psql: Improve tab completion for ALTER TABLE on identity columns

- Add tab completion for ALTER SEQUENCE … START …
- Add tab completion for ALTER COLUMN … SET GENERATED …
- Add tab completion for ALTER COLUMN … SET <sequence option>
- Add tab completion for ALTER COLUMN … ADD GENERATED … AS IDENTITY

Author: Dagfinn Ilmari Mannsåker <ilmari@ilmari.org>
Reviewed-by: Matheus Alcantara <mths.dev@pm.me>
Discussion: https://www.postgresql.org/message-id/flat/87mta1jfax.fsf@wibble.ilmari.org

diff --git a/src/bin/psql/tab-complete.c b/src/bin/psql/tab-complete.c
index a64571215b332500bb8f3b4e7015c2b7a561cd1f..4c45e4747a970267c54d0e864773552601807bed 100644 (file)
--- a/src/bin/psql/tab-complete.c
+++ b/src/bin/psql/tab-complete.c
@@ -2104,7 +2104,7 @@ psql_completion(const char *text, int start, int end)
    /* ALTER SEQUENCE <name> */
    else if (Matches("ALTER", "SEQUENCE", MatchAny))
        COMPLETE_WITH("AS", "INCREMENT", "MINVALUE", "MAXVALUE", "RESTART",
-                     "NO", "CACHE", "CYCLE", "SET", "OWNED BY",
+                     "START", "NO", "CACHE", "CYCLE", "SET", "OWNED BY",
                      "OWNER TO", "RENAME TO");
    /* ALTER SEQUENCE <name> AS */
    else if (TailMatches("ALTER", "SEQUENCE", MatchAny, "AS"))
@@ -2381,10 +2381,26 @@ psql_completion(const char *text, int start, int end)
    else if (Matches("ALTER", "TABLE", MatchAny, "ALTER", "COLUMN", MatchAny) ||
             Matches("ALTER", "TABLE", MatchAny, "ALTER", MatchAny))
        COMPLETE_WITH("TYPE", "SET", "RESET", "RESTART", "ADD", "DROP");
+   /* ALTER TABLE ALTER [COLUMN] <foo> ADD */
+   else if (Matches("ALTER", "TABLE", MatchAny, "ALTER", "COLUMN", MatchAny, "ADD") ||
+            Matches("ALTER", "TABLE", MatchAny, "ALTER", MatchAny, "ADD"))
+       COMPLETE_WITH("GENERATED");
+   /* ALTER TABLE ALTER [COLUMN] <foo> ADD GENERATED */
+   else if (Matches("ALTER", "TABLE", MatchAny, "ALTER", "COLUMN", MatchAny, "ADD", "GENERATED") ||
+            Matches("ALTER", "TABLE", MatchAny, "ALTER", MatchAny, "ADD", "GENERATED"))
+       COMPLETE_WITH("ALWAYS", "BY DEFAULT");
+   /* ALTER TABLE ALTER [COLUMN] <foo> ADD GENERATED */
+   else if (Matches("ALTER", "TABLE", MatchAny, "ALTER", "COLUMN", MatchAny, "ADD", "GENERATED", "ALWAYS") ||
+            Matches("ALTER", "TABLE", MatchAny, "ALTER", MatchAny, "ADD", "GENERATED", "ALWAYS") ||
+            Matches("ALTER", "TABLE", MatchAny, "ALTER", "COLUMN", MatchAny, "ADD", "GENERATED", "BY", "DEFAULT") ||
+            Matches("ALTER", "TABLE", MatchAny, "ALTER", MatchAny, "ADD", "GENERATED", "BY", "DEFAULT"))
+       COMPLETE_WITH("AS IDENTITY");
    /* ALTER TABLE ALTER [COLUMN] <foo> SET */
    else if (Matches("ALTER", "TABLE", MatchAny, "ALTER", "COLUMN", MatchAny, "SET") ||
             Matches("ALTER", "TABLE", MatchAny, "ALTER", MatchAny, "SET"))
-       COMPLETE_WITH("(", "COMPRESSION", "DEFAULT", "NOT NULL", "STATISTICS", "STORAGE");
+       COMPLETE_WITH("(", "COMPRESSION", "DEFAULT", "GENERATED", "NOT NULL", "STATISTICS", "STORAGE",
+       /* a subset of ALTER SEQUENCE options */
+                     "INCREMENT", "MINVALUE", "MAXVALUE", "START", "NO", "CACHE", "CYCLE");
    /* ALTER TABLE ALTER [COLUMN] <foo> SET ( */
    else if (Matches("ALTER", "TABLE", MatchAny, "ALTER", "COLUMN", MatchAny, "SET", "(") ||
             Matches("ALTER", "TABLE", MatchAny, "ALTER", MatchAny, "SET", "("))
@@ -2393,6 +2409,14 @@ psql_completion(const char *text, int start, int end)
    else if (Matches("ALTER", "TABLE", MatchAny, "ALTER", "COLUMN", MatchAny, "SET", "COMPRESSION") ||
             Matches("ALTER", "TABLE", MatchAny, "ALTER", MatchAny, "SET", "COMPRESSION"))
        COMPLETE_WITH("DEFAULT", "PGLZ", "LZ4");
+   /* ALTER TABLE ALTER [COLUMN] <foo> SET GENERATED */
+   else if (Matches("ALTER", "TABLE", MatchAny, "ALTER", "COLUMN", MatchAny, "SET", "GENERATED") ||
+            Matches("ALTER", "TABLE", MatchAny, "ALTER", MatchAny, "SET", "GENERATED"))
+       COMPLETE_WITH("ALWAYS", "BY DEFAULT");
+   /* ALTER TABLE ALTER [COLUMN] <foo> SET NO */
+   else if (Matches("ALTER", "TABLE", MatchAny, "ALTER", "COLUMN", MatchAny, "SET", "NO") ||
+            Matches("ALTER", "TABLE", MatchAny, "ALTER", MatchAny, "SET", "NO"))
+       COMPLETE_WITH("MINVALUE", "MAXVALUE", "CYCLE");
    /* ALTER TABLE ALTER [COLUMN] <foo> SET STORAGE */
    else if (Matches("ALTER", "TABLE", MatchAny, "ALTER", "COLUMN", MatchAny, "SET", "STORAGE") ||
             Matches("ALTER", "TABLE", MatchAny, "ALTER", MatchAny, "SET", "STORAGE"))