Proof of concept − KIO mail://

[Pierre]

Hi

A few weeks ago, I noticed I spent a lot of time juggling between KMail and 
the other applications, searching for attachments that I did not save locally… 
or trying to attach a file to an email only to find out that I did not save it 
and it was only available as another attachment.
So I figured out that a mail:// KIO would be quite nice for these usecases : 
from okular, I could open PDFs from sent or received emails, from KMail I 
could attach a file from another email… After a few days of hacking, here is a 
proof of concept :

https://cgit.kde.org/scratch/ducroquet/kiomail.git/

If you are brave enough to install and try it, don't forget when running 
CMake :
cmake -DCMAKE_INSTALL_PREFIX=/usr -DKDE_INSTALL_USE_QT_SYS_PATHS=TRUE ..

And after make install, restart kdeinit5 (simply type the kdeinit5 command).
You can then open «mail:/» in dolphin or whatever to browse your email 
attachments.

If you think this has any possible interest for users, I would gladly help 
evolve this from PoC to real code…

 Pierre
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