[vim-go] could not determine the appropriate directory for gopls

[AugustusKwan]

Issue Description

When I try to open/edit a .go file, neovim has the error message '[vim-go] could not determine the appropriate directory for gopls'.
No Go completion message to select.Sometime it hangs for a while for loading something.

Configuration (MUST fill this out):

vim-go version:

Neovim 0.4.4

init.vim you used to reproduce:

vimrc

"Golang
Plug 'fatih/vim-go', { 'do': ':GoUpdateBinaries','for':['go','vim-plug'],'tag':'*' }
let g:go_fmt_command = "goimports" " 格式化将默认的 gofmt 替换

let g:go_autodetect_gopath = 1

let g:go_list_type = "quickfix"
let g:go_version_warning = 1

let g:go_highlight_types = 1

let g:go_highlight_fields = 1

let g:go_highlight_functions = 1

let g:go_highlight_function_calls = 1

let g:go_highlight_operators = 1

let g:go_highlight_extra_types = 1

let g:go_highlight_methods = 1

let g:go_highlight_generate_tags = 1
let g:godef_split=2
let g:go_def_mode='gopls'

let g:go_info_mode='gopls'

Vim version (first three lines from :version):

Neovim v0.4.4

Go version (go version):

Go 1.14.2

Go environment

Windows10 1909

[bhcleek]

Does this happen for you any go file that you try to open, or only some?

Are you using the linux subsystem?

[bhcleek]

Can you run go env GOMOD from the directory that contains the go file that you're trying to open and let me know what the output is?

[ghost]

I get the same error. At some point vim-go adds the module directory to GOPATH: /home/xxx/your-module:/gopath and then tries to get the value of GOMOD by calling go env GOMOD, which responds $GOPATH/go.mod exists but should not. After that vim-go says: could not determine appropriate working directory for gopls.

[ghost]

After some investigation, the culprit seems to be this line in my .vimrc:

let g:go_autodetect_gopath = 1

I commented it, and the error disappeared.

Perhaps vim-go shouldn't add a directory to GOPATH if the directory contains a go.mod file.

[bhcleek]

Do you have a src directory in your module?

[ghost]

Yes, I happen to have a src directory in my module.

[bhcleek]

👍 if you're not using gb, godep, or similar, then you don't need g:go_autodetect_gopath to be set. I've added #3076 to address the underlying issue, but we should probably just remove g:go_autodetect_gopath support fully now that modules is out and well supported by the Go toolchain, because Go modules and vendoring obviate the need for tools like gb and godep and those tools were archived long ago.