wip: update neovim stuff

we need to adapt to it

nix/base-system/flake.lock

@@ -1711,11 +1711,11 @@
     },
     "unstable": {
       "locked": {
-        "lastModified": 1747312588,
-        "narHash": "sha256-MmJvj6mlWzeRwKGLcwmZpKaOPZ5nJb/6al5CXqJsgjo=",
+        "lastModified": 1751349533,
+        "narHash": "sha256-5XRh0mB06/7WYDLu9ZXsx1GhyvvNVZDtPyg34sUCLJs=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "b1bebd0fe266bbd1820019612ead889e96a8fa2d",
+        "rev": "bdfd0f2afcf764e531d0960c821ab070a6174b15",
         "type": "github"
       },
       "original": {

nix/base-system/flake.nix

@@ -49,7 +49,6 @@
         url = "github:terrastruct/d2-vim";
         flake = false;
     };
-    # We need to pin to this version of treesitter because it breaks after this revision
     roslyn-lsp = {
         url = "github:zaphar/roslyn.nvim/main";
         flake = false;
@@ -117,15 +116,13 @@
         nixpkgs.overlays = [
             (final: prev: {
                 lorri = unstablePkgs.lorri;
-                avante-nvim = unstablePkgs.vimPlugins.avante-nvim;
-                copilot-lua = unstablePkgs.vimPlugins.copilot-lua;
             })
         ];
-        programs = with pkgs; {
+        programs = with unstablePkgs; {
           neovim.enable = true;
           neovim.vimAlias = true;
           neovim.viAlias = true;
-          #neovim.package = pkgs.custom-neovim;
+          neovim.package = unstablePkgs.neovim-unwrapped;
           neovim.configure = {
           customRC = "lua << EOF
 ${builtins.readFile ./init.lua}

nix/base-system/init.lua

@@ -20,6 +20,10 @@ vim.opt.fileformats = "unix,dos"
 -- Recommended by Avante docs
 -- views can only be fully collapsed with the global statusline
 vim.opt.laststatus = 3
+-- formatexpr defaulted to the lsp provider by default recently
+-- which breaks `gq` and company paragraph formatting in non lsp
+-- contexts.
+vim.opt.formatexpr = ""
 
 vim.g.BASH_AuthorName = 'Jeremy Wall'
 vim.g.BASH_AuthorRef = 'jw'
@@ -256,6 +260,10 @@ vim.api.nvim_create_autocmd('LspAttach', {
         if client and client.server_capabilities.codelens then
             vim.lsp.codelens.refresh()
         end
+        -- formatexpr defaulted to the lsp provider by default recently
+        -- which breaks `gq` and company paragraph formatting in non lsp
+        -- contexts.
+        vim.bo[args.buf].formatexpr = ""
     end,
 })
 
@@ -275,7 +283,6 @@ vim.api.nvim_create_autocmd({ 'BufEnter', 'InsertLeave', 'CursorHold' }, {
 -- LSP Diagnostics Options Setup
 vim.diagnostic.config({
     virtual_text = false,
-    signs = true,
     update_in_insert = true,
     underline = true,
     severity_sort = false,
@@ -707,7 +714,7 @@ function get_server_list_prompt(hub_instance)
     for _, server in ipairs(servers) do
         mcp_tool_prompt = mcp_tool_prompt .. "## server name: `" .. server.name .. "`\n\n"
 
-        if server.capabilities.tools and #server.capabilities.tools > 0 then
+        if server.capabilities and server.capabilities.tools and #server.capabilities.tools > 0 then
             mcp_tool_prompt = mcp_tool_prompt .. "Available tools:\n\n"
             for _, tool in ipairs(server.capabilities.tools) do
                 mcp_tool_prompt = mcp_tool_prompt .. "- tool name: `" .. tool.name .. "`\n"
@@ -737,7 +744,29 @@ end
 vim.keymap.set("n", "<Leader>ab", function() require('avante').get().file_selector:add_buffer_files() end)
 vim.keymap.set("n", "<Leader>af", function() require('avante').get().file_selector:add_current_buffer() end)
 
-require('copilot').setup()
+get_root_dir = function()
+    -- First try to get the root path from LSP
+    local bufnr = vim.api.nvim_get_current_buf()
+    local clients = vim.lsp.get_clients({ bufnr = bufnr })
+    
+    -- Check if we have an active LSP client with a root_dir
+    for _, client in ipairs(clients) do
+        if client.config and client.config.root_dir then
+            return client.config.root_dir
+        end
+    end
+    
+    -- Fall back to file-based detection
+    local root_file = vim.fs.find(function(name, path)
+        return name:match('(pyproject.toml|.sln|Cargo.toml|.git)$')
+    end, { upward = true })[1]
+    
+    return root_file and vim.fs.dirname(root_file) or vim.fn.getcwd()
+end
+
+require('copilot').setup({
+    root_dir = get_root_dir,
+})
 
 require('avante').setup({
     provider = "claude",