Re: \externalfigure locator

From: "Procházka Lukáš Ing." <LPr@pontex.cz>
To: ConTeXt <ntg-context@ntg.nl>
Subject: Re: \externalfigure locator
Date: Wed, 22 Mar 2017 09:30:04 +0100	[thread overview]
Message-ID: <op.yxhtwejc3h68c7@lprx> (raw)
In-Reply-To: <op.yxfxd4kt3h68c7@lprx>

Hello,

a bit surprisingly no response so far.

Does it mean that no such a function exists?

If so, are there any Lua tables which provide list of current searching paths and list of image extensions which ConTeXt handles? (In both cases: in the place of use, as e.g. list of paths may change during use of \(setup)externalfigure(s) at various places in the source document.)

Joseph mentioned 'figures.path' for paths;
is there something similar for valid image extensions (like figures.extensions')?

If not, would it be possible to provide something like this?

- Just to explain: I need to perform some ops before inserting an image via \externalfigure. And I would need to be able to locate the file to be inserted, even when the picture is inserted by just a file name (with no path) with path specified before by \setupexternalfigures.

Best regards,

Lukas

On Tue, 21 Mar 2017 08:50:18 +0100, Procházka Lukáš Ing. <LPr@pontex.cz> wrote:

> Hello Joseph,
>
> thank you for reaction.
>
> I guess:
>
> - "figures.path' is a ConTeXt variable, is it?
> - There are more extensions possible, not only .pdf. So how to access other extensions Ctx is to manage?
> - I guess that 'lpdf.epdf.load(figure_file)' is just a .pdf loader - how to load other pics (like .png, .jpg, .svg...)?
>
> Best regards,
>
> Lukas
>
>
> On Mon, 20 Mar 2017 09:34:19 +0100, <josephcanedo@gmail.com> wrote:
>
>> Hi,
>>
>> Personally I use the lua variable named : figures.path
>>
>> It’s a lua table which contains directories names you provide in directory= in \setupexternalfigures:
>>
>> for _, path in ipairs(figures.paths) do
>>      local figure_file = path .. '/' .. file
>>       local doc = lpdf.epdf.load(figure_file)  -- assume pdf (just an example)
>>      if doc then
>>           ….
>>      end
>> done
>>
>> There are perhaps helper functions as well.
>>
>> Joseph
>>
>> De : Procházka Lukáš Ing.
>> Envoyé le :lundi 20 mars 2017 09:27
>> À : ConTeXt
>> Objet :[NTG-context] \externalfigure locator
>>
>> Hello,
>>
>> is there a Lua version of external figure locator used by \externalfigure?
>>
>> Suppose having:
>>
>> ----
>> \setupexternalfigures[location={default,local,global},directory={../../Pics}]
>> \externalfigure[mill]                % Finds e.g. in d:\Ctx-Beta\tex\texmf-context\tex\context\sample\common\mill.png
>> \externalfigure[MyPrettyPicture.jpg] % Finds e.g. in c:\Lukas\Pics\MyPrettyPicture.jpg
>> ----
>>
>> And I need a function like:
>>
>> ----
>> \startluacode
>>    local path
>>
>>    path = assert(ExternalFileLocator("mill") == "d:/Ctx-Beta/tex/texmf-context/tex/context/sample/common/mill.png")
>>    path = assert(ExternalFileLocator("MyPrettyPicture.jpg") == "c:/Lukas/Pics/MyPrettyPicture.jpg")
>> \stopluacode
>> ----
>>
>> So what to use in place of "ExternalFileLocator()"?
>>
>> TIA.
>>
>> Best regards,
>>
>> Lukas
>>
>>
>
>

-- 
Ing. Lukáš Procházka | mailto:LPr@pontex.cz
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