How to preserve parskip in vsplit?











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If I box something with non-zero parskip and split it using vsplit, the resulting split box will have the exact requested height. This is ususally more than I want, so I unvbox the split box and re-vbox it immediately to remove superfluous whitespace on the bottom. This approach usually works, unless you have non-zero parskip and your split point is in between paragraphs. Consider the MWE:



parskip=7pt



setbox0=vbox{input knuthpar}



splittopskip=0pt

setbox1=vsplit 0 to 2baselineskip

setbox1=vbox{unvbox1}

ifdimdp1<dpstrutbox

  dp1=dpstrutbox

fi



box1

box0



bye


As you can see in the output, the parskip is missing between the first two paragraphs, because that is where the split was taken.



enter image description here



Is there a way to detect whether the last item of the split box would be parskip? LuaTeX solutions are also welcome.






luatex plain-tex







share|improve this question


























    up vote
    0
    down vote

    favorite












    If I box something with non-zero parskip and split it using vsplit, the resulting split box will have the exact requested height. This is ususally more than I want, so I unvbox the split box and re-vbox it immediately to remove superfluous whitespace on the bottom. This approach usually works, unless you have non-zero parskip and your split point is in between paragraphs. Consider the MWE:



    parskip=7pt
    

    
setbox0=vbox{input knuthpar}
    

    
splittopskip=0pt
    
setbox1=vsplit 0 to 2baselineskip
    
setbox1=vbox{unvbox1}
    
ifdimdp1<dpstrutbox
    
  dp1=dpstrutbox
    
fi
    

    
box1
    
box0
    

    
bye


    As you can see in the output, the parskip is missing between the first two paragraphs, because that is where the split was taken.



    enter image description here



    Is there a way to detect whether the last item of the split box would be parskip? LuaTeX solutions are also welcome.






    luatex plain-tex







    share|improve this question
























      up vote
      0
      down vote

      favorite









      up vote
      0
      down vote

      favorite











      If I box something with non-zero parskip and split it using vsplit, the resulting split box will have the exact requested height. This is ususally more than I want, so I unvbox the split box and re-vbox it immediately to remove superfluous whitespace on the bottom. This approach usually works, unless you have non-zero parskip and your split point is in between paragraphs. Consider the MWE:



      parskip=7pt
      

      
setbox0=vbox{input knuthpar}
      

      
splittopskip=0pt
      
setbox1=vsplit 0 to 2baselineskip
      
setbox1=vbox{unvbox1}
      
ifdimdp1<dpstrutbox
      
  dp1=dpstrutbox
      
fi
      

      
box1
      
box0
      

      
bye


      As you can see in the output, the parskip is missing between the first two paragraphs, because that is where the split was taken.



      enter image description here



      Is there a way to detect whether the last item of the split box would be parskip? LuaTeX solutions are also welcome.






      luatex plain-tex







      share|improve this question













      If I box something with non-zero parskip and split it using vsplit, the resulting split box will have the exact requested height. This is ususally more than I want, so I unvbox the split box and re-vbox it immediately to remove superfluous whitespace on the bottom. This approach usually works, unless you have non-zero parskip and your split point is in between paragraphs. Consider the MWE:



      parskip=7pt
      

      
setbox0=vbox{input knuthpar}
      

      
splittopskip=0pt
      
setbox1=vsplit 0 to 2baselineskip
      
setbox1=vbox{unvbox1}
      
ifdimdp1<dpstrutbox
      
  dp1=dpstrutbox
      
fi
      

      
box1
      
box0
      

      
bye


      As you can see in the output, the parskip is missing between the first two paragraphs, because that is where the split was taken.



      enter image description here



      Is there a way to detect whether the last item of the split box would be parskip? LuaTeX solutions are also welcome.






      luatex plain-tex




      luatex plain-tex






      share|improve this question













      share|improve this question











      share|improve this question




      share|improve this question










      asked 12 mins ago









      Henri Menke

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