gulp-css-url-adjuster

This package allows gulp to change css urls

css file:

.cool-background {
    background-image: url('coolImage.jpg');
}

var urlAdjuster = require('gulp-css-url-adjuster');

gulp.src('style.css').
  pipe(urlAdjuster({
    prepend: '/image_directory/',
    append: '?version=1'
  }))
  .pipe(gulp.dest('modifiedStyle.css'));


.cool-background {
    background-image: url('/image_directory/coolImage.jpg?version=1');
}

only adjust relative paths:

.cool-background {
    background-image: url('coolImage.jpg');
}

.neato-background {
    background-image: url('/images/neatoImage.jpg');
}

gulp.src('style.css').
  pipe(urlAdjuster({
    prependRelative: '/image_directory/',
  }))
  .pipe(gulp.dest('modifiedStyle.css'));


.cool-background {
    background-image: url('/image_directory/coolImage.jpg');
}

.neato-background {
    background-image: url('/images/neatoImage.jpg');
}