Module:Lighthouse tracking

local p = {}

function p.tracking(frame)

local res = ''

local isNRHP = false

local hasNRHPbox = false

local heritage = frame.args.heritage or ''

if heritage == '' then

elseif (heritage:match('National Register of Historic Places') or

heritage:match('NRHP') ) then

res = res .. 'Category:Pages using infobox lighthouse with NRHP heritage'

isNRHP = true

end

for k, v in pairs( frame:getParent().args ) do

if k and k == 'module' then

if v and v:match('

if v:match('National Register of Historic Places') or v:match('NRHP')

or v:match('U.S. Historic district')

or v:match('U.S. National Register of Historic Places') then

hasNRHPbox = true

end

end

end

end

if hasNRHPbox == false and isNRHP == true then

res = res .. '‽'

end

if hasNRHPbox == true and isNRHP == false then

res = res .. '¶'

end

return res

end

return p