[Confuse-devel] config file versions and partial parsing

[Brett Russ]

Hi Martin,

First off, thank you for this excellent time saver you've written!  It 
took a bit of searching to find but well worth it.

I am writing a program in which I've included a version number in my 
config file to allow me to change the format in the future if needed 
(add/move/remove options, etc).  What I originally tried to do was 
similar to the following pseudo code:

opts {
   INT, "config-file-version"
   END
}

cfg = cfg_init()
cfg_parse(cfg, opts)
version = cfg_getint(cfg, "config-file-version")
cfg_free(cfg)

switch (version) {
case 1:
parse_v1();
break;
case 2:
....

and parse_v?() does a new parse, except this time with the complete list 
of options known to be in that version.

So basically, I was hoping for cfg_parse to only harvest the options I 
told it about in opts, which in this case was "config-file-version", and 
ignore everything else.  I found that parse errors were given unless I 
identified everything beforehand.

I think for now I may have to parse for "config-file-version" myself, 
and once I have that number then switch on it and do only one libconfuse 
parse after I know what to expect.

Would this be a feature request you'd consider?  A flag to allow for 
ignoring of all unlisted options?  Or would this be leading down the 
answer given here:
http://lists.gnu.org/archive/html/confuse-devel/2003-09/msg00001.html ?

Either way, thanks again,
Brett