ImageGrab.grabclipboard on Linux with both X11 and Wayland installed

[TheNooB2706]

What did you do?

1. Using grabclipboard on X11 session with wl-paste utility installed regardless if xclip is installed
2. Using grabclipboard on Wayland session without wl-paste but xclip is installed

What did you expect to happen?

1. • If xclip is installed, xclip command should be used
   • If xclip is not installed, raise NotImplementedError
2. Raise NotImplementedError

What actually happened?

1. wl-paste command is used instead of xclip

>>> ImageGrab.grabclipboard()
Failed to connect to a Wayland server
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "[path redacted]/python3.11/site-packages/PIL/ImageGrab.py", line 144, in grabclipboard
    output = subprocess.check_output(["wl-paste", "-l"]).decode()
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.11/subprocess.py", line 466, in check_output
    return run(*popenargs, stdout=PIPE, timeout=timeout, check=True,
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.11/subprocess.py", line 571, in run
    raise CalledProcessError(retcode, process.args,
subprocess.CalledProcessError: Command '['wl-paste', '-l']' returned non-zero exit status 1.

3. xclip is used and failed as it cannot access Wayland clipboard

>>> ImageGrab.grabclipboard()
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "[path redacted]/lib/python3.11/site-packages/PIL/ImageGrab.py", line 165, in grabclipboard
    raise ChildProcessError(msg)
ChildProcessError: xclip error: Error: target image/png not available

What are your OS, Python and Pillow versions?

• OS: Debian 12
• Python: 3.11.2
• Pillow: 10.0.0

from PIL import ImageGrab

ImageGrab.grabclipboard()