Modul:Clickable button 2

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    -- This module implements {{clickable button 2}}.
    
    local yesno = require('Module:Yesno')
    
    local p = {}
    
    function p.main(frame)
    	local args = require('Module:Arguments').getArgs(frame, {
    		wrappers = 'Template:Clickable button 2'
    	})
    	return p.luaMain(args)
    end
    
    function p.luaMain(args)
    	if not args[1] and not args.url then
    		return ''
    	end
    	local data = p.makeLinkData(args)
    	local link = p.renderLink(data)
    	local trackingCategories = p.renderTrackingCategories(args)
    	return link .. trackingCategories
    end
    
    function p.makeLinkData(args)
    	local data = {}
    
    	-- Get the link and display values, and find whether we are outputting a
    	-- wikilink or a URL.
    	if args.url then
    		data.isUrl = true
    		data.link = args.url
    		if args[1] then
    			data.display = args[1]
    		else
    			data.display = args.url
    		end
    	else
    		data.isUrl = false
    		data.link = args[1]
    		if args[2] then
    			data.display = args[2]
    		else
    			data.display = args[1]
    		end
    	end
    
    	-- Classes
    	local class = args.class and args.class:lower()
    	data.classes = {}
    	if class == 'ui-button-green'
    		or class == 'ui-button-blue'
    		or class == 'ui-button-red'
    	then
    		table.insert(
    			data.classes,
    			'submit ui-button ui-widget ui-state-default ui-corner-all'
    				.. ' ui-button-text-only ui-button-text'
    		)
    	else
    		table.insert(data.classes, 'mw-ui-button')
    	end
    	if class then
    		table.insert(data.classes, class)
    	end
    
    	-- Styles
    	do
    		--[[
    		-- Check whether we are on the same page as we have specified in
    		-- args[1], but not if we are using a URL link, as then args[1] is only
    		-- a display value. If we are currently on the page specified in
    		-- args[1] make the button colour darker so that it stands out from
    		-- other buttons on the page.
    		--]]
    		local success, linkTitle, currentTitle
    		if not data.isUrl then
    			currentTitle = mw.title.getCurrentTitle()
    			success, linkTitle = pcall(mw.title.new, args[1])
    		end
    		if success
    			and linkTitle
    			and mw.title.equals(currentTitle, linkTitle)
    		then
    			if class == 'ui-button-blue'
    				or class == 'mw-ui-progressive'
    				or class == 'mw-ui-constructive'
    			then
    				data.backgroundColor = '#2962CB'
    			elseif class == 'ui-button-green' then
    				data.backgroundColor = '#008B6D'
    			elseif class == 'ui-button-red' or class == 'mw-ui-destructive' then
    				data.backgroundColor = '#A6170F'
    			else
    				data.backgroundColor = '#CCC'
    				data.color = '#666'
    			end
    		end
    		-- Add user-specified styles.
    		data.style = args.style
    	end
    
    	return data
    end
    
    function p.renderLink(data)
    	-- Render the display span tag.
    	local display
    	do
    		local displaySpan = mw.html.create('span')
    		for i, class in ipairs(data.classes or {}) do
    			displaySpan:addClass(class)
    		end
    		displaySpan
    			:attr('role', 'button')
    			:attr('aria-disabled', 'false')
    			:css{
    				['background-color'] = data.backgroundColor,
    				color = data.color
    			}
    		if data.style then
    			displaySpan:cssText(data.style)
    		end
    		displaySpan:wikitext(data.display)
    		display = tostring(displaySpan)
    	end
    
    	-- Render the link
    	local link 
    	if data.isUrl then
    		link = string.format('[%s %s]', data.link, display)
    	else
    		link = string.format('[[%s|%s]]', data.link, display)
    	end
    
    	return string.format('<span class="plainlinks">%s</span>', link)
    end
    
    function p.renderTrackingCategories(args)
    	if yesno(args.category) == false then
    		return ''
    	end
    	local class = args.class and args.class:lower()
    	if class == 'ui-button-green'
    		or class == 'ui-button-blue'
    		or class == 'ui-button-red'
    	then
    		return '[[Category:Pages using old style ui-button-color]]'
    	else
    		return ''
    	end
    end
    
    return p