1 files changed, 61 insertions, 0 deletions
diff --git a/Master/texmf-dist/tex/context/base/layo-ini.lua b/Master/texmf-dist/tex/context/base/layo-ini.lua
new file mode 100644
index 00000000000..56ced2c0bc8
--- /dev/null
+++ b/Master/texmf-dist/tex/context/base/layo-ini.lua
@@ -0,0 +1,61 @@
+if not modules then modules = { } end modules ['layo-ini'] = {
+    version   = 1.001,
+    comment   = "companion to layo-ini.mkiv",
+    author    = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
+    copyright = "PRAGMA ADE / ConTeXt Development Team",
+    license   = "see context related readme files"
+}
+
+-- We need to share information between the TeX and Lua end
+-- about the typographical model. This happens here.
+--
+-- Code might move.
+
+-- conditionals.layoutisdoublesided
+-- conditionals.layoutissinglesided
+-- texcount.pagenoshift
+-- texcount.realpageno
+
+local texcount     = tex.count
+local conditionals = tex.conditionals
+
+layouts = {
+    status = { },
+}
+
+local status = layouts.status
+
+function status.leftorrightpagection(left,right)
+    if left == nil then
+        left, right = false, true
+    end
+    if not conditionals.layoutisdoublesided then
+        return left, right
+    elseif conditionals.layoutissinglesided then
+        return left, right
+    elseif texcount.pagenoshift % 2 == 0 then
+        if texcount.realpageno % 2 == 0 then
+            return right, left
+        else
+            return left, right
+        end
+    else
+        if texcount.realpageno % 2 == 0 then
+            return left, right
+        else
+            return right, left
+        end
+    end
+end
+
+function status.isleftpage()
+    if not conditionals.layoutisdoublesided then
+        return false
+    elseif conditionals.layoutissinglesided then
+        return false
+    elseif texcount.pagenoshift % 2 == 0 then
+        return texcount.realpageno % 2 == 0
+    else
+        return not texcount.realpageno % 2 == 0
+    end
+end