switch packer for pckr, fix indent-blankline and code folding

.config/nvim/after/plugin/treesitter.lua

@@ -1,6 +1,6 @@
 require'nvim-treesitter.configs'.setup {
   -- A list of parser names, or "all" (the five listed parsers should always be installed)
-  ensure_installed = { "bash", "c", "cpp", "cuda", "latex", "lua", "markdown", "rust", "vim", "vimdoc" },
+  ensure_installed = { "bash", "c", "cpp", "cuda", "latex", "lua", "markdown", "python", "rust", "vim", "vimdoc" },
 
   -- Install parsers synchronously (only applied to `ensure_installed`)
   sync_install = false,
@@ -24,33 +24,17 @@ require'nvim-treesitter.configs'.setup {
   },
 }
 local vim = vim
-local opt = vim.opt
-local api = vim.api
-local M = {}
 
-opt.foldmethod = "expr"
-opt.foldexpr = "nvim_treesitter#foldexpr()"
-
--- function to create a list of commands and convert them to autocommands
--------- This function is taken from https://github.com/norcalli/nvim_utils
-function M.nvim_create_augroups(definitions)
-    for group_name, definition in pairs(definitions) do
-        api.nvim_command('augroup '..group_name)
-        api.nvim_command('autocmd!')
-        for _, def in ipairs(definition) do
-            local command = table.concat(vim.tbl_flatten{'autocmd', def}, ' ')
-            api.nvim_command(command)
+vim.o.foldmethod = 'expr'
+-- Default to treesitter folding
+vim.o.foldexpr = 'v:lua.vim.treesitter.foldexpr()'
+-- Prefer LSP folding if client supports it
+vim.api.nvim_create_autocmd('LspAttach', {
+    callback = function(args)
+    local client = vim.lsp.get_client_by_id(args.data.client_id)
+    if client:supports_method('textDocument/foldingRange') then
+            local win = vim.api.nvim_get_current_win()
+            vim.wo[win][0].foldexpr = 'v:lua.vim.lsp.foldexpr()'
         end
-        api.nvim_command('augroup END')
-    end
-end
-
-
-local autoCommands = {
-    -- other autocommands
-    open_folds = {
-        {"BufReadPost,FileReadPost", "*", "normal zR"}
-    }
-}
-
-M.nvim_create_augroups(autoCommands)
+    end,
+})