Add ruff as formatter for Python about vim-codefmt HOT 3 OPEN

Hadn't heard about ruff yet but it looks great!

As a formatter, do you know if

• it has built-in support for range formatting (updating only a few target lines out of a file, plus whatever surrounding lines it needs to touch to make a complete valid formatting change)
• its formatting decisions tend to be stable (avoid fighting with existing valid formatting when there are multiple valid ways to format a piece of code, such as a list that's short enough to fit on one line)
  ?

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@dbarnett As far as I know, ruff is more of a linter than a formatter. But because it has autofix support, it can also be regarded as a formatting tool (and it also have some rules related to code format).

• Yes and no, ruff not support range formatting as a command line tool, but can support range formatting with ruff-lsp.
• Yes, I think, as a linter, all rules that can be autofixed have only one way to autofix. So it not has "multiple valid ways to format a piece of code".

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Hadn't heard about ruff yet but it looks great!

As a formatter, do you know if

• it has built-in support for range formatting (updating only a few target lines out of a file, plus whatever surrounding lines it needs to touch to make a complete valid formatting change)
• its formatting decisions tend to be stable (avoid fighting with existing valid formatting when there are multiple valid ways to format a piece of code, such as a list that's short enough to fit on one line)
  ?

Sorry for the late reply, the situation with the library is basically as described by st1020

• For range formatting, I found a related issue in ruff-lsp, but there is no built-in implementation
• yes, its formatting decisions tend to be stable .

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