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019d9aebe9
## Summary
This PR implement's Black's new single-argument hugging for lists, sets,
and dictionaries under preview style.
For example, this:
```python
foo(
[
1,
2,
3,
]
)
```
Would instead now be formatted as:
```python
foo([
1,
2,
3,
])
```
A couple notes:
- This doesn't apply when the argument has a magic trailing comma.
- This _does_ apply when the argument is starred or double-starred.
- We don't apply this when there are comments before or after the
argument, though Black does in some cases (and moves the comments
outside the call parentheses).
It doesn't say it in the originating PR
(https://github.com/psf/black/pull/3964), but I think this also applies
to parenthesized expressions? At least, it does in my testing of preview
vs. stable, though it's possible that behavior predated the linked PR.
See: #8279.
## Test Plan
Before:
| project | similarity index | total files | changed files |
|----------------|------------------:|------------------:|------------------:|
| cpython | 0.75804 | 1799 | 1648 |
| django | 0.99984 | 2772 | 34 |
| home-assistant | 0.99963 | 10596 | 146 |
| poetry | 0.99925 | 317 | 12 |
| transformers | 0.99967 | 2657 | 322 |
| twine | 1.00000 | 33 | 0 |
| typeshed | 0.99980 | 3669 | 18 |
| warehouse | 0.99977 | 654 | 13 |
| zulip | 0.99970 | 1459 | 21 |
After:
| project | similarity index | total files | changed files |
|----------------|------------------:|------------------:|------------------:|
| cpython | 0.75804 | 1799 | 1648 |
| django | 0.99984 | 2772 | 34 |
| home-assistant | 0.99963 | 10596 | 146 |
| poetry | 0.96215 | 317 | 34 |
| transformers | 0.99967 | 2657 | 322 |
| twine | 1.00000 | 33 | 0 |
| typeshed | 0.99980 | 3669 | 18 |
| warehouse | 0.99977 | 654 | 13 |
| zulip | 0.99970 | 1459 | 21 |
|
||
|---|---|---|
| .. | ||
| snapshots | ||
| fixtures.rs | ||
| normalizer.rs | ||