I'm trying to create a new lecture environment starting from the base section. I'd like its title to be `Lecture <number>: <title>` if a title is provided, and `Lecture <number>` if it isn't. This title should also be reported in the left footer and in the table of contents. This is the code I have so far: ``` \definehead [lecture] [section] \setuphead [lecture] [ command=\Lecture, style=\bfc, ] \setuplabeltext [lecture={Lecture}] \define[2]\Lecture{\ctxlua{ userdata.format_lecture_title({ label = context.labeltext('lecture'), number = [==[#1]==], title = [==[#2]==], }) }} \setupfootertexts [\ctxlua{ userdata.format_lecture_title({ label = context.labeltext('lecture'), number = context.getmarking({'lecturenumber'}), title = context.getmarking({'lecture'}), }) }] [pagenumber] \startluacode userdata = userdata or {} function userdata.format_lecture_title(args) if args.title and args.title ~= '' then context('%s %s: %s', args.label, args.number, args.title) else context('%s %s', args.label, args.number) end end \stopluacode \setupcombinedlist [content] [list={lecture}] \setuplist [lecture] [ alternative=c, command=\Lecture, % this seems to have no effect? ] \starttext \completecontent % Both title and left footer should be 'Lecture 1: Foo' \startlecture [title={Foo}] Foo bar baz \stoplecture \page % Both title and left footer should be 'Lecture 2' \startlecture [] Foo bar baz \stoplecture \stoptext ``` Unfortunately none of them are reported correctly. The title in the body is formatted simply as `Lecture`, the one in the left footer is formatted as `Lecture<number><title>`, and the one in the table of contents isn't affected at all. What am I doing wrong?