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'use strict';
var File = require('vinyl');
var fs = require('fs');
var isGzip = require('is-gzip');
var objectAssign = require('object-assign');
var stripDirs = require('strip-dirs');
var tar = require('tar-stream');
var through = require('through2');
var zlib = require('zlib');
module.exports = function (opts) {
opts = opts || {};
opts.strip = +opts.strip || 0;
return through.obj(function (file, enc, cb) {
var self = this;
var extract = tar.extract();
var unzip = zlib.Unzip();
if (file.isNull()) {
cb(null, file);
return;
}
if (file.isStream()) {
cb(new Error('Streaming is not supported'));
return;
}
if (!file.extract || !isGzip(file.contents)) {
cb(null, file);
return;
}
extract.on('entry', function (header, stream, done) {
var chunk = [];
var len = 0;
stream.on('data', function (data) {
chunk.push(data);
len += data.length;
});
stream.on('end', function () {
if (header.type !== 'directory') {
self.push(new File({
contents: Buffer.concat(chunk, len),
path: stripDirs(header.name, opts.strip),
stat: objectAssign(new fs.Stats(), header)
}));
}
done();
});
});
extract.on('finish', cb);
extract.on('error', cb);
unzip.end(file.contents);
unzip.pipe(extract);
});
};