---- This module accepts a piece of text or the name of a page
 ---- It acts on angle-bracket tags in the text to simulate an extension of the html/wiki markup set
 ---- Vaguely per [[WP:Lua requests]], the <inc> tag is the first example, replaced with a number 
 ---- that increases each count.  You can set or reset the count and rate at any time by <inc i j>
 ---- where i=the number of that tag and j is the difference to succeeding tags.

local p={}

function p.markup(frame)
   local args=frame.args
   local parent=frame.getParent(frame) or {}
   pargs=parent.args or {}
   local text=args.text or pargs.text
   local page=args.page or pargs.page
   if (not text and not page) then
       if not args[1] then return "" end
       if mw.ustring.match(args[1],"<inc>") then text=args[1] else page=args[1] end
   end
   if not text then
       page=mw.ustring.match(page,"%s*(.*%S)%s*") or ""
       if page=="" then
           title=mw.title.getCurrentTitle()
           assert(title.getContent, "Bug: [[Module:TextMarkup]] failed to get content of the current page")
           page=title.fullText
       else title=mw.title.new(page)
           assert(title.getContent, "Error: [[Module:TextMarkup]] failed to get content of "..page)
       end -- one way or another, we have a working getContent method
       text=title.getContent(title)
   end -- (not text) -- now we have text
   local counter=0 -- set counter to zero before encountering an <inc> tag
   local increment=1 -- default increment
   local prowl=mw.ustring.gmatch(text,"<inc([^>]*)>") -- iterator function to get all the tags
   local output=text -- copy to do substitutions on
   repeat
       local inccontent=prowl()
       if not inccontent then break end -- loop exit
       local n1,n2 = mw.ustring.match(text,"%D-(%d+)%D-(%d+)")
       if n2 then increment=tonumber(n2) end
       counter=counter+increment
       if n1 then counter=tonumber(n1) end
       output=mw.ustring.gsub(output,"<inc([^>]*)>",tostring(counter),1) -- change one instance according to the one instance found
   until false
   return output
end

return p