Moved zip folder, read csv and package-json to lib/fs

refs #9178, refs 849e976

- i've reconsidered, these modules belong to lib
- prettify package-json module

ghost/zip/lib/zip-folder.js

@@ -0,0 +1,27 @@
+'use strict';
+
+const fs = require('fs-extra');
+
+module.exports = function zipFolder(folderToZip, destination, callback) {
+    var archiver = require('archiver'),
+        output = fs.createWriteStream(destination),
+        archive = archiver.create('zip', {});
+
+    // If folder to zip is a symlink, we want to get the target
+    // of the link and zip that instead of zipping the symlink
+    if (fs.lstatSync(folderToZip).isSymbolicLink()) {
+        folderToZip = fs.realpathSync(folderToZip);
+    }
+
+    output.on('close', function () {
+        callback(null, archive.pointer());
+    });
+
+    archive.on('error', function (err) {
+        callback(err, null);
+    });
+
+    archive.directory(folderToZip, '/');
+    archive.pipe(output);
+    archive.finalize();
+};

ghost/zip/test/zip-folder.test.js

@@ -0,0 +1,49 @@
+var should = require('should'), // jshint ignore:line
+    path = require('path'),
+    fs = require('fs-extra'),
+    extract = require('extract-zip'),
+    fsLib = require('../../../../server/lib/fs');
+
+describe('lib/fs: read csv', function () {
+    const symlinkPath = path.join(__dirname, '..', '..', '..', 'utils', 'fixtures', 'themes', 'theme-symlink'),
+        folderToSymlink = path.join(__dirname, '..', '..', '..', 'utils', 'fixtures', 'themes', 'casper'),
+        zipDestination = path.join(__dirname, '..', '..', '..', 'utils', 'fixtures', 'themes', 'theme-symlink.zip'),
+        unzipDestination = path.join(__dirname, '..', '..', '..', 'utils', 'fixtures', 'themes', 'theme-symlink-unzipped');
+
+    before(function () {
+        fs.removeSync(symlinkPath);
+        fs.removeSync(zipDestination);
+        fs.removeSync(unzipDestination);
+    });
+
+    after(function () {
+        fs.removeSync(symlinkPath);
+        fs.removeSync(zipDestination);
+        fs.removeSync(unzipDestination);
+    });
+
+    it('ensure symlinks work', function (done) {
+        fs.symlink(folderToSymlink, symlinkPath);
+
+        fsLib.zipFolder(symlinkPath, zipDestination, function (err) {
+            if (err) {
+                return done(err);
+            }
+
+            extract(zipDestination, {dir: unzipDestination}, function (err) {
+                if (err) {
+                    return done(err);
+                }
+
+                fs.readdir(unzipDestination, function (err, files) {
+                    if (err) {
+                        return done(err);
+                    }
+
+                    files.length.should.eql(12);
+                    done();
+                });
+            });
+        });
+    });
+});