Timeline manager (#40)

* start messing about with timeline manager

* i have no idea what i'm doing

* i continue to not know what i'm doing

* it's coming along

* bit more progress

* update timeline with new posts as they come in

* lint and fmt

* Select accounts where empty string

* restructure a bunch, get unfaves working

* moving stuff around

* federate status deletes properly

* mention regex better but not 100% there

* fix regex

* some more hacking away at the timeline code phew

* fix up some little things

* i can't even

* more timeline stuff

* move to ulid

* fiddley

* some lil fixes for kibou compatibility

* timelines working pretty alright!

* tidy + lint

internal/timeline/remove.go

@@ -0,0 +1,50 @@
+package timeline
+
+import (
+	"container/list"
+	"errors"
+)
+
+func (t *timeline) Remove(statusID string) (int, error) {
+	t.Lock()
+	defer t.Unlock()
+	var removed int
+
+	// remove entr(ies) from the post index
+	removeIndexes := []*list.Element{}
+	if t.postIndex != nil && t.postIndex.data != nil {
+		for e := t.postIndex.data.Front(); e != nil; e = e.Next() {
+			entry, ok := e.Value.(*postIndexEntry)
+			if !ok {
+				return removed, errors.New("Remove: could not parse e as a postIndexEntry")
+			}
+			if entry.statusID == statusID {
+				removeIndexes = append(removeIndexes, e)
+			}
+		}
+	}
+	for _, e := range removeIndexes {
+		t.postIndex.data.Remove(e)
+		removed = removed + 1
+	}
+
+	// remove entr(ies) from prepared posts
+	removePrepared := []*list.Element{}
+	if t.preparedPosts != nil && t.preparedPosts.data != nil {
+		for e := t.preparedPosts.data.Front(); e != nil; e = e.Next() {
+			entry, ok := e.Value.(*preparedPostsEntry)
+			if !ok {
+				return removed, errors.New("Remove: could not parse e as a preparedPostsEntry")
+			}
+			if entry.statusID == statusID {
+				removePrepared = append(removePrepared, e)
+			}
+		}
+	}
+	for _, e := range removePrepared {
+		t.preparedPosts.data.Remove(e)
+		removed = removed + 1
+	}
+
+	return removed, nil
+}