Is there a way to run code actions on save in Vim? The way it works for VSCode is the source.organizeImports code action is run on save, and that runs goimports on the file. I am not familiar with the specifics of the configuration for Vim, so this question may be better directed at that repository.

I would suggest this is a question for the LanguageClient plugin in the first instance.

Unless you have already asked the question there @jbizzle?

Thanks to everyone for your replies. Will try and aggregate response to all of them here:

@myitcv -- I hadn't filed an issue there yet, since I wasn't sure that the problem was there. But maybe now that is the consensus.

@stamblerre -- There may be, though it's not clear to me yet how to configure LanguageClient to do so. I logged IO to gopls and, following the sample configuration on the gopls wiki only, see that it is not enough to automatically get the code action commands on save:

==> 0_build/_tmp/language_client.log.in <==
Content-Length: 224

{"jsonrpc":"2.0","method":"textDocument/formatting","params":{"options":{"insertSpaces":false,"tabSize":4},"textDocument":{"uri":"file:///dir/test.go"}},"id":9}
==> 0_build/_tmp/language_client.log.out <==
Content-Length: 36

{"jsonrpc":"2.0","result":[],"id":9}

However, if I explicitly call the code action command from within vim using the language client Vim function (not documented well), it seems to get suggestions from gopls but does not actually add them to my buffer in the editor:

==> 0_build/_tmp/language_client.log.in <==
Content-Length: 283

{"jsonrpc":"2.0","method":"textDocument/codeAction","params":{"context":{"diagnostics":[]},"range":{"end":{"character":2,"line":2},"start":{"character":2,"line":2}},"textDocument":{"uri":"file:///dir/test.go"}},"id":10}
==> 0_build/_tmp/language_client.log.out <==
Content-Length: 402

{"jsonrpc":"2.0","result":[{"title":"Organize Imports","kind":"source.organizeImports","edit":{"changes":{"file:///dir/test.go":[{"range":{"start":{"line":2,"character":0},"end":{"line":2,"character":0}},"newText":"import \"log\"\n"},{"range":{"start":{"line":2,"character":0},"end":{"line":2,"character":0}},"newText":"\n"}]}}}],"id":10}

So I guess there are two problems:

1. Language Client itself doesn't seem to document or even support how to properly invoke and use code actions from a language server. That is an issue for that project, and I can file it separately.

2. The gopls wiki itself suggests a configuration for Language Client which appears to be incomplete or no longer adequate to accomplish what it says. If that's the case, then maybe better to just not show the configuration at all?

The settings on the Wiki were mostly contributed by users, so I imagine that if someone added this setting, they were able to use it in conjunction with another plugin that does goimports or something like that. It would be ideal to have a more complete configuration listed, but as these are user-contributed configurations, I'd rather not hide them. If someone finds a good solution, I would encourage them to add it to the wiki.

It seems to me that this a feature request / issue for the LanguageClient plugin, so I will close this issue for now.