[NTG-context] Number of pages by Lua of a figure to be inserted?

Hans Hagen pragma at wxs.nl
Wed Apr 10 17:38:33 CEST 2013


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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