1 files changed, 91 insertions, 0 deletions
diff --git a/.config/nvim/lsp/gopls.lua b/.config/nvim/lsp/gopls.lua
new file mode 100644
index 0000000..3585808
--- /dev/null
+++ b/.config/nvim/lsp/gopls.lua
@@ -0,0 +1,91 @@
+-- https://github.com/golang/tools/tree/master/gopls
+
+local mod_cache = nil
+
+---@param fname string
+---@return string?
+local function get_root(fname)
+    if mod_cache and fname:sub(1, #mod_cache) == mod_cache then
+        local clients = vim.lsp.get_clients({ name = 'gopls' })
+        if #clients > 0 then
+            return clients[#clients].config.root_dir
+        end
+    end
+    return vim.fs.root(fname, { 'go.work', 'go.mod', '.git' })
+end
+
+return {
+    cmd = { 'gopls' },
+    filetypes = { 'go', 'gomod', 'gowork', 'gotmpl' },
+    root_dir = function(bufnr, on_dir)
+        local fname = vim.api.nvim_buf_get_name(bufnr)
+        -- see: https://github.com/neovim/nvim-lspconfig/issues/804
+        if mod_cache then
+            on_dir(get_root(fname))
+            return
+        end
+        local cmd = { 'go', 'env', 'GOMODCACHE' }
+        vim.system(cmd, { text = true }, function(output)
+            if output.code == 0 then
+                if output.stdout then
+                    mod_cache = vim.trim(output.stdout)
+                end
+                on_dir(get_root(fname))
+            else
+                vim.notify(('[gopls] cmd failed with code %d: %s\n%s'):format(output.code, cmd, output.stderr))
+            end
+        end)
+    end,
+    settings = {
+        gopls = {
+            gofumpt = true,
+            codelenses = {
+                gc_details = false,
+                generate = true,
+                regenerate_cgo = true,
+                run_govulncheck = true,
+                test = true,
+                tidy = true,
+                upgrade_dependency = true,
+                vendor = true,
+            },
+            hints = {
+                assignVariableTypes = false,
+                compositeLiteralFields = false,
+                compositeLiteralTypes = true,
+                constantValues = true,
+                functionTypeParameters = false,
+                parameterNames = false,
+                rangeVariableTypes = true,
+            },
+            analyses = {
+                fieldalignment = true,
+                nilness = true,
+                unusedparams = true,
+                unusedwrite = true,
+                useany = true,
+            },
+            usePlaceholders = false,
+            completeUnimported = true,
+            staticcheck = true,
+            directoryFilters = { '-.git', '-.vscode', '-.idea', '-.vscode-test', '-node_modules' },
+            semanticTokens = true,
+        },
+    },
+    on_attach = function(client, _)
+        -- workaround for gopls not supporting semanticTokensProvider
+        -- https://github.com/golang/go/issues/54531#issuecomment-1464982242
+        if not client.server_capabilities.semanticTokensProvider then
+            local semantic = client.config.capabilities.textDocument.semanticTokens
+            client.server_capabilities.semanticTokensProvider = {
+                full = true,
+                legend = {
+                    tokenTypes = semantic.tokenTypes,
+                    tokenModifiers = semantic.tokenModifiers,
+                },
+                range = true,
+            }
+        end
+        -- end workaround
+    end,
+}