Improve tab completion for CREATE TRIGGER.

This includes support for the new REFERENCING clause.

src/bin/psql/tab-complete.c

@@ -2209,9 +2209,43 @@ psql_completion(const char *text, int start, int end)
 	/* complete CREATE TRIGGER ... INSTEAD OF event ON with a list of views */
 	else if (TailMatches7("CREATE", "TRIGGER", MatchAny, "INSTEAD", "OF", MatchAny, "ON"))
 		COMPLETE_WITH_SCHEMA_QUERY(Query_for_list_of_views, NULL);
+	else if (HeadMatches2("CREATE", "TRIGGER") && TailMatches2("ON", MatchAny))
+		COMPLETE_WITH_LIST7("NOT DEFERRABLE", "DEFERRABLE", "INITIALLY",
+							"REFERENCING", "FOR", "WHEN (", "EXECUTE PROCEDURE");
+	else if (HeadMatches2("CREATE", "TRIGGER") &&
+			 (TailMatches1("DEFERRABLE") || TailMatches2("INITIALLY", "IMMEDIATE|DEFERRED")))
+		COMPLETE_WITH_LIST4("REFERENCING", "FOR", "WHEN (", "EXECUTE PROCEDURE");
+	else if (HeadMatches2("CREATE", "TRIGGER") && TailMatches1("REFERENCING"))
+		COMPLETE_WITH_LIST2("OLD TABLE", "NEW TABLE");
+	else if (HeadMatches2("CREATE", "TRIGGER") && TailMatches2("OLD|NEW", "TABLE"))
+		COMPLETE_WITH_CONST("AS");
+	else if (HeadMatches2("CREATE", "TRIGGER") &&
+			 (TailMatches5("REFERENCING", "OLD", "TABLE", "AS", MatchAny) ||
+			  TailMatches4("REFERENCING", "OLD", "TABLE", MatchAny)))
+		COMPLETE_WITH_LIST4("NEW TABLE", "FOR", "WHEN (", "EXECUTE PROCEDURE");
+	else if (HeadMatches2("CREATE", "TRIGGER") &&
+			 (TailMatches5("REFERENCING", "NEW", "TABLE", "AS", MatchAny) ||
+			  TailMatches4("REFERENCING", "NEW", "TABLE", MatchAny)))
+		COMPLETE_WITH_LIST4("OLD TABLE", "FOR", "WHEN (", "EXECUTE PROCEDURE");
+	else if (HeadMatches2("CREATE", "TRIGGER") &&
+			 (TailMatches9("REFERENCING", "OLD|NEW", "TABLE", "AS", MatchAny, "OLD|NEW", "TABLE", "AS", MatchAny) ||
+			  TailMatches8("REFERENCING", "OLD|NEW", "TABLE", MatchAny, "OLD|NEW", "TABLE", "AS", MatchAny) ||
+			  TailMatches8("REFERENCING", "OLD|NEW", "TABLE", "AS", MatchAny, "OLD|NEW", "TABLE", MatchAny) ||
+			  TailMatches7("REFERENCING", "OLD|NEW", "TABLE", MatchAny, "OLD|NEW", "TABLE", MatchAny)))
+		COMPLETE_WITH_LIST3("FOR", "WHEN (", "EXECUTE PROCEDURE");
+	else if (HeadMatches2("CREATE", "TRIGGER") && TailMatches1("FOR"))
+		COMPLETE_WITH_LIST3("EACH", "ROW", "STATEMENT");
+	else if (HeadMatches2("CREATE", "TRIGGER") && TailMatches2("FOR", "EACH"))
+		COMPLETE_WITH_LIST2("ROW", "STATEMENT");
+	else if (HeadMatches2("CREATE", "TRIGGER") &&
+			 (TailMatches3("FOR", "EACH", "ROW|STATEMENT") ||
+			  TailMatches2("FOR", "ROW|STATEMENT")))
+		COMPLETE_WITH_LIST2("WHEN (", "EXECUTE PROCEDURE");
 	/* complete CREATE TRIGGER ... EXECUTE with PROCEDURE */
 	else if (HeadMatches2("CREATE", "TRIGGER") && TailMatches1("EXECUTE"))
 		COMPLETE_WITH_CONST("PROCEDURE");
+	else if (HeadMatches2("CREATE", "TRIGGER") && TailMatches2("EXECUTE", "PROCEDURE"))
+		COMPLETE_WITH_SCHEMA_QUERY(Query_for_list_of_functions, NULL);
 
 /* CREATE ROLE,USER,GROUP <name> */
 	else if (Matches3("CREATE", "ROLE|GROUP|USER", MatchAny) &&