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if not modules then modules = { } end modules ['scrn-hlp'] = {
version = 1.001,
comment = "companion to scrn-hlp.mkiv",
author = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
copyright = "PRAGMA ADE / ConTeXt Development Team",
license = "see context related readme files"
}
local format = string.format
local help = { }
interactions.help = help
local a_help = attributes.private("help")
local has_attribute = node.has_attribute
local copy_nodelist = node.copy_list
local hpack_nodelist = node.hpack
local register_list = nodes.pool.register
local nodecodes = nodes.nodecodes
local hlist_code = nodecodes.hlist
local vlist_code = nodecodes.vlist
local data, references = { }, { }
local helpscript = [[
function Hide_All_Help(prefix) {
var n = 0
while (true) {
n += 1 ;
v = this.getField(prefix + n) ;
if (v) {
v.hidden = true ;
this.dirty = false ;
} else {
return ;
}
}
}
]]
local template = "javascript(Hide_All_Help{help:}),action(show{help:%s})"
function help.register(number,name,box)
if helpscript then
interactions.javascripts.setpreamble("HelpTexts",helpscript)
helpscript = false
end
local b = copy_nodelist(tex.box[box])
register_list(b)
data[number] = b
if name and name ~= "" then
references[name] = number
structures.references.define("",name,format(template,number))
end
end
local function collect(head,used)
while head do
local id = head.id
if id == hlist_code then
local a = has_attribute(head,a_help)
if a then
if not used then
used = { a }
else
used[#used+1] = a
end
else
used = collect(head.list,used)
end
elseif id == vlist_code then
used = collect(head.list,used)
end
head = head.next
end
return used
end
function help.collect(box)
if next(data) then
return collect(tex.box[box].list)
end
end
commands.registerhelp = help.register
function commands.collecthelp(box)
local used = help.collect(box)
if used then
local done = { }
context.startoverlay()
for i=1,#used do
local d = data[used[i]]
if d and not done[d] then
local box = hpack_nodelist(copy_nodelist(d))
context(false,box)
done[d] = true
else
-- error
end
end
context.stopoverlay()
end
end
function help.reference(name)
return references[name] or tonumber(name) or 0
end
function commands.helpreference(name)
context(references[name] or tonumber(name) or 0)
end
function commands.helpaction(name)
context(template,references[name] or tonumber(name) or 0)
end
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