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Hi Joel,
When I use the code given, it compiles and displays fine. But when I try replacing \everypar with \EveryPar, it halts during compiling
It looks like \EveryPar is a macro and not a token list.
These both work great, but do that for the whole document? Is there a way to restrict it to only apply the lines to some parts of the file, not every single paragraph?
Option 1: \newif\ifprintlines \EveryPar{% \ifprintlines% \vbox to 0pt{% \dorecurse{3}{% \rlap{% \hskip\dimexpr\hsize+1em% \vrule height 0.4pt width 3cm% \relax% }% }% }% \fi% } \parskip=\baselineskip \starttext \printlinestrue One line paragraph Two line paragraph \\ Two line paragraph Three line paragraph \\ Three line paragraph \\ Three line paragraph \printlinesfalse Four line paragraph \\ Four line paragraph \\ Four line paragraph \\ Four line paragraph \samplefile{bryson} \printlinestrue \samplefile{knuth} \stoptext Option 2: \startluacode -- Constants local RULE_OFFSET = tex.sp "1em" local RULE_THICKNESS = tex.sp "0.4pt" local RULE_LENGTH = tex.sp "3cm" local show_lines = true -- Callback function userdata.lines(head) if status.output_active or tex.nest.ptr > 1 or not show_lines then return head end local i = 0 for n in node.traverseid(node.id "hlist", head) do i = i + 1 if i > 3 then break end local offset = node.new "glue" offset.width = RULE_OFFSET node.slide(n.list).next = offset local rule = node.new "rule" rule.width = RULE_LENGTH rule.height = RULE_THICKNESS rule.depth = 0 offset.next = rule end return head end nodes.tasks.appendaction( "finalizers", "after", "userdata.lines" ) interfaces.implement { name = "showlines", public = true, arguments = { "boolean" }, actions = function(x) show_lines = x end, } \stopluacode \parskip=\baselineskip \starttext \showlines true One line paragraph Two line paragraph \\ Two line paragraph Three line paragraph \\ Three line paragraph \\ Three line paragraph \showlines false Four line paragraph \\ Four line paragraph \\ Four line paragraph \\ Four line paragraph \samplefile{bryson} \showlines true \samplefile{knuth} \stoptext These are both kind of hacky though. I'd recommend that you use Hans's solution instead: \starttext \def\StartHack {\margintext [location=right,style=] {\thinrules[n=3]}} \def\StopHack {\par \ifnum\prevgraf<3 \blank[\the\numexpr4-\prevgraf\relax*line] \fi} \StartHack \input tufte \StopHack \StartHack test test \StopHack \StartHack test test \StopHack \stoptext Thanks, -- Max