Saving module data in tuc file

[Aditya Mahajan <adityam@umich.edu>]

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Hi,

How does one save and read third-party data in tuc file at the lua end?

I am trying to write a module t-ifchanged that defines a \doiffilechanged 
macro that provides the functionality of mtxrun --ifchanged without 
calling an external program (This is meant to be a support module for 
t-vim, where the external calls to mtxrun are too time consuming).

I can successfully write additional data to the tuc file, but cannot 
figure out how to initialize the data from tuc file. (See attached file). 
Any hints are welcome.


Aditya

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\startmodule[ifchanged]

\startluacode
  local collected = {}
  local tobesaved = {}

  local function initializer()
      -- this function is not called!
      -- print("<><><><><>",collected)
      collected = utilitydata.thirddata.ifchanged.collected
  end

  job.register('thirddata.ifchanged.collected', tobesaved, initializer)

  local function cachedmd5sum(filename)
      return collected[filename] or ""
  end

  function commands.doiffilechangedelse(filename)
    local md5sum = md5.HEX(io.loaddata(filename) or "")
    local cached = cachedmd5sum(filename)
    tobesaved[filename] = md5sum
    print(">>>>>>>>>>>>", md5sum)
    print("============", cached)
    commands.testcase(md5sum == cached)
  end

\stopluacode

\def\doiffilechangedelse#1%
    {\ctxcommand{doiffilechangedelse("#1")}}

\def\doiffilechanged#1%
    {\doiffilechangedelse{#1}\firstofoneargument\gobbleoneargument}

\def\doiffilenotchanged#1%
    {\doiffilechangedelse{#1}\gobbleoneargument\firstofoneargument}

\stopmodule

\starttext
\doiffilechanged{test.pdf}{\executesystemcommand{context test}}
\stoptext

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