return through.obj(function (file, enc, cb) {
var ext = path.extname(file.path).slice(1).toLowerCase();
if (file.isNull() || ['png', 'jpg', 'jpeg', 'tif', 'tiff', 'webp'].indexOf(ext) === -1) {
cb(null, file);
return;
}
if (file.isStream()) {
cb(new gutil.PluginError('gulp-webp', 'Streaming not supported'));
return;
}
exec
.use(webp, args.concat([exec.src(), '-o', exec.dest()]))
.run(file.contents, function (err, buf) {
if (err) {
cb(new gutil.PluginError('gulp-webp', err, {fileName: file.path}));
return;
}
file.contents = buf;
if(options.append) {
file.path = file.path + '.webp';
}
else{
file.path = gutil.replaceExtension(file.path, '.webp');
}
cb(null, file);
});
});
return through.ctor({objectMode: true}, function (file, enc, cb) {
if (file.isNull()) {
cb(null, file);
return;
}
if (file.isStream()) {
cb(new Error('Streaming is not supported'));
return;
}
if (!isPng(file.contents)) {
cb(null, file);
return;
}
var execBuffer = new ExecBuffer();
var args = ['-brute', '-force', '-q'];
if (opts.reduce) {
args.push('-reduce');
}
execBuffer
.use(pngcrush, args.concat([execBuffer.src(), execBuffer.dest()]))
.run(file.contents, function (err, buf) {
if (err) {
err.fileName = file.path;
cb(err);
return;
}
if (buf.length < file.contents.length) {
file.contents = buf;
}
cb(null, file);
});
});