[SR-11823] swift-format: add option to leave intra-expression spacing as is

[swift-ci]

Previous ID	SR-11823
Radar	None
Original Reporter	gwk (JIRA User)
Type	Improvement

Additional Detail from JIRA

| | | |------------------|-----------------| |Votes | 0 | |Component/s | swift-format | |Labels | Improvement | |Assignee | None | |Priority | Medium | md5: dd4f120aec6465bd8fc4e18cfdcd6098

Issue Description:

I just tried swift-format for the first time. I am quite pleased with the results, but there are two cases that I wish I could disable to preserve existing spacing:

• Multiple spaces following commas between items in a list. For example I have a vertical list of (X,Y,Z) vectors and I have added spacing to make the columns line up. More generally, this can be helpful for visually verifying grid-like patterns in code.

• Lack of spaces in between operators, e.g. `a*x + b`.

I realize that the project must strike a balance between convention and configuration. Regardless of how the developers feel about these style choices, I hope that you will consider this request on the basis of reducing barriers to entry. If it weren't for these points, then adding swift-format to my workflow would be an obvious improvement. As it is, I feel like I am making a compromise. In any case, thank you for your great work!

[ahoppen]

Tracked in Apple’s issue tracker as rdar://126948241