SubGit: use svn.svnCommitMessage option

Just seen this feature in the SubGit 3.2.4 release notes:

Support for svn.gitCommitMessage and svn.svnCommitMessage options that allow specifying message patterns used by SubGit while generating commit messages.

But i cannot find any example on the syntax. I want to do a one time import, so i guess i run

subgit configure SVN_REPO repo.git

then edit repo.git/subgit/config and add gitCommitMessage to the svn section. But what are the variables/placeholders i can use?

Here are the placeholders that can be used:

• %author = Git author (available in both directions)
• %committer = Git committer (available in both directions)
• %date = date of revision or commit (available in both direction)
• %message = original message (available in both direction)
• %note = Git commit note stored at refs/notes/commits (available in Git => SVN direction)
• %note(refs/notes/namespace) = Git commit note stored at refs/notes/namespace (available in Git => SVN direction)
• %commit = Git commit hash (available in Git => SVN direction)
• %svnUser = Subversion username (available in both directions)
• %revision = Subversion revision, GRN in your notation (available in SVN => Git direction)
• %branch = Subversion branch (available in both directions)
• \n = newline feed (available in both directions)

Examples:

[svn]
svnCommitMessage = "%message\n\nr%revision %branch"

or

[svn]
svnCommitMessage = "%message\n%note(refs/notes/test)\n\nr%revision %branch"