1 files changed, 36 insertions, 0 deletions
diff --git a/tex/context/base/trac-ctx.lua b/tex/context/base/trac-ctx.lua
new file mode 100644
index 000000000..813443816
--- /dev/null
+++ b/tex/context/base/trac-ctx.lua
@@ -0,0 +1,36 @@
+if not modules then modules = { } end modules ['trac-ctx'] = {
+    version   = 1.001,
+    comment   = "companion to trac-ctx.mkiv",
+    author    = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
+    copyright = "PRAGMA ADE / ConTeXt Development Team",
+    license   = "see context related readme files"
+}
+
+local commands, context = commands, context
+
+tex.trackers = tex.trackers or { }
+
+local textrackers = tex.trackers
+local register    = trackers.register
+
+storage.register("tex/trackers",textrackers,"tex.trackers")
+
+local function doit(tag,v)
+    local tt = textrackers[tag]
+    if tt then
+        context.unprotect()
+        context(v and tt[1] or tt[2])
+        context.protect()
+    end
+end
+
+function commands.initializetextrackers()
+    for tag, commands in next, textrackers do
+        register(tag, function(v) doit(tag,v) end) -- todo: v,tag in caller
+    end
+end
+
+function commands.installtextracker(tag,enable,disable)
+    textrackers[tag] = { enable, disable }
+    register(tag, function(v) doit(tag,v) end) -- todo: v,tag in caller
+end