Timeline improvements (#41)

Tidying up.
Parent/child statuses now display correctly in status/id/context.

internal/db/pg/statuscontext.go

@@ -0,0 +1,75 @@
+package pg
+
+import (
+	"container/list"
+	"errors"
+
+	"github.com/superseriousbusiness/gotosocial/internal/gtsmodel"
+)
+
+func (ps *postgresService) StatusParents(status *gtsmodel.Status) ([]*gtsmodel.Status, error) {
+	parents := []*gtsmodel.Status{}
+	ps.statusParent(status, &parents)
+
+	return parents, nil
+}
+
+func (ps *postgresService) statusParent(status *gtsmodel.Status, foundStatuses *[]*gtsmodel.Status) {
+	if status.InReplyToID == "" {
+		return
+	}
+
+	parentStatus := &gtsmodel.Status{}
+	if err := ps.conn.Model(parentStatus).Where("id = ?", status.InReplyToID).Select(); err == nil {
+		*foundStatuses = append(*foundStatuses, parentStatus)
+	}
+
+	ps.statusParent(parentStatus, foundStatuses)
+}
+
+func (ps *postgresService) StatusChildren(status *gtsmodel.Status) ([]*gtsmodel.Status, error) {
+	foundStatuses := &list.List{}
+	foundStatuses.PushFront(status)
+	ps.statusChildren(status, foundStatuses)
+
+	children := []*gtsmodel.Status{}
+	for e := foundStatuses.Front(); e != nil; e = e.Next() {
+		entry, ok := e.Value.(*gtsmodel.Status)
+		if !ok {
+			panic(errors.New("entry in foundStatuses was not a *gtsmodel.Status"))
+		}
+
+		// only append children, not the overall parent status
+		if entry.ID != status.ID {
+			children = append(children, entry)
+		}
+	}
+
+	return children, nil
+}
+
+func (ps *postgresService) statusChildren(status *gtsmodel.Status, foundStatuses *list.List) {
+	immediateChildren := []*gtsmodel.Status{}
+
+	err := ps.conn.Model(&immediateChildren).Where("in_reply_to_id = ?", status.ID).Select()
+	if err != nil {
+		return
+	}
+
+	for _, child := range immediateChildren {
+	insertLoop:
+		for e := foundStatuses.Front(); e != nil; e = e.Next() {
+			entry, ok := e.Value.(*gtsmodel.Status)
+			if !ok {
+				panic(errors.New("entry in foundStatuses was not a *gtsmodel.Status"))
+			}
+
+			if child.InReplyToAccountID != "" && entry.ID == child.InReplyToID {
+				foundStatuses.InsertAfter(child, e)
+				break insertLoop
+			}
+		}
+
+		ps.statusChildren(child, foundStatuses)
+	}
+}