format-table: add new table_get_current_column() helper

src/shared/format-table.c

@@ -2577,6 +2577,14 @@ size_t table_get_columns(Table *t) {
         return t->n_columns;
 }
 
+size_t table_get_current_column(Table *t) {
+        if (!t)
+                return 0;
+
+        assert(t->n_columns > 0);
+        return t->n_cells % t->n_columns;
+}
+
 int table_set_reverse(Table *t, size_t column, bool b) {
         assert(t);
         assert(column < t->n_columns);

src/shared/format-table.h

@@ -141,6 +141,8 @@ static inline TableCell* TABLE_HEADER_CELL(size_t i) {
 size_t table_get_rows(Table *t);
 size_t table_get_columns(Table *t);
 
+size_t table_get_current_column(Table *t);
+
 TableCell *table_get_cell(Table *t, size_t row, size_t column);
 
 const void *table_get(Table *t, TableCell *cell);