I would like to be able to programmatically query GnuPG's configured default key
without needing to learn to parse the config file. The obvious way to do that
would be to read the output of:
gpg --with-colons --list-config default-key
but that doesn't work, and default-key isn't including in the raw output of
gpg --with-colons --list-config
either. It should be included if it set.