more work integration new timeline code

internal/cache/timeline/timeline.go

@@ -0,0 +1,30 @@
+package timeline
+
+import (
+	"codeberg.org/gruf/go-structr"
+	"github.com/superseriousbusiness/gotosocial/internal/paging"
+)
+
+func nextPageParams(
+	curLo, curHi string, // current page params
+	nextLo, nextHi string, // next lo / hi values
+	order paging.Order,
+) (lo string, hi string) {
+	if order.Ascending() {
+
+	} else /* i.e. descending */ {
+
+	}
+}
+
+// toDirection converts page order to timeline direction.
+func toDirection(o paging.Order) structr.Direction {
+	switch o {
+	case paging.OrderAscending:
+		return structr.Asc
+	case paging.OrderDescending:
+		return structr.Desc
+	default:
+		return false
+	}
+}