Re: \externalfigure locator

[Hans Hagen <pragma@wxs.nl>]

On 3/22/2017 9:30 AM, Procházka Lukáš Ing. wrote:
> 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.

manipulation plugins have been available for quite a while, just look 
into grph-con.lua for examples (the test suite has some converter 
examples too)

Hans

> 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
>>>
>>>
>>
>>
>
>


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