ClosePath method to close contours

Sources/UFOKit/GLIFPointPen.swift

@@ -25,6 +25,29 @@ public class GLIFPointPen: PointPen {
     prevOffCurveCount = 0
   }
 
+    public func closePath() throws {
+        print ("Close Path")
+        if let currentContour = currentContour {
+            if firstSegmentType == .move && lastSegmentType == .offCurve {
+              throw UFOError.openContourEndsOffCurve
+            }
+            let length = currentContour.childCount
+            guard length != 0,
+                  let first = currentContour.children?[0] as? XMLElement,
+                  let last = currentContour.children? [length - 1] as? XMLElement,
+                  first.name == "point",
+                  last.name == "point",
+                  let connectionType = last.attribute(forName: "type" )
+            else { throw UFOError.pathTooShort }
+            first.attribute(forName: "type")?.stringValue = connectionType.stringValue
+            currentContour.removeChild(at: length - 1)
+            outlineElement.addChild(currentContour)
+        } else {
+            throw UFOError.pathNotBegun
+        }
+        currentContour = nil
+    }
+
   public func endPath() throws {
     if let currentContour = currentContour {
       if firstSegmentType == .move && lastSegmentType == .offCurve {

Sources/UFOKit/UFOKit.swift

@@ -55,6 +55,7 @@ public enum UFOError: Error {
   case offCurveNotFollowedByCurve
   case tooManyOffCurvesBeforeCurve
   case offCurveCannotBeSmooth
+  case pathTooShort
 }
 
 public enum UFOFormatVersion: Int, Codable {