from prompt_toolkit.layout.toolbars import Toolbar
from prompt_toolkit.layout.utils import TokenList
from pygments.token import Token

class PGToolbar(Toolbar):
    def __init__(self, token=None):
        token = token or Token.Toolbar.Status
        super(self.__class__, self).__init__(token=token)

    def get_tokens(self, cli, width):
        result = TokenList()
        result.append((self.token, ' '))
        if cli.current_buffer.completer.smart_completion:
            result.append((self.token.On, '[F2] Smart Completion: ON  '))
        else:
            result.append((self.token.Off, '[F2] Smart Completion: OFF  '))

        if cli.current_buffer.always_multiline:
            result.append((self.token.On, '[F3] Multiline: ON'))
        else:
            result.append((self.token.Off, '[F3] Multiline: OFF'))

        if cli.current_buffer.always_multiline:
            result.append((self.token,
                ' (Semi-colon [;] will end the line)'))

        return result

from prompt_toolkit.layout.toolbars import Toolbar
from prompt_toolkit.layout.utils import TokenList
from pygments.token import Token

class PGToolbar(Toolbar):
    def __init__(self, token=None):
        token = token or Token.Toolbar.Status
        super(self.__class__, self).__init__(token=token)

    def get_tokens(self, cli, width):
        result = TokenList()
        result.append((self.token, ' '))
        if cli.buffers['default'].completer.smart_completion:
            result.append((self.token.On, '[F2] Smart Completion: ON  '))
        else:
            result.append((self.token.Off, '[F2] Smart Completion: OFF  '))

        if cli.buffers['default'].always_multiline:
            result.append((self.token.On, '[F3] Multiline: ON'))
        else:
            result.append((self.token.Off, '[F3] Multiline: OFF'))

        if cli.buffers['default'].always_multiline:
            result.append((self.token,
                ' (Semi-colon [;] will end the line)'))

        return result

Use the default buffer instead of current_buffer.