November 2020 - ntg-context - NTG Mailing Lists

MP background for text typeset by \typefile
by context＠vivaldi.net 05 Nov '20

05 Nov '20

Hello, is there a way to draw custom background (via MP) to a text typed by \typefile, which is so long so it spreads over more pages? - I'm asking because I know how to typeset some text via \typefile with: 1. this: \definetyping[Test] [before={\startbackground[background=color,backgroundcolor=blue] }, after={\stopbackground }, ] - which creates a rectangular backround to the text, and the text may spread over pages; 2. or this: \defineoverlay[AnOverlayDefinition][] \definetyping[Test] [before={\startframedtext[background=AnOverlayDefinition, ]% }, after={\stopframedtext }, ] - which allows to define a custom background via overlay/MP, but which encloses the text to be typeset into a framed, and thus doesn't spread over pages. My intention is to "decore" the text typed by \typefile with a "fuzzy" background, which uses overlay/MP. But I am in the sitaution where I am able to figure out MP code just when the text is to be enclosed into \framed. Is it possible to combine both cases? How? Best regards, Lukas

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\blank[] doesn't work when nothing precedes it
by Sylvain Hubert 05 Nov '20

05 Nov '20

Dear List, I'm trying to put the document title at around .25\paperheight by inserting a \blank: \setuplayout[topspace=0cm, header=0cm, height=\paperheight] \starttext \blank[.25\paperheight] foo \stoptext But the "foo" still appears at the very top. Does anyone know why it behaves like that, or whether there is a more authentic way to put the first word at .25\paperwidth than inserting a tiny invisible space before the \blank? Thanks! Best, Sylvain

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Bug: context/mtxrun makes Firefox eat up cpu
by Sylvain Hubert 05 Nov '20

05 Nov '20

Hi, sorry if this is not the best place to file a bug but I found no working bug tracker for context. Environment: Manjaro 20.1.2, context 2020.09.20 23:02, firefox 82.0 Step to reproduce: 1. `firefox --safe-mode # start firefox without add-ons` 2.a`context --version # or --help, or without arguments` 2.b or: `mtxrun --script font --list --all` Expected behavior: Nothing surprising should happen. Actual behavior: Firefox suddenly eats 100% of cpu I've noticed that `context` symlinks to `luametatex`, but the latter itself does not trigger the bug, neither do `luatex` or `latex`, so I believe this is a context-specific thing. Best, Sylvain

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About loading C libraries (again)
by Jairo A. del Rio 05 Nov '20

05 Nov '20

Hi. I've just read in the LuaMetaTeX manual that --permitloadlib allows loading compiled (.so/.dll) libraries. However, when I try it using ConTeXt I have an error message (example below): %hello.tex \starttext \startluacode local hello = require"hellolib" -- hellolib.so context(hello.helloworld()) \stopluacode \stoptext %hello.c #include <lua.h> #include <lauxlib.h> static int helloworld (lua_State *L) { char hello[] = "Hello world!"; lua_pushstring(L, hello); return 1; } static const struct luaL_Reg hellolib [] = { {"helloworld", helloworld}, {NULL, NULL} }; int luaopen_hellolib (lua_State *L){ luaL_newlib(L, hellolib); return 1; } error (lua loadlib): you can only load external libraries when --permitloadlib is given On the other hand, manually calling LuaMetaTeX with the ConTeXt format and --permitloadlib gives the expected result (in this case, a "Hello world!"). How is the correct way to load those libraries? Thank you very much and sorry if my question seems to be weird. Best regards, Jairo :)

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What does --errors and --noconsole do?
by Sylvain Hubert 04 Nov '20

04 Nov '20

Dear List, I was reading workflow-mkiv <http://www.pragma-ade.nl/general/manuals/workflows-mkiv.pdf> and have found the '--errors' and '--noconsole' arguments which seemed quite helpful since, according to the documentation, "show errors at the end of a run" and "disables logging to the console" while "error reporting mentioned in the previous section will never be silenced". But when I run 'context --errors' for the following document \setuppagenumbering[footer] \starttext hi \stoptext the message setup > error in line 1, namespace 'pagenumbering', key 'footer,' still lies in the middle of a bunch of messages and is not shown in the end. When I add '--noconsole' to the arguments, the error disappears along with all the other messages. So is there any combination of arguments that can let context only display what matters to the user? Thanks in advance. Best, Syiain

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French spacing in ConTeXt
by Tomas Hala 04 Nov '20

04 Nov '20

Hi all, the following code works for the default roman family but not for tt-family. \setuplayout[width=30cc,height=70cc,topspace=0cc] \def\sample{\input knuth \par\thinrule\par} \starttext \setuplanguage[en][spacing=packed] \mainlanguage[en] \sample \setuplanguage[en][spacing=broad] \mainlanguage[en] \sample \tt \setuplanguage[en][spacing=packed] \mainlanguage[en] \sample \setuplanguage[en][spacing=broad] \mainlanguage[en] \sample \stoptext As far as I know, the broad spacing (=non-frenchspacing) should work also for typewriter. How could I enable it? Best wishes, Tomáš P. S. LaTeX code (only for comparison) works for both: \documentclass{article} \begin{document} \frenchspacing \input knuth \nonfrenchspacing \input knuth \tt \frenchspacing \input knuth \nonfrenchspacing \input knuth \end{document}

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cannot update LMTX
by Pablo Rodriguez 04 Nov '20

04 Nov '20

Dear list, after latest from 2020.09.20, I afraid I get this error when running install.sh on Linux or install.bat on Windows (both 64bit): mtx-install | updating tex/texmf, 1541 files mtx-install | updating tex/texmf-context, 3757 files mtx-install | changed : 0 % : 24110 : tex/texmf-context/context/data/scite/context/lexers/data/scite-context-data-context.lua mtx-install | tex/texmf-context/context/data/scite/context/lexers/data/scite-context-data-context.lua, trying again: mtx-install | changed : 0 % : 24110 : tex/texmf-context/context/data/scite/context/lexers/data/scite-context-data-context.lua mtx-install | tex/texmf-context/context/data/scite/context/lexers/data/scite-context-data-context.lua, trying again: mtx-install | changed : 0 % : 24110 : tex/texmf-context/context/data/scite/context/lexers/data/scite-context-data-context.lua mtx-install | tex/texmf-context/context/data/scite/context/lexers/data/scite-context-data-context.lua, trying again: mtx-install | changed : 0 % : 24110 : tex/texmf-context/context/data/scite/context/lexers/data/scite-context-data-context.lua mtx-install | tex/texmf-context/context/data/scite/context/lexers/data/scite-context-data-context.lua, trying again: mtx-install | changed : 0 % : 24110 : tex/texmf-context/context/data/scite/context/lexers/data/scite-context-data-context.lua mtx-install | tex/texmf-context/context/data/scite/context/lexers/data/scite-context-data-context.lua, try again later: If you want to run ConTeXt everywhere, you need to adapt the path, like: I don’t know what has changed to prevent the update. Could anyone confirm this issue with current LMTX? Many thanks for your help, Pablo -- http://www.ousia.tk

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Is there any intuitive way of handling missing characters?
by Sylvain Hubert 04 Nov '20

04 Nov '20

Dear List, Is there any way to give a sequence of fonts to context and let it try one after another in case of missing characters? Ideally it should be something like \usefallback[font1,font2,font3,...] The methods I've found are all way too complicated for someone who does not really care about fine-grained control over unicode coverage or customizing a typeface with different serif/sans/math/... combinations from different typefaces. Thanks! Best, Sylvain

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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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