Aw: Additional accessors via the Extension API ?

[Karsten Hilbert <Karsten.Hilbert@xxxxxxx>]

> Suppose  I have defined an additional type in a PG extension.
> 
> Is it possible to add custom accessors to that type -much like jsonb does- but use an API/hook without touching the core PG grammar & parser? 
> 
> Hypothetical Examples: 
> 
> Assuming I have a TextFile type I’d like to implement syntax like:
> 
> (‘/home/me/a.txt’::TextFile).firstline
> (‘/home/me/a.txt’::TextFile).lastline
> (‘/home/me/a.txt’::TextFile).countlines()
> (‘/home/me/a.txt’::TextFile).size()
> (‘/home/me/a.txt’::TextFile).datemodified()

Off on a tangent but would file_fdw help in any way ?

Karsten