The all directory "akonadi" is tested for all rules of the coding style.
But of the qsqlite subdirectory which contains a .no_coding_style file.

The rules and all the scripts are free for download and comments at:
  https://community.kde.org/Policies/Kdepim_Coding_Style

Feel free to communicate any comments or/and bugs:
  guy dot maurel at kde dot org
