Doc: Extending: fix typo

[lilypond.git] / Documentation / extending / programming-interface.itely

diff --git a/Documentation/extending/programming-interface.itely b/Documentation/extending/programming-interface.itely
index 4bae49aa4a62ba75e9dba5d2c6f710822684f43f..7d2949ff11c256c795ac45dc97a3f3328f8f5b18 100644 (file)
--- a/Documentation/extending/programming-interface.itely
+++ b/Documentation/extending/programming-interface.itely
@@ -4,7 +4,8 @@
     Translation of GIT committish: FILL-IN-HEAD-COMMITTISH
 
     When revising a translation, copy the HEAD committish of the
-    version that you are working on.  See TRANSLATION for details.
+    version that you are working on.  For details, see the Contributors'
+    Guide, node Updating translation committishes..
 @end ignore
 
 @c \version "2.12.0"
@@ -598,7 +599,7 @@ and the text. So we will introduce a new property,
 @code{box-padding} will be used for the inner padding.  The new code is
 now as follows:
 
-@lisp 
+@lisp
 #(define-markup-command (double-box layout props text) (markup?)
   #:properties ((inter-box-padding 0.4)
                 (box-padding 0.6))
@@ -682,7 +683,7 @@ Then, a property for setting the gap between two lines is added, called
 @lisp
 (define-markup-command (draw-double-line layout props dest)
   (number-pair?)
-  #:properties ((thickness 1) 
+  #:properties ((thickness 1)
                 (line-gap 0.6))
   "..documentation.."
   ...
@@ -694,8 +695,8 @@ stencils are combined using @code{ly:stencil-add}:
 
 @lilypond[quote,verbatim,ragged-right]
 #(define-markup-command (my-draw-line layout props dest)
-  (number-pair?) 
-  #:properties ((thickness 1) 
+  (number-pair?)
+  #:properties ((thickness 1)
                 (line-gap 0.6))
   "..documentation.."
   (let* ((th (* (ly:output-def-lookup layout 'line-thickness)
@@ -894,7 +895,7 @@ can be inserted with a grob closure.  Here is a setting from
 @code{AccidentalSuggestion},
 
 @example
-(X-offset .
+`(X-offset .
   ,(ly:make-simple-closure
     `(,+
         ,(ly:make-simple-closure
@@ -921,6 +922,13 @@ The inner @code{ly:make-simple-closure} supplies the grob as argument
 to @var{proc}, the outer ensures that result of the function is
 returned, rather than the @code{simple-closure} object.
 
+From within a callback, the easiest method for evaluating a markup is
+to use grob-interpret-markup.  For example:
+
+@example
+my-callback = #(lambda (grob)
+                 (grob-interpret-markup grob (markup "foo")))
+@end example
 
 @node Inline Scheme code
 @section Inline Scheme code