impl compat.move for 5.1 vanilla lua

ROADMAP.md

@@ -18,7 +18,7 @@
 - [ ] add batch vector operations
 - [ ] add inplace vector operations
 - [x] cache chunk lists in batch operations
-- [ ] impl compat.move for 5.1 vanilla lua
+- [x] impl compat.move for 5.1 vanilla lua
 - [x] add registry.batch_set
 - [x] rename include/exclude/execute to query_include/exclude/execute
 - [x] rename entities/components to chunk_entities/components

evolved/compat.lua

@@ -10,7 +10,23 @@ compat.unpack = table.unpack or function(list, i, j)
 end
 
 compat.move = table.move or function(a1, f, e, t, a2)
-    error('compat.move is not implemented yet', 2)
+    if a2 == nil then
+        a2 = a1
+    end
+
+    if e < f then
+        return a2
+    end
+
+    local d = t - f
+
+    if t > e or t <= f or a2 ~= a1 then
+        for i = f, e do a2[i + d] = a1[i] end
+    else
+        for i = e, f, -1 do a2[i + d] = a1[i] end
+    end
+
+    return a2
 end
 
 return compat