Previews from command line no longer work

[labo-China]

Please give a brief but clear explanation of the issue. If you can, include a complete working example that demonstrates the bug. Check it can run without modifications.

When launching previews from command line (e.g. calling textual easing) , it ends up raising exceptions as following:

Traceback (most recent call last):
File "/home/labo/prog/NCSbox/venv/bin/textual", line 8, in
sys.exit(run())
^^^^^
File "/home/labo/prog/NCSbox/venv/lib/python3.11/site-packages/click/core.py", line 1130, in call
return self.main(*args, **kwargs)
^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/home/labo/prog/NCSbox/venv/lib/python3.11/site-packages/click/core.py", line 1055, in main
rv = self.invoke(ctx)
^^^^^^^^^^^^^^^^
File "/home/labo/prog/NCSbox/venv/lib/python3.11/site-packages/click/core.py", line 1657, in invoke
return _process_result(sub_ctx.command.invoke(sub_ctx))
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/home/labo/prog/NCSbox/venv/lib/python3.11/site-packages/click/core.py", line 1404, in invoke
return ctx.invoke(self.callback, **ctx.params)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/home/labo/prog/NCSbox/venv/lib/python3.11/site-packages/click/core.py", line 760, in invoke
return __callback(*args, **kwargs)
^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/home/labo/prog/NCSbox/venv/lib/python3.11/site-packages/textual_dev/cli.py", line 109, in easing
from textual.cli.previews import easing
ModuleNotFoundError: No module named 'textual.cli'

From exception prompts we can know that this is due to misplacement of files in refactoring dev tools, which means textual-dev/previews should be placed in textual/cli/previews. After moving files mannually, everything works fine.

I don`t know whether the preview feature should be preserved in textual or move into textual-dev. I would like to create a PR to fix it if I know where it should be.

[labo-China]

By the way, the BORDER attribute in constants.py is also missing when running textual borders or textual easing

[TomJGooding]

What version of textual and textual-dev are you running? It looks like this was already moved a few weeks ago.

[davep]

As @TomJGooding points out above, it would be helpful if you could say what versions you're using, and also how you have your Python and Textual development environments set up. On the surface it would seem that you have an environment that has some mixed up versions.

Here's me setting up a brand new virtual environment with textual and textual-dev and running the samples just fine:

Screen.Recording.2023-07-15.at.08.24.21.mov

Could you perhaps explain how you go about doing this?

[labo-China]

Oops, it was my mistake. I used an mirror site for PIP to download and upgrade packages for faster speed. It turns out that the mirror site was kind of out-dated and gave me textual 0.29.0 and textual-dev 0.0.2. After I unset the mirror site and did a upgrade, the out-dated textual-dev package is up-to-date. Sorry for inconvenience and bothering (T_T).