anchor.diff:  
   Some of kakoune state is available through environment variables:
   
  - * +kak_selection+: content of the last selection
  + * +kak_selection+: content of the main selection
    * +kak_bufname+: name of the current buffer
    * +kak_timestamp+: timestamp of the current buffer, the timestamp is an
          integer value which is incremented each time the buffer is modified.
  
positive.code: :hook global WinCreate .*\.cc %{ addhl number_lines }
  -----------------------------------------------------
  
  Shell expansion
  ---------------
  
  
negative.code:  * _?_: search (extend to next match)
   * _n_: select next match
   * _N_: add a new selection with next match
   * _alt-n_: replace main selection with next match (preserving the others)
  
   * _alt-c_: center main selection in current window
   * _pageup_: scroll up
   * _pagedown_: scroll down
  
  