[PATCH] Feature improvement for TRUNCATE tab completion.

[miyake_kouta]

Hi.

I created a patch which improves psql's TRUNCATE tab completion.
Current tab completion can complement only a table name to be truncated.
This patch enables psql to complement other keywords related to 
TRUNCATE.

Regards.
Kota Miyakediff --git a/src/bin/psql/tab-complete.c b/src/bin/psql/tab-complete.c
index 1e1c315bae..ef9ef4cb25 100644
--- a/src/bin/psql/tab-complete.c
+++ b/src/bin/psql/tab-complete.c
@@ -3799,7 +3799,20 @@ psql_completion(const char *text, int start, int end)
 
 /* TRUNCATE */
 	else if (Matches("TRUNCATE"))
+		COMPLETE_WITH_SCHEMA_QUERY(Query_for_list_of_tables,
+							" UNION SELECT 'TABLE'"
+							" UNION SELECT 'ONLY'");
+	else if (Matches("TRUNCATE", "TABLE"))
+		COMPLETE_WITH_SCHEMA_QUERY(Query_for_list_of_tables,
+							" UNION SELECT 'ONLY'");
+	else if (HeadMatches("TRUNCATE") && TailMatches("ONLY"))
 		COMPLETE_WITH_SCHEMA_QUERY(Query_for_list_of_tables, NULL);
+	else if (Matches("TRUNCATE", MatchAny) ||
+			Matches("TRUNCATE", "TABLE|ONLY", MatchAny) ||
+			Matches("TRUNCATE", "TABLE", "ONLY", MatchAny))
+		COMPLETE_WITH("RESTART IDENTITY", "CONTINUE IDENTITY", "CASCADE", "RESTRICT");
+	else if (HeadMatches("TRUNCATE") && TailMatches("IDENTITY"))
+		COMPLETE_WITH("CASCADE", "RESTRICT");
 
 /* UNLISTEN */
 	else if (Matches("UNLISTEN"))