testing on_attach with golang

config/init.lua

@@ -49,9 +49,40 @@ vim.cmd([[
 -- language server setup
 local lspconfig = require('lspconfig')
 
+local on_attach = function(_, bufnr)
+    -- key mappings
+    local opts = {
+        buffer = bufnr,
+        noremap = true,
+        silent = true,
+        focusable = false,
+        border = 'rounded',
+        source = 'always',
+        prefix = ' ',
+        scope = 'cursor',
+        close_events = { "BufLeave","CursorMoved","InsertEnter","FocusLost" },
+    }
+    -- error viewing
+    vim.keymap.set('n', '<leader>e', vim.diagnostic.open_float, opts)
+    vim.keymap.set('n', '<leader>[d', vim.diagnostic.goto_prev, opts)
+    vim.keymap.set('n', '<leader>]d', vim.diagnostic.goto_next, opts)
+    -- def viewing/rename
+    vim.keymap.set('n', '<leader>gD', vim.lsp.buf.declaration, opts)
+    vim.keymap.set('n', '<leader>gd', vim.lsp.buf.definition, opts)
+    vim.keymap.set('n', '<leader>rn', vim.lsp.buf.rename, opts)
+    vim.keymap.set('n', '<leader>H', vim.lsp.buf.hover, opts)
+    -- auto hover for error viewing
+    vim.api.nvim_create_autocmd("CursorHold", {
+        callback = function()
+            vim.diagnostic.open_float(nil, opts)
+        end
+    })
+end
+
 -- Go
 lspconfig.gopls.setup{
     cmd = {"gopls", "serve"},
+    on_attach = on_attach,
     filetypes = {"go", "gomod"},
     settings = {
         gopls = {
@@ -98,24 +129,19 @@ vim.diagnostic.config({
 
 vim.o.updatetime = 250
 
-vim.api.nvim_create_autocmd("CursorHold", {
-    buffer = bufnr,
-    callback = function()
-        local opts = {
-            focusable = false,
-            close_events = { "BufLeave", "CursorMoved", "InsertEnter", "FocusLost" },
-            border = 'rounded',
-            source = 'always',
-            prefix = ' ',
-            scope = 'cursor',
-        }
-        vim.diagnostic.open_float(nil, opts)
-    end
+vim.api.nvim_create_autocmd('LspAttach', {
+    callback = function(ev)
+        local opts = { buffer = ev.buf }
+        -- error viewing
+        vim.keymap.set('n', '<leader>e', vim.diagnostic.open_float, opts)
+        vim.keymap.set('n', '<leader>[d', vim.diagnostic.goto_prev, opts)
+        vim.keymap.set('n', '<leader>]d', vim.diagnostic.goto_next, opts)
+        -- def viewing/rename
+        vim.keymap.set('n', '<leader>gD', vim.lsp.buf.declaration, opts)
+        vim.keymap.set('n', '<leader>gd', vim.lsp.buf.definition, opts)
+        vim.keymap.set('n', '<leader>rn', vim.lsp.buf.rename, opts)
+        vim.keymap.set('n', '<leader>H', vim.lsp.buf.hover, opts)
+    end,
 })
 
--- lsp mappingsd
-vim.keymap.set('n', '<leader>e', vim.diagnostic.open_float, opts)
-vim.keymap.set('n', '<leader>gD', vim.lsp.buf.declaration, opts)
-vim.keymap.set('n', '<leader>gd', vim.lsp.buf.definition, opts)
-vim.keymap.set('n', '<leader>rn', vim.lsp.buf.rename, opts)
-vim.keymap.set('n', '<leader>H', vim.lsp.buf.hover, opts)
+