Re: [HACKERS] \if, \elseif, \else, \endif (was Re: PSQL commands:\quit_if, \quit_unless)

Hello Corey,

> v20: attempt at implementing the switch-on-all-states style.

For the elif I think it is both simpler and better like that. Whether 
committer will agree is an unkown, as always.

For endif, I really exagerated, "switch { defaut: " is too much, please 
accept my apology. Maybe just do the pop & error reporting?

For if, the evaluation & error could be moved before the switch, which may 
contain only the new state setting decision, and the push after the 
switch? Also, I would suggest to use default only to detect an unexpected 
state error, and list all other states explicitely.

-- 
Fabien.