"Exception No formatted text" raised by prompt-toolkit in interactive mode

[andy-maier]

This can be reproduced on Python 2.7 with the master branch of pywbemtools, as follows:

$ pywbemcli -n assoc
pywbemcli> cl<RIGHT-ARROW>

The result is the following exception:

Unhandled exception in event loop:
  File "/Users/maiera/virtualenvs/pywbemtools27/lib/python2.7/site-packages/prompt_toolkit/eventloop/posix.py", line 155, in _run_task
    t()
  File "/Users/maiera/virtualenvs/pywbemtools27/lib/python2.7/site-packages/prompt_toolkit/eventloop/context.py", line 116, in new_func
    return func(*a, **kw)
  File "/Users/maiera/virtualenvs/pywbemtools27/lib/python2.7/site-packages/prompt_toolkit/application/application.py", line 403, in redraw
    self._redraw()
  File "/Users/maiera/virtualenvs/pywbemtools27/lib/python2.7/site-packages/prompt_toolkit/application/application.py", line 471, in _redraw
    self.renderer.render(self, self.layout)
  File "/Users/maiera/virtualenvs/pywbemtools27/lib/python2.7/site-packages/prompt_toolkit/renderer.py", line 588, in render
    screen.draw_all_floats()
  File "/Users/maiera/virtualenvs/pywbemtools27/lib/python2.7/site-packages/prompt_toolkit/layout/screen.py", line 232, in draw_all_floats
    functions[0][1]()
  File "/Users/maiera/virtualenvs/pywbemtools27/lib/python2.7/site-packages/prompt_toolkit/layout/containers.py", line 710, in _draw_float
    width = fl.content.preferred_width(write_position.width).preferred
  File "/Users/maiera/virtualenvs/pywbemtools27/lib/python2.7/site-packages/prompt_toolkit/layout/containers.py", line 2183, in preferred_width
    return self.content.preferred_width(max_available_width)
  File "/Users/maiera/virtualenvs/pywbemtools27/lib/python2.7/site-packages/prompt_toolkit/layout/containers.py", line 1349, in preferred_width
    dont_extend=self.dont_extend_width())
  File "/Users/maiera/virtualenvs/pywbemtools27/lib/python2.7/site-packages/prompt_toolkit/layout/containers.py", line 1390, in _merge_dimensions
    preferred = get_preferred()
  File "/Users/maiera/virtualenvs/pywbemtools27/lib/python2.7/site-packages/prompt_toolkit/layout/containers.py", line 1338, in preferred_content_width
    max_available_width - total_margin_width)
  File "/Users/maiera/virtualenvs/pywbemtools27/lib/python2.7/site-packages/prompt_toolkit/layout/menus.py", line 55, in preferred_width
    menu_meta_width = self._get_menu_meta_width(500, complete_state)
  File "/Users/maiera/virtualenvs/pywbemtools27/lib/python2.7/site-packages/prompt_toolkit/layout/menus.py", line 122, in _get_menu_meta_width
    max(meta_width(c) for c in complete_state.completions) + 2)
  File "/Users/maiera/virtualenvs/pywbemtools27/lib/python2.7/site-packages/prompt_toolkit/layout/menus.py", line 122, in <genexpr>
    max(meta_width(c) for c in complete_state.completions) + 2)
  File "/Users/maiera/virtualenvs/pywbemtools27/lib/python2.7/site-packages/prompt_toolkit/layout/menus.py", line 117, in meta_width
    return get_cwidth(completion.display_meta_text)
  File "/Users/maiera/virtualenvs/pywbemtools27/lib/python2.7/site-packages/prompt_toolkit/completion/base.py", line 98, in display_meta_text
    return fragment_list_to_text(self.display_meta)
  File "/Users/maiera/virtualenvs/pywbemtools27/lib/python2.7/site-packages/prompt_toolkit/completion/base.py", line 92, in display_meta
    return to_formatted_text(self._display_meta)
  File "/Users/maiera/virtualenvs/pywbemtools27/lib/python2.7/site-packages/prompt_toolkit/formatted_text/base.py", line 50, in to_formatted_text
    'HTML, ANSI or a FormattedText instance. Got %r' % value)

Exception No formatted text. Expecting a unicode object, HTML, ANSI or a FormattedText instance. Got 'Filter the returned classes to return only deprecated classes (--deprecated) or classes that are not deprecated (--no-deprecated). If the option is not defined no filtering occurs'
Press ENTER to continue...                                                                                                  

According to Karl, this seems to be a left-over non-unicode message in common_options.py line 119.

[KSchopmeyer]

The problem was added by me when I added the --deprecated option. Forgot the unicode flag on the strings.

[andy-maier]

The fix does not need to be rolled back into 0.6 because the option on which the issue existed was introduced only in 0.7.