1 files changed, 65 insertions, 0 deletions
diff --git a/tex/context/base/scrn-ref.lua b/tex/context/base/scrn-ref.lua
new file mode 100644
index 000000000..9609e8aa2
--- /dev/null
+++ b/tex/context/base/scrn-ref.lua
@@ -0,0 +1,65 @@
+if not modules then modules = { } end modules ['scrn-int'] = {
+    version   = 1.001,
+    comment   = "companion to scrn-int.mkiv",
+    author    = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
+    copyright = "PRAGMA ADE / ConTeXt Development Team",
+    license   = "see context related readme files"
+}
+
+interactions            = interactions or { }
+interactions.references = interactions.references or { }
+local references        = interactions.references
+
+local codeinjections    = backends.codeinjections
+
+local expandcurrent     = structures.references.expandcurrent
+local identify          = structures.references.identify
+
+local function check(what)
+    if what and what ~= "" then
+        local set, bug = identify("",what)
+        return not bug and #set > 0 and set
+    end
+end
+
+local function setopendocumentaction(open)
+    local opendocument = check(open)
+    if opendocument then
+        codeinjections.registerdocumentopenaction(opendocument)
+        expandcurrent()
+    end
+end
+
+local function setclosedocumentaction(close)
+    local closedocument = check(close)
+    if closedocument then
+        codeinjections.registerdocumentcloseaction(closedocument)
+        expandcurrent()
+    end
+end
+
+local function setopenpageaction(open)
+    local openpage = check(open)
+    if openpage then
+        codeinjections.registerpageopenaction(openpage)
+        expandcurrent()
+    end
+end
+
+local function setclosepageaction(close)
+    local closepage = check(close)
+    if closepage then
+        codeinjections.registerpagecloseaction(openpage)
+        expandcurrent()
+    end
+end
+
+references.setopendocument      = setopendocumentaction
+references.setclosedocument     = setclosedocumentaction
+references.setopenpage          = setopenpageaction
+references.setclosepage         = setclosepageaction
+
+commands.setopendocumentaction  = setopendocumentaction
+commands.setclosedocumentaction = setclosedocumentaction
+commands.setopenpageaction      = setopenpageaction
+commands.setclosepageaction     = setclosepageaction