>>>>> In <b4edf9b5-2663-4d5c-981e-ddabca619ad6@well-done.deisui.org> 
>>>>>	Daiki Ueno <ueno@unixuser.org> wrote:
> > Maybe you can finish this code, and I can debug why it doesn't work
> > for a smartcard separately.  It is probably not an important feature.

> The new code mostly finished.

Ok, the attached file is (hopefully) the final version of the new code.
Differences from the previous one are:

- Passphrase caching now works again.
- pgg-gpg-use-agent is abolished.  Add "use-agent" to ~/.gnupg/gpg.conf
  if you want to enable use of gpg-agent, as Miles said.
- Tested with typical cases.  I also attach some test cases I used.