task('my-js-task', function() {
gulp.src('src/**/*.js')
.pipe(concat('out.js'))
.pipe(gulpif(argv.production, uglify()))
.pipe(gulpif(argv.production, rename({suffix: '.min'})))
.pipe(gulp.dest('dist/'));
});
And call with gulp my-js-task
or gulp my-js-task --production
.