def openDirectory(self, path=None):
"""
Opens a folder. If None, opes the document folder if any, or else
the current working directory in the default KDE file manager.
"""
if path is None:
d = self.mainwin.currentDocument()
if d.url().isEmpty():
if d.localFileManager():
path = d.localFileManager().directory
else:
path = self.mainwin.app.defaultDirectory() or os.getcwd()
else:
path = d.url().resolved(KUrl('.'))
url = KUrl(path)
url.adjustPath(KUrl.RemoveTrailingSlash)
sip.transferto(KRun(url, self.mainwin), None) # C++ will delete it
