Module:Main

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:

<syntaxhighlight lang="lua"> local mMain = require('Module:Main') </syntaxhighlight>

You can then use the _main function like this:

<syntaxhighlight lang="lua"> mMain._main(args, options) </syntaxhighlight>

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

<syntaxhighlight lang="lua"> mMain._main({'A'}) </syntaxhighlight>

Produces:

<div role="note" class="hatnote navigation-not-searchable">Main article: [[A]]</div>

Displays as:

Main article: A

Example 2

<syntaxhighlight lang="lua"> mMain._main({'Wikipedia:Categorization', 'Help:Category', 'Category:Wikipedia categories'}) </syntaxhighlight>

Produces:

<div role="note" class="hatnote navigation-not-searchable">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

<syntaxhighlight lang="lua"> mMain._main({'A|the letter "A"', 'B|the letter "B"', 'C|the letter "C"'}) </syntaxhighlight>

Produces:

<div role="note" class="hatnote navigation-not-searchable">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

<syntaxhighlight lang="lua"> mMain._main({'Wikipedia:Verifiability#Burden'}, {selfref = true}) </syntaxhighlight>

Produces:

<div role="note" class="hatnote navigation-not-searchable selfref">Main article: [[Wikipedia:Verifiability#Burden|Wikipedia:Verifiability § Burden]]</div>

Displays as:

Main article: Wikipedia:Verifiability § Burden

Example 5 (if used in the category namespace)

<syntaxhighlight lang="lua"> mMain._main({'A'}) </syntaxhighlight>

Produces:

<div role="note" class="hatnote navigation-not-searchable">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 mTableTools -- lazily initialise
local mArguments -- lazily initialise

local p = {}

function p.main(frame)
	mTableTools = require('Module:TableTools')
	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['l' .. tostring(k)]
			local page = {v, display}
			pages[k] = page
		end
	end
	pages = mTableTools.compressSparseArray(pages)
	local options = {
		selfref = args.selfref
	}
	return p._main(options, unpack(pages))
end

function p._main(options, ...)
	-- Get the list of pages. If no first page was specified we use the current
	-- page name.
	local pages = {...}
	local currentTitle = mw.title.getCurrentTitle()
	local firstPageTable = pages[1]
	local firstPage
	local emptyArgs = firstPageTable and '' or '[[Category:Hatnote templates using unusual parameters]]'
	if firstPageTable then
		firstPage = firstPageTable[1]
	else
		firstPage = currentTitle.text
		firstPageTable = {firstPage}
		pages[1] = firstPageTable
	end

	-- Find the pagetype.
	local firstPageNs = mHatnote.findNamespaceId(firstPage)
	local pagetype = firstPageNs == 0 and 'article' or 'page'
	pagetype = pagetype .. emptyArgs

	-- Make the formatted link text
	local links = mHatnote.formatPageTables(unpack(pages))
	links = mw.text.listToText(links)

	-- Build the text.
	local isPlural = #pages > 1
	local currentNs = currentTitle.namespace
	local isCategoryNamespace = currentNs - currentNs % 2 == 14
	local stringToFormat
	if isCategoryNamespace then
		if isPlural then
			stringToFormat = 'The main %ss for this'
				.. ' [[Wikipedia:Categorization|category]] are %s'
		else
			stringToFormat = 'The main %s for this'
				.. ' [[Wikipedia:Categorization|category]] is %s'
		end
	else
		if isPlural then
			stringToFormat = 'Main %ss: %s'
		else
			stringToFormat = 'Main %s: %s'
		end
	end
	local text = string.format(stringToFormat, pagetype, links)

	-- Process the options and pass the text to the _rellink function in
	-- [[Module:Hatnote]].
	options = options or {}
	local hnOptions = {
		extraclasses = 'relarticle mainarticle',
		selfref = options.selfref
	}
	return mHatnote._hatnote(text, hnOptions)
end

return p