Apply the proper version of Christopher Kings-Lynne's describe patch

(ie, the one with describe-schema support).  Minor code review.
Adjust display of casts to use standard type names.

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

 <!--
-$Header: /cvsroot/pgsql/doc/src/sgml/ref/psql-ref.sgml,v 1.83 2003/01/07 18:46:52 momjian Exp $
+$Header: /cvsroot/pgsql/doc/src/sgml/ref/psql-ref.sgml,v 1.84 2003/01/07 20:56:06 tgl Exp $
 PostgreSQL documentation
 -->
 
@@ -798,6 +798,30 @@ testdb=>
         </listitem>
       </varlistentry>
 
+
+      <varlistentry>
+        <term><literal>\dc</literal> [ <replaceable class="parameter">pattern</replaceable> ]</term>
+        <listitem>
+        <para>
+        Lists all available conversions between character-set encodings.
+	If <replaceable class="parameter">pattern</replaceable>
+        is specified, only conversions whose name matches the pattern are
+	listed.
+        </para>
+        </listitem>
+      </varlistentry>
+
+
+      <varlistentry>
+        <term><literal>\dC</literal></term>
+        <listitem>
+        <para>
+        Lists all available type casts.
+        </para>
+        </listitem>
+      </varlistentry>
+
+
       <varlistentry>
         <term><literal>\dd</literal> [ <replaceable class="parameter">pattern</replaceable> ]</term>
         <listitem>
@@ -847,29 +871,6 @@ testdb=>
       </varlistentry>
 
 
-      <varlistentry>
-        <term><literal>\dc</literal> [ <replaceable class="parameter">pattern</replaceable> ]</term>
-        <listitem>
-        <para>
-        Lists all available conversions (between encodings). If <replaceable
-        class="parameter">pattern</replaceable>
-        is specified, only matching conversions are shown.
-        </para>
-        </listitem>
-      </varlistentry>
-
-
-      <varlistentry>
-        <term><literal>\dC</literal></term>
-        <listitem>
-        <para>
-        Lists all available type casts.  Casts can be explicit, explicit and assignment
-	or implicit, and are used to change a variable from one type to another.
-        </para>
-        </listitem>
-      </varlistentry>
-
-
       <varlistentry>
         <term><literal>\df [ <replaceable class="parameter">pattern</replaceable> ]</literal></term>
 
@@ -929,6 +930,19 @@ testdb=>
       </varlistentry>
 
 
+      <varlistentry>
+        <term><literal>\dn</literal> [ <replaceable class="parameter">pattern</replaceable> ]</term>
+
+        <listitem>
+        <para>
+        Lists all available schemas (namespaces). If <replaceable
+        class="parameter">pattern</replaceable> (a regular expression)
+        is specified, only schemas whose name matches the pattern are listed.
+        </para>
+        </listitem>
+      </varlistentry>
+
+
       <varlistentry>
         <term><literal>\do [ <replaceable class="parameter">pattern</replaceable> ]</literal></term>
         <listitem>
@@ -1054,8 +1068,9 @@ Tue Oct 26 21:40:57 CEST 1999
         </para>
 	<note>
 	<para>
-	This command does not see changes made by <command>SET
-        CLIENT_ENCODING</>.
+	This command will not notice changes made directly by <command>SET
+        CLIENT_ENCODING</>.  If you use <literal>\encoding</literal>,
+	be sure to use it to set as well as examine the encoding.
 	</para>
 	</note>	
         </listitem>

src/backend/catalog/namespace.c

@@ -13,7 +13,7 @@
  * Portions Copyright (c) 1994, Regents of the University of California
  *
  * IDENTIFICATION
- *	  $Header: /cvsroot/pgsql/src/backend/catalog/namespace.c,v 1.42 2002/12/12 21:02:19 momjian Exp $
+ *	  $Header: /cvsroot/pgsql/src/backend/catalog/namespace.c,v 1.43 2003/01/07 20:56:06 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -145,6 +145,7 @@ Datum		pg_operator_is_visible(PG_FUNCTION_ARGS);
 Datum		pg_opclass_is_visible(PG_FUNCTION_ARGS);
 Datum		pg_conversion_is_visible(PG_FUNCTION_ARGS);
 
+
 /*
  * RangeVarGetRelid
  *		Given a RangeVar describing an existing relation,
@@ -1084,7 +1085,7 @@ ConversionIsVisible(Oid conid)
 							ObjectIdGetDatum(conid),
 							0, 0, 0);
 	if (!HeapTupleIsValid(contup))
-		elog(ERROR, "Cache lookup failed for converions %u", conid);
+		elog(ERROR, "Cache lookup failed for conversion %u", conid);
 	conform = (Form_pg_conversion) GETSTRUCT(contup);
 
 	recomputeNamespacePath();
@@ -1104,7 +1105,7 @@ ConversionIsVisible(Oid conid)
 		 * If it is in the path, it might still not be visible; it could
 		 * be hidden by another conversion of the same name earlier in the
 		 * path. So we must do a slow check to see if this conversion would
-		 * be found by ConvnameGetConid.
+		 * be found by ConversionGetConid.
 		 */
 		char	   *conname = NameStr(conform->conname);
 		

src/bin/psql/command.c

@@ -3,7 +3,7 @@
  *
  * Copyright 2000-2002 by PostgreSQL Global Development Group
  *
- * $Header: /cvsroot/pgsql/src/bin/psql/command.c,v 1.86 2002/12/12 21:02:21 momjian Exp $
+ * $Header: /cvsroot/pgsql/src/bin/psql/command.c,v 1.87 2003/01/07 20:56:06 tgl Exp $
  */
 #include "postgres_fe.h"
 #include "command.h"
@@ -350,15 +350,27 @@ exec_command(const char *cmd,
 			case 'a':
 				success = describeAggregates(pattern, show_verbose);
 				break;
+			case 'c':
+				success = listConversions(pattern);
+				break;
+			case 'C':
+				success = listCasts(pattern);
+				break;
 			case 'd':
 				success = objectDescription(pattern);
 				break;
+			case 'D':
+				success = listDomains(pattern);
+				break;
 			case 'f':
 				success = describeFunctions(pattern, show_verbose);
 				break;
 			case 'l':
 				success = do_lo_list();
 				break;
+			case 'n':
+				success = listSchemas(pattern);
+				break;
 			case 'o':
 				success = describeOperators(pattern);
 				break;
@@ -378,16 +390,7 @@ exec_command(const char *cmd,
 			case 'u':
 				success = describeUsers(pattern);
 				break;
-			case 'D':
-				success = listDomains(pattern);
-				break;
-			case 'c':
-				success = listConversions(pattern);
-				break;
-			case 'C':
-				success = listCasts(pattern);
-				break;
-				
+
 			default:
 				status = CMD_UNKNOWN;
 		}

src/bin/psql/describe.c

@@ -3,7 +3,7 @@
  *
  * Copyright 2000-2002 by PostgreSQL Global Development Group
  *
- * $Header: /cvsroot/pgsql/src/bin/psql/describe.c,v 1.73 2002/12/21 01:07:07 tgl Exp $
+ * $Header: /cvsroot/pgsql/src/bin/psql/describe.c,v 1.74 2003/01/07 20:56:06 tgl Exp $
  */
 #include "postgres_fe.h"
 #include "describe.h"
@@ -1426,15 +1426,16 @@ listConversions(const char *pattern)
 					  "       pg_catalog.pg_encoding_to_char(c.conforencoding) AS \"%s\",\n"
 					  "       pg_catalog.pg_encoding_to_char(c.contoencoding) AS \"%s\",\n"
 					  "       CASE WHEN c.condefault THEN '%s'\n"
-					  "       ELSE NULL END AS \"%s\"\n"
+					  "       ELSE '%s' END AS \"%s\"\n"
 					  "FROM pg_catalog.pg_conversion c, pg_catalog.pg_namespace n\n"
 					  "WHERE n.oid = c.connamespace\n",
 					  _("Schema"),
 					  _("Name"),
 					  _("Source"),
-					  _("Dest"),
-					  _("default"),
-					  _("Modifier"));
+					  _("Destination"),
+					  _("yes"),
+					  _("no"),
+					  _("Default?"));
 
 	processNamePattern(&buf, pattern, true, false,
 					   "n.nspname", "c.conname", NULL,
@@ -1471,9 +1472,9 @@ listCasts(const char *pattern)
 	initPQExpBuffer(&buf);
 /* NEED LEFT JOIN FOR BINARY CASTS */
 	printfPQExpBuffer(&buf,
-					  "SELECT t1.typname AS \"%s\",\n"
-					  "       t2.typname AS \"%s\",\n"
-					  "       CASE WHEN p.proname IS NULL THEN '%s'\n"
+					  "SELECT pg_catalog.format_type(castsource, NULL) AS \"%s\",\n"
+					  "       pg_catalog.format_type(casttarget, NULL) AS \"%s\",\n"
+					  "       CASE WHEN castfunc = 0 THEN '%s'\n"
 					  "            ELSE p.proname\n"
 					  "       END as \"%s\",\n"
 					  "       CASE WHEN c.castcontext = 'e' THEN '%s'\n"
@@ -1481,16 +1482,16 @@ listCasts(const char *pattern)
 					  "            ELSE '%s'\n"
 					  "       END as \"%s\"\n"
 					  "FROM pg_catalog.pg_cast c LEFT JOIN pg_catalog.pg_proc p\n"
-					  "       ON c.castfunc=p.oid, pg_catalog.pg_type t1, pg_catalog.pg_type t2\n"
-					  "WHERE c.castsource=t1.oid AND c.casttarget=t2.oid ORDER BY 1, 2",
+					  "     ON c.castfunc = p.oid\n"
+					  "ORDER BY 1, 2",
 					  _("Source"),
 					  _("Target"),
 					  _("BINARY"),
 					  _("Function"),
-					  _("explicit"),
-					  _("assignment explicit"),
-					  _("implicit"),
-					  _("Context"));
+					  _("no"),
+					  _("in assignment"),
+					  _("yes"),
+					  _("Implicit?"));
 
 	res = PSQLexec(buf.data, false);
 	termPQExpBuffer(&buf);
@@ -1506,6 +1507,48 @@ listCasts(const char *pattern)
 	return true;
 }
 
+/*
+ * \dn
+ *
+ * Describes schemas (namespaces)
+ */
+bool
+listSchemas(const char *pattern)
+{
+	PQExpBufferData buf;
+	PGresult   *res;
+	printQueryOpt myopt = pset.popt;
+
+	initPQExpBuffer(&buf);
+	printfPQExpBuffer(&buf,
+					  "SELECT n.nspname AS \"%s\",\n"
+					  "       u.usename AS \"%s\"\n"
+					  "FROM pg_catalog.pg_namespace n LEFT JOIN pg_catalog.pg_user u\n"
+					  "       ON n.nspowner=u.usesysid\n",
+					  _("Name"),
+					  _("Owner"));
+
+	processNamePattern(&buf, pattern, false, false,
+					   NULL, "n.nspname", NULL,
+					   NULL);
+
+	appendPQExpBuffer(&buf, "ORDER BY 1;");
+
+	res = PSQLexec(buf.data, false);
+	termPQExpBuffer(&buf);
+	if (!res)
+		return false;
+
+	myopt.nullPrint = NULL;
+	myopt.title = _("List of schemas");
+
+	printQuery(res, &myopt, pset.queryFout);
+
+	PQclear(res);
+	return true;
+}
+
+
 /*
  * processNamePattern
  *

src/bin/psql/describe.h

@@ -3,7 +3,7 @@
  *
  * Copyright 2000-2002 by PostgreSQL Global Development Group
  *
- * $Header: /cvsroot/pgsql/src/bin/psql/describe.h,v 1.19 2002/12/12 21:02:24 momjian Exp $
+ * $Header: /cvsroot/pgsql/src/bin/psql/describe.h,v 1.20 2003/01/07 20:56:07 tgl Exp $
  */
 #ifndef DESCRIBE_H
 #define DESCRIBE_H
@@ -49,5 +49,8 @@ bool		listConversions(const char *pattern);
 /* \dC */
 bool		listCasts(const char *pattern);
 
+/* \dn */
+bool		listSchemas(const char *pattern);
+
 
 #endif   /* DESCRIBE_H */

src/bin/psql/help.c

@@ -3,7 +3,7 @@
  *
  * Copyright 2000 by PostgreSQL Global Development Group
  *
- * $Header: /cvsroot/pgsql/src/bin/psql/help.c,v 1.68 2002/12/13 22:17:57 momjian Exp $
+ * $Header: /cvsroot/pgsql/src/bin/psql/help.c,v 1.69 2003/01/07 20:56:07 tgl Exp $
  */
 #include "postgres_fe.h"
 #include "common.h"
@@ -211,6 +211,7 @@ slashUsage(unsigned short int pager)
 	fprintf(output, _("  \\dd [PATTERN]  show comment for object\n"));
 	fprintf(output, _("  \\dD [PATTERN]  list domains\n"));
 	fprintf(output, _("  \\df [PATTERN]  list functions (add \"+\" for more detail)\n"));
+	fprintf(output, _("  \\dn [PATTERN]  list schemas\n"));
 	fprintf(output, _("  \\do [NAME]     list operators\n"));
 	fprintf(output, _("  \\dl            list large objects, same as \\lo_list\n"));
 	fprintf(output, _("  \\dp [PATTERN]  list table access privileges\n"));

src/include/catalog/namespace.h

@@ -7,7 +7,7 @@
  * Portions Copyright (c) 1996-2002, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
- * $Id: namespace.h,v 1.23 2002/12/12 21:02:25 momjian Exp $
+ * $Id: namespace.h,v 1.24 2003/01/07 20:56:07 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -65,8 +65,9 @@ extern bool OperatorIsVisible(Oid oprid);
 extern OpclassCandidateList OpclassGetCandidates(Oid amid);
 extern Oid	OpclassnameGetOpcid(Oid amid, const char *opcname);
 extern bool OpclassIsVisible(Oid opcid);
-extern bool ConversionIsVisible(Oid opcid);
+
 extern Oid	ConversionGetConid(const char *conname);
+extern bool ConversionIsVisible(Oid conid);
 
 extern void DeconstructQualifiedName(List *names,
 						 char **nspname_p,