\externalfigure locator

\externalfigure locator

[Procházka Lukáš Ing.]

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
Pontex s. r. o.      | mailto:pontex@pontex.cz | http://www.pontex.cz | IDDS:nrpt3sn
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Re: \externalfigure locator

[Procházka Lukáš Ing.]

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
Pontex s. r. o.      | mailto:pontex@pontex.cz | http://www.pontex.cz | IDDS:nrpt3sn
Bezová 1658
147 14 Praha 4

Tel: +420 241 096 751 (+420 720 951 172)
Fax: +420 244 461 038

___________________________________________________________________________________
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://context.aanhet.net
archive  : https://bitbucket.org/phg/context-mirror/commits/
wiki     : http://contextgarden.net
___________________________________________________________________________________

Re: \externalfigure locator

[Procházka Lukáš Ing.]

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
Pontex s. r. o.      | mailto:pontex@pontex.cz | http://www.pontex.cz | IDDS:nrpt3sn
Bezová 1658
147 14 Praha 4

Tel: +420 241 096 751 (+420 720 951 172)
Fax: +420 244 461 038

___________________________________________________________________________________
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://context.aanhet.net
archive  : https://bitbucket.org/phg/context-mirror/commits/
wiki     : http://contextgarden.net
___________________________________________________________________________________

Re: \externalfigure locator

[Hans Hagen]

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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___________________________________________________________________________________
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://context.aanhet.net
archive  : https://bitbucket.org/phg/context-mirror/commits/
wiki     : http://contextgarden.net
___________________________________________________________________________________