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Let's say I want my condition to be based on whether or not final gathering is on/off
and I create a global proc to query and return if it's true or false.

Code:

global proc int getFG_orWhatever(){
        
        int $state = `getAttr "miDefaultOptions.finalGather"`;
        return $state;
}

And then create a condition based on that script...

Code:

condition -i -st getFG_orWhatever isFG_enabled;

This is from the help files.

Code:

//    Create a new condition, called "UndoNorRedo", which is true if
//    and only if undo is not available and redo is not available:

global proc int isUndoNorRedo()
{
    return (!`isTrue UndoAvailable` && !`isTrue RedoAvailable`);
}

condition
    -initialize
    -d UndoAvailable
    -d RedoAvailable
    -s "isUndoNorRedo"
    UndoNorRedo;

I don't have any dependency conditions(-d UndoAvailable) which is the problem I think but I can't find the code for UndoAvailable and such to see how they're written.