August 2018 - dev-luatex - NTG Mailing Lists

Luatex 1.08.0 announcement
by luigi scarso 28 Oct '19

28 Oct '19

============================================================== LuaTeX 1.08 2018-08-28 ============================================================== (1) This release is a prelude to 1.10, the next stable iteration of LuaTeX after version 1.00. (2) Lua 5.3 is now considered to be default and we might use 5.4 in version 1.10. There are no real functional changed expected. You still need to rename the binary for 5.3! (3) Binary mode is no longer available in MPlib but it is still available in stand alone MetaPost. This simplifies compilation and reduces dependencies. (4) The dependency on Poppler for pdf image inclusion has been removed. We now use a small dedicated library written by Pawel Jakowski. We no longer need c++ compilers. We're in the process of making it behave well on all platforms. It has been tested on intel platforms. (5) We know that there can be some (alignment) issues with the arm platform but these are looked into. Therefore, later this year we will release 1.09. Version 1.10 is planned for TeXlive. We hope that ffi works ok on intel and arm platforms at that point. (6) There have been some extensions to the Lua libraries and some callbacks have been added. Also, a few new primitives have been introduced. The documentation mentions the stable extensions. (7) There are the usual bug fixes and cleanups but there have been no real fundamental changes in the API. The LuaTeX team

2 5

Re: [Dev-luatex] nodelist based tex.saveboxresource
by Hans Hagen 17 Aug '18

17 Aug '18

On 8/7/2018 7:23 AM, Marcel Krüger wrote: > ---- On Fri, 03 Aug 2018 15:51:24 +0200 Hans Hagen <j.hagen(a)xs4all.nl> wrote ---- > > On 8/3/2018 1:09 AM, Marcel Krüger wrote: > > > Hello, > > > > > > I want to suggest extending the tex.saveboxresource interface to accept a hlist or vlist node as an alternative to a box number as first argument. > > > Currently creating a boxresource from Lua node list requires saving the list in a TeX box register, only to delete that register again by tex.saveboxresource. > > > A direct way to transform a h/vlist into a boxresource would make such code easier and avoid potential side effects from changing the TeX registers. > > > An experimental patch with a suggested implementation is attached. > > > > ok, makes sense (but not entirely ok that way but i can fix it) > > > > > I also attached a patch implementing a node.scan method which I think would be another nice addition for LuaTeX: It scans a box with rules similar to `\setbox0` > > > and returns the node. This allows passing box-like material to LuaTeX without requiring box registers. > > > > this is tricky stuff so i need to have a close look at side effects > > (it's also more relatex to token scanning so belongs in another namespace) > > > > i'll have a go at it > > Thank you very much. Just so you know while testing the new changes I noticed that the current trunk generates a warning > > warning (pdf backend): dangling objects discarded > > for *every* non-empty document. I'm checking some backend issues and in the process that can happen. If trunk generates that then it's something else triggering it. Experimental is just that: experimental and things can change there stuff showing up there can even go. Also, if something is not documented, then don't use it. (This dangling is something i noticed and will be fixed, in addition to a possible accessor.) > Anyway there is another maybe more controversial feature I would like to see in LuaTeX: Could you add a callback replacing the built-in `do_delimiter`? > This would allow creating big delimiter in more flexible ways than just stacking boxes, especially I think about drawing custom-size delimiters using mplib > I am aware that this could be archieved by using the `mlist_to_hlist` callback but I think experimenting with delimiter construction should not require rewriting the entire mathlist conversion in Lua. Won't happen. For such fundamental extensions, changes, patches, adaptions one can use lua. In fact, drawing delimiters with e.g. mp can already be done for many years. It really makes no sense to replace each bit. We're now more than a decade in luatex and imo we can do whatever we want to extend in lua now. Also, given history it's nearly impossible to get an agreement on extensions that have hard coded behaviour. Probably the only bit that might evolve a bit is cleaning up the backend. (And I might start experimenting with a stripped down luatex follow up for context some day.) > Another option might be adding a `<function>` argument to node.mlist_to_hlist which, when not nil, is called to create delimiters. Won't happen either. Basically we're now at a stage where there will be no more extensions added. If needed there will be more parameters to replace hard coded values, but that's it. 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 -----------------------------------------------------------------

2 6

Re: [Dev-luatex] nodelist based tex.saveboxresource
by Marcel Krüger 17 Aug '18

17 Aug '18

---- On Fri, 17 Aug 2018 10:08:13 +0200 Hans Hagen <j.hagen(a)xs4all.nl> wrote ---- > Hi, > > Just a note: you use experimental but experimental is actually there for > me and luigi as communication channel. It happens to be public but > that's a side effect. It's unsupported, and things can come and go. Thanks for the note. I mostly use a setup to easily switch between multiple installed versions, so I mostly use the last TeX Live version (or trunk) for anything important and only use experimental when experimenting, so things coming and going is not that much of a concern. But I keep this in mind and will also avoid writing to the list about the smaller bugs in there if it is that unsupported. Also thank you and luigi very much for all your great work on LuaTeX. Best regards Marcel

1 0

Fix PDF whatsits
by Marcel Krüger 14 Aug '18

14 Aug '18

Hello, I attached a little patch to avoid SEGFAULTs when the backend encounters `pdf_annot`, `pdf_start_link`, `pdf_dest` or `pdf_thread` whatsits. The SEGFAULT was introduced in revision 6738. I also noticed that there is no backend support for pdf_start_thread nodes, so using `\pdfextension startthread` leads to ! error: (pdf backend): no output function for whatsit pdf_start_thread Maybe a note about this could be added to the documentation? Best regards Marcel Krüger

2 1

mruby
by fab1an 08 Aug '18

08 Aug '18

Hello, Is possible using mruby on Latex? for example https://github.com/matsumotory/mruby-on-Lua How to do this? Is this dificult?

2 1

Bug in lua_nodelib_new
by Marcel Krüger 07 Aug '18

07 Aug '18

Hi, the command `node.new('whatsit', '...')` with a string subtype currently always triggers the error creating a whatsit requires the subtype number as a second argument It can be fixed with the attached patch. Best regards Marcel

1 0

nodelist based tex.saveboxresource
by Marcel Krüger 05 Aug '18

05 Aug '18

Hello, I want to suggest extending the tex.saveboxresource interface to accept a hlist or vlist node as an alternative to a box number as first argument. Currently creating a boxresource from Lua node list requires saving the list in a TeX box register, only to delete that register again by tex.saveboxresource. A direct way to transform a h/vlist into a boxresource would make such code easier and avoid potential side effects from changing the TeX registers. An experimental patch with a suggested implementation is attached. I also attached a patch implementing a node.scan method which I think would be another nice addition for LuaTeX: It scans a box with rules similar to `\setbox0` and returns the node. This allows passing box-like material to LuaTeX without requiring box registers. Best regards Marcel

4 4