Re: Formatting part of a header property

[David Kastrup]

Thomas Morley <address@hidden> writes:

> Am Mo., 17. Dez. 2018 um 19:21 Uhr schrieb Br. Samuel Springuel
> <address@hidden>:
>>
>> On 2018-12-17 12:08 PM, David Kastrup wrote:
>> > Uh, anything wrong with the obvious
>> >
>> >        custom = \markup { PRAELUDIUM I \italic { italicized text }
>> > Back to normal }
>> >
>> > ?
>> It works in the MWE I posted, but not in my original use case (the
>> contents of the field disappear entirely.  After some further
>> exploration the problem seems to be that I'm making use of
>> `\wordwrap-field` rather than `\fromproperty` (a necessity due to the
>> fact that the contents of this field can get rather long).
>
> \wordwrap-field only works for strings, otherwise an empty stencil is 
> returned.
> Though, there was a bit discussion on devel recently.
> http://lilypond.1069038.n5.nabble.com/Let-wordwrap-field-and-justify-field-take-non-strings-td217729.html
> I then started work on a patch. Up to now not published (still work in
> progress and not sure when I'll have the time to continue).
>
> The idea:
>
> #(define-markup-command (wordwrap-field layout props symbol)
>   (symbol?)
>   #:category align
>   "Wordwrap the data which has been assigned to @var{symbol}.
>
> @lilypond[verbatim,quote]
> \\header {
>   title = \"My title\"
>   myText = \"Lorem ipsum dolor sit amet, consectetur adipisicing
>     elit, sed do eiusmod tempor incididunt ut labore et dolore
>     magna aliqua.  Ut enim ad minim veniam, quis nostrud
>     exercitation ullamco laboris nisi ut aliquip ex ea commodo
>     consequat.\"
> }
>
> \\paper {
>   bookTitleMarkup = \\markup {
>     \\column {
>       \\fill-line { \\fromproperty #'header:title }
>       \\null
>       \\wordwrap-field #'header:myText
>     }
>   }
> }
>
> \\markup {
>   \\null
> }
> @end lilypond"
>   (let* ((m (chain-assoc-get symbol props)))
>     (cond ((string? m)
>            (wordwrap-string-markup layout props m))
>           ((markup-list? m)
>            (wordwrap-markup layout props m))
>           ((markup? m)
>            (interpret-markup layout props m))
>           (else empty-stencil))))
>
>
>
> \book {
>    \paper {
>      indent = 0\mm
>      scoreTitleMarkup = \markup {
>        \fill-line {
>          \null
>          \fontsize #4 \bold \wordwrap-field #'header:piece
>        }
>      }
>    }
>    \header { tagline = ##f }
>    \score {
>      { s1 }
>      \header {
>        piece = \markup { PRAELUDIUM I \italic { italicized text } Back
> to normal }
>      }
>    }
>  }
>
> Seems to work.

Given the original rationale, maybe

       piece = \markuplist { PRAELUDIUM I \italic { italicized text } Back to 
normal }

instead?

BTW, I am not convinced of the string/markup differentiation since a
string _is_ a simple markup.  This is sort of icky.

-- 
David Kastrup