Re: [NTG-context] orphans and widows in poems

17 Jun 2013


      On 6/17/2013 11:05 PM, Wolfgang Schuster wrote:
...
Am 17.06.2013 um 19:18 schrieb Pablo Rodríguez :
...
On 16/06/13 21:03, Wolfgang Schuster wrote:
...
Am 16.06.2013 um 09:46 schrieb Pablo Rodríguez :
...
[...]
Is there no way to avoid orphans and widows in the lines
environment?
1. Don’t use * in your setups names because names starting with an
asterisk are system modes.
2. To load the defaults settings you have to use \setups[*reset]
which needs the asterisks because it’s a system mode.
3.The settings doesn’t help because in the lines environment each
line is a separate paragraph which makes \widowpenalty useless here.
Thanks for your reply, Wolfgang.
So, according to 3, there is no way to prevent widow or orphan lines in
a line environment, isn't it?
Not with the current implementation of the environment because it doesn’t
know how many lines are there. With a Lua based solution it would be simple
to add a mechanism to prevent a page break at a certain region because
the needed information are available.
yes, some of that is on the agenda (not to hard but as usual it take a 
bit of thinking / experimenting to get an interface)

basically it's a variant of \setpenalties (the plural \widowpenalties etc)
...
\startluacode
userdata              = userdata              or { }
userdata.linescontent = userdata.linescontent or { }
local linescontent = userdata.linescontent
function linescontent.process()
  local lines = string.splitlines(buffers.getcontent("linescontent"))
  context.begingroup()
  for i=1,#lines do
      local l = lines[i]
      context("%s",l)
      context.par()
  end
  context.endgroup()
end
\stopluacode
\def\startlinescontent
   {\grabbufferdata[linescontent][startlinescontent][stoplinescontent]}
\def\stoplinescontent
   {\ctxlua{userdata.linescontent.process()}}
\starttext
\startlinescontent
One
Two
Three
Four
Five
Six
\stoplinescontent
\stoptext
Wolfgang
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