Allow to exclude files if they contain a specific order of unwanted directories

[JohannesWiesner]

Example:

I only want files that include pre/standard_direct in their filepath but I want to drop files that contain pre/standard.

Because the string pre/standard_direct contains pre/standard it's hard to work with exact string matches. If I tell nisupply to exclude all strings that include pre/standard, I would also exclude pre/standard_direct.

This would be basically an extension to the exclude_dirs argument (maybe exclude_nested_dirs would be a good name for this argument?)

[JohannesWiesner]

This logic was already implemented in the past:

nisupply/nisupply.py

Lines 90 to 107 in fa69fac

	# Filter list of found files by deleting filepaths from list whose path
	# components do not match any of the given preceding directories
	if preceding_dirs:
	# if only one preceding_dirs is provided as string, convert to list
	# of single string
	if isinstance(preceding_dirs,str):
	preceding_dirs = [preceding_dirs]
	tagged_files_indices = []
	for idx,filepath in enumerate(filepath_list):
	if not any(path_component in filepath.split(os.sep) for path_component in preceding_dirs):
	tagged_files_indices.append(idx)
	for idx in sorted(tagged_files_indices,reverse=True):
	del filepath_list[idx]

We can split up each filepath into its path components (break on os.sep). We can also split up the user input into it's path components. We can then check if the filepath contains a chain of path components that match the input path components.