From: Hans Hagen <pragma@wxs.nl>
To: mailing list for ConTeXt users <ntg-context@ntg.nl>
Subject: Re: Number of pages by Lua of a figure to be inserted?
Date: Wed, 10 Apr 2013 17:38:33 +0200 [thread overview]
Message-ID: <51658779.2060402@wxs.nl> (raw)
In-Reply-To: <op.wvbwvmr3tpjj8f@lpr>
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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next prev parent reply other threads:[~2013-04-10 15:38 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-04-10 14:22 Procházka Lukáš Ing. - Pontex s. r. o.
2013-04-10 15:38 ` Hans Hagen [this message]
2013-04-11 7:10 ` Procházka Lukáš Ing. - Pontex s. r. o.
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