move {bug,identity} to /entities, move input to /commands

1 files changed, 57 insertions, 0 deletions

diff --git a/entities/bug/sorting.go b/entities/bug/sorting.go
new file mode 100644
index 00000000..2e64b92d
--- /dev/null
+++ b/entities/bug/sorting.go
@@ -0,0 +1,57 @@
+package bug
+
+type BugsByCreationTime []*Bug
+
+func (b BugsByCreationTime) Len() int {
+	return len(b)
+}
+
+func (b BugsByCreationTime) Less(i, j int) bool {
+	if b[i].CreateLamportTime() < b[j].CreateLamportTime() {
+		return true
+	}
+
+	if b[i].CreateLamportTime() > b[j].CreateLamportTime() {
+		return false
+	}
+
+	// When the logical clocks are identical, that means we had a concurrent
+	// edition. In this case we rely on the timestamp. While the timestamp might
+	// be incorrect due to a badly set clock, the drift in sorting is bounded
+	// by the first sorting using the logical clock. That means that if users
+	// synchronize their bugs regularly, the timestamp will rarely be used, and
+	// should still provide a kinda accurate sorting when needed.
+	return b[i].FirstOp().Time().Before(b[j].FirstOp().Time())
+}
+
+func (b BugsByCreationTime) Swap(i, j int) {
+	b[i], b[j] = b[j], b[i]
+}
+
+type BugsByEditTime []*Bug
+
+func (b BugsByEditTime) Len() int {
+	return len(b)
+}
+
+func (b BugsByEditTime) Less(i, j int) bool {
+	if b[i].EditLamportTime() < b[j].EditLamportTime() {
+		return true
+	}
+
+	if b[i].EditLamportTime() > b[j].EditLamportTime() {
+		return false
+	}
+
+	// When the logical clocks are identical, that means we had a concurrent
+	// edition. In this case we rely on the timestamp. While the timestamp might
+	// be incorrect due to a badly set clock, the drift in sorting is bounded
+	// by the first sorting using the logical clock. That means that if users
+	// synchronize their bugs regularly, the timestamp will rarely be used, and
+	// should still provide a kinda accurate sorting when needed.
+	return b[i].LastOp().Time().Before(b[j].LastOp().Time())
+}
+
+func (b BugsByEditTime) Swap(i, j int) {
+	b[i], b[j] = b[j], b[i]
+}