Module:Description

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Description is a module implementing functionality of {{Description}}
template, which is used by {{en}}, {{de}} and other language templates.

Authors and maintainers:
* User:Jarekt  
]]

local core = require('Module:Core')
local p = {}

------------------------------------------------------------------------------
--[[
display a language followed by a message. Like "English: Hello" with extensive HTML marking
Code equivalent to https://commons.wikimedia.org/wiki/Template:Description 
Inputs:
  1) text_lang - language code for the above text, also used as a name of the CSS formating class
  2) text - description text to display
  3) args -  additional optional arguments. Numbers in perenthesis are parameter numbers in the original template.
	   * hover    - (3) hover aka mouseover aka tooltip text
	   * lang_tag - (4) standard code for lang tag in HTML (optional, default is same as text_lang)
	   * ext      - (5) extension text shown after the language name before colon (optional, default is empty)
       * inline - Optional, default is false. When set to true, forces the template to be displayed 
            inline, so that it does not break the current paragraph (that makes possible to put several 
	        descriptions side by side on a single line)	   
]]
function p.langWrapper(text_lang, text, args) 
	local dir, space, colon, lang_name, hover
	local inline    = core.yesno(args.inline, false) and 'inline' or nil 
	if 	mw.language.isKnownLanguageTag(text_lang) then -- supported language
		local langObj = mw.language.new( text_lang )
		dir       = langObj:getDir()          -- text direction
		space     = mw.message.new( "Word-separator" ):inLanguage(text_lang):plain() 
		colon     = mw.message.new( "Colon" ):inLanguage(text_lang):plain() 
		hover     = mw.language.fetchLanguageName( text_lang, args.user_lang or 'en')
		lang_name = mw.language.fetchLanguageName( text_lang, text_lang)
		lang_name = langObj:ucfirst(lang_name)
	else -- unsuported language
		dir   = 'ltr'
		space = ' '
		colon = ':'
		hover = args.hover
		lang_name = text_lang or 'Unknown'
	end
	lang_name = args.lang_name or lang_name-- user provided args.lang_name takes presedent
	lang_name = '<b>' .. lang_name .. (args.ext or '') .. colon .. '</b>'
	
	-- create HTML
	local ltag = mw.html.create('span')  -- bold language name string
		:addClass('language')  -- class: "language" 
		:addClass(text_lang)   -- class:  "en", "de" etc.	
		:attr('title', hover)  -- add hover aka mouseover aka tooltip text
		:wikitext(lang_name)
	local dtag = mw.html.create('div')
		:addClass('description')      -- div.description is tracked by mw:Extension:CommonsMetadata
		:addClass('mw-content-'..dir) -- mw-content-rtl and mw-content-ltr are defined in mediawiki-code (https://gerrit.wikimedia.org/r/c/mediawiki/core/+/208332)
		:addClass(text_lang)          -- not sure where "en", "de" etc. are defined
		:attr('dir', dir)
		:attr('lang', text_lang)
		:css('display', inline) 
		:wikitext(tostring(ltag) .. space .. text)
	return tostring(dtag)
end


function p.description(frame) 
	local args = core.getArgs(frame)
	local desc
	args.user_lang = args.user_lang or args.lang
	args.inline    = (args.inline ~= nil) -- convert to boolean
	if args.text == nil then -- if no string than add error message and a category
		-- <span class="plainlinks">[{{fullurl:Category:Language templates with no text displayed}} <span class="error">{{Description/i18n}}</span>]</span>
		local cat = 'Category:Language templates with no text displayed'
		local msg  = core.formatMessage('I18n/DescriptionError.tab', 'missing text', lang)
		msg = mw.html.create('span'):addClass("error"):wikitext(msg)
		msg = '[' .. frame:callParserFunction{ name = 'fullurl', args={cat} }  .. tostring(msg) .. ']'
		msg = mw.html.create('span'):addClass("plainlinks"):wikitext(msg)
		desc = p.langWrapper(args.text_lang, tostring(msg), args)
		local namespace = mw.title.getCurrentTitle().namespace
		local LUT = {[0]=1, [6]=1, [10]=1, [14]=1, [100]=1, [106]=1}
		if LUT[namespace]==1 then
			desc = desc .. '[[' .. cat .. ']]'
		end
	else
		desc = p.langWrapper(args.text_lang, args.text, args)
	end
	return desc
end

return p

--[[
Oddballs:
   
]]