xlsxir.patch

diff --git a/lib/xlsxir/parse_workbook.ex b/lib/xlsxir/parse_workbook.ex
index c620350..233b8fb 100644
--- a/lib/xlsxir/parse_workbook.ex
+++ b/lib/xlsxir/parse_workbook.ex
@@ -37,8 +37,11 @@ defmodule Xlsxir.ParseWorkbook do
   end
 
   def sax_event_handler(:endDocument, %__MODULE__{tid: tid} = state) do
-    Enum.map(state.sheets, fn %{sheet_id: sheet_id, name: name} ->
-      :ets.insert(tid, {sheet_id, name})
+    state.sheets
+    |> Enum.reverse()
+    |> Enum.with_index(1)
+    |> Enum.each(fn {%{name: name}, index} ->
+      :ets.insert(tid, {index, name})
     end)
 
     state
diff --git a/test/test_data/swapped-sheet-order.xlsx b/test/test_data/swapped-sheet-order.xlsx
new file mode 100644
index 0000000..a694433
Binary files /dev/null and b/test/test_data/swapped-sheet-order.xlsx differ
diff --git a/test/xlsxir_test.exs b/test/xlsxir_test.exs
index 3090e76..69eaacf 100644
--- a/test/xlsxir_test.exs
+++ b/test/xlsxir_test.exs
@@ -157,4 +157,26 @@ defmodule XlsxirTest do
     assert map["B2"] == "pre 2008"
     assert map["B3"] == "https://msdn.microsoft.com/en-us/library/office/gg278314.aspx"
   end
+
+  test "swapped order of sheets still correctly identifies sheet names" do
+    # The order of <sheet> tags in the workbook.xml will match the "sheet(index+1).xml" file names
+    # of the worksheets. (see also %Xlsxir.XmlFile{name: "sheet#.xml"}
+    # Previously the framework relied on the rid or sheetId values to identify the order
+    # sheetId especially is unreliable for this because its numbers are created like a
+    # sequential id in a database and moving sheets or deleting sheets can lead to gaps
+    # and non-sequential values.
+    [{:ok, pid_sheet_2}, {:ok, pid_sheet_1}] = multi_extract("./test/test_data/swapped-sheet-order.xlsx")
+    on_exit(fn ->
+      close(pid_sheet_1)
+      close(pid_sheet_2)
+    end)
+    map_sheet_2 = get_map(pid_sheet_2)
+    map_sheet_1 = get_map(pid_sheet_1)
+
+    assert map_sheet_2["A1"] == "SHEET2CELL"
+    assert map_sheet_1["A1"] == "SHEET1CELL"
+
+    assert get_info(pid_sheet_2, :name) == "Sheet2"
+    assert get_info(pid_sheet_1, :name) == "Sheet1"
+  end
 end