feat: Switch to rustaceanvim keymaps

neovim/default.nix

@@ -406,6 +406,27 @@ in {
       enable = true;
       settings = {
         server = {
+          on_attach = rawLua ''
+            function(client, bufnr)
+                vim.keymap.set(
+                  "n",
+                  "<leader>a",
+                  function()
+                    vim.cmd.RustLsp('codeAction') -- supports rust-analyzer's grouping
+                    -- or vim.lsp.buf.codeAction() if you don't want grouping.
+                  end,
+                  { silent = true, buffer = bufnr }
+                )
+                vim.keymap.set(
+                  "n",
+                  "K",  -- Override Neovim's built-in hover keymap with rustaceanvim's hover actions
+                  function()
+                    vim.cmd.RustLsp({'hover', 'actions'})
+                  end,
+                  { silent = true, buffer = bufnr }
+                )
+            end
+          '';
           default_settings = {
             rust-analyzer = {
               inlayHints = {