WIP: Begin cleaning up duct sizing routes.

Sources/ViewController/Extensions/TrunkSizeForm+extensions.swift

@@ -0,0 +1,44 @@
+import Foundation
+import Logging
+import ManualDCore
+
+extension SiteRoute.View.ProjectRoute.DuctSizingRoute.TrunkSizeForm {
+
+  func toCreate(logger: Logger? = nil) throws -> DuctSizing.TrunkSize.Create {
+    try .init(
+      projectID: projectID,
+      type: type,
+      rooms: makeRooms(logger: logger),
+      height: height
+    )
+  }
+
+  func makeRooms(logger: Logger?) throws -> [Room.ID: [Int]] {
+    var retval = [Room.ID: [Int]]()
+    for room in rooms {
+      let split = room.split(separator: "_")
+      guard let idString = split.first,
+        let id = UUID(uuidString: String(idString))
+      else {
+        logger?.error("Could not parse id from: \(room)")
+        throw RoomError()
+      }
+      guard let registerString = split.last,
+        let register = Int(registerString)
+      else {
+        logger?.error("Could not register number from: \(room)")
+        throw RoomError()
+      }
+      if var currRegisters = retval[id] {
+        currRegisters.append(register)
+        retval[id] = currRegisters
+      } else {
+        retval[id] = [register]
+      }
+
+    }
+    return retval
+  }
+}
+
+struct RoomError: Error {}