gulp-svgfallback

Generate png sprite from svg sources.

1. Runs phantomjs only once for all svg sources
2. Doesn't create any temporary files
3. Allows to use custom CSS template

Options

• backgroundUrl — url of background image, is set to output png fileName by default;
• cssTemplate — path to custom CSS lodash template;
• spriteWidth — maximum width of the sprite, default: 400.

Automatic options:

• css class of each icon is set to the name of corresponding file;
• output png and css filenames are set to the name of base directory of the first file.

If your workflow is different, please use gulp-rename to rename sources or result files.

Usage

The following task will output icons.png and icons.css:

var svgfallback = require('gulp-svgfallback');
var gulp = require('gulp');

gulp.task('svgfallback', function () {
    return gulp
        .src('src/icons/*.svg', {base: 'src/icons'})
        .pipe(svgfallback())
        .pipe(gulp.dest('dest'));
});

Caveats

Please ensure that svg sources have width and height: these dimensions will be used to generate png sprite.

Custom css template

An additional option cssTemplate allows you to override template that is used to generate css. For more info, please check the default template in 'templates/style.css'.

Here is an example of data that is passed to css template:

{
    "backgroundUrl": "sprite.png",
    "icons": [
        {
            "name": "circle",
            "width": 40,
            "height": 40,
            "left": 0,
            "top": 0
        },
        {
            "name": "square",
            "width": 40,
            "height": 40,
            "left": 40,
            "top": 0
        }
    ]
}

Custom css classes

If you need to add prefix to each css class, please use gulp-rename:

var gulp = require('gulp');
var rename = require('gulp-rename');
var svgfallback = require('gulp-svgfallback');

gulp.task('default', function () {
    return gulp
        .src('src/icons/*.svg', {base: 'src/icons'})
        .pipe(rename({prefix: 'icon-'})
        .pipe(svgfallback())
        .pipe(gulp.dest('dest'));
});

Since css class for each icon should be unique, you cannot pass files with the same name. If you need to have nested directories that may have files with the same name, please use gulp-rename. The following example will concatenate relative path with the name of the file, e.g. src/icons/one/two/three/circle.svg becomes one-two-three-circle.

var gulp = require('gulp');
var rename = require('gulp-rename');
var svgfallback = require('gulp-svgfallback');

gulp.task('default', function () {
    return gulp
        .src('src/icons/**/*.svg', {base: 'src/icons'})
        .pipe(rename(function (path) {
            var name = path.dirname.split(path.sep);
            name.push(path.basename);
            path.basename = name.join('-');
        }))
        .pipe(svgfallback())
        .pipe(gulp.dest('dest'));
});

Add variations

To add variations (e.g. different colors) into your sprite, you can combine gulp-svgfallback with other gulp plugins.

The following task will add .circle-red and .circle-blue into your sprite.

var path = require('path');
var gulp = require('gulp');
var gulpif = require('gulp-if');
var lazypipe = require('lazypipe');
var clone = require('gulp-clone');
var cheerio = require('gulp-cheerio');
var rename = require('gulp-rename');
var svgfallback = require('gulp-svgfallback');

function isCircle (file) {
    return path.basename(file.relative) === 'circle.svg';
}

function colorize (color) {
    var sink;
    return (lazypipe()
        .pipe(function () {
            sink = clone.sink();
            return sink;
        })
        .pipe(cheerio, function ($) {
            $('svg').attr('fill', color);
        })
        .pipe(rename, {suffix: '-' + color})
        .pipe(function () {
            return sink.tap();
        })
    )();
}

gulp.task('svgfallback', function () {
    return gulp
        .src('src/icons/*.svg', {base: 'src/icons'})
        .pipe(gulpif(isCircle, colorize('red')))
        .pipe(gulpif(isCircle, colorize('blue')))
        .pipe(svgfallback())
        .pipe(gulp.dest('dest'));
});

Changelog

• 5.0.1 Update lodash dep #14
• 5.0.0 Remove gulp-util dep, drop node 0.12 support
• 4.0.1 Update to PhantomJS 2, drop node 0.10 support
• 3.0.2 Update direct dependencies
• 3.0.1 Reduced dev dependencies
• 2.0.0 Reduced amount of options, improved readme
• 1.0.1 Added example of how to add variations
• 1.0.0 Initial release