anchor.diff:  :hook global WinCreate .*\.cc %{ addhl number_lines }
   -----------------------------------------------------
   
  +existing hooks are:
  +
  + * +NormalIdle+: A certain duration has passed since last key was pressed in
  +       normal mode.
  + * +NormalBegin+: Entering normal mode
  + * +NormalEnd+: Leaving normal mode
  + * +NormalKey+: A key is received in normal mode, the key is used for filtering
  + * +InsertIdle+: A certain duration has passed since last key was pressed in
  +       insert mode.
  + * +InsertBegin+: Entering insert mode
  + * +InsertEnd+: Leaving insert mode
  + * +InsertKey+: A key is received in insert mode, the key is used for filtering
  + * +InsertMove+: The cursor moved (without inserting) in insert mode, the key
  +       that triggered the move is used for filtering
  + * +WinCreate+: A window was created
  + * +WinSetOption+: An option was set in a window context, the filtering text
  +       is '<option_name>=<new_value>'
  + * +BufNew+: A buffer for a new file has been created, filename is used for
  +       filtering
  + * +BufOpen+: A buffer for an existing file has been created, filename is
  +       used for filtering
  + * +BufCreate+: A buffer has been created, filename is used for filtering
  + * +RuntimeError+: an error was encountered while executing an user command
  +       the error message is used for filtering
  +
  +when not specified, the filtering text is an empty string.
  +
   Shell expansion
   ---------------
   
  
positive.code:  * +kak_reg_<r>+: value of register <r>
   * +kak_socket+: filename of session socket (/tmp/kak-<session>)
   * +kak_client+: name of current client
   * +kak_cursor_line+: line of the end of the last selection
   * +kak_cursor_cursor+: cursor of the end of the last selection
  
  for example you can print informations on the current file in the status
  line using:
  
negative.code: 
  registers are named list of text. They are used for various purpose, like
  storing the last yanked test, or the captures groups associated with the
  selections.
  
  While in insert mode, ctrl-r followed by a register name (one character)
  inserts it.
  