Saving module data in tuc file

Saving module data in tuc file

[Aditya Mahajan]

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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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Re: Saving module data in tuc file

[luigi scarso]

On Sun, Dec 4, 2011 at 1:20 AM, Aditya Mahajan <adityam@umich.edu> wrote:
> Hi,
>
> How does one save and read third-party data in tuc file at the lua end?
You can read the data with loadfile or dofile:
utilitydata=dofile('test.tuc')
and then you have the table stored into utilitydata
See for the difference with loadfile
http://www.lua.org/pil/8.html

-- 
luigi
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Re: Saving module data in tuc file

[Aditya Mahajan]

On Sun, 4 Dec 2011, luigi scarso wrote:

> On Sun, Dec 4, 2011 at 1:20 AM, Aditya Mahajan <adityam@umich.edu> wrote:
>> Hi,
>>
>> How does one save and read third-party data in tuc file at the lua end?
> You can read the data with loadfile or dofile:
> utilitydata=dofile('test.tuc')

But doesn't ConTeXt already read the tuc file at \starttext? I don't want 
to load the file again.

Aditya
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Re: Saving module data in tuc file

[Wolfgang Schuster]

Am 04.12.2011 um 01:20 schrieb Aditya Mahajan:

> 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.

\definetwopasslist{test}

\newcount\testcount

\starttext

\immediatesavetwopassdata{test}{}{First Entry}

One: \gettwopassdata{test}\twopassdata

\startluacode
commands.savetwopassdata("test","Second Entry")
\stopluacode

Two: \ctxlua{commands.gettwopassdata("test")}

\stoptext

Wolfgang
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Re: Saving module data in tuc file

[Hans Hagen]

On 4-12-2011 01:20, Aditya Mahajan wrote:
> 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).

This is why we have a mechanism built in (used for graphics).

> 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.

There is:

jobfiles.run("yourfile.xxx","vim --something yourfile.xxx")

I'll adapt this to accept a function as second argument.

Hans

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Re: Saving module data in tuc file

[Aditya Mahajan]

On Sun, 4 Dec 2011, Hans Hagen wrote:

> On 4-12-2011 01:20, Aditya Mahajan wrote:
>> 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).
>
> This is why we have a mechanism built in (used for graphics).

Ah, I didn't know that.

>> 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.
>
> There is:
>
> jobfiles.run("yourfile.xxx","vim --something yourfile.xxx")

This works in a standalone file, but not the way I am calling the 
function.


\def\executeCommand
     {\doifmode{*first}
         {\ctxlua{job.files.run(\!!bs\externalfiter::input_file\!!es,
                                \!!bs\externalfiltercommand\!!es)}}}


The solution is to remove the test for the first mode. Needs a bit of 
refactoring to ensure that the solution still works for MkII. (Does anyone 
use the filter module with MkII?)

Aditya
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Re: Saving module data in tuc file

[Aditya Mahajan]

On Sun, 4 Dec 2011, Aditya Mahajan wrote:

> \def\executeCommand
>    {\doifmode{*first}
>        {\ctxlua{job.files.run(\!!bs\externalfiter::input_file\!!es,
>                               \!!bs\externalfiltercommand\!!es)}}}
>
>
> The solution is to remove the test for the first mode. Needs a bit of 
> refactoring to ensure that the solution still works for MkII. (Does anyone 
> use the filter module with MkII?)

The new version of the filter module uses job.files.run in the background 
(when continue=yes is set) instead of mtxrun --ifchanged. This should 
considerably speed up the vim module when using a lot of code snippets.

Aditya
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