filter questions

[Kevin Fenzi]

Greetings. 

I took a look at the filters in the recent 0.10 release and had a few
minor questions. ;) 

First, the email-gravatar.lua script seems to require luacrypto? 
( http://luacrypto.luaforge.net/ ) This is pretty ancient and not
packaged in Fedora at least. Is there some other more supportable
library that could be used?

lua-md5 seems better if you just need a md5? 
http://www.keplerproject.org/md5/

Also, would it be possible to optionally use libravatar? They are free
software, where gravatar is not. ;( 
http://wiki.libravatar.org/description/

Next, the email-gravatar.py script requires python3? 
Would it be possible to also have a python2 compatible version? Older
systems are still not using python3. 

Finally the highlight script has 2 different calls for version2 or 3 of
highlight. Perhaps we could move that to a build time check? Or even a
runtime one? or just split them into 2 scripts? 

Thanks for all your work, cgit is great!

kevin
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