Module:Template link general

Module documentation
Uses Lua:
This module is rated as beta, and is ready for widespread use. It is still new and should be used with some caution to ensure the results are as expected.
Implements {{tlg}}.
Usage

{{#invoke:Template link general|main}}
-- This implements [[Template:Tlg]]
local getArgs = require('Module:Arguments').getArgs
local yesno = require('Module:Yesno')

local cfg = mw.loadData('Module:Template link general/config')

local p = {}

-- Is a string non-empty?
local function _ne(s) 
	return s ~= nil and s ~= ""
end

local nw = mw.text.nowiki

local function addTemplate(s)
	local i, _ = s:find(':', 1, true)
	if i == nil then
		return 'Template:' .. s
	end
	local ns = s:sub(1, i - 1)
	if ns == '' or mw.site.namespaces[ns] then
		return s
	else
		return 'Template:' .. s
	end
end

local function trimTemplate(s)
	local needle = 'template:'
	if s:sub(1, needle:len()):lower() == needle then
		return s:sub(needle:len() + 1)	
	else
		return s
	end
end

local function linkTitle(args)
	if yesno(args.nolink) then
		return args[1]
	end

	local titleObj
	local titlePart = '[['
	if args[1] then
		-- This handles :Page and other NS
		titleObj = mw.title.new(args[1], 'Template')
	else
		titleObj = mw.title.getCurrentTitle()
	end

	titlePart = titlePart .. (titleObj ~= nil and titleObj.fullText or
				addTemplate(args[1]))

	local textPart = args.alttext
	if not _ne(textPart) then
		if titleObj ~= nil then
			textPart = titleObj:inNamespace("Template") and args[1] or titleObj.fullText
		else
			-- redlink
			textPart = args[1]
		end
	end

	if yesno(args.brace) then
		textPart = nw('{{') .. textPart .. nw('}}')
	elseif yesno(args.braceinside) then
		textPart = nw('{') .. textPart .. nw('}')
	end

	titlePart = titlePart .. '|' .. textPart .. ']]'
	if yesno(args.braceinside) then
		titlePart = nw('{') .. titlePart .. nw('}')
	end
	return titlePart
end

function p.main(frame)
	local args = getArgs(frame, {
		trim = true,
		removeBlanks = false,
		wrappers = {
			'Template:Tlg',
		},
	})
	return p._main(args)
end

function p._main(args)
	-- TemplateStyles
	local templateStyles = {
		mono   = false,
		nowrap = false,
	}

	local bold = yesno(args.bold) or yesno(args.boldlink) or yesno(args.boldname)
	local italic = yesno(args.italic) or yesno(args.italics)
	local dontBrace = yesno(args.brace) or yesno(args.braceinside)
	local code = yesno(args.code) or yesno(args.tt)
	local classes = {}

	-- Build the link part
	local titlePart = linkTitle(args)
	if bold then titlePart = "'''" .. titlePart .. "'''" end

	if yesno(args.subst) then
		local substLink = cfg['subst-link']
		if _ne(substLink) and yesno(args['link subst']) then
			titlePart = '[[' .. substLink .. '|subst]]:' .. titlePart
		else
			titlePart = 'subst:' .. titlePart
		end
	end

	if yesno(args.nowrapname) then
		templateStyles.nowrap = true
		titlePart = '<span class="nowrap">' .. titlePart .. '</span>'
	end

	-- Build the arguments
	local textPart = ""
	local textPartBuffer = ""
	local i = 2
	while args[i] do
		local val = args[i]
		textPartBuffer = textPartBuffer .. '&#124;'
		if val ~= "" then
			if yesno(args.nowiki) then
				-- Unstrip nowiki tags first because calling nw on something that already contains nowiki tags will
				-- mangle the nowiki strip marker and result in literal UNIQ...QINU showing up
				val = nw(mw.text.unstripNoWiki(val))
			end
			if italic then val = '<span style="font-style:italic;">' .. val .. '</span>' end
			textPart = textPart .. textPartBuffer .. val
			textPartBuffer = ""
		end
		i = i+1
	end

	local tagName = nil
	local css = nil

	-- final wrap
	local ret = titlePart .. textPart
	if not dontBrace then ret = nw('{{') .. ret .. nw('}}') end
	if yesno(args.a) then ret = nw('*') .. '&nbsp;' .. ret end
	if yesno(args.kbd) then
		tagName = 'kbd'
	end

	if yesno(args.mono) then
		templateStyles.mono = true
		table.insert(classes, 'monospaced')
	end

	local plaincode = yesno(args.plaincode) and not code
	if code or plaincode then
		if tagName then
			-- kbd == true && code == true
			ret = ('<%s>%s</%s>'):format(tagName, ret, tagName)
		end
		tagName = 'code'
		if plaincode then
			css = {
				background = 'transparent',
				border     = 'none',
			}
		end
	end

	if yesno(args.nowrap) then
		templateStyles.nowrap = true
		table.insert(classes, 'nowrap')
	end

	if tagName or #classes > 0 or css then
		local span = mw.html.create(tagName or 'span')
			:addClass(table.concat(classes, ' '))
			:wikitext(ret)

		if css then
			span:css(css)
		end
		ret = tostring(span:allDone())
	end

	local ts = {}
	if templateStyles.mono then
		table.insert(ts, mw.getCurrentFrame():extensionTag{
			name = 'templatestyles',
			args = { src = 'Template:Mono/styles.css' }
		})
	end

	if templateStyles.nowrap then
		table.insert(ts, mw.getCurrentFrame():extensionTag{
			name = 'templatestyles',
			args = { src = 'Template:Nowrap/styles.css' }
		})
	end

	if yesno(args.debug) then
		ret = ret .. '\n<pre>' .. mw.text.encode(mw.dumpObject(args)) .. '</pre>'
	end

	return table.concat(ts) .. ret
end

return p