Test code for latest patch set:
```
#(format #t "Three elements (current version 2.19.54):\n> : ~S, >= : ~S\n= :
~S, <= : ~S\n"
(ly:version? > '(2 19 54))
(ly:version? >= 2 19 54)
(ly:version? = 2 19 54)
(ly:version? <= 2 19 54))
#(format #t "Three elements (future version 2.19.57):\n> : ~S, >= : ~S\n= : ~S,
<= : ~S\n"
(ly:version? > '(2 19 57))
(ly:version? >= 2 19 57)
(ly:version? = 2 19 57)
(ly:version? <= 2 19 57))
#(format #t "Three elements (earlier version 2.19.10):\n> : ~S, >= : ~S\n= :
~S, <= : ~S\n"
(ly:version? > '(2 19 10))
(ly:version? >= 2 19 10)
(ly:version? = 2 19 10)
(ly:version? <= 2 19 10))
#(format #t "Two elements (2 19):\n> : ~S, >= : ~S\n= : ~S, <= : ~S\n"
(ly:version? > '(2 19))
(ly:version? >= 2 19)
(ly:version? = 2 19)
(ly:version? <= 2 19))
#(format #t "Two elements (2 18):\n> : ~S, >= : ~S\n= : ~S, <= : ~S\n"
(ly:version? > '(2 18))
(ly:version? >= 2 18)
(ly:version? = 2 18)
(ly:version? <= 2 18))
#(format #t "Two elements (2 20):\n> : ~S, >= : ~S\n= : ~S, <= : ~S\n"
(ly:version? > '(2 20))
(ly:version? >= 2 20)
(ly:version? = 2 20)
(ly:version? <= 2 20))
#(format #t "One element (2):\n> : ~S, >= : ~S\n= : ~S, <= : ~S\n"
(ly:version? > '(2))
(ly:version? >= 2)
(ly:version? = 2)
(ly:version? <= 2))
#(format #t "One element (3):\n> : ~S, >= : ~S\n= : ~S, <= : ~S\n"
(ly:version? > '(3))
(ly:version? >= 3)
(ly:version? = 3)
(ly:version? <= 3))
#(format #t "One element (1):\n> : ~S, >= : ~S\n= : ~S, <= : ~S\n"
(ly:version? > '(1))
(ly:version? >= 1)
(ly:version? = 1)
(ly:version? <= 1))
```
---
** [issues:#5067] Add lilypond version predicates/operators**
**Status:** Started
**Created:** Fri Feb 10, 2017 08:04 AM UTC by Urs Liska
**Last Updated:** Wed Feb 15, 2017 07:54 AM UTC
**Owner:** Urs Liska
Add lilypond version predicates/operators
This set of predicates/operators compares a given reference version
to the LilyPond version that is currently being executed.
This makes it possible to implement "version switches" to write
(library) code that is compatible over syntax changes.
NOTE: I'm not sure where (and if) this should be documented.
Please make suggestions
http://codereview.appspot.com/317270043
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