fix(preview): update mime-type check for json files (#2221) (#2480)

(cherry picked from commit 89c6767)

lua/telescope/previewers/buffer_previewer.lua

@@ -192,8 +192,8 @@ previewers.file_maker = function(filepath, bufnr, opts)
         if opts.preview.check_mime_type == true and has_file and opts.ft == "" then
           -- avoid SIGABRT in buffer previewer happening with utils.get_os_command_output
           local output = capture(string.format([[file --mime-type -b "%s"]], filepath))
-          local mime_type = vim.split(output, "/")[1]
-          if mime_type ~= "text" and mime_type ~= "inode" then
+          local mime_type = vim.split(output, "/")
+          if mime_type[1] ~= "text" and mime_type[1] ~= "inode" and mime_type[2] ~= "json" then
             if type(opts.preview.mime_hook) == "function" then
               vim.schedule_wrap(opts.preview.mime_hook)(filepath, bufnr, opts)
             else
@@ -206,6 +206,9 @@ previewers.file_maker = function(filepath, bufnr, opts)
             end
             return
           end
+          if mime_type[2] == "json" then
+            opts.ft = "json"
+          end
         end
 
         if opts.preview.filesize_limit then