- ntg-context - Mailing Lists

two nested \mathbin command changes spacing
by Ulrike Fischer 17 May '18

17 May '18

In the following document the second a is much nearer placed to the V: \starttext $V \mathbin{a} W \qquad V \mathbin{\mathbin{a}} W $ \stoptext (in the second case an italic kern seems to be missing) Can one avoid this side effect of nested \math-command? When building symbols it is not always easy to avoid such nestings. -- Ulrike Fischer http://www.troubleshooting-tex.de/

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roadmap
by Hans Hagen 17 May '18

17 May '18

Hi, The ConTeXt meeting is - as usual - the right place and moment to discuss the roadmap. We never had real binding roadmaps, more informal ones. Anyway, here are some thoughts on the two main components: MkIV and LuaTeX. ConTeXt MkIV: - Check if some mechanism can (by now) be simplified due to LuaTeX extension introduced the last few years that can be considered stable by now. This has a low impact as we already use Lua a lot. - Figure out what mechanism in ConTeXt are bottlenecks in performance if there are such bottlenecks at all. We need user input on this. - Get rid of inconsistencies in the user interface e.g. by introducing new commands with settings. - Check what additional features users want (miss) and decide to what extent and with what priority we will put effort in this. We've reached a point where interference prevents more complex extensions. - Try to improve tricky mechanisms, like columns and tables. Improvements are of course always on the agenda. - We can add more trickery for fonts and scripts. There are some pending extensions. - Maybe we should provide a few more general styles. - Are there reasonable challenges left. LuaTeX 1.09: - This version is pretty close to what is the final version (seen from the functional point of view). We're still debating where to move after this. LuaTeX 2.0? A stripped down (lean and mean) version specific for ConTeXt? Keep in mind that we cannot fundamentally change something, even if we want to, because other macro packages use it and don't expect it to change much. - There will probably be some more options in controlling math (given issues with fonts). We have to accept that not everything has a generic programmable solution (which is why we have Lua on board). - There might be a few more callbacks but probably nothing fundamental is planned. - We keep cleaning up the code base (less code is better, less dependencies too, some documentation is missing or not yet adapted to the new code). For instance the pdf inclusion code will soon be redone (and then tested in the ConTeXt distribution as usual). - When possible we will try to improve performance but there is not much to gain to be expected there. - We will also keep up with Lua (currently 5.3, some day 5.4). It is unclear to what extent LuaJit follows. When it stays behind we need to decide if support in ConTeXt will stay (to some extent we can have dual code paths as we have now). - We expect the ffi interface to external libraries to become more stable over time. ConTeXt will not introduce dependencies (what can be done in Lua will happen in Lua) but on the other hand we might put some libraries in the distribution e.g. for database support. - We might add some extensions to MetaPost in MPLib. In addition we could formulate ideas with respect to the distribution, garden, documentation and so on. You can react on this list but if you come to the meeting, you can participate in discussions. So far for now, Hans ----------------------------------------------------------------- Hans Hagen | PRAGMA ADE Ridderstraat 27 | 8061 GH Hasselt | The Netherlands tel: 038 477 53 69 | www.pragma-ade.nl | www.pragma-pod.nl -----------------------------------------------------------------

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libcurl via FFI
by Henri Menke 17 May '18

17 May '18

Dear list, As announced in another thread, here a better annotated example of using libcurl via FFI in ConTeXt, see attached. On my old laptop: context: 3.482 seconds context --jit: 2.742 seconds context --jiton: 2.693 seconds Cheers, Henri

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Files on a server
by Hans van der Meer 17 May '18

17 May '18

I tried to determine the existence of a file on the internet. See the following macro call: % Test if file exists. \edef\theurl{\linkprotocol://\urlbase\xmlatt{#1}{link}\thesuffix} \doiffileelse {\theurl} {\verbose{HVDM-PEV-TEST}{file exists: \theurl}} {\verbose{HVDM-PEV-TEST}{file does not exist: \theurl}} It seems that \doiffileelse always results in true except for local files where nonexistence is correctly handled. For example the following url definitely does not exist but nevertheless \doiffileelse reports its existence: HVDM-PEV-TEST > file exists: http://hansvandermeer.myqnapcloud.com/archive/denhaag/hga-dtb-1869-6040.pdf Is it possible that the \doiffile macros are extended for files on the internet or a correponding set \doifurl is developed? Hans van der Meer

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Fwd: Re: roadmap
by Hans Hagen 16 May '18

16 May '18

-------- Forwarded Message -------- Subject: Re: [NTG-context] roadmap Date: Wed, 16 May 2018 17:37:30 +0200 From: Hans Hagen <j.hagen(a)xs4all.nl> To: Pablo Rodriguez <oinos(a)gmx.es> On 5/16/2018 5:18 PM, Pablo Rodriguez wrote: > On 05/15/2018 11:26 PM, Hans Hagen wrote: >> On 5/15/2018 9:17 PM, Pablo Rodriguez wrote: >>> [...] >>> Hans, >>> >>> I wonder whether it would be possible to implement a feature that you >>> mentioned in the past. >>> >>> In order to avoid widow and orphan lines, you mentioned that it would be >>> possible to automatically adapt the interline space for the page, so >>> that it may have one more line to avoid orphans (when interline space is >>> decreased) or it may move a line to the next page to avoid widows >>> (increasing the interline space in the present page). >>> >>> Would it be possible to add this feature to ConTeXt? >> >> actually it was something that came up when talking with Hermann Zapf >> years ago: he suggested to just vertically scale the text area (i >> actully implemented that an hour later) ... his opinion was that only a >> very small percentage of readers will notice (at that time we did >> experiments with hz, the expansion in pdftex: in fact nobody noticed >> that too, real interesting was that texies commented on all kind of >> things related to how tex is supposed to work: a clear demonstration >> that the average user knows what the virtues of tex are but not really >> sees it) > > I must confess that I can recognize hanging characters, but quality > expansion is impossible to see (at least, for me). > > I would even say that if expansion can be seen by a human reader, the > results will be crappy. > > How can I use the vertical scale feature to prevent widows and orphans? not now ... it was a mkii experiment more than a decade ago Hans ----------------------------------------------------------------- Hans Hagen | PRAGMA ADE Ridderstraat 27 | 8061 GH Hasselt | The Netherlands tel: 038 477 53 69 | www.pragma-ade.nl | www.pragma-pod.nl -----------------------------------------------------------------

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Re: [NTG-context] roadmap
by Christoph Reller 15 May '18

15 May '18

On Tue, 15 May 2018 08:23:04 +0200 luigi scarso <luigi.scarso(a)gmail.com> wrote: > > On Tue, May 15, 2018 at 8:15 AM, Christoph Reller < > christoph.reller(a)gmail.com> wrote: > > > > > Our company is producing (and weekly updating) 67 manuals and > > technical documents from more than 900 ConTeXt source files for our > > software products. The output PDFs are converted to PDF/A-2a, which is > > only possible due to ConTeXt's tagging. > > > What do you think of verapdf ? > Well, verapdf is only a validator and not a converter. And, by the way, there is no reasonable way to convert from, say, PDF/A-2b to PDF/A-2a without a rediculous amount of AI or manual input because the tagging cannot be created out of the blue. It has to be there from the document's birth. This is what makes this ConTeXt feature so precious. Cheers, Christoph >

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Re: [NTG-context] roadmap
by Christoph Reller 15 May '18

15 May '18

On Tue, May 15, 2018 at 12:53 AM, <ntg-context-request(a)ntg.nl> wrote: > > > Message: 3 > Date: Mon, 14 May 2018 23:26:28 +0200 > From: Hans Hagen <j.hagen(a)xs4all.nl> > To: Henning Hraban Ramm <texml(a)fiee.net>, mailing list for ConTeXt > users <ntg-context(a)ntg.nl> > Subject: Re: [NTG-context] roadmap > Message-ID: <c504ea08-a021-4444-4eba-c2894d72da52(a)xs4all.nl> > Content-Type: text/plain; charset=utf-8; format=flowed > > On 5/14/2018 9:36 PM, Henning Hraban Ramm wrote: > > Hi Hans, thank you so much! Keep up the good work! > > * PDF/* (X, A, UA - probably only reasonable with external tools, but it seems like there’s not a lot that’s usable) > > we support various formats (to some extend the backend even adapts to > it) ... tagged pdf ... already there for quite a while but i never had > any demand for it so i never really check the current state (also > because imo it's a it weird feature ... only there because publishers > don't want to distribute sources that are suitable for rendering > variations ... so we're stuck with some pseudo structure related to > visuals) > > (i might upgrade tagging and exports as they closely relate but it's not > easy to get motivated for something that one has no real use for so at > most it will cold winter evening stuff) To us, tagged PDF is important. Specifically, for PDF/A with compliance level a, tagging is mandatory. ConTeXt is the only (!) TeX-based PDF creation suite that can produce correct and reliable tagging. Our company is producing (and weekly updating) 67 manuals and technical documents from more than 900 ConTeXt source files for our software products. The output PDFs are converted to PDF/A-2a, which is only possible due to ConTeXt's tagging. >From what we hear of our customers, PDF/A level a and PDF/UA are becoming increasingly important, be it because of archiving issues or because of legislation requirements. So please, maintain this invaluable feature! Cheers, and thank you for all the effort. Christoph

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luatex hangs with \placebookmarks
by Joseph Canedo 12 May '18

12 May '18

Dear list, I use $ context --version mtx-context | ConTeXt Process Management 1.02 mtx-context | current version: 2018.04.19 15:53 With this simple attached MWE, I have luatex hanging in run 3. No idea what I am doing wrong. In other cases I get a lua error (could not write a MWE yet that reproduces this) : lua error > lua error on line 0 in file : ...est/tex/texmf-context/tex/context/base/mkiv/lpdf-ano.lua:292: attempt to index a nil value Thanks a lot Best regards Joseph

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embolden a font
by Ulrike Fischer 12 May '18

12 May '18

Is there anywhere an option to get an embolden effect as with the following pdf literal? I found the extend option but it doesn't give the intended look \starttext \font\test={Arial:mode=node;script=latn;language=DFLT;+tlig;} \test abc \pdfextension literal direct {2 Tr 0.15 w}% abc \pdfextension literal direct {0 Tr 0 w}% \font\test={Arial:mode=node;script=latn;language=DFLT;+tlig;extend=1.1} \test abc \stoptext -- Ulrike Fischer http://www.troubleshooting-tex.de/

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packslashes not working in latest beta
by Pablo Rodriguez 12 May '18

12 May '18

Dear list, I have the following sample: \enabledirectives[hyphenators.urls.packslashes] \starttext \hsize\zeropoint \hyphenatedurl{http://www.pragma-ade.com} \stoptext Using latest beta (2018.04.19 15:53), the directive doesn’t seem to work. (The two contiguous slashes are placed in different lines.) Can anyone confirm this? Many thanks for your help, Pablo -- http://www.ousia.tk

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