convert-ly: option to only modify changed files.

convert-ly: option to only modify changed files.

This useful for the regtests -- with the extra -d flag, we will
only change the \version string if the actual contents of the file
has changed.  This lets us see which tests were modified, and
which tests were unchanged since the previous stable release.

[Graham Percival (old account), 2010-10-21 08:09:23]

Pretty simple, but useful.

[Graham Percival (old account), 2010-10-21 08:10:08]

On 2010/10/21 08:09:23, Graham Percival wrote:
> Pretty simple, but useful.

argh, I meant to add: I'm not overly confident about the -d letter, nor the
--diff-version-update name.  Better suggestions are welcome.

[Graham Percival (old account), 2010-10-22 00:38:19]

New patch: it still updates the version for a stable release.

running convert-ly -d -e    on:
  \version "2.11.0"
  { c'4 }
produces:
  \version "2.12.0"
  { c'4 }

which is exactly what we want for the regtests.

[Carl, 2010-10-24 10:50:52]

LGTM.

This is a feature that has been needed.  Thanks for working on it.

Carl

[Graham Percival (old account), 2010-10-25 06:42:26]

On 2010/10/24 10:50:52, Carl wrote:
> LGTM.


Thanks, pushed.