Tom Lane 511ae628f3 Make psql reject attempts to set special variables to invalid values. ... Previously, if the user set a special variable such as ECHO to an unrecognized value, psql would bleat but store the new value anyway, and then fall back to a default setting for the behavior controlled by the variable. This was agreed to be a not particularly good idea. With this patch, invalid values result in an error message and no change in state. (But this applies only to variables that affect psql's behavior; purely informational variables such as ENCODING can still be set to random values.) To do this, modify the API for psql's assign-hook functions so that they can return an OK/not OK result, and give them the responsibility for printing error messages when they reject a value. Adjust the APIs for ParseVariableBool and ParseVariableNum to support the new behavior conveniently. In passing, document the variable VERSION, which had somehow escaped that. And improve the quite-inadequate commenting in psql/variables.c. Daniel Vérité, reviewed by Rahila Syed, some further tweaking by me Discussion: https://postgr.es/m/7356e741-fa59-4146-a8eb-cf95fd6b21fb@mm		2017-01-30 16:37:26 -05:00
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sgml	Make psql reject attempts to set special variables to invalid values.	2017-01-30 16:37:26 -05:00
Makefile	Remove maintainer-check target, fold into normal build	2013-10-10 20:11:56 -04:00