Move lsp config to local file structure

.config/nvim/lsp/golangci_lint_ls.lua

@@ -0,0 +1,52 @@
+---@brief
+---
+--- Combination of both lint server and client
+---
+--- https://github.com/nametake/golangci-lint-langserver
+--- https://github.com/golangci/golangci-lint
+---
+---
+--- Installation of binaries needed is done via
+---
+--- ```
+--- go install github.com/nametake/golangci-lint-langserver@latest
+--- go install github.com/golangci/golangci-lint/cmd/golangci-lint@latest
+--- ```
+
+---@type vim.lsp.Config
+return {
+  cmd = { 'golangci-lint-langserver' },
+  filetypes = { 'go', 'gomod' },
+  init_options = {
+    command = { 'golangci-lint', 'run', '--output.json.path=stdout', '--show-stats=false' },
+  },
+  root_markers = {
+    '.golangci.yml',
+    '.golangci.yaml',
+    '.golangci.toml',
+    '.golangci.json',
+    'go.work',
+    'go.mod',
+    '.git',
+  },
+  before_init = function(_, config)
+    -- Add support for golangci-lint V1 (in V2 `--out-format=json` was replaced by
+    -- `--output.json.path=stdout`).
+    local v1, v2 = false, false
+    -- PERF: `golangci-lint version` is very slow (about 0.1 sec) so let's find
+    -- version using `go version -m $(which golangci-lint) | grep '^\smod'`.
+    if vim.fn.executable 'go' == 1 then
+      local exe = vim.fn.exepath 'golangci-lint'
+      local version = vim.system({ 'go', 'version', '-m', exe }):wait()
+      v1 = string.match(version.stdout, '\tmod\tgithub.com/golangci/golangci%-lint\t')
+      v2 = string.match(version.stdout, '\tmod\tgithub.com/golangci/golangci%-lint/v2\t')
+    end
+    if not v1 and not v2 then
+      local version = vim.system({ 'golangci-lint', 'version' }):wait()
+      v1 = string.match(version.stdout, 'version v?1%.')
+    end
+    if v1 then
+      config.init_options.command = { 'golangci-lint', 'run', '--out-format', 'json' }
+    end
+  end,
+}