It turned out to be very doable, despite epiphany’s extension API lacking Vala bindings (Cosimo Cecchi, I’m looking at you ). Basically I did the following setup:

1. Add the extension following the instructions in Writing Epiphany Extensions by Adam Hooper.
2. Add a check for valac in configure.ac.
3. Add a rule in the extension’s Makefile.am to generate a C header file for all the Vala code, for use from C.

Then I started writing the actual extension. I did the minimal amount of work in C, trying to escape as soon as possible into Vala. In the few places I needed to call from Vala into C I would declare a delegate in Vala, and pass a function from Cⁱ.

I call this new version BMS, for bookmark synchronisation. I have a patch for BMS that applies to epiphany 2.28.1. (The file also contain a PKGBUILD in order to delight Arch users )

I should probably point out that while epilicious never could be called polished, BMS is even less so. I might find the time to make it multi-threaded, so that it’s possible to do some sort of progress dialogue, but don’t hold your breath. In the back of my mind is also the thought of rewriting it yet again, in JavaScript/seed.

More »

1. The format of .vapi files are unknown to me, and I haven’t managed to find much documentation. Using function pointers seemed like an easier way, especially given that I needed this in exactly 3 places.