code/__DEFINES/reskin.dm

APPLY_VAR_OR_RESET_INITIAL	Sets the atom's varname to newvalue if newvalue is not null, otherwise resets it to its initial value if resetcondition is true
APPLY_VAR_OR_RESET_TO	Sets the atom's varname to newvalue if newvalue is not null, otherwise sets it to resetvalue if resetcondition is true
RESET_INITIAL_IF_SET	Resets the atom's varname to its initial value if oldvalue is not null
RESET_TO_IF_SET	Sets the atom's varname to resetvalue if oldvalue is not null

Define Details

Sets the atom's varname to newvalue if newvalue is not null, otherwise resets it to its initial value if resetcondition is true

Sets the atom's varname to newvalue if newvalue is not null, otherwise sets it to resetvalue if resetcondition is true

Resets the atom's varname to its initial value if oldvalue is not null

Sets the atom's varname to resetvalue if oldvalue is not null