Re: is it possible to have first and last line numbers from page?

["Pablo Rodríguez" <oinos@web.de>]

On 06/03/12 19:48, luigi scarso wrote:
> 2012/3/6 Pablo Rodríguez
> 
>     Luigi, I'm afraid it doesn't work as expected in the real file
> 
> I'm not surprised.... 

My fault, because I didn' realize that numbers only appeared on each
fifth line.

>     Lines are numbered there with [step=5]. So I get in headers only
>     actually numbered lines, although it header should contain the real line
>     numbers (even with the line number isn't shown on that line).
> 
>     How would it the the code in that case? (Sorry for asking this, but I'm
>     afraid I cannot code in lua [or in any other language].)
> 
> Do you have an example ?

Adapting from your code:

\startluacode
document.my_name_space = document.my_name_space or {}
document.my_name_space.pages = document.my_name_space.pages or {}
local f =  io.open(file.addsuffix(tex.jobname,"tuc") )
print('>>>>> ',f)
if f==nil then
 --[=[ do nothin ]=]
else
 f:close()
 local tuc = dofile(file.addsuffix(tex.jobname,"tuc"))
 local data =  tuc.structures.references.collected[""]
 local  w
 local pages = document.my_name_space.pages
 local realpage,ref
 for k, v in  pairs(data) do
   w=string.gmatch(k,'LIN:(\%d+):\%d+')
   ref = tonumber(w())
   realpage = tostring(v.references.realpage)
   pages[realpage]= pages[realpage] or {}
   table.insert(pages[realpage],ref)
 end
 for page,array in pairs(pages) do
   table.sort(array)
 end
end
\stopluacode

\definemarking[linenumber]
\define\LinenumberCommand
 {\normalexpanded{\setmarking[linenumber]{\linenumber}}\pagereference[LIN:\linenumber:\currentpage]}

\setuplinenumbering[command=\LinenumberCommand,step=5]

\startsetups linenumber
 \startluacode
 local l=0;
 if document.my_name_space == nil then return end;
 if document.my_name_space.pages == nil then return end;
 local pages = document.my_name_space.pages;
 for _,_ in  pairs(pages) do l=l+1 end;
 if l== 0 then return end;
 --[=[ OK, we have some data to print ]=]
 local array = pages[tostring(tex.count.realpageno)]
 l=0;
 if array ==nil then return end;
 for _,_ in  pairs(array) do l=l+1 end;
 if l>0 then context(array[1].." -- "..array[l]) end;
 \stopluacode
\stopsetups

\setupheadertexts[\texsetup{linenumber}]

\starttext

\dorecurse{6}{\input tufte\par}

\startlinenumbering
\dorecurse{20}{\input knuth\par}
\stoplinenumbering

\startlinenumbering
\dorecurse{20}{\input knuth\par}
\stoplinenumbering

\stoptext

On page 7 lines are numbered from lowest to highest values. A purist
might consider this wrong, but this is unlikely to happen on a real
book, since (I guess) line numbers on headers only make sense when they
two different series cannot be on the same page.

Many thanks for your help,


Pablo
-- 
http://www.ousia.tk
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