1 files changed, 143 insertions, 0 deletions
diff --git a/Master/texmf-dist/tex/context/base/back-ini.lua b/Master/texmf-dist/tex/context/base/back-ini.lua
new file mode 100644
index 00000000000..bad6b0282d5
--- /dev/null
+++ b/Master/texmf-dist/tex/context/base/back-ini.lua
@@ -0,0 +1,143 @@
+if not modules then modules = { } end modules ['back-ini'] = {
+    version   = 1.001,
+    comment   = "companion to back-ini.tex",
+    author    = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
+    copyright = "PRAGMA ADE / ConTeXt Development Team",
+    license   = "see context related readme files"
+}
+
+backends = backends or { }
+
+local trace_backend = false
+
+local function nothing() return nil end
+
+backends.nothing = nothing
+
+backends.nodeinjections = {
+    rgbcolor     = nothing,
+    cmykcolor    = nothing,
+    graycolor    = nothing,
+    spotcolor    = nothing,
+    transparency = nothing,
+    overprint    = nothing,
+    knockout     = nothing,
+    positive     = nothing,
+    negative     = nothing,
+    effect       = nothing,
+    startlayer   = nothing,
+    stoplayer    = nothing,
+    switchlayer  = nothing,
+
+    reference    = nothing,
+    destination  = nothing,
+
+}
+
+backends.codeinjections = {
+
+    prerollreference      = nothing,
+
+    insertmovie           = nothing,
+    insertsound           = nothing,
+
+    presetsymbollist      = nothing,
+    registersymbol        = nothing,
+    registeredsymbol      = nothing,
+
+    registercomment       = nothing,
+    attachfile            = nothing,
+    adddocumentinfo       = nothing,
+    setupidentity         = nothing,
+    setpagetransition     = nothing,
+    defineviewerlayer     = nothing,
+    addbookmarks          = nothing,
+    addtransparencygroup  = nothing,
+
+    typesetfield          = nothing,
+    finishfields          = nothing,
+    doiffieldelse         = nothing,
+    doiffieldgroupelse    = nothing,
+    definefield           = nothing,
+    clonefield            = nothing,
+    definefieldset        = nothing,
+    getfieldgroup         = nothing,
+    setformsmethod        = nothing,
+    getdefaultfieldvalue  = nothing,
+
+    setupcanvas           = nothing,
+
+    initializepage        = nothing,
+    initializedocument    = nothing,
+    finalizepage          = nothing,
+    finalizedocument      = nothing,
+
+    flushpageactions      = nothing,
+    flushdocumentactions  = nothing,
+
+    insertrenderingwindow = nothing,
+    processrendering      = nothing,
+    kindofrendering       = nothing,
+    flushrenderingwindow  = nothing,
+
+    setfigurecolorspace   = nothing,
+    setfigurealternative  = nothing,
+
+}
+
+backends.registrations = {
+    grayspotcolor  = nothing,
+    rgbspotcolor   = nothing,
+    cmykspotcolor  = nothing,
+    grayindexcolor = nothing,
+    rgbindexcolor  = nothing,
+    cmykindexcolor = nothing,
+    spotcolorname  = nothing,
+    transparency   = nothing,
+}
+
+local nodeinjections = backends.nodeinjections
+local codeinjections = backends.codeinjections
+local registrations  = backends.registrations
+
+backends.current = "unknown"
+
+function backends.install(what)
+    if type(what) == "string" then
+        local backend = backends[what]
+        if backend then
+            if trace_backend then
+                logs.report("backend", "initializing backend %s (%s)",what,backend.comment or "no comment")
+            end
+            backends.current = what
+            for _, category in next, { "nodeinjections", "codeinjections", "registrations"} do
+                local plugin = backend[category]
+                if plugin then
+                    local whereto = backends[category]
+                    for name, meaning in next, whereto do
+                        if plugin[name] then
+                            whereto[name] = plugin[name]
+                        --  logs.report("backend", "installing function %s in category %s of %s",name,category,what)
+                        elseif trace_backend then
+                            logs.report("backend", "no function %s in category %s of %s",name,category,what)
+                        end
+                    end
+                elseif trace_backend then
+                    logs.report("backend", "no category %s in %s",category,what)
+                end
+            end
+            backends.helpers = backend.helpers
+        elseif trace_backend then
+            logs.report("backend", "no backend named %s",what)
+        end
+    end
+end
+
+statistics.register("used backend", function()
+    local bc = backends.current
+    if bc ~= "unknown" then
+        return string.format("%s (%s)",bc,backends[bc].comment or "no comment")
+    else
+        return nil
+    end
+end)