Make psql's \sf and \ef honor ECHO_HIDDEN.

These commands were calling the database direct rather than  calling
PSQLexec like other slash commands that needed database data.

The code is also changed not to pass the connection as a parameter to
the helper functions. It's available in a global variable, and that's
what PSQLexec uses.

src/bin/psql/command.c

@@ -62,8 +62,8 @@ static bool do_edit(const char *filename_arg, PQExpBuffer query_buf,
 static bool do_connect(char *dbname, char *user, char *host, char *port);
 static bool do_shell(const char *command);
 static bool do_watch(PQExpBuffer query_buf, long sleep);
-static bool lookup_function_oid(PGconn *conn, const char *desc, Oid *foid);
+static bool lookup_function_oid(const char *desc, Oid *foid);
-static bool get_create_function_cmd(PGconn *conn, Oid oid, PQExpBuffer buf);
+static bool get_create_function_cmd(Oid oid, PQExpBuffer buf);
 static int	strip_lineno_from_funcdesc(char *func);
 static void minimal_error_message(PGresult *res);
 
@@ -611,12 +611,12 @@ exec_command(const char *cmd,
 								  "AS $function$\n"
 								  "\n$function$\n");
 			}
-			else if (!lookup_function_oid(pset.db, func, &foid))
+			else if (!lookup_function_oid(func, &foid))
 			{
 				/* error already reported */
 				status = PSQL_CMD_ERROR;
 			}
-			else if (!get_create_function_cmd(pset.db, foid, query_buf))
+			else if (!get_create_function_cmd(foid, query_buf))
 			{
 				/* error already reported */
 				status = PSQL_CMD_ERROR;
@@ -1215,12 +1215,12 @@ exec_command(const char *cmd,
 			psql_error("function name is required\n");
 			status = PSQL_CMD_ERROR;
 		}
-		else if (!lookup_function_oid(pset.db, func, &foid))
+		else if (!lookup_function_oid(func, &foid))
 		{
 			/* error already reported */
 			status = PSQL_CMD_ERROR;
 		}
-		else if (!get_create_function_cmd(pset.db, foid, func_buf))
+		else if (!get_create_function_cmd(foid, func_buf))
 		{
 			/* error already reported */
 			status = PSQL_CMD_ERROR;
@@ -2934,7 +2934,7 @@ do_watch(PQExpBuffer query_buf, long sleep)
  * unfortunately it can be hard to tell the difference.
  */
 static bool
-lookup_function_oid(PGconn *conn, const char *desc, Oid *foid)
+lookup_function_oid(const char *desc, Oid *foid)
 {
 	bool		result = true;
 	PQExpBuffer query;
@@ -2942,11 +2942,11 @@ lookup_function_oid(PGconn *conn, const char *desc, Oid *foid)
 
 	query = createPQExpBuffer();
 	appendPQExpBufferStr(query, "SELECT ");
-	appendStringLiteralConn(query, desc, conn);
+	appendStringLiteralConn(query, desc, pset.db);
 	appendPQExpBuffer(query, "::pg_catalog.%s::pg_catalog.oid",
 					  strchr(desc, '(') ? "regprocedure" : "regproc");
 
-	res = PQexec(conn, query->data);
+	res = PSQLexec(query->data);
 	if (PQresultStatus(res) == PGRES_TUPLES_OK && PQntuples(res) == 1)
 		*foid = atooid(PQgetvalue(res, 0, 0));
 	else
@@ -2966,7 +2966,7 @@ lookup_function_oid(PGconn *conn, const char *desc, Oid *foid)
  * function with the given OID.  If successful, the result is stored in buf.
  */
 static bool
-get_create_function_cmd(PGconn *conn, Oid oid, PQExpBuffer buf)
+get_create_function_cmd(Oid oid, PQExpBuffer buf)
 {
 	bool		result = true;
 	PQExpBuffer query;
@@ -2975,7 +2975,7 @@ get_create_function_cmd(PGconn *conn, Oid oid, PQExpBuffer buf)
 	query = createPQExpBuffer();
 	printfPQExpBuffer(query, "SELECT pg_catalog.pg_get_functiondef(%u)", oid);
 
-	res = PQexec(conn, query->data);
+	res = PSQLexec(query->data);
 	if (PQresultStatus(res) == PGRES_TUPLES_OK && PQntuples(res) == 1)
 	{
 		resetPQExpBuffer(buf);