Module:Main

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This module produces a link to a main article or articles. It implements the {{main}} template. Normally, it produces a link like "Main article: A". If used in the category namespace, it produces a link like "The main article for this category is A". It is possible to specify multiple articles, and in this case plural wording is used automatically. If the first link is not an article, the module uses the wording "Main page" instead of "Main article".

Usage from wikitext

This module cannot be accessed directly from #invoke. Instead, it can only be used through the {{main}} template. Please see the template page for documentation.

Usage from other Lua modules

Load the module:

local mMain = require('Module:Main')

You can then use the _main function like this:

mMain._main(args, options)

The args parameter following options are a list of page link strings; if they use custom display values, each string should be preprocessed into a single piped string (e.g. page|display value). Category or file links are automatically escaped using the colon trick. If a link includes a section name, and no display value is set, links are automatically formatted as page § section, rather than the MediaWiki default of page#section.

The optional options table can be used to configure the function's output. At present, the only option available is "selfref", which is used when the output is a self-reference to Wikipedia. to set this option, use {selfref = true}. (See the {{selfref}} template for more details on self-references.)

Example 1

mMain._main({'A'})

Produces:

<div role="note" class="hatnote relarticle mainarticle">Main article: [[A]]</div>

Displays as:

Main article: A

Example 2

mMain._main({'Wikipedia:Categorization', 'Help:Category', 'Category:Wikipedia categories'})

Produces:

<div role="note" class="hatnote relarticle mainarticle">Main pages: [[Wikipedia:Categorization]], [[Help:Category]] and [[:Category:Wikipedia categories]]</div>

Displays as:

Main pages: Wikipedia:Categorization, Help:Category, and Category:Wikipedia categories

Example 3

mMain._main({'A|the letter "A"', 'B|the letter "B"', 'C|the letter "C"'})

Produces:

<div role="note" class="hatnote relarticle mainarticle">Main articles: [[A|the letter "A"]], [[B|the letter "B"]] and [[C|the letter "C"]]</div>

Displays as:

Main articles: the letter "A", the letter "B", and the letter "C"

Example 4

mMain._main({'Wikipedia:Verifiability#Burden'}, {selfref = true})

Produces:

<div role="note" class="hatnote relarticle mainarticle selfref">Main article: [[Wikipedia:Verifiability#Burden|Wikipedia:Verifiability § Burden]]</div>

Displays as:

Main page: Wikipedia:Verifiability § Burden

Example 5 (if used in the category namespace)

mMain._main({'A'})

Produces:

<div role="note" class="hatnote relarticle mainarticle">The main article for this [[Wikipedia:Categorization|category]] is [[A]]</div>

Displays as:

The main article for this category is A

Technical details

This module uses Module:Hatnote to format the hatnote text, Module:Hatnote list to process the list of links, and Module:Arguments to fetch the arguments from wikitext.

--[[
-- This module produces a link to a main article or articles. It implements the
-- template {{main}}.
-- 
-- If the module is used in category or category talk space, it produces "The
-- main article for this category is xxx". Otherwise, it produces
-- "Main article: xxx".
--]]

local mHatnote = require('Module:Hatnote')
local mHatlist = require('Module:Hatnote list')
local mArguments -- lazily initialise
local p = {}

function p.main(frame)
	mArguments = require('Module:Arguments')
	local args = mArguments.getArgs(frame, {parentOnly = true})
	local pages = {}
	for k, v in pairs(args) do
		if type(k) == 'number' then
			local display = args['label ' .. k] or args['l' .. k]
			local page = display and
				string.format('%s|%s', string.gsub(v, '|.*$', ''), display) or v
			pages[#pages + 1] = page
		end
	end
	if #pages == 0 and mw.title.getCurrentTitle().namespace == 0 then
		return mHatnote.makeWikitextError(
			'no page names specified',
			'Template:Main#Errors',
			args.category
		)
	end
	local options = {
		selfref = args.selfref
	}
	return p._main(pages, options)
end

function p._main(args, options)
	-- Get the list of pages. If no first page was specified we use the current
	-- page name.
	local currentTitle = mw.title.getCurrentTitle()
	if #args == 0 then args = {currentTitle.text} end
	local firstPage = string.gsub(args[1], '|.*$', '')
	-- Find the pagetype.
	local pageType = mHatnote.findNamespaceId(firstPage) == 0 and 'article' or 'page'
	-- Make the formatted link text
	list = mHatlist.andList(args, true)
	-- Build the text.
	local isPlural = #args > 1
	local mainForm
	local curNs = currentTitle.namespace
	if (curNs == 14) or (curNs == 15) then --category/talk namespaces
		mainForm = isPlural and
			'The main %ss for this [[Wikipedia:Categorization|category]] are %s'
			or
			'The main %s for this [[Wikipedia:Categorization|category]] is %s'
	else
		mainForm = isPlural and 'Main %ss: %s' or 'Main %s: %s'
	end
	local text = string.format(mainForm, pageType, list)
	-- Process the options and pass the text to the _rellink function in
	-- [[Module:Hatnote]].
	options = options or {}
	local hnOptions = {
		selfref = options.selfref
	}
	return mHatnote._hatnote(text, hnOptions)
end

return p