Accessing inserts from Lua in LuaMetaTeX
Hi all, I'm trying to manipulate some inserts from Lua in LuaMetaTeX, and I'm having some problems that I'm not having with LuaTeX. First, how do I get an insert's class/type from the "insert" nodes on the page? With LuaTeX, the insert's class/type is the same as the subtype of the "ins" nodes, but the subtype of the "insert" nodes is always zero in LuaMetaTeX, so I'm not sure how to get the class/type. Second, how do I get the head of the insert box from Lua? With LuaTeX, from TeX you would use "\box<class>" and from Lua you can use "tex.box[<class>]". With LuaMetaTeX, you use "\insertbox<class>" from TeX, but I'm not sure how to get at the insert box from Lua. The context for both of these is that my module lua-widow-control sometimes moves a line containing footnotes to the next page, so I need to do some surgery to make sure that the "footnote marks" stay with the "footnote text". This is tricky but doable with LuaTeX, but I can't seem to get it to work with the new inserts in LuaMetaTeX, hence the above questions. Thanks, -- Max
On 8/15/2022 8:18 AM, Max Chernoff via ntg-context wrote:
Hi all,
I'm trying to manipulate some inserts from Lua in LuaMetaTeX, and I'm having some problems that I'm not having with LuaTeX.
First, how do I get an insert's class/type from the "insert" nodes on the page? With LuaTeX, the insert's class/type is the same as the subtype of the "ins" nodes, but the subtype of the "insert" nodes is always zero in LuaMetaTeX, so I'm not sure how to get the class/type.
Indeed, we don't use these boxes and registers because we run in \insertmode=2. This gives us more state info (i kept the old method around for now).
Second, how do I get the head of the insert box from Lua? With LuaTeX, from TeX you would use "\box<class>" and from Lua you can use "tex.box[<class>]". With LuaMetaTeX, you use "\insertbox<class>" from TeX, but I'm not sure how to get at the insert box from Lua.
tex.getinsertdistance tex.getinsertmultiplier tex.getinsertlimit tex.getinsertheight tex.getinsertdepth tex.getinsertwidth tex.getinsertcontent tex.setinsertdistance tex.setinsertmultiplier tex.setinsertlimit tex.setinsertcontent
The context for both of these is that my module lua-widow-control sometimes moves a line containing footnotes to the next page, so I need to do some surgery to make sure that the "footnote marks" stay with the "footnote text". This is tricky but doable with LuaTeX, but I can't seem to get it to work with the new inserts in LuaMetaTeX, hence the above questions. The insert (etc) handler is more clever and flexible. So, for instance we can bubble up inserts. I think you do a preroll so in that case you can set the migrations related parameter to not bubble up.
\starttext \holdingmigrations\numexpr1+2+4\relax \setbox0\hbox{test \footnote{test} test} \setbox2\vbox{\unhcopy0} \holdingmigrations0 \setbox4\vbox{\unhcopy0} \unhbox0 \unvbox2 \unvbox4 \stoptext But I have no clue how all that will work out with (lua) code that manipulates these things. In list nodes you can consult the pre and post fields to what got migrated. 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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Max Chernoff