Only apply Black excludes to directories (Sourcery refactored)

[sourcery-ai]

Pull Request #215 refactored by Sourcery.

If you're happy with these changes, merge this Pull Request using the Squash and merge strategy.

NOTE: As code is pushed to the original Pull Request, Sourcery will
re-run and update (force-push) this Pull Request with new refactorings as
necessary. If Sourcery finds no refactorings at any point, this Pull Request
will be closed automatically.

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To manually merge these changes, make sure you're on the filter-only-directories branch, then run:

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git merge --ff-only FETCH_HEAD
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Help us improve this pull request!

[sourcery-ai]

Function _get_rev1_path refactored with the following changes:

• Inline variable that is immediately returned (inline-immediately-returned-variable)

[sourcery-ai]

Sourcery Code Quality Report

❌  Merging this PR will decrease code quality in the affected files by 0.32%.

Quality metrics	Before	After	Change
Complexity	16.50 🙂	16.61 🙂	0.11 👎
Method Length	97.80 🙂	97.50 🙂	-0.30 👍
Working memory	13.27 😞	13.33 😞	0.06 👎
Quality	42.92% 😞	42.60% 😞	-0.32% 👎

Other metrics	Before	After	Change
Lines	406	405	-1

Changed files	Quality Before	Quality After	Quality Change
src/darker/main.py	42.92% 😞	42.60% 😞	-0.32% 👎

Here are some functions in these files that still need a tune-up:

File	Function	Complexity	Length	Working Memory	Quality	Recommendation
src/darker/main.py	main	29 😞	396 ⛔	15 😞	19.85% ⛔	Refactor to reduce nesting. Try splitting into smaller methods. Extract out complex expressions
src/darker/main.py	_reformat_single_file	11 🙂	209 ⛔	18 ⛔	36.28% 😞	Try splitting into smaller methods. Extract out complex expressions
src/darker/main.py	format_edited_parts	10 🙂	78 🙂	11 😞	60.54% 🙂	Extract out complex expressions
src/darker/main.py	print_diff	6 ⭐	90 🙂	10 😞	64.47% 🙂	Extract out complex expressions

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• 🙂 good
• 😞 poor
• ⛔ very poor

The 👍 and 👎 indicate whether the quality has improved or gotten worse with this pull request.

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