Incremental formatting

[nrc]

We should have a formatting mode where we take a date/time as an arg and only format files which have been modified after that date/time. In conjunction with a make file or cargo plugin, that would allow us to do incremental (at the file-level) re-formatting.

[kamalmarhubi]

Could the aims of this be achieved by formatting based on a diff?

[nrc]

It could. It is a bit less flexible since it requires a diff which means you need to be running version control. OTOH, it would be more precise and thus less code would get reformatted. It does seem a much harder problem to solve too, although obviously it is a nice thing to have in its own right.

[topecongiro]

Is this still a high priority?

[kamalmarhubi]

@topecongiro you may also be interested in #434, and the initial work (almost a year ago now :/) in #1007.

[nrc]

@topecongiro It is not high priority, I think, though I would still like to do it (it would be very helpful, but only for very large codebases). #434 is much more important because it is useful for IDE support.

[topecongiro]

@kamalmarhubi @nrc Thanks for comments! I will take a look at #434.