[nvim] feat: use nvim_lsp_installer

manage lsp servers through nvim's plugin

!!! BREAKING: requires npm
check https://github.com/williamboman/nvim-lsp-installer.git

.config/nvim/lua/plugin/lsp_installer.lua

@@ -0,0 +1,29 @@
+-- Author        : swytch
+-- Created       : Saturday Sept. 11, 2021 22:12:33 CET
+-- License       : GPLv3
+-- Description   : nvim-lsp-installer plugin config file
+
+local lsp_installer = require("nvim-lsp-installer")
+
+lsp_installer.settings {
+    ui = {
+        icons = {
+            server_installed = "✓",
+            server_pending = "➜",
+            server_uninstalled = "✗"
+        }
+    }
+}
+
+lsp_installer.on_server_ready(function(server)
+    local opts = {}
+
+    -- (optional) Customize the options passed to the server
+    -- if server.name == "tsserver" then
+    --     opts.root_dir = function() ... end
+    -- end
+
+    -- This setup() function is exactly the same as lspconfig's setup function (:help lspconfig-quickstart)
+    server:setup(opts)
+    vim.cmd [[ do User LspAttachBuffers ]]
+end)

.config/nvim/lua/plugins.lua

@@ -48,6 +48,15 @@ return require("packer").startup(function()
         }
 
         -- LSP
+        use {
+                "williamboman/nvim-lsp-installer",
+                cmd = {
+                        "LspInstall",
+                        "LspInstallInfo"
+                },
+                config = function() require("plugin.lsp_installer").setup() end
+        }
+
         use {
                 "neovim/nvim-lspconfig",
                 ft = { "c", "cpp", "lua", "python", "tex"},