Kieren MacMillan <kieren_macmil...@sympatico.ca> writes: > Hi David, > > Thank you for the helpful reply and documentation/explanation. > >> -- Function: ly:chain-assoc-get key achain default-value >> strict-checking >> Return value for KEY from a list of alists ACHAIN. If no entry is >> found, return DEFAULT-VALUE or â#fâ if DEFAULT-VALUE is not >> specified. [...] >> >> DEFAULT-VALUE is specified as markp, and a markup is never #f. So your >> condition is always true when the specified KEY cannot be found. > > So how could I code the when-property function so that it is false > when the KEY cannot be found?
By not specifying a default value? I have absolutely no idea why you put `markp' as the default-value of your call to ly:chain-assoc-get. It does not serve any purpose conceivable to me, particularly since you are only planning to use its value when finding the key, and the purpose of the default-value is to be substituted when _not_ finding the key. -- David Kastrup _______________________________________________ lilypond-user mailing list lilypond-user@gnu.org https://lists.gnu.org/mailman/listinfo/lilypond-user
