Howto use the lua io.read() function only in the first context run?

Howto use the lua io.read() function only in the first context run?

[Romain Diss]

Hi all,

I want to write a cld document with some data read on the standard
input. I'm using the lua io.read() function but it's launched at every
context passes (depending on the case, it is launched 2 to 3 times).

-- Minimum not working example
local name = io.read()
context.startdocument()
context("Hello " .. name)
context.stopdocument()

Thanks in advance.

-- 
Romain Diss
___________________________________________________________________________________
If your question is of interest to others as well, please add an entry to the Wiki!

maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
webpage  : http://www.pragma-ade.nl / http://tex.aanhet.net
archive  : http://foundry.supelec.fr/projects/contextrev/
wiki     : http://contextgarden.net
___________________________________________________________________________________

Re: Howto use the lua io.read() function only in the first context run?

[Hans Hagen]

On 3/15/2016 9:04 PM, Romain Diss wrote:
> Hi all,
>
> I want to write a cld document with some data read on the standard
> input. I'm using the lua io.read() function but it's launched at every
> context passes (depending on the case, it is launched 2 to 3 times).
>
> -- Minimum not working example
> local name = io.read()
> context.startdocument()
> context("Hello " .. name)
> context.stopdocument()

you can test for environment.arguments.currentrun being "1"

-----------------------------------------------------------------
                                           Hans Hagen | PRAGMA ADE
               Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
       tel: 038 477 53 69 | www.pragma-ade.com | www.pragma-pod.nl
-----------------------------------------------------------------
___________________________________________________________________________________
If your question is of interest to others as well, please add an entry to the Wiki!

maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
webpage  : http://www.pragma-ade.nl / http://tex.aanhet.net
archive  : http://foundry.supelec.fr/projects/contextrev/
wiki     : http://contextgarden.net
___________________________________________________________________________________

Re: Howto use the lua io.read() function only in the first context run?

[Romain Diss]

Hi,

Le 15/03/2016, Hans Hagen a écrit
> On 3/15/2016 9:04 PM, Romain Diss wrote:
> >I want to write a cld document with some data read on the standard
> >input. I'm using the lua io.read() function but it's launched at every
> >context passes (depending on the case, it is launched 2 to 3 times).
> >
> >-- Minimum not working example
> >local name = io.read()
> >context.startdocument()
> >context("Hello " .. name)
> >context.stopdocument()
> 
> you can test for environment.arguments.currentrun being "1"

Thank you Hans... but it doesn't fully work. Now I only enter the input
once (that's ok) but on the second run, the variable is not defined
anymore. How can I keep it in the conTeXt memory?

-- Minimum still not working example
local name
if environment.arguments.currentrun == "1" then io.read() end
context.startdocument()
context("Hello " .. name)
context.stopdocument()

All the best

-- 
Romain Diss
___________________________________________________________________________________
If your question is of interest to others as well, please add an entry to the Wiki!

maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
webpage  : http://www.pragma-ade.nl / http://tex.aanhet.net
archive  : http://foundry.supelec.fr/projects/contextrev/
wiki     : http://contextgarden.net
___________________________________________________________________________________

Re: Howto use the lua io.read() function only in the first context run?

[Andreas Schneider]

Am 2016-03-16 22:47, schrieb Romain Diss:
> Hi,
> 
> Thank you Hans... but it doesn't fully work. Now I only enter the input
> once (that's ok) but on the second run, the variable is not defined
> anymore. How can I keep it in the conTeXt memory?
> 
> -- Minimum still not working example
> local name
> if environment.arguments.currentrun == "1" then io.read() end
> context.startdocument()
> context("Hello " .. name)
> context.stopdocument()
> 
> All the best

You can use the LUA interface "job.passes".
In the first pass, you store your value. For example:
local passdata = job.passes.define("mystuff") --I usually define this at 
the top of my script and reuse it.
passdata["somevalue"] = "hello world";

Then in the subsequent runs you can access
local lastpassdata = job.passes.getcollected("mystuff") --Same here...
print(lastpassdata["somevalue"])

Best regards,
Andreas
___________________________________________________________________________________
If your question is of interest to others as well, please add an entry to the Wiki!

maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
webpage  : http://www.pragma-ade.nl / http://tex.aanhet.net
archive  : http://foundry.supelec.fr/projects/contextrev/
wiki     : http://contextgarden.net
___________________________________________________________________________________

Re: Howto use the lua io.read() function only in the first context run?

[Hans Hagen]

On 3/16/2016 10:47 PM, Romain Diss wrote:
> Hi,
>
> Le 15/03/2016, Hans Hagen a écrit
>> On 3/15/2016 9:04 PM, Romain Diss wrote:
>>> I want to write a cld document with some data read on the standard
>>> input. I'm using the lua io.read() function but it's launched at every
>>> context passes (depending on the case, it is launched 2 to 3 times).
>>>
>>> -- Minimum not working example
>>> local name = io.read()
>>> context.startdocument()
>>> context("Hello " .. name)
>>> context.stopdocument()
>>
>> you can test for environment.arguments.currentrun being "1"

btw, there's also

    if tex.systemmodes["first"] then

> Thank you Hans... but it doesn't fully work. Now I only enter the input
> once (that's ok) but on the second run, the variable is not defined
> anymore. How can I keep it in the conTeXt memory?
>
> -- Minimum still not working example
> local name
> if environment.arguments.currentrun == "1" then io.read() end
> context.startdocument()
> context("Hello " .. name)
> context.stopdocument()

jobvariables.save("SomeName",value)

jobvariables.restore("SomeName")

beware, this also creates \SomeName

Hans

-----------------------------------------------------------------
                                           Hans Hagen | PRAGMA ADE
               Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
       tel: 038 477 53 69 | www.pragma-ade.com | www.pragma-pod.nl
-----------------------------------------------------------------
___________________________________________________________________________________
If your question is of interest to others as well, please add an entry to the Wiki!

maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
webpage  : http://www.pragma-ade.nl / http://tex.aanhet.net
archive  : http://foundry.supelec.fr/projects/contextrev/
wiki     : http://contextgarden.net
___________________________________________________________________________________