optimized diff algorithm further; fixed a stupid bug; cleaned up the tests

tests/difftest.nim

@@ -2,10 +2,19 @@
 include "../src/karax"
 import "../src/karaxdsl"
 
+proc hasDom(n: Vnode) =
+  if n.kind in {VNodeKind.component, VNodeKind.vthunk, VNodeKind.dthunk}:
+    discard
+  else:
+    doAssert n.dom != nil
+    for i in 0..<n.len: hasDom(n[i])
+
 proc doDiff(a, b: VNode) =
-  var patches: seq[Patch] = @[]
-  echo diff(nil, vnodeToDom(a, kxi), b, a, patches, kxi)
-  echo patches
+  var patches = newJSeq[Patch]()
+  echo diff(b, a, nil, vnodeToDom(a, kxi), patches)
+  for i in 0..<patches.len:
+    echo patches[i]
+  #hasDom(kxi.currentTree)
 
 proc testAppend() =
   let a = buildHtml(tdiv):
@@ -31,7 +40,19 @@ proc testInsert() =
       li: text "C"
   doDiff(a, b)
 
+proc testDelete() =
+  let a = buildHtml(tdiv):
+    ul:
+      li: text "A"
+      li: text "B"
+      li: text "C"
+  let b = buildHtml(tdiv):
+    ul:
+      discard
+  doDiff(a, b)
+
 kxi = KaraxInstance(rootId: cstring"ROOT", renderer: proc (): VNode = discard)
 
-#testAppend()
+testAppend()
 testInsert()
+testDelete()