DBIXS_REVISION from git instead of svn

The svn version was "static" as in "dead" as of the move to git.
Don't know if the new situation really adds value, but at least
it now has more value than the previous version

dbixs_rev.h

@@ -1,3 +1,2 @@
-/* Fri Jul 13 13:32:02 2012 */
-/* Mixed revision working copy (15349:15353) */
-#define DBIXS_REVISION 15349
+/* Fri Jan 17 15:09:59 2025 */
+#define DBIXS_REVISION 1698

dbixs_rev.pl

@@ -5,49 +5,26 @@
 
 my $dbixs_rev_file = "dbixs_rev.h";
 
-my $is_make_dist;
-my $svnversion;
-
-if (is_dbi_svn_dir(".")) {
-    $svnversion = `svnversion -n`;
-}
-elsif (is_dbi_svn_dir("..")) {
-    # presumably we're in a subdirectory because the user is doing a 'make dist'
-    $svnversion = `svnversion -n ..`;
-    $is_make_dist = 1;
-}
-else {
-    # presumably we're being run by an end-user because their file timestamps
-    # got messed up
-    print "Skipping regeneration of $dbixs_rev_file\n";
-    utime(time(), time(), $dbixs_rev_file); # update modification time
+sub skip_update {
+    my $reason = shift;
+    print "Skipping regeneration of $dbixs_rev_file: ", $reason, "\n";
+    utime (time (), time (), $dbixs_rev_file); # update modification time
     exit 0;
-}
-
-my @warn;
-die "Neither current directory nor parent directory are an svn working copy\n"
-    unless $svnversion and $svnversion =~ m/^\d+/;
-push @warn, "Mixed revision working copy ($svnversion:$1)"
-    if $svnversion =~ s/:(\d+)//;
-push @warn, "Code modified since last checkin"
-    if $svnversion =~ s/[MS]+$//;
-warn "$dbixs_rev_file warning: $_\n" for @warn;
-die "$0 failed\n" if $is_make_dist && @warn;
-
-write_header($dbixs_rev_file, DBIXS_REVISION => $svnversion, \@warn);
-
-sub write_header {
-    my ($file, $macro, $version, $comments_ref) = @_;
-    open my $fh, ">$file" or die "Can't open $file: $!\n";
-    unshift @$comments_ref, scalar localtime(time);
-    print $fh "/* $_ */\n" for @$comments_ref;
-    print $fh "#define $macro $version\n";
-    close $fh or die "Error closing $file: $!\n";
-    print "Wrote $macro $version to $file\n";
-}
-
-sub is_dbi_svn_dir {
-    my ($dir) = @_;
-    return (-d "$dir/.svn" && -f "$dir/MANIFEST.SKIP");
-}
+    } # skip_update
 
+-d ".git" or skip_update ("No git env");
+
+my @n = eval { qx{git log --pretty=oneline} };
+@n or skip_update ("Git log was empty");
+
+open my $fh, ">$dbixs_rev_file" or die "Can't open $dbixs_rev_file: $!\n";
+print $fh "/* ", scalar localtime, " */\n";
+
+chomp (my @st = qx{git status -s --show-stash});
+print $fh "/* $_ */\n" for grep { !m/\b$dbixs_rev_file\b/ } @st;
+
+my $def = "DBIXS_REVISION";
+my $rev = scalar @n;
+print $fh "#define $def $rev\n";
+close $fh or die "Error closing $dbixs_rev_file: $!\n";
+print "Wrote $def $rev to $dbixs_rev_file\n";