Remove a package

def _remove(self, args):
        '''
        Remove a package
        '''
        if len(args) < 2:
            raise SPMInvocationError('A package must be specified')

        packages = args[1:]
        msg = 'Removing packages:\n\t{0}'.format('\n\t'.join(packages))

        if not self.opts['assume_yes']:
            self.ui.confirm(msg)

        for package in packages:
            self.ui.status('... removing {0}'.format(package))

            if not self._pkgdb_fun('db_exists', self.opts['spm_db']):
                raise SPMDatabaseError('No database at {0}, cannot remove {1}'.format(self.opts['spm_db'], package))

            # Look at local repo index
            pkg_info = self._pkgdb_fun('info', package, self.db_conn)
            if pkg_info is None:
                raise SPMInvocationError('Package {0} not installed'.format(package))

            # Find files that have not changed and remove them
            files = self._pkgdb_fun('list_files', package, self.db_conn)
            dirs = []
            for filerow in files:
                if self._pkgfiles_fun('path_isdir', filerow[0]):
                    dirs.append(filerow[0])
                    continue
                file_hash = hashlib.sha1()
                digest = self._pkgfiles_fun('hash_file', filerow[0], file_hash, self.files_conn)
                if filerow[1] == digest:
                    self._verbose('Removing file {0}'.format(filerow[0]), log.trace)
                    self._pkgfiles_fun('remove_file', filerow[0], self.files_conn)
                else:
                    self._verbose('Not removing file {0}'.format(filerow[0]), log.trace)
                self._pkgdb_fun('unregister_file', filerow[0], package, self.db_conn)

            # Clean up directories
            for dir_ in sorted(dirs, reverse=True):
                self._pkgdb_fun('unregister_file', dir_, package, self.db_conn)
                try:
                    self._verbose('Removing directory {0}'.format(dir_), log.trace)
                    os.rmdir(dir_)
                except OSError:
                    # Leave directories in place that still have files in them
                    self._verbose('Cannot remove directory {0}, probably not empty'.format(dir_), log.trace)

            self._pkgdb_fun('unregister_pkg', package, self.db_conn)