[Lilypond-auto] Issue 3572 in lilypond: convert-ly should produce several backup files for each invokation

[lilypond]

Status: Accepted
Owner: ----
Labels: Type-Enhancement

New issue 3572 by address@hidden: convert-ly should produce several  
backup files for each invokation
http://code.google.com/p/lilypond/issues/detail?id=3572

Reported by eluze:
http://lists.gnu.org/archive/html/bug-lilypond/2013-09/msg00084.html

it would nice to have a backup in convert-ly which deserves the name.

actually convert-ly does backup the file being converted - but always to the
same file (filename.~ly), and so the original gets quickly lost if you press
the convert button twice.

I fancy a simple rule for this: add an increasing number to the backup file.
this way you can check if a file already exists, if yes-> increase the
number, if no -> backup using this last number.

running convert-ly more than once on the same file would then result in

myFile.~ly.1
myFile.~ly.2
myFile.~ly.3


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