Extended neovim config customized the UI a bit more.

neovim/lua/keybindings/compe.lua

@@ -41,6 +41,6 @@ vim.api.nvim_set_keymap("i", "<S-Tab>", "v:lua.s_tab_complete()", {expr = true})
 vim.api.nvim_set_keymap("s", "<S-Tab>", "v:lua.s_tab_complete()", {expr = true})
 
 local opts = {noremap = true, silent = true, expr = true}
-vim.api.nvim_set_keymap("i", "<CR>", [[compe#confirm('<cr>')]], opts)
+vim.api.nvim_set_keymap("i", "<CR>", [[compe#confirm({'keys': "\<Plug>delimitMateCR", 'mode': ''})]], opts)
 vim.api.nvim_set_keymap("i", "<c-c>", [[compe#complete()]], opts)
 vim.api.nvim_set_keymap("i", "<c-e>", [[compe#close('<c-e>')]], opts)

neovim/lua/lsp/init.lua

@@ -5,16 +5,58 @@ capabilities.textDocument.completion.completionItem.snippetSupport = true
 
 lsp_config.gopls.setup{
     capabilities = capabilities,
+    settings = {
+        gopls = {
+            analyses = {
+                unusedparams = true,
+            },
+            staticcheck = true,
+        },
+    },
 }
 
 lsp_config.rust_analyzer.setup{
     capabilities = capabilities,
 }
 
+lsp_config.sumneko_lua.setup{
+    cmd = {'/usr/bin/lua-language-server'},
+    capabilities = capabilities,
+    settings = {
+        Lua = {
+            runtime = {
+                -- Tell the language server which version of Lua you're using (most likely LuaJIT in the case of Neovim)
+                version = 'LuaJIT',
+                -- Setup your lua path
+                path = vim.split(package.path, ';'),
+            },
+            diagnostics = {
+                -- Get the language server to recognize the `vim` global
+                globals = {'vim'},
+            },
+            workspace = {
+                -- Make the server aware of Neovim runtime files
+                library = {
+                    [vim.fn.expand('$VIMRUNTIME/lua')] = true,
+                    [vim.fn.expand('$VIMRUNTIME/lua/vim/lsp')] = true,
+                },
+            },
+            -- Do not send telemetry data containing a randomized but unique identifier
+            telemetry = {
+                enable = false,
+            },
+        },
+    },
+}
+
 vim.lsp.handlers["textDocument/publishDiagnostics"] = vim.lsp.with(
     vim.lsp.diagnostic.on_publish_diagnostics, {
         underline = true,
-        virtual_text = false,
+        virtual_text = {
+            prefix = " » ",
+            spacing = 8,
+            severity_limit = "Error",
+        },
         signs = true,
         update_in_insert = true,
     }

neovim/lua/plugins/init.lua

@@ -40,6 +40,15 @@ return require('packer').startup(function()
         'AckslD/nvim-whichkey-setup.lua',
         requires = {'liuchengxu/vim-which-key'}
     }
+    use {
+        'akinsho/nvim-bufferline.lua',
+
+        requires = 'kyazdani42/nvim-web-devicons',
+
+        config = function()
+            require('bufferline').setup{}
+        end
+    }
 
     -- Utilities
     use 'editorconfig/editorconfig-vim'
@@ -156,9 +165,7 @@ return require('packer').startup(function()
                 },
             }
 
-            vim.api.nvim_command [[
-            autocmd CursorHold,CursorHoldI * :lua require('lspsaga.diagnostic').show_line_diagnostics()
-            ]]
+            vim.api.nvim_command [[autocmd CursorHold,CursorHoldI * :lua require('lspsaga.signaturehelp').signature_help()]]
         end
     }
     use {

neovim/lua/treesitter/init.lua

@@ -51,3 +51,6 @@ ts_configs.setup {
         }
     }
 }
+
+vim.cmd [[set foldmethod=expr]]
+vim.cmd [[set foldexpr=nvim_treesitter#foldexpr()]]