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Gopls: Using Vim or Neovim

vim-go

Use vim-go ver 1.20+, with the following configuration:

let g:go_def_mode='gopls'
let g:go_info_mode='gopls'

LanguageClient-neovim

Use LanguageClient-neovim, with the following configuration:

" Launch gopls when Go files are in use
let g:LanguageClient_serverCommands = {
       \ 'go': ['gopls']
       \ }
" Run gofmt on save
autocmd BufWritePre *.go :call LanguageClient#textDocument_formatting_sync()

Ale

Use ale:

let g:ale_linters = {
  \ 'go': ['gopls'],
  \}

see this issue

vim-lsp

Use prabirshrestha/vim-lsp, with the following configuration:

augroup LspGo
  au!
  autocmd User lsp_setup call lsp#register_server({
      \ 'name': 'go-lang',
      \ 'cmd': {server_info->['gopls']},
      \ 'whitelist': ['go'],
      \ })
  autocmd FileType go setlocal omnifunc=lsp#complete
  "autocmd FileType go nmap <buffer> gd <plug>(lsp-definition)
  "autocmd FileType go nmap <buffer> ,n <plug>(lsp-next-error)
  "autocmd FileType go nmap <buffer> ,p <plug>(lsp-previous-error)
augroup END

vim-lsc

Use natebosch/vim-lsc, with the following configuration:

let g:lsc_server_commands = {
\  "go": {
\    "command": "gopls serve",
\    "log_level": -1,
\    "suppress_stderr": v:true,
\  },
\}

The log_level and suppress_stderr parts are needed to prevent breakage from logging. See issues #180 and #213.

coc.nvim

Use coc.nvim, with the following coc-settings.json configuration:

  "languageserver": {
    "go": {
      "command": "gopls",
      "rootPatterns": ["go.work", "go.mod", ".vim/", ".git/", ".hg/"],
      "filetypes": ["go"],
      "initializationOptions": {
        "usePlaceholders": true
      }
    }
  }

If you use go.work files, you may want to set the workspace.workspaceFolderCheckCwd option. This will force coc.nvim to search parent directories for go.work files, even if the current open directory has a go.mod file. See the coc.nvim documentation for more details.

Other settings can be added in initializationOptions too.

The editor.action.organizeImport code action will auto-format code and add missing imports. To run this automatically on save, add the following line to your init.vim:

autocmd BufWritePre *.go :call CocAction('runCommand', 'editor.action.organizeImport')

govim

In vim classic only, use the experimental govim, simply follow the install steps.

Neovim v0.5.0+

To use the new native LSP client in Neovim, make sure you install Neovim v.0.5.0+, the nvim-lspconfig configuration helper plugin, and check the gopls configuration section there.

Installation

You can use Neovim's native plugin system. On a Unix system, you can do that by cloning the nvim-lspconfig repository into the correct directory:

dir="${HOME}/.local/share/nvim/site/pack/nvim-lspconfig/opt/nvim-lspconfig/"
mkdir -p "$dir"
cd "$dir"
git clone 'https://github.com/neovim/nvim-lspconfig.git' .

Configuration

nvim-lspconfig aims to provide reasonable defaults, so your setup can be very brief.

local lspconfig = require("lspconfig")
lspconfig.gopls.setup({})

However, you can also configure gopls for your preferences. Here's an example that enables unusedparams, staticcheck, and gofumpt.

local lspconfig = require("lspconfig")
lspconfig.gopls.setup({
  settings = {
    gopls = {
      analyses = {
        unusedparams = true,
      },
      staticcheck = true,
      gofumpt = true,
    },
  },
})

Imports and Formatting

Use the following configuration to have your imports organized on save using the logic of goimports and your code formatted.

autocmd("BufWritePre", {
  pattern = "*.go",
  callback = function()
    local params = vim.lsp.util.make_range_params()
    params.context = {only = {"source.organizeImports"}}
    -- buf_request_sync defaults to a 1000ms timeout. Depending on your
    -- machine and codebase, you may want longer. Add an additional
    -- argument after params if you find that you have to write the file
    -- twice for changes to be saved.
    -- E.g., vim.lsp.buf_request_sync(0, "textDocument/codeAction", params, 3000)
    local result = vim.lsp.buf_request_sync(0, "textDocument/codeAction", params)
    for cid, res in pairs(result or {}) do
      for _, r in pairs(res.result or {}) do
        if r.edit then
          local enc = (vim.lsp.get_client_by_id(cid) or {}).offset_encoding or "utf-16"
          vim.lsp.util.apply_workspace_edit(r.edit, enc)
        end
      end
    end
    vim.lsp.buf.format({async = false})
  end
})

Omnifunc

In Neovim v0.8.1 and later if you don't set the option omnifunc, it will auto set to v:lua.vim.lsp.omnifunc. If you are using an earlier version, you can configure it manually:

local on_attach = function(client, bufnr)
  -- Enable completion triggered by <c-x><c-o>
  vim.api.nvim_buf_set_option(bufnr, 'omnifunc', 'v:lua.vim.lsp.omnifunc')
end
require('lspconfig').gopls.setup({
   on_attach = on_attach
})

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