Add folding support for JSON files

after/ftplugin/json.vim

@@ -0,0 +1,6 @@
+" let the initial folding state be that all folds are closed.
+set foldlevel=0
+
+" Use nvim-treesitter for folding
+set foldmethod=expr
+set foldexpr=nvim_treesitter#foldexpr()

lua/config/treesitter.lua

@@ -1,5 +1,5 @@
 require("nvim-treesitter.configs").setup {
-  ensure_installed = { "python", "cpp", "lua", "vim" },
+  ensure_installed = { "python", "cpp", "lua", "vim", "json" },
   ignore_install = {}, -- List of parsers to ignore installing
   highlight = {
     enable = true, -- false will disable the whole extension

plugin/command.vim

@@ -45,3 +45,6 @@ function! s:md_to_pdf() abort
     echoerr "Error running command"
   endif
 endfunction
+
+" json format
+command! -range JSONFormat <line1>,<line2>!python -m json.tool