Support negating and ANDing (and XORing?) selectors

[jwodder]

No description provided.

[isidroas]

That reminds me of the posix find command.

For example the following command,

$ find  \( -name '*.py' -a -executable \) -o iname 'run_*.py'

would be equivalent to the following Python expression,

SelectAny(
    SelectAll(SelectGlob('*.py'), SelectPerm(exec=True)),
    SelectGlob('run_*.py', case_insensitive=True)
)

or more succintly, using operators:

( SelectGlob('*.py') and SelectPerm(exec=True) ) or SelectGlob('run_*.py', case_insensitive=True)

[isidroas]

offtopic: I am thinking on a library with the following characteristics:

• It only filters and sorts.
• The walking is performed by the user.
• Non intrusive.
• Selectors can be translated partially to find arguments

For example:

 def user_code(path, filterer: Filter, sorter: Sorter):
     print(path)
     for child in sorted(filter(path.iterdir(), filterer), key=sorter):
         user_code(child, filterer, sorter)

Let me know if you are interested, think that we could merge the projects or have any ideas/precautions.

Thank in advance. Your project deserves more stars.