Add support for black's daemon, blackd

[pelme]

Black has a new feature called blackd:

https://black.readthedocs.io/en/stable/blackd.html

blackd is a small HTTP server that exposes Black’s functionality over a simple protocol. The main benefit of using it is to avoid paying the cost of starting up a new Black process every time you want to blacken a file.

Supporting it out of the box would be useful and probably speed up formatting!

[olivierdalang]

If anyone has a setup for this in the meantime, please share it here.

[brettcannon]

Another option instead of adding specific support for blackd might be using https://github.com/rupert/pyls-black.

[karthiknadig]

We now have a black formatter extension, https://marketplace.visualstudio.com/items?itemName=ms-python.black-formatter please give it a try. This extension runs black over LSP, should be more performant than running black each time.

[magnetikonline]

We now have a black formatter extension, https://marketplace.visualstudio.com/items?itemName=ms-python.black-formatter please give it a try. This extension runs black over LSP, should be more performant than running black each time.

@karthiknadig this is a revelation! having black run as a server, re-formatting is like greased lighting now. 👍 - from the description it seems this will finally make it's way back into the vscode-python extension - wonderful.

[brettcannon]

this is a revelation!

Great!

from the description it seems this will finally make its way back into the vscode-python extension

That's actually not going to happen. The plan is to remove the Black support from the core extension and keep the support in the separate extension. This will make the core extension smaller as well as let us update the Black extension independently of the core extension (and this is why we are comfortable shipping a copy of Black in the extension itself).

[magnetikonline]

That's actually not going to happen. The plan is to remove the Black support from the core extension and keep the support in the separate extension.

Good to know @brettcannon

Worthwhile updating/deleting this line? https://github.com/microsoft/vscode-black-formatter/blob/c962ac3aa71eec9ca1471075b3a4ff832c6f6afb/README.md?plain=1#L10

If that's the case - hopefully in the end the setting can just return to "python.formatting.provider": "black", - rather than "editor.defaultFormatter": "ms-python.black-formatter", / etc. like to keep my workspace JSON's clean 😄.

[levrik]

@magnetikonline But this line is exactly saying what @brettcannon wrote here.

[magnetikonline]

Ah so it does. Reading it the wrong way! 👍

[karrtikr]

Closing this issue in context of the recent comments #3336 (comment).

cc/ @karthiknadig