Don't allow CHADtree to change what it points to

home-manager/home.nix

@@ -243,7 +243,8 @@
       }
       {
         plugin = nixpkgs.vimPlugins.chadtree;
-        config = builtins.readFile ./nvim/chadtree.vim;
+        config = builtins.readFile ./nvim/chadtree.lua;
+        type = "lua";
       }
       {
         plugin = nixpkgs.vimPlugins.coq_nvim;

home-manager/nvim/chadtree.lua

@@ -0,0 +1,57 @@
+vim.g.chadtree_settings = { xdg = true }
+
+vim.api.nvim_create_autocmd("VimEnter", {
+	pattern = "*",
+	command = "CHADopen --nofocus",
+})
+
+vim.api.nvim_create_autocmd("BufEnter", {
+	pattern = "*",
+	callback = function()
+		if vim.fn.winnr("$") == 1 and vim.bo.filetype == "CHADTree" then
+			vim.cmd("quit")
+		end
+	end,
+})
+
+-- Variable to store the CHADtree window ID
+local chadtree_winid_and_buf = nil
+
+-- Function to check if a window is displaying CHADtree
+local function is_chadtree_window(winid)
+	local bufnr = vim.api.nvim_win_get_buf(winid)
+	local filetype = vim.api.nvim_get_option_value("filetype", { buf = bufnr })
+	return filetype == "CHADTree"
+end
+
+-- Function to find and store the CHADtree window ID
+local function find_chadtree_window()
+	for _, winid in ipairs(vim.api.nvim_list_wins()) do
+		if is_chadtree_window(winid) then
+			chadtree_winid_and_buf = { winid, vim.api.nvim_win_get_buf(winid) }
+			break
+		end
+	end
+end
+
+-- Function to switch to CHADtree buffer in the CHADtree window
+local function switch_to_chadtree()
+	if chadtree_winid_and_buf and vim.api.nvim_win_is_valid(chadtree_winid_and_buf[1]) then
+		local current_winid = vim.api.nvim_get_current_win()
+		if current_winid == chadtree_winid_and_buf[1] and not is_chadtree_window(current_winid) then
+			print("CHADtree window may only point to CHADtree")
+			vim.api.nvim_win_set_buf(chadtree_winid_and_buf[1], chadtree_winid_and_buf[2])
+		end
+	end
+end
+
+-- Autocommand to find the CHADtree window after startup
+vim.api.nvim_create_autocmd("VimEnter", {
+	callback = function()
+		vim.defer_fn(find_chadtree_window, 500)
+	end,
+})
+
+vim.api.nvim_create_autocmd("BufEnter", {
+	callback = switch_to_chadtree,
+})

home-manager/nvim/chadtree.vim

@@ -1,4 +0,0 @@
-let g:chadtree_settings = {'xdg': v:true}
-
-autocmd VimEnter * CHADopen --nofocus
-autocmd bufenter * if (winnr("$") == 1 && &filetype == 'CHADtree') | q | endif