Re: Altering page numbers

[Lukas-Fabian Moser]

Hi David,

> I have several pages of introductory and performance notes in the score
> I am currently working on, followed by about 150 pages of score.  I
> should like to have the pages before the actual score numbered in lower
> case Roman numerals, followed by the score pages numbered in Arabic
> numerals starting at 1.  But I cannot find any way to do this.

One can write a function that chooses the right format of the page 
number depending on where we are in the score. In the following solution 
, one has to define (beforehand) how many pages are to be considered 
"introduction", but I think this is not too nasty.

\version "2.19"

introductionLengh = 3

#(define-markup-command (makePageNumber layout props) ()
   (let* ((page (chain-assoc-get 'page:page-number props -1))
          (romanize? (< page 1))
          (effective-page (if romanize? (+ page introductionLengh) page))
          (effective-page-string (if romanize?
                                     (if (positive? effective-page) ; 
needed for 2.21 for some reason
                                         (string-downcase (fancy-format 
#f "address@hidden" effective-page))
                                         "")
                                     (number->string effective-page)
                                     )))
     (interpret-markup layout props effective-page-string)))

\book {
  \paper {
    first-page-number = #(- 1 introductionLengh)
    print-page-number = ##t
    print-first-page-number = ##t
    oddHeaderMarkup = \markup \null
    evenHeaderMarkup = \markup \null
    oddFooterMarkup = \markup { \fill-line { \makePageNumber } }
    evenFooterMarkup = \oddFooterMarkup
  }
  \score { \new Staff { s1 } } \pageBreak
  \score { \new Staff { s1 } } \pageBreak
  \score { \new Staff { s1 } } \pageBreak
  \score { \new Staff { s1 } } \pageBreak
  \score { \new Staff { s1 } } \pageBreak
  \score { \new Staff { s1 } } \pageBreak
  \score { \new Staff { s1 } } \pageBreak
  \score { \new Staff { s1 } } \pageBreak
}


Probably the coding style is not good because I bypass using 
\fromproperty etc. which I do not quite understand. But at least it 
works ;-). But I expect this is the reason I need an extra check for 
2.21 - here the function is sometimes called with an effective page 
number of 0, causing an error when trying to turn this into a Roman number.

Best
Lukas