'%GF':: show the fingerprint of the key used to sign a signed commit
'%GP':: show the fingerprint of the primary key whose subkey was used
to sign a signed commit
+'%GT':: show the trust level for the key used to sign a signed commit
'%gD':: reflog selector, e.g., `refs/stash@{1}` or `refs/stash@{2
minutes ago}`; the format follows the rules described for the
`-g` option. The portion before the `@` is the refname as