Re: [pbmserv-dev] Adding a command to a game

[Richard Rognlie <rrognlie@gamerz.net>]

On Wed, Sep 21, 2005 at 04:48:33PM -0600, Robert Barrell wrote:
> Hello.
> 
> For my first foray into PBM-related development, I would like to add an 
> SGF function to Go.  I have a test server set up, and have the code 
> almost done, but I am used to using C, AWK, Shell, etc., and not C++, so 
> I have not yet figured out how to get it to work from the go.cpp module 
> (at this point, it is working fine within game.cpp).  Ideally, since the 
> SGF format also supports other games, the best approach would be to:
> 
> * Add an "sgf" comnmand to game.cpp and have it call the SGF function of 
> the game for which it is being run.
> * Add the functioning SGF function to go.cpp for use now.
> * Add SGF functions to the code for existing games, but have them return 
> a "failure" status so that game.cpp could say "The 'sgf' command is not 
> implemented for game %s" but also allow future SGF programmers to add 
> SGF to other games without having to modify game.cpp or game.h (they 
> would only need to have their SGF function return a "success" status).
> 
> Unfortunately, after trying several different things, I have not been 
> able to figure out how to make the function a member of the Go class, 
> then have it called from the command-parsing section of game.cpp.

Define a couple of virtual methods in Game

	Game::ShowSGF()   
Look at the code for Game::ShowAs().

ShowSGF could call doShowSGF... 
	Game::doShowSGF()   

which might be defined as 'sgf format not defined for $GameType'


But then you could override that with Go::doShowSGF()


so... game.cpp does the cmd parsing... and calls ShowSGF().

ShowSGF() runs through the list of arguments to get the boards to display
and for each one, calls doShowSGF() [which is board specific]


Again... much like game.cpp calls ShowAs.... which calls PrintBoardAs
(details are foggy, but you get the idea)



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