Module:Reply to

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This module is rated as ready for general use. It has reached a mature form and is thought to be bug-free and ready for use wherever appropriate. It is ready to mention on help pages and other Wikipedia resources as an option for new users to learn. To reduce server load and bad output, it should be improved by sandbox testing rather than repeated trial-and-error editing.

This module is subject to page protection. It is a highly visible module in use by a very large number of articles, or is substituted very frequently. Because vandalism or mistakes would affect many pages, and even trivial editing might cause substantial load on the servers, it is is protected from editing.

This module is used by {{Reply to}} to trigger a notification to one or several registered user(s) you are replying to in a discussion.

Usage from wikitext

This module cannot be used directly from wikitext. Please use the {{Reply to}} template instead.

Usage within templates

{{#invoke:Reply to|replyto|<noinclude>example=example name</noinclude>|max=maximum number of names}}

The |example= parameter sets the name that will show when the template page is viewed. This parameter should be surrounded by <noinclude></noinclude> so that it is not transcluded with the parent template, and the parent template will show an error message if no names are specified.
The |max= parameter sets the maximum number of names that the template will accept. If not specified, it defaults to 50 (which is the maximum number that Echo currently supports títí di August 2015^[update]). If this number of names is exceeded, the parent template will return an error message.

local p = {}

function p.replyto(frame)
	local origArgs = frame:getParent().args
	local args = {}
	local maxArg = 1
	local usernames = 0
	for k, v in pairs(origArgs) do
		if type(k) == 'number' then
			if mw.ustring.match(v,'%S') then
				if k > maxArg then maxArg = k end
				usernames = usernames + 1
				local title = mw.title.new(v)
				if not title then return '<strong class="error">Error in [[Template:Reply to]]: Input contains forbidden characters.</strong>' end
				args[k] = title.rootText
			end
		elseif v == '' and k:sub(0,5) == 'label' then
			args[k] = '&#x200B;'
		else
			args[k] = v
		end
	end

	if usernames > (tonumber(frame.args.max) or 50) then
		return string.format(
			'<strong class="error">Error in [[Template:Reply to]]: More than %s names specified.</strong>',
			tostring(frame.args.max or 50)
		)
	else
		if usernames < 1 then
			if frame.args.example then args[1] = frame.args.example else return '<strong class="error">Error in [[Template:Reply to]]: Username not given.</strong>' end
		end
		local isfirst = true
		local outStr = ''
		for i = 1, maxArg do
			if args[i] then
				if isfirst then
					outStr = string.format(
						'<span class="template-ping">%s[[User:%s|%s]]',
						args['prefix'] or '@',
						args[i],
						(args['label1'] or args['label']) or args[i]
					)
 					isfirst = false
				else
					if ( (usernames > 2) or ((usernames == 2) and (args['c'] == '')) ) then outStr = outStr..',' end
					if i == maxArg then outStr = outStr..' '..(args['c'] or 'and') end
					outStr = string.format(
						'%s [[User:%s|%s]]',
						outStr,
						args[i],
						args['label'..tostring(i)] or args[i]
					)
				end
			end
		end
		outStr = outStr..(args['p'] or ':')..'</span>'
		return outStr
	end
end

return p