* Number of pages by Lua of a figure to be inserted?
@ 2013-04-10 14:22 Procházka Lukáš Ing. - Pontex s. r. o.
2013-04-10 15:38 ` Hans Hagen
0 siblings, 1 reply; 3+ messages in thread
From: Procházka Lukáš Ing. - Pontex s. r. o. @ 2013-04-10 14:22 UTC (permalink / raw)
To: ConTeXt
Hello,
I need to identify number of pages by Lua of an image which is to be inserted.
The image can be of all various types supported by Ctx - e.g. .png, .pdf.
I've been using the following code so far (based on a mailing thread in the past):
----
function nOfPages(fn)
local fig = figures.push{name = fn}
local info = figures.identify()
figures.check()
local n = fig.used.pages
figures.pop()
return n
end
----
But the code above break Ctx in the case that the image doesn't exist.
I'd need to modify the solution somehow so to return 'nil' or 'false' (or a error message) in the case the file was not found.
How to do it?
TIA.
Best regards,
Lukas
(NB: Still "ConTeXt ver: 2012.11.26 13:31 MKIV fmt: 2012.11.27 int: english/english".)
--
Ing. Lukáš Procházka [mailto:LPr@pontex.cz]
Pontex s. r. o. [mailto:pontex@pontex.cz] [http://www.pontex.cz]
Bezová 1658
147 14 Praha 4
Tel: +420 244 062 238
Fax: +420 244 461 038
___________________________________________________________________________________
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maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
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^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: Number of pages by Lua of a figure to be inserted?
2013-04-10 14:22 Number of pages by Lua of a figure to be inserted? Procházka Lukáš Ing. - Pontex s. r. o.
@ 2013-04-10 15:38 ` Hans Hagen
2013-04-11 7:10 ` Procházka Lukáš Ing. - Pontex s. r. o.
0 siblings, 1 reply; 3+ messages in thread
From: Hans Hagen @ 2013-04-10 15:38 UTC (permalink / raw)
To: mailing list for ConTeXt users
On 4/10/2013 4:22 PM, Procházka Lukáš Ing. - Pontex s. r. o. wrote:
> Hello,
>
> I need to identify number of pages by Lua of an image which is to be
> inserted.
>
> The image can be of all various types supported by Ctx - e.g. .png, .pdf.
>
> I've been using the following code so far (based on a mailing thread in
> the past):
>
> ----
> function nOfPages(fn)
> local fig = figures.push{name = fn}
> local info = figures.identify()
>
> figures.check()
>
> local n = fig.used.pages
inspect(fig)
> figures.pop()
>
> return n
> end
> ----
>
> But the code above break Ctx in the case that the image doesn't exist.
>
> I'd need to modify the solution somehow so to return 'nil' or 'false'
> (or a error message) in the case the file was not found.
>
> How to do it?
there's a status table in fig
Hans
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___________________________________________________________________________________
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___________________________________________________________________________________
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: Number of pages by Lua of a figure to be inserted?
2013-04-10 15:38 ` Hans Hagen
@ 2013-04-11 7:10 ` Procházka Lukáš Ing. - Pontex s. r. o.
0 siblings, 0 replies; 3+ messages in thread
From: Procházka Lukáš Ing. - Pontex s. r. o. @ 2013-04-11 7:10 UTC (permalink / raw)
To: ConTeXt
[-- Attachment #1: Type: text/plain, Size: 1941 bytes --]
Hello,
thanks for the hint.
Could you please check my code?
The function is able to detect number of pages (tested with a .pdf, which works; I believe it will work with other figure formats, too).
When the file is not found, it doesn't break Ctx, which is good.
The problem is that once a file is not found, later calls to the function fail (means they return 'false'), too.
It seems like a figure being "hanging" somewhere or what; but I'm not able to find the bad place iin the code.
Note that the directory structure is:
t2.mkiv - file to be tested
T/Kn.pdf - file to be inserted (2 pages)
---- t2.mkiv
\startluacode
nOfPages = function(fn)
local n
do
local fig = figures.push{name = fn}
local info = figures.identify()
--inspect(info)
if info.status.status ~= 0 then
figures.check() -- This may check all figures; I'm interested in the last figure only - any call improvement?
n = fig.used.pages
end
figures.pop() -- I thought no figure should stay "hanging" due to this line
end
if not n then return false end
return n
end
\stopluacode
\starttext
AAA
\startluacode
context(nOfPages("Kn.pdf") or "???") -- [1]
-- When you comment the line above, later Ctx detects correctly 2 pages of 'Kn.pdf'.
\stopluacode
\setupexternalfigures[directory=T] % Find the 'Kn.pdf' in 'T/Kn.pdf'
\startluacode
context(nOfPages("Kn.pdf") or "???")
-- Now, Ctx should find 'T/Kn.pdf' anyway and thus detect 2 pages of 'Kn.pdf'.
-- This doesn't occure when [1] is on
\stopluacode
\stoptext
----
Any idea?
TIA.
Best regards,
Lukas
--
Ing. Lukáš Procházka [mailto:LPr@pontex.cz]
Pontex s. r. o. [mailto:pontex@pontex.cz] [http://www.pontex.cz]
Bezová 1658
147 14 Praha 4
Tel: +420 244 062 238
Fax: +420 244 461 038
[-- Attachment #2: t2.zip --]
[-- Type: application/zip, Size: 12850 bytes --]
[-- Attachment #3: Type: text/plain, Size: 485 bytes --]
___________________________________________________________________________________
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
___________________________________________________________________________________
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2013-04-10 14:22 Number of pages by Lua of a figure to be inserted? Procházka Lukáš Ing. - Pontex s. r. o.
2013-04-10 15:38 ` Hans Hagen
2013-04-11 7:10 ` Procházka Lukáš Ing. - Pontex s. r. o.
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