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.

However, the version string will still be updated to match the
last stable release.

diff --git a/scripts/convert-ly.py b/scripts/convert-ly.py
index a1f126f29093265e5d3d3a74225b699e423ddd3b..3c447b915751be42c4b40977365b1d5419237093 100644 (file)
--- a/scripts/convert-ly.py
+++ b/scripts/convert-ly.py
@@ -118,6 +118,12 @@ def get_option_parser ():
               action='store_true',
               dest='force_current_version',
               default=False)
+
+    p.add_option ('-d', '--diff-version-update',
+              help=_ ("only update \\version number if file is modified"),
+              action='store_true',
+              dest='diff_version_update',
+              default=False)
     
     p.add_option ("-s", '--show-rules',
               help=_ ("show rules [default: -f 0, -t %s]") % program_version,
@@ -250,6 +256,16 @@ def do_one_file (infile_name):
         if global_options.force_current_version and last == to_version:
             last = str_to_tuple (program_version)
 
+        if global_options.diff_version_update:
+            if result == input:
+                # check the y in x.y.z  (minor version number)
+                if last[0:2] != from_version[0:2]:
+                    # previous stable version
+                    last = (last[0], 2*(last[1]/2), 0)
+                else:
+                    # make no (actual) change to the version number
+                    last = from_version
+
         newversion = r'\version "%s"' % tup_to_str (last)
         if lilypond_version_re.search (result):
             result = re.sub (lilypond_version_re_str,