November 2020 - ntg-context - NTG Mailing Lists

How does lua callback work?
by Sylvain Hubert 04 Nov '20

04 Nov '20

Dear List, I'm trying to intervene whenever context encounters a character that it cannot render in the current font. I guess this should have something to do with lua callbacks (pls correct me if I'm wrong), but the document <http://www.pragma-ade.nl/general/manuals/cld-mkiv.pdf> does not seem to elaborate on this. Does anyone know how the aforementioned task can be done, or how lua callbacks work in terms of the meaning of the concerned events and parameters? Thanks! Best, Sylvain

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How to draw a horizontal line of 0.5\paperwidth ?
by Sylvain Hubert 04 Nov '20

04 Nov '20

Dear List, I've tried \hl[0.5\paperwidth] but context complains 'a number should have been here' since \hl assumes 'em' as unit. Does anyone know how to draw a horizontal line of 0.5\paperwidth ? Thanks! Best, Sylvain

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context.delayed as parameter of setuphead[before=...]
by Sylvain Hubert 04 Nov '20

04 Nov '20

Dear List, I'm trying to mirror the context command `\setuphead[chapter][before=hello]` into lua with delayed typesetting of 'hello', but `\ctxlua{context.setuphead({'chapter'}, {before=context.delayed'hello'})}` does not have any effect. Could anyone help me on this? Thanks! Best, Sylvain

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How to really set the paper margin?
by Sylvain Hubert 04 Nov '20

04 Nov '20

Dear List, The following example results in a pdf that has a wide margin on both sides despite the \setuplayout : \showframe \setuppapersize[A4][A4] \setuplayout[margin=0cm, edge=0cm, margindistance=0cm, edgedistance=0cm] \starttext hello world \stoptext Does anyone know how to really set the paper margin? Thanks! Best, Sylvain

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caching remote images
by Jano Kula 04 Nov '20

04 Nov '20

Hello! I'd like to cache images (order of hundreds) from a remote location (not all the time mapped as drive, download speed and amount of data are also the factors). \usepath[dirfile://./resources/**] is likely for speeding up searching not downloading and I don't know when new images are available (when to delete dirlist.* files), as described in workflows-mkiv.pdf. Looks like the cache parameter in \externalfigure is used only if some conversion is going on. I could create a conversion which does nothing or only envelopes JPG in PDF as <id>.jpg.pdf (loading could be faster) and then: if cached file exists use cached <id>.jpg.pdf else if drive is mapped download, convert and cache <id>.jpg else skip file end end The source file with one <id> will never change or I could re-cache from time to time to have up-to-date images cached. Before reinventing the wheel: isn't such functionality or part of it already available? Thanks, Jano

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How to reproduce a particular head/title style
by Garulfo 03 Nov '20

03 Nov '20

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Adding built-in support for Serbian language
by Ivan Pešić 03 Nov '20

03 Nov '20

Hello all, I have recently started using ConTeXt. I've found that the distribution includes a proper (cyrillic) hyphenation file for Serbian language, but a complete language support is still not implemented. Therefore, I've added what I think is required, did some testing by putting changed files in my texmf-local, and the result looks fine. There is only one thing that requires a decision from the development team. Serbian language uses two scripts: cyrillic and latin. Context language codes are using 2 letters for identification. So I'm not sure how to include both scripts. What I'm sending now is a cyrillic script implementation, using the code "sr". It is trivial to generate (completely automatic) latin script version of these changes, once it is decided how to label it. Best regards, Ivan

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About filling paths, unfill, etc.
by Jairo A. del Rio 03 Nov '20

03 Nov '20

Hi everyone. I want to know if nowadays (2020) Metafun is able to do an actual unfill, like above: https://tex.stackexchange.com/questions/151068/how-can-i-fill-a-complex-pat… Example of what I want to do: \startMPpage path A, B, C; A := unitcircle shifted (-center unitcircle); A := A scaled 4cm; B := unitcircle shifted (-center unitcircle); B := B scaled 1cm; %C := (reverse B) shifted (left*1.4cm); %It works for two paths fill (reverse B)-- A -- cycle withcolor red; %fill A -- (reverse B) -- C -- cycle withcolor red; %When I try the same with three paths, a thin, unwanted line appears \stopMPpage I'm aware of unfill and I've read somewhere else about using pens instead, but I want to know if a better solution is possible. Thank you in advance. Regards, Jairo :)

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A syntax sugar for ConTeXt
by Sylvain Hubert 03 Nov '20

03 Nov '20

Dear List, I'm experimenting with a new syntax for ConTeXt and would appreciate it a lot if you could give some opinions/advice on it. https://github.com/champignoom/luax Details in the README. Basically it's lua code faking tex, while remaining a decent programming language, and saving keystrokes to the level of tex compared to \ctxlua -only codes A major motivating example is the table. There are multiple implementations of table inside and outside ConTeXt, each of which uses its own ad-hoc syntax, but at the end of the day they're just mimicking 2d arrays with some variations. Here's an example in Context an excursion <http://www.pragma-ade.com/general/manuals/ma-cb-en.pdf> using xtable sugared with the new syntax: ``` \xtable.setup[ split='yes', header='repeat', offset='4pt', ] \xtable[ head={ align='middle', foregroundstyle='bold', {{nx=6, "Decline of wealth in Dutch florine (Dfl)"}}, {foregroundstyle='bold', {width='1.2cm', 'Year'}, '1.000--2.000', '2.000--3.000', '3.000-5.000', '5.000-10.000', 'over 10.000'}, }, next={ {{nx=6, align='middle', foregroundstyle='bold', "Decline of wealth in Dutch florine (Dfl) / Continued"}}, {foregroundstyle='bold', {'Year', '1.000--2.000', '2.000--3.000', '3.000-5.000', '5.000-10.000', 'over 10.000'}}, }, body={ align='middle', {1675, \{\math{22}}, '~7', '~5', '~4', '~5'}, {1724, '~4', '~4', '--', '~4', '~3'}, }, ] ``` Best, Sylvain

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lmtx
by Hans Hagen 02 Nov '20

02 Nov '20

Hi, I might have uploaded a new version by accident so be careful when you update. Make a backup first. Sorry, The test suite compiles, which doesn't day all is ok as i just run it. There are no funcional changes, only a bit of conceptual reworking of some internals in the process of adapting to new features as well as protection, so \starttext \start \def\framed{oeps} \stop \stoptext is permitted, but when you run with context --overloadmode=warning you get a warning and with context --overloadmode=error the run aborts. Here is a user macro example: \frozen \def\foo{oeps} \def\foo{oeps} % warning or error \overloaded\def\foo{oeps} % okay eventually all system macros will be way more protected, being primitive, permanent, immutable to mention some of the possible properties. It's work in progress as you can imagine some pitfals and in order for it to work well quite some has to be flagged. Also, I have to play with some related additions. (This version also makes more extensive use of some new macro features but that's for later.) 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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