refacto: use locally installed lsp

Also enable LSP for rust, lua, go and python.

init.lua

@@ -562,11 +562,46 @@ require('lazy').setup({
       --  - capabilities (table): Override fields in capabilities. Can be used to disable certain LSP features.
       --  - settings (table): Override the default settings passed when initializing the server.
       --        For example, to see the options for `lua_ls`, you could go to: https://luals.github.io/wiki/settings/
-      local servers = {
-        -- clangd = {},
-        -- gopls = {},
-        -- pyright = {},
-        -- rust_analyzer = {},
+      local lspconfig = require 'lspconfig'
+
+      lspconfig.clangd.setup {
+        capabilities = capabilities,
+      }
+      lspconfig.gopls.setup {
+        capabilities = capabilities,
+      }
+      lspconfig.pylsp.setup {
+        capabilities = capabilities,
+      }
+
+      local on_attach = function(client, bufnr)
+        -- require'completion'.on_attach(client)
+        vim.lsp.inlay_hint.enable(true, { bufnr = bufnr })
+      end
+
+      lspconfig.rust_analyzer.setup {
+        capabilities = capabilities,
+        on_attach = on_attach,
+        ['rust-analyzer'] = {
+          diagnostics = {
+            enable = true,
+          },
+          imports = {
+            granularity = {
+              group = 'module',
+            },
+            prefix = 'self',
+          },
+          cargo = {
+            buildScripts = {
+              enable = true,
+            },
+          },
+          procMacro = {
+            enable = true,
+          },
+        },
+      }
       -- ... etc. See `:help lspconfig-all` for a list of all the pre-configured LSPs
       --
       -- Some languages (like typescript) have entire language plugins that can be useful:
@@ -576,50 +611,44 @@ require('lazy').setup({
       -- tsserver = {},
       --
 
-        lua_ls = {
+      lspconfig.lua_ls.setup {
         -- cmd = {...},
         -- filetypes = { ...},
         -- capabilities = {},
+        capabilities = capabilities,
         settings = {
           Lua = {
             completion = {
               callSnippet = 'Replace',
             },
+            runtime = {
+              -- Tell the language server which version of Lua you're using (most likely LuaJIT in the case of Neovim)
+              version = 'LuaJIT',
+            },
+            diagnostics = {
+              -- Get the language server to recognize the `vim` global
+              globals = { 'vim' },
+            },
+            workspace = {
+              -- Make the server aware of Neovim runtime files
+              library = vim.api.nvim_get_runtime_file('', true),
+            },
+            -- Do not send telemetry data containing a randomized but unique identifier
+            telemetry = {
+              enable = false,
+            },
             -- You can toggle below to ignore Lua_LS's noisy `missing-fields` warnings
             -- diagnostics = { disable = { 'missing-fields' } },
           },
         },
-        },
       }
 
-      -- Ensure the servers and tools above are installed
-      --  To check the current status of installed tools and/or manually install
-      --  other tools, you can run
-      --    :Mason
-      --
-      --  You can press `g?` for help in this menu.
-      require('mason').setup()
-
       -- You can add other tools here that you want Mason to install
       -- for you, so that they are available from within Neovim.
       local ensure_installed = vim.tbl_keys(servers or {})
       vim.list_extend(ensure_installed, {
         'stylua', -- Used to format Lua code
       })
-      require('mason-tool-installer').setup { ensure_installed = ensure_installed }
-
-      require('mason-lspconfig').setup {
-        handlers = {
-          function(server_name)
-            local server = servers[server_name] or {}
-            -- This handles overriding only values explicitly passed
-            -- by the server configuration above. Useful when disabling
-            -- certain features of an LSP (for example, turning off formatting for tsserver)
-            server.capabilities = vim.tbl_deep_extend('force', {}, capabilities, server.capabilities or {})
-            require('lspconfig')[server_name].setup(server)
-          end,
-        },
-      }
     end,
   },