2 files changed, 90 insertions, 18 deletions

diff --git a/tex/context/third/enigma/enigma.lua b/tex/context/third/enigma/enigma.lua
index 7eec8bc..ad23c2b 100644
--- a/tex/context/third/enigma/enigma.lua
+++ b/tex/context/third/enigma/enigma.lua
@@ -92,6 +92,23 @@ local utf8len                      = unicode.utf8.len
 local utf8sub                      = unicode.utf8.sub
 local utfcharacters                = string.utfcharacters
 
+local tablecopy
+if format_is_context_p then
+  tablecopy = table.copy
+else
+  tablecopy = function (t) -- ignores tables as keys
+    local result = { }
+    for k, v in next, t do
+      if type(v) == table then
+        result[k] = tablecopy(v)
+      else
+        result[k] = v
+      end
+    end
+    return result
+  end
+end
+
 local glyph_node                   = nodeid"glyph"
 local glue_node                    = nodeid"glue"
 
@@ -1189,10 +1206,11 @@ on \dots\ many thanks to Khaled Hosny, who posted an answer to
 \stopparagraph
 --ichd]]--
 
-enigma.new_callback = function (machine, name)
+local new_callback = function (machine, name)
   enigma.machines [name] = machine
   local format_is_context_p = format_is_context_p
   local cbk = function (a, _, c)
+    print(name, "<<<<<<<<<<<<<<<<<<<")
     local head = format_is_context_p and c or a
     for n in nodetraverse(head) do
       --print(node, node.id)
@@ -1218,7 +1236,6 @@ enigma.new_callback = function (machine, name)
         noderemove(head, n)
       end
     end
-    --if context then return head, true end
     return head
   end
   if format_is_context_p then
@@ -1229,20 +1246,41 @@ enigma.new_callback = function (machine, name)
       processor = cbk,
     }
     nodestasksappendaction("processors",
-                           "characters",
+                           --"characters",
+                           -- this one is “for users” (cf. node-tsk.lua)
+                           "before",
                            "thirddata.enigma.callbacks." .. name)
+    nodes.tasks.disableaction("processors",
+                              "thirddata.enigma.callbacks." .. name)
   else
     enigma.callbacks[name] = cbk
   end
 end
 
---local teststring = [[B I II III 01 01 01]]
-enigma.new_machine = function (args, name)
+local configurations = { }
+local save_raw_args = function (conf, name)
+  local current = configurations[name] or { }
+  for k, v in next, conf do
+    current[k] = v
+  end
+  configurations[name] = current
+end
+local retrieve_raw_args = function (name)
+  local cn = configurations[name]
+  return cn and tablecopy(cn) or { }
+end
+enigma.save_raw_args     = save_raw_args
+enigma.retrieve_raw_args = retrieve_raw_args
+
+local new_machine = function (args, name)
   local machine = new(args.day_key, args.rotor_setting)
   machine.name  = name
   verbose_level = args.verbose
   return machine
-end --stub
+end
+
+enigma.new_machine  = new_machine
+enigma.new_callback = new_callback
 
 ------------------------------------------------------------------------
 
diff --git a/tex/context/third/enigma/t-enigma.mkvi b/tex/context/third/enigma/t-enigma.mkvi
index 7c01144..173bb07 100644
--- a/tex/context/third/enigma/t-enigma.mkvi
+++ b/tex/context/third/enigma/t-enigma.mkvi
@@ -49,12 +49,13 @@ thirddata = thirddata or { }
 %D on the internal mechanisms but implement our own macro generator.
 %D \stopparagraph
 
-\def\do_define_enigma#id{%
+\def\do_do_define_enigma#id{%
+  \edef\enigmaid{#id}%
   \expandafter\gdef\csname start\enigmaid\endcsname{%
+    \endgraf
     \bgroup
     \ctxlua{
       if thirddata.enigma.machines["#id"] then
-        local callback = thirddata.enigma.callbacks["#id"],
         nodes.tasks.enableaction("processors",
                                  "thirddata.enigma.callbacks.#id")
       else
@@ -64,6 +65,8 @@ thirddata = thirddata or { }
   }%
   %
   \expandafter\gdef\csname stop\enigmaid\endcsname{%
+    \endgraf%% We need to force a paragraph here for the callback to be
+            %% applied.
     \ctxlua{
       nodes.tasks.disableaction("processors",
                                 "thirddata.enigma.callbacks.#id")
@@ -73,28 +76,49 @@ thirddata = thirddata or { }
   }%
 }
 
-\def\defineenigma#id{%
-  \begingroup
-  \edef\enigmaid{#id}%
-  \expandafter\do_define_enigma\expandafter{\enigmaid}%
+\def\inherit_enigma#to#from{%
+  \ctxlua{%
+    local enigma = thirddata.enigma
+    local current_args = enigma.retrieve_raw_args(\!!bs#from\!!es)
+    enigma.new_callback(
+      enigma.new_machine(current_args, \!!bs#to\!!es), \!!bs#to\!!es
+    )
+  }%
+  \do_do_define_enigma{#to}%
+}
+
+\def\do_define_enigma[#id][#secondid]{%
+  \ifsecondargument %% Copy an existing machine and callback.
+    \inherit_enigma{#id}{#secondid}%
+  \else             %% Create a new machine.
+    \iffirstargument
+      \do_do_define_enigma{#id}%
+    \else
+      \donothing
+    \fi
+  \fi
   \endgroup%
 }
 
+\def\defineenigma{%
+  \begingroup
+  \dodoubleempty\do_define_enigma%
+}
+
 %D \stopdocsection
 
 %D \startdocsection[title=Setup]
-\def\do_setup_enigma#args{%
+\def\do_do_setup_enigma#args{%
     \ctxlua{
       local enigma = thirddata.enigma
       local current_args =
         enigma.parse_args([====[\detokenize{#args}]====])
+      enigma.save_raw_args(current_args, [====[\currentenigmaid]====])
       enigma.new_callback(
         enigma.new_machine(current_args,
                            [====[\currentenigmaid]====]),
         [====[\currentenigmaid]====])
     }%
-  \popcatcodetable
-  \egroup%
 }
 
 %D \startparagraph
@@ -102,12 +126,22 @@ thirddata = thirddata or { }
 %D All the logic is at the Lua end, not much to see here …
 %D \stopparagraph
 
-\def\setupenigma#id{%
-  \bgroup
+\def\do_setup_enigma[#id][#args]{%
+  \ifsecondargument
     \edef\currentenigmaid{#id}
     \pushcatcodetable
     \catcodetable \txtcatcodes
-    \do_setup_enigma%
+      \do_do_setup_enigma{#args}%
+  \else
+    \donothing
+  \fi
+  \popcatcodetable
+  \egroup%
+}
+
+\def\setupenigma{%
+  \bgroup
+  \dodoubleempty\do_setup_enigma%
 }
 
 %D \stopdocsection