See the hmail.el file which offers a straightforward abstract interface for connecting mail reader and sender formats.  Make your own maildir: functions that that are then mapped to the hmail abstract interface via the rmail:init function in that same file and then Hyperbole should take care of the rest including letting you link to your messages.

We can provide pointers if you work on this.  It is a medium-difficulty project.

Bob

On Mon, Aug 5, 2019 at 9:22 PM Jean Louis <bugs@gnu.support> wrote:

I use: Editor: GNU Emacs 27.0.50 (build 3, x86_64-pc-linux-gnu, X toolkit, Xaw3d scroll bars)

Hyperbole: 7.0.3
Sys Type: x86_64-pc-linux-gnu
OS Type: gnu/linux
Window Sys: x
News Reader: Gnus v5.13

I hope you know what are maildir messages. Each message is for itself
within a maildir folder. I know that Emacs can display such messages.

'link-to-mail'
Displays a mail message with MAIL-MSG-ID from optional MAIL-FILE.
See the documentation for the variable 'hmail:init-function' for
information on how to specify the mail reader to use.

MAIL-MSG-ID is not necessary for maildir messages, as it is almost
same as link to file, the difference would be that some headers could
be hidden and message or mail mode would be turned on. Messages could
be replied, forwarded, etc.

Maybe some action can be used for maildirs, just skipping the
MAIL-MSG-ID. But it somehow need to know if it is maildir link by
asking the user.

Jean

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