2012/3/4 Pablo Rodríguez <oi...@web.de>
> On 03/04/2012 12:04 PM, Wolfgang Schuster wrote:
> > Am 04.03.2012 um 11:20 schrieb Pablo Rodríguez:
> >>
> >> I wanted to be able to have in the headers the first and last line
> >> number from page. This feature is extremely useful when typesetting some
> >> kinds of poetry.
> >> [...]
> >> Is that possible to achieve with ConTeXt?
> >
> > Yes but it’s not usable because the numbers are always shown on the next
> page.
>
> Many thanks for your reply, Wolfgang.
>
> If you allow me one more question: is showing the numbers on the same
> page they refer to beyond the limits of TeX/LuaTeX?
>
Absolutely no. As Hans said, a quick/dirty trick is possible: just mark the
object
with \pagereference[<unique id>]. The data is stored into the *tuc file,
which can be read
from the second pass.
Then always run with
$>context --purgeall ; context <yourfile>.mkiv
Of course, "it's possible " doesn't mean "it's the right context way".
\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]
\startsetups linenumber
% \doiftext {
% \getmarking[linenumber]
% }
% {
% \getmarking[linenumber][first] –
\getmarking[linenumber][last]
% }
\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(" nr. "..array[1].." --- "..array[l]) end;
\stopluacode
\stopsetups
\setupheadertexts[\texsetup{linenumber}]
\starttext
\dorecurse{6}{\input tufte\par}
\startlinenumbering
\dorecurse{20}{\input knuth\par}
\stoplinenumbering
\resetmarking[linenumber]
\dorecurse{6}{\input tufte\par}
\stoptext
--
luigi
___________________________________________________________________________________
If your question is of interest to others as well, please add an entry to the
Wiki!
maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
webpage : http://www.pragma-ade.nl / http://tex.aanhet.net
archive : http://foundry.supelec.fr/projects/contextrev/
wiki : http://contextgarden.net
___________________________________________________________________________________
