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%D \module
%D [ file=m-catchword,
%D version=2019.08.09,
%D title=\CONTEXT\ Extra Modules,
%D subtitle=Catchwords,
%D author=Hans Hagen,
%D date=\currentdate,
%D copyright={PRAGMA ADE \& \CONTEXT\ Development Team}]
%C
%C This module is part of the \CONTEXT\ macro||package and is
%C therefore copyrighted by \PRAGMA. See mreadme.pdf for
%C details.
\startluacode
-- If someone realy need it there probably is no need for speed, so we do
-- it quick and dirty.
local nodecodes = nodes.nodecodes
local kerncodes = nodes.kerncodes
local glyph_code = nodecodes.glyph
local disc_code = nodecodes.disc
local kern_code = nodecodes.kern
local hlist_code = nodecodes.hlist
local fontkern_code = kerncodes.fontkern
local function set_catchword(t)
local nextpage = tex.lists.contrib_head
if not nextpage then
return
end
local firstline = nil
for n in nodes.traverse_id(hlist_code,nextpage) do
firstline = n
break
end
if not firstline then
return
end
local list = firstline.list
if not list then
return
end
local first = nil
local last = nil
for n, id, subtype in nodes.traverse(list) do
if id == glyph_code or id == disc_code or (id == kern_code and subtype == fontkern_code) then
if not first then
first = n
end
last = n
elseif first then
break
end
end
if not first then
return
end
local page = tex.getbox(t.box)
local head = nodes.copy_list(first,last.next)
head = nodes.insert_before(head,head,nodes.pool.glue(1,1,1))
local line = nodes.hpack(head,page.width,"exactly")
if CONTEXTLMTXMODE > 0 then
line.yoffset = -t.voffset
line.xoffset = t.hoffset
else
line.shift = t.hoffset
line = nodes.insert_before(line,line,nodes.pool.kern(t.voffset-line.height))
line = nodes.vpack(line)
end
line.height = 0
line.depth = 0
node.insert_after(page.list,nodes.tail(page.list),line)
logs.report("catchword","appending %a on page %i",nodes.toutf(head),tex.getcount("realpageno"))
end
interfaces.implement {
name = "set_catchword",
actions = set_catchword,
arguments = {
{
{ "box", "integer" },
{ "hoffset", "dimension" },
{ "voffset", "dimension" },
},
},
}
\stopluacode
\unprotect
\installcorenamespace {catchword}
\installsimplecommandhandler \??catchword {catchword}
\setupcatchword
[\c!state=\v!stop,
\c!hoffset=\zeropoint,
\c!voffset=\lineheight]
\def\page_check_catchword_yes#1%
{\clf_set_catchword
box #1
hoffset \catchwordparameter\c!hoffset
voffset \catchwordparameter\c!voffset
\relax}
\let\page_check_catchword_nop\gobbleoneargument
\appendtoks
\doifelse{\catchwordparameter\c!state}\v!start
{\let\page_check_catchword\page_check_catchword_yes}%
{\let\page_check_catchword\page_check_catchword_nop}%
\to \everysetupcatchword
\appendtoks
\page_check_catchword\b_page_postprocessor
\to \t_page_postprocessors_page
\protect
\continueifinputfile{m-catchword.mkiv}
\setupcatchword
[state=start,
hoffset=.75em,
voffset=1cm]
\starttext
\dorecurse{100}{\input ward }
\stoptext
|
