Method getBuildingIfValidOrRemoveIfNot

plugins/buildingplan/plannedbuilding.cpp:122–131

Ensure the building still exists and is in a valid state. It can disappear for lots of reasons, such as running the game with the buildingplan plugin disabled, manually removing the building, modifying it via the API, etc.

// for lots of reasons, such as running the game with the buildingplan plugin
// disabled, manually removing the building, modifying it via the API, etc.
df::building * PlannedBuilding::getBuildingIfValidOrRemoveIfNot(color_ostream &out, bool skip_remove) {
    auto bld = df::building::find(id);
    bool valid = bld && bld->getBuildStage() == 0;
    if (!valid) {
        if (!skip_remove)
            remove(out);
        return NULL;
    }
    return bld;
}