psql: Make \pset without arguments show all settings.

Gilles Darold, reviewed by Pavel Stehule

doc/src/sgml/ref/psql-ref.sgml

@@ -2272,13 +2272,10 @@ lo_import 152801
         </para>
         </tip>
 
-        <note>
         <para>
-        It is an error to call <command>\pset</command> without any
-        arguments. In the future this case might show the current status
+        <command>\pset</command> without any arguments displays the current status
         of all printing options.
         </para>
-        </note>
 
         </listitem>
       </varlistentry>

src/bin/psql/help.c

@@ -247,7 +247,7 @@ slashUsage(unsigned short int pager)
 	fprintf(output, _("  \\f [STRING]            show or set field separator for unaligned query output\n"));
 	fprintf(output, _("  \\H                     toggle HTML output mode (currently %s)\n"),
 			ON(pset.popt.topt.format == PRINT_HTML));
-	fprintf(output, _("  \\pset NAME [VALUE]     set table output option\n"
+	fprintf(output, _("  \\pset [NAME [VALUE]]     set table output option\n"
 					  "                         (NAME := {format|border|expanded|fieldsep|fieldsep_zero|footer|null|\n"
 					  "                         numericlocale|recordsep|recordsep_zero|tuples_only|title|tableattr|pager})\n"));
 	fprintf(output, _("  \\t [on|off]            show only rows (currently %s)\n"),

src/test/regress/expected/psql.out

@@ -52,3 +52,19 @@ more than one row returned for \gset
 select 10 as test01, 20 as test02 from generate_series(1,0) \gset
 no rows returned for \gset
 \unset FETCH_COUNT
+-- show all pset options
+\pset
+Border style (border) is 1.
+Target width (columns) unset.
+Expanded display (expanded) is off.
+Field separator (fieldsep) is "|".
+Default footer (footer) is on.
+Output format (format) is aligned.
+Line style (linestyle) is ascii.
+Null display (null) is "".
+Locale-adjusted numeric output (numericlocale) is off.
+Pager (pager) is used for long output.
+Record separator (recordsep) is <newline>.
+Table attributes (tableattr) unset.
+Title (title) unset.
+Tuples only (tuples_only) is off.

src/test/regress/sql/psql.sql

@@ -37,3 +37,6 @@ select 10 as test01, 20 as test02 from generate_series(1,3) \gset
 select 10 as test01, 20 as test02 from generate_series(1,0) \gset
 
 \unset FETCH_COUNT
+
+-- show all pset options
+\pset