Thanks for the report. gopls doesn't currently support any custom formatters apart from gofumpt yet, and it's not likely that we will add support for this in the near future. Transferring to the VS Code Go repo in case @hyangah has alternative ideas for supporting custom formatters in VS Code Go.

@stamblerre Is there an option to disable gopls's formatting support? As discussed in microsoft/vscode#72315 and microsoft/vscode#41882 at length, multiple formatters from the same extension is not recommended.

I am not sure how many other formatters out there - is there any other formatter to consider?

Re: golines - as discussed in slack, most of formatting decisions golines makes do not follow Go best practice while a couple of them are still something to consider. For example, wrapping long case lists, long comments could be handy and not be too far off of Go best practice if offered as code action or commands.

@stamblerre Is there an option to disable gopls's formatting support? As discussed in microsoft/vscode#72315 and microsoft/vscode#41882 at length, multiple formatters from the same extension is not recommended.

Would it be possible to apply additional formatting in the language client's middleware?

@stamblerre We can intercept all the formatting requests and not forwarding the requests. Given that most of alternative formatters will run the default gofmt, I don't see a value of forwarding or post processing the requests.

I fear we need to add an additional setting to override gopls's feature. Or is there any existing setting we can reference?

What other formatters do users want to use?

Or is there any existing setting we can reference?

There is formatTool, but I'm not sure if it's the right choice.

What other formatters do users want to use?

I honestly wasn't aware of golines until this issue, so I'm not sure.

BTW, golines lets you use a base formatter (such as gofumports) (so I'm using run on save here):

"emeraldwalk.runonsave": {
        "commands": [
            {
                "match": "\\.go$",
                "cmd": "golines ${file} -w -m 120 --base-formatter=\"gofumports\""
            },
        ]
    },

Note: after 0.1.0 release, gofumpt will include gofumports by default so the above will need to change to gofumpt.

You can now setting "go.formatTool": "golines" and it will work together with gopls. Closing.