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psql: add \dconfig command to show server's configuration parameters.

Browse Source 
Plain \dconfig is basically equivalent to SHOW except that you can
give it a pattern with wildcards, either to match multiple GUCs or
because you don't exactly remember the name you want.

\dconfig+ adds type, context, and access-privilege information,
mainly because every other kind of object privilege has a psql command
to show it, so GUC privileges should too.  (A form of this command was
in some versions of the patch series leading up to commit a0ffa885e.
We pulled it out then because of doubts that the design and code were
up to snuff, but I think subsequent work has resolved that.)

In passing, fix incorrect completion of GUC names in GRANT/REVOKE
ON PARAMETER: a0ffa885e neglected to use the VERBATIM form of
COMPLETE_WITH_QUERY, so it misbehaved for custom (qualified) GUC
names.

Mark Dilger and Tom Lane

Discussion: https://postgr.es/m/3118455.1649267333@sss.pgh.pa.us
This commit is contained in:
Tom Lane
2022-04-07 17:09:44 -04:00
parent 16acf7f1aa
commit 3e707fbb40
10 changed files with 127 additions and 6 deletions
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3
src/bin/psql/help.c
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@@ -166,7 +166,7 @@ slashUsage(unsigned short int pager)
* Use "psql --help=commands | wc" to count correctly. It's okay to count
* the USE_READLINE line even in builds without that.
*/
output = PageOutput(137, pager ? &(pset.popt.topt) : NULL);
output = PageOutput(138, pager ? &(pset.popt.topt) : NULL);
fprintf(output, _("General\n"));
fprintf(output, _(" \\copyright show PostgreSQL usage and distribution terms\n"));
@@ -231,6 +231,7 @@ slashUsage(unsigned short int pager)
fprintf(output, _(" \\dAp[+] [AMPTRN [OPFPTRN]] list support functions of operator families\n"));
fprintf(output, _(" \\db[+] [PATTERN] list tablespaces\n"));
fprintf(output, _(" \\dc[S+] [PATTERN] list conversions\n"));
fprintf(output, _(" \\dconfig[+] [PATTERN] list configuration parameters\n"));
fprintf(output, _(" \\dC[+] [PATTERN] list casts\n"));
fprintf(output, _(" \\dd[S] [PATTERN] show object descriptions not displayed elsewhere\n"));
fprintf(output, _(" \\dD[S+] [PATTERN] list domains\n"));