I noticed the 9.1 release notes claim that the new
EDITOR_LINENUMBER_SWITCH thing is an environment variable, whereas it is
actually a psql variable.
This is perhaps sort of a Freudian slip. Since the editor itself is
configured using an environment variable, shouldn't any configuration
about the editor also be an environment variable, so people can
configure them together?
Another thought is that this whole thing could be done away with if we
just allowed people to pass through arbitrary options to the editor,
like
\edit file.sql +50 -a -b -c
For powerusers, this could have interesting possibilities.