use tree-sitter w/neovim

.gitmodules

@@ -177,3 +177,6 @@
 [submodule ".local/share/nvim/site/pack/kejadlen/start/lint"]
 	path = .local/share/nvim/site/pack/kejadlen/start/lint
 	url = https://github.com/mfussenegger/nvim-lint.git
+[submodule ".local/share/nvim/site/pack/kejadlen/start/treesitter"]
+	path = .local/share/nvim/site/pack/kejadlen/start/treesitter
+	url = https://github.com/nvim-treesitter/nvim-treesitter.git

.local/share/nvim/site/pack/kejadlen/start/treesitter

@@ -0,0 +1 @@
+Subproject commit c2f76ae970924b83ac803d2076b3d9ad33161836

nvim/fnl/init.fnl

@@ -103,6 +103,17 @@
 ; https://github.com/tpope/vim-vinegar/issues/13
 (set vim.g.netrw_home "~/.nvim_tmp")
 
+;;; tree-sitter
+
+(let [configs (require :nvim-treesitter.configs)
+      {: setup} configs]
+  (setup {:ensure_installed [:fennel]
+          :sync_install false
+          :highlight {:enable true :additional_vim_regex_highlighting false}
+          :indent {:enable true}}))
+(set vim.opt.foldmethod :expr)
+(set vim.opt.foldexpr "nvim_treesitter#foldexpr()")
+
 ;;; generate help files
 
 ; Load all plugins now.