[Lilypond-auto] Issue 3993 in lilypond: undocument make-simple-closure

[lilypond]

Status: Accepted
Owner: ----
Labels: Type-Documentation

New issue 3993 by address@hidden: undocument make-simple-closure
http://code.google.com/p/lilypond/issues/detail?id=3993

The example of make-simple-closure at
http://www.lilypond.org/doc/v2.19/Documentation/extending/callback-functions
might become out-dated with the patch for issue 2245

There seems to be no need to document make-simple-closure in 'extending'.

The example could be more simply written as
  \override Grob.X-offset  = #(lambda (g)
     (+ (ly:break-alignable-interface::self-align-callback g)
        (ly:self-alignment-interface::x-aligned-on-self g)))
and an example for a function with a second argument as
  \override Grob.X-offset  = #(lambda (g)
        (ly:side-position-interface::x-aligned-side grob 2.5))

The introduction of make-simple-closure in commit  
9106e3bd374198c5457c35181ae1d66b3ec95236 does not use it from Scheme, but  
uses it in C to generate a Scheme closure.  For the 'extending' guide,  
Scheme's lambda seems better.

In 'define-grobs.scm' anonymous functions (lambdas) are not used in grob  
definitions  
<http://lists.gnu.org/archive/html/lilypond-devel/2013-11/msg00254.html>  
but named functions seem always better than make-simple-closure.

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