Custom homing - distance coded glass scales

Hello

(Third try posting this, there's something wrong with the forum server)

I'm retrofitting a Cincinnati Arrow which does not have any kind of homing or limit switches on x and y -axis. Glass scales have distance coded index marks though and I would like to use them for homing. I found one successful attempt doing so: 
forum.linuxcnc.org/12-milling/42195-retr...ing-success?start=50

Editing hm2 similarly shouldn't be too difficult but homing.c looks completely different nowadays. Should this kind of thing be done with homecomp? Any advice on that would be welcome, my coding skills are slightly limited and there is not too many examples of homecomp yet.

Thanks
Ossi

Homing on glass scale index is supported directly by Linuxcnc and Mesa's products.
linuxcnc.org/docs/html/config/ini-homing.html#_home_use_index but the whole page is worthwhile reading.

Yes of course but distance coded indexes are not as far as I know? (The distance between index marks varies and the distance is used to calculate absolute position)

My linear scales have index every 50 mm and that works.
That's not really what you are looking for I now understand.