**REGISTER_ACTIONS - REGISTER_FLAGS - REGISTER_ATTRIBUTES**

Every action file must register its actions in the HID.
The action file will have an <code c>#include "hid.h"</code> which define the REGISTER_* macros.
Then somewhere in the file you add:

<code>REGISTER_ACTIONS(exampledo_action_list)</code>
This will be expanded by the preprocessor into:
<code c>
void register_exampledo_action_list()
{ hid_register_actions(exampledo_action_list,1); }
</code>

During the build process the files //**core_lists.h**// and //**gtk_lists.h**// are created. These files contain nothing more than a collection of REGISTER_* instructions it found in its source files.\\ So //**core_lists.h**// and //**gtk_lists.h**// will contain:
<code>REGISTER_ACTION(exampledo_action_list)</code>

In the file //**main.c**// around the __main__ functions we find the instruction:
<code c>#include "dolists.h"</code>
And soon after that we find
<code c>#include "core_lists.h"</code>

Because //**dolists.h**// redefines the REGISTER_* macros, the macros in //**core_lists.h**//
<code>REGISTER_ACTIONS(exampledo_action_list)</code>
will be expanded by the preprocessor into:
<code c>
external void register_exampledo_action_list();
register_exampledo_action_list();
</code>
And therefore it will call all functions to register the actions at the beginning of the main function.

==== Options ====

|REGISTER_ACTIONS|These actions can be called though the user command window (start with ":" in the PCB program.|
|REGISTER_FLAGS|These flags initiate a functions when set or unset.\\ E.g. in file //**flags.c**// we find <code c>HID_Flag flags_flag_list[] = {
  {"style",                FlagCurrentStyle, NULL},
  {"grid",                 FlagGrid,         NULL},</code>The "grid" flags is associated with the menu flag: **View->enable visible grid** and makes the connection to the ''FlagGrid()'' function.\\ If you select **View->enable visible grid** the function ''FlagGrid'' will be called.|
|REGISTER_ATTRIBUTES|In //**main.c**// there is a call to this macro: ''REGISTER_ATTRIBUTES (main_attribute_list)''\\ The main_attribute_list defines the command-line options.\\ Most of the HID also use this macro, to add their command line options as well.|