DRYed the backup wallet

gui/qt_util.py

@@ -1,6 +1,18 @@
 from i18n import _
 from PyQt4.QtGui import *
 from PyQt4.QtCore import *
+import os.path
+
+def backup_wallet():
+    try:
+      folderName = QFileDialog.getExistingDirectory(QWidget(), _('Select folder to save a copy of your wallet to'), os.path.expanduser('~/'))
+      if folderName:
+        # TODO: Can we get the current wallet file instead of bruteforcing the default one?
+        sourceFile = self.wallet.config.path
+        shutil.copy2(sourceFile, str(folderName))
+        QMessageBox.information(None,"Wallet backup created", _("A copy of your wallet file was created in")+" '%s'" % str(folderName))
+    except (IOError, os.error), reason:
+      QMessageBox.critical(None,"Unable to create backup", _("Electrum was unable to copy your wallet file to the specified location.")+"\n" + str(reason))
 
 def ok_cancel_buttons(dialog, ok_label=_("OK") ):
     hbox = QHBoxLayout()