Module:Navbar
local p = {}
 local cfg = mw.loadData('Module:Navbar/configuration')
 
 local function get_title_arg(is_collapsible, template)
 	local title_arg = 1
 	if is_collapsible then title_arg = 2 end
 	if template then title_arg = 'template' end
 	return title_arg
 end
 
 local function choose_links(template, args)
 	-- The show table indicates the default displayed items.
 	-- view, talk, edit, hist, move, watch
 	-- TODO: Move to configuration.
 	local show = {true, true, true, false, false, false}
 	if template then
 		show[2] = false
 		show[3] = false
 		local index = {t = 2, d = 2, e = 3, h = 4, m = 5, w = 6,
 			talk = 2, edit = 3, hist = 4, move = 5, watch = 6}
 		-- TODO: Consider removing TableTools dependency.
 		for _, v in ipairs(require ('Module:TableTools').compressSparseArray(args)) do
 			local num = index[v]
 			if num then show[num] = true end
 		end
 	end
 
 	local remove_edit_link = args.noedit
 	if remove_edit_link then show[3] = false end
 	
 	return show
 	
 end
 
 local function add_link(link_description, ul, is_mini, font_style)
 	local l
 	if link_description.url then
 		l = {'[', '', ']'}
 	else
 		l = {'[[', '|', ']]'}
 	end
 	ul:tag('li')
 		:addClass('nv-' .. link_description.full)
 		:wikitext(l[1] .. link_description.link .. l[2])
 		:tag(is_mini and 'abbr' or 'span')
 			:attr('title', link_description.html_title)
 			:cssText(font_style)
 			:wikitext(is_mini and link_description.mini or link_description.full)
 			:done()
 		:wikitext(l[3])
 		:done()
 end
 
 local function make_list(title_text, has_brackets, displayed_links, is_mini, font_style)
 	
 	local title = mw.title.new(mw.text.trim(title_text), cfg.title_namespace)
 	if not title then
 		error(cfg.invalid_title .. title_text)
 	end
 	local talkpage = title.talkPageTitle and title.talkPageTitle.fullText or ''
 	
 	-- TODO: Get link_descriptions and show into the configuration module.
 	-- link_descriptions should be easier...
 	local link_descriptions = {
 		{ ['mini'] = 'பா', ['full'] = 'பார்', ['html_title'] = 'இவ்வார்ப்புருவைப் பார்க்க',
 			['link'] = title.fullText, ['url'] = false },
 		{ ['mini'] = 'உ', ['full'] = 'உரை', ['html_title'] = 'இவ்வார்ப்புரு குறித்து உரையாடுக',
 			['link'] = talkpage, ['url'] = false },
 		{ ['mini'] = 'தொ', ['full'] = 'தொகு', ['html_title'] = 'இவ்வார்ப்புருவைத் தொகுக்க',
 			['link'] = title:fullUrl('action=edit'), ['url'] = true },
 		{ ['mini'] = 'வ', ['full'] = 'வரலாறு', ['html_title'] = 'இவ்வார்ப்புருவின் வரலாறு',
 			['link'] = title:fullUrl('action=history'), ['url'] = true },
 		{ ['mini'] = 'm', ['full'] = 'move', ['html_title'] = 'Move this template',
 			['link'] = mw.title.new('Special:Movepage'):fullUrl('target='..title.fullText), ['url'] = true },
 		{ ['mini'] = 'w', ['full'] = 'watch', ['html_title'] = 'Watch this template', 
 			['link'] = title:fullUrl('action=watch'), ['url'] = true }
 	}
 
 	local ul = mw.html.create('ul')
 	if has_brackets then
 		ul:addClass(cfg.classes.brackets)
 			:cssText(font_style)
 	end
 	
 	for i, _ in ipairs(displayed_links) do
 		if displayed_links[i] then add_link(link_descriptions[i], ul, is_mini, font_style) end
 	end
 	return ul:done()
 	
 end
 
 function p._navbar(args)
 	
 	-- TODO: We probably don't need both fontstyle and fontcolor...
 	local font_style = args.fontstyle
 	local font_color = args.fontcolor
 	local is_collapsible = args.collapsible
 	local is_mini = args.mini
 	local is_plain = args.plain
 	
 	local collapsible_class = nil
 	if is_collapsible then
 		collapsible_class = cfg.classes.collapsible
 		if not is_plain then is_mini = 1 end
 		if font_color then
 			font_style = (font_style or '') .. '; color: ' .. font_color .. ';'
 		end
 	end
 	
 	local navbar_style = args.style
 	local div = mw.html.create():tag('div')
 	div
 		:addClass(cfg.classes.navbar)
 		:addClass(cfg.classes.plainlinks)
 		:addClass(cfg.classes.horizontal_list)
 		:addClass(collapsible_class) -- we made the determination earlier
 		:cssText(navbar_style)
 
 	if is_mini then div:addClass(cfg.classes.mini) end
 
 	local box_text = (args.text or cfg.box_text) .. ' '
 	 -- the concatenated space guarantees the box text is separated
 	if not (is_mini or is_plain) then
 		div
 			:tag('span')
 				:addClass(cfg.classes.box_text)
 				:cssText(font_style)
 				:wikitext(box_text)
 	end
 	
 	local template = args.template
 	local displayed_links = choose_links(template, args)
 	local has_brackets = args.brackets
 	local title_arg = get_title_arg(is_collapsible, template)
 	local title_text = args[title_arg] or (':' .. mw.getCurrentFrame():getParent():getTitle())
 	local list = make_list(title_text, has_brackets, displayed_links, is_mini, font_style)
 	div:node(list)
 
 	if is_collapsible then
 		local title_text_class
 		if is_mini then
 			title_text_class = cfg.classes.collapsible_title_mini
 		else
 			title_text_class = cfg.classes.collapsible_title_full
 		end
 		div:done()
 			:tag('div')
 			:addClass(title_text_class)
 			:cssText(font_style)
 			:wikitext(args[1])
 	end
 	
 	local frame = mw.getCurrentFrame()
 	-- hlist -&gt; navbar is best-effort to preserve old Common.css ordering.
 	return frame:extensionTag{
 		name = 'templatestyles', args = { src = cfg.hlist_templatestyles }
 	} .. frame:extensionTag{
 		name = 'templatestyles', args = { src = cfg.templatestyles }
 	} .. tostring(div:done())
 end
 
 function p.navbar(frame)
 	return p._navbar(require('Module:Arguments').getArgs(frame))
 end