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index.js
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index.js
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'use strict';
var path = require('path');
var fs = require('graceful-fs');
var gutil = require('gulp-util');
var map = require('map-stream-limit');
var filesize = require('filesize');
var tempWrite = require('temp-write');
var imagemin = require('image-min');
module.exports = function(options) {
return map(function(file, cb) {
if (file.isNull()) {
return cb(null, file);
}
if (file.isStream()) {
return cb(new gutil.PluginError('gulp-image-optimization', 'Streaming not supported'));
}
if (['.jpg', '.JPG', '.JPEG', '.jpeg', '.png', '.PNG', '.gif', '.GIF'].indexOf(path.extname(file.path)) === -1) {
gutil.log('gulp-image-optimization: Skipping unsupported image ' + gutil.colors.blue(file.relative));
return cb(null, file);
}
tempWrite(file.contents, path.extname(file.path), function(err, tempFile) {
if (err) {
return cb(new gutil.PluginError('gulp-image-optimization', err));
}
// workaround: https://github.com/kevva/image-min/issues/8
fs.stat(tempFile, function(err, stats) {
if (err) {
return cb(new gutil.PluginError('gulp-image-optimization', err));
}
var origSize = stats.size;
imagemin(tempFile, tempFile, options, function() {
fs.readFile(tempFile, function(err, data) {
if (err) {
return cb(new gutil.PluginError('gulp-image-optimization', err));
}
var saved = origSize - data.length;
var savedMsg = saved > 0 ? 'saved ' + filesize(saved, {
round: 1
}) : 'already optimized';
gutil.log('gulp-image-optimization:', gutil.colors.green('✔ ') + file.relative + gutil.colors.gray(' (' + savedMsg + ')'));
file.contents = data;
cb(null, file);
});
});
});
});
}, 10);
};