Re: [NTG-context] linking to an external PDF file

8 Oct 2018

      On 10/8/18 10:09 AM, Hans van der Meer wrote:
...
I am embedding links to an URL in my documents. Although it is used in
XML-documents, you might be able to use the gist of this code that
generates a clickable link. Perhaps you find it useful. 
Many thanks for your reply, dr. Hans van der Meer.

Sorry, but I’m afraid I don’t see the way of generating an URL to a
non-external document in your code.

After all, the document is embedded in the PDF document itself.

Pablo
...
% Return the code when clicking the link.
\def\URIReturnCode#1{\ctxlua{tex.print(hvdm.urireturncode("#1"))}}
— Some Lua code needed:
-- Check URI
socket.http.TIMEOUT = 5-- set URI timeout in seconds
hvdm.urireturncode = function (theuri)
-- Differentiate between file and http protocols.
local first,last = string.find(theuri, "file://")
if first == nil then
-- We have http to search for.
local content, status, authinfo = socket.http.request{
method = "HEAD",
url = theuri,
}
return type(status) == "number" and status or "failure"
else
-- We must ascertain the existence of the file.
local thefile = io.open(string.sub(theuri, last+1, -1), "r")
if thefile then
io.close(thefile)
return "200"
else
return "404"
end
end
end
% ..... Place an url link
.....................................................
% BEWARE: spaces in file names must be %20 in the link !!!
% This global definition of the URLbase cannot be missed.
\def\THEURLBASE{http://}
% Signal the occurence of timeout on URI search.
\newif\ifURItimeout
\startxmlsetups xmlcommon:urlbase
\edef\THEURLBASE{\xmlstrippednolines{#1}{.}}
% Reset the URI timeout for new URLbase.
\global\URItimeoutfalse
\stopxmlsetups
\startxmlsetups xmlcommon:url
% Define the full uri.
\edef\theurl{\THEURLBASE\xmlatt{#1}{link}}
% File suffix should be one of the list.
\doifelse{\FileSuffixList{\xmlatt{#1}{link}}
{pdf,jpg,jpeg,html,png,tif,tiff}}{\empty}
{\def\suffix{.impossible}}% no suffix from the list here
{\def\suffix{\empty}}% one of the list is present
% First try link as given, beware of unreachable site.
\ifURItimeout
% For previously timeout on this site.
\else
\edef\returncode{\URIReturnCode{\theurl}}
\doif{\returncode}{failure}
{
\global\URItimeouttrue
\errorcall{#1}{url access fails for \THEURLBASE\xmlatt{#1}{link}}
}
\fi
% On URI timeout there is no hope to find the file.
\ifURItimeout
\else
% When there is no suffix from the list, try several.
\doifnot{\suffix}{\empty}
{
\scratchcounter=200\relax
\ifnum\returncode=\scratchcounter\else
\def\suffix{.pdf}
\edef\returncode{\URIReturnCode{\theurl\suffix}}
\fi
\ifnum\returncode=\scratchcounter\else
\def\suffix{.jpg}
\edef\returncode{\URIReturnCode{\theurl\suffix}}
\fi
\ifnum\returncode=\scratchcounter\else
\def\suffix{.jpeg}
\edef\returncode{\URIReturnCode{\theurl\suffix}}
\fi
\ifnum\returncode=\scratchcounter\else
\def\suffix{.html}
\edef\returncode{\URIReturnCode{\theurl\suffix}}
\fi
\ifnum\returncode=\scratchcounter\else
\def\suffix{.png}
\edef\returncode{\URIReturnCode{\theurl\suffix}}
\fi
\ifnum\returncode=\scratchcounter\else
\def\suffix{.tiff}
\edef\returncode{\URIReturnCode{\theurl\suffix}}
\fi
\ifnum\returncode=\scratchcounter\else
\def\suffix{.tif}
\edef\returncode{\URIReturnCode{\theurl\suffix}}
\fi
}
% Give up if returncode other then 200.
\ifnum\returncode=200\relax
% Page number might be added.
\doifelse{\xmlatt{#1}{page}}{\empty}
{\let\thep\empty}
{\edef\thep{\letterhash page=\xmlatt{#1}{page}}}
% Place the link, ref-attribute prevales in the presentation.
\doifelse{\xmlatt{#1}{ref}}{\empty}
{\edef\temp{\xmlatt{#1}{link}}}
{\edef\temp{\xmlatt{#1}{ref}}}
\goto
{\FirstLastCharacters{\temp}{\xmlatt{#1}{maxsize}}}
[url(\theurl\suffix\thep)]
\else
\errorcall{#1}
{\THEURLBASE\xmlatt{#1}{link} not found (\returncode)}
\fi
\fi% end of URItimeout
\stopxmlsetups
...
On 8 Oct 2018, at 00:39, Hans Hagen mailto:j.hagen@xs4all.nl> wrote:
On 10/7/2018 8:41 PM, Pablo Rodriguez wrote:
...
On 10/7/18 8:33 PM, Hans Hagen wrote:
...
On 10/7/2018 8:19 PM, Pablo Rodriguez wrote:
...
[...]
Is there a way to hyperlink to an attached document? I mean, no matter
whether it has been generated by ConTeXt or not.
i have no clue what you mean
Is there a way to link to a page or a destination (such as in
https://www.adobe.com/content/dam/acom/en/devnet/pdf/PDF32000_2008.pdf#page=...
or
https://www.adobe.com/content/dam/acom/en/devnet/pdf/PDF32000_2008.pdf#named...)
to a document that is attached (using \attachment) in ConTeXt?
I hope it is clear now,
it points to the media mess .. which relates to either or not obsolete
stuff (flash related)
anyway, i don't know as i never embed pdf docs and if i would i'd have
no reason to refer to them (it probably depends on a viewer extracting
the attachment, caching it and then providing access: it makes no
sense to waste time on features that are not supported or maybe only
by acrobat unless it's a well paid projects in which case throw away
code is a bit less waste of time because it brings foon on the table)
Hans
-- 
http://www.ousia.tk