Module:Hatnote

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This is a meta-module that provides various functions for making hatnotes. It implements the {{hatnote}} template, for use in hatnotes at the top of pages. It also contains a number of helper functions for use in other Lua hatnote modules.

Use from wikitext

The functions in this module cannot be used directly from #invoke, and must be used through templates instead. Please see Template:Hatnote and Template:Format link for documentation.

Use from other Lua modules

To load this module from another Lua module, use the following code.

local mHatnote = require('Module:Hatnote')

You can then use the functions as documented below.

Hatnote

mHatnote._hatnote(s, options)

Formats the string s as a hatnote. This encloses s in the tags <div class="hatnote">...</div>. Options are provided in the options table. Options include:

• options.extraclasses - a string of extra classes to provide
• options.selfref - if this is not nil or false, adds the class "selfref", used to denote self-references to Wikipedia (see Template:Selfref))

The CSS of the hatnote class is defined in Module:Hatnote/styles.css.

Example 1

mHatnote._hatnote('This is a hatnote.')

Produces: <div class="hatnote">This is a hatnote.</div>

Displays as:

This is a hatnote.

Example 2

mHatnote._hatnote('This is a hatnote.', {extraclasses = 'boilerplate seealso', selfref = true})

Produces: <div class="hatnote boilerplate seealso selfref">This is a hatnote.</div>

Displayed as:

This is a hatnote.

Find namespace id

mHatnote.findNamespaceId(link, removeColon)

Finds the namespace id of the string link, which should be a valid page name, with or without the section name. This function will not work if the page name is enclosed with square brackets. When trying to parse the namespace name, colons are removed from the start of the link by default. This is helpful if users have specified colons when they are not strictly necessary. If you do not need to check for initial colons, set removeColon to false.

Examples

mHatnote.findNamespaceId('Lion') → 0

mHatnote.findNamespaceId('Category:Lions') → 14

mHatnote.findNamespaceId(':Category:Lions') → 14

mHatnote.findNamespaceId(':Category:Lions', false) → 0 (the namespace is detected as ":Category", rather than "Category")

Make wikitext error

mHatnote.makeWikitextError(msg, helpLink, addTrackingCategory)

Formats the string msg as a red wikitext error message, with optional link to a help page helpLink. Normally this function also adds Category:Hatnote templates with errors (0). To suppress categorization, pass false as third parameter of the function (addTrackingCategory).

Examples:

mHatnote.makeWikitextError('an error has occurred') →

mHatnote.makeWikitextError('an error has occurred', 'Template:Example#Errors') →

Examples

For an example of how this module is used in other Lua modules, see Module:Labelled list hatnote

The above documentation is transcluded from Module:Hatnote/doc. (edit | history)
Editors can experiment in this module's sandbox (edit | diff) and testcases (edit | run) pages.
Subpages of this module.

--------------------------------------------------------------------------------
--                              Module:Hatnote                                --
--                                                                            --
-- This module produces hatnote links and links to related articles. It       --
-- implements the {{rellink}} and {{hatnote}} meta-templates, and a few of    --
-- the more popular templates they depend on, including {{main}},             --
-- {{see also}}, {{further}} and {{details}}.                                 --
--------------------------------------------------------------------------------

local mTableTools = require('Module:TableTools')
local mArguments = require('Module:Arguments')

--------------------------------------------------------------------------------
-- Argument processing
--------------------------------------------------------------------------------

--[[
-- The p table is for functions to be returned from #invoke, and for functions
-- to be used from other Lua modules. The f table is for functions acting as a
-- bridge between #invoke functions and Lua module functions. #invoke functions
-- are connected to f table functions through the makeInvokeFunction function.
-- Functions for use from other Lua modules have names beginning with an
-- underscore. 
--]]
local p, f = {}, {}

local function makeInvokeFunction(func)
	return function(frame)
		local args = mArguments.getArgs(frame, {parentOnly = true})
		return func(args)
	end
end

--------------------------------------------------------------------------------
-- Helper functions
--------------------------------------------------------------------------------

local function formatLink(link, display)
	-- Makes a wikilink from the given link and display values. Links are
	-- escaped with colons if necessary, and links to sections are detected
	-- and displayed with " § " as a separator rather than the standard
	-- MediaWiki "#".

	-- Find whether we need to use the colon trick or not. We need to use the
	-- colon trick for categories and files, as otherwise category links
	-- categorise the page and file links display the file.
	local namespace = link:match('^(.-):')
	local colon
	if namespace and mw.site.namespaces[namespace] then
		-- The start of the link is a valid namespace name; check whether it is
		-- a category or a file.
		local nsid = mw.site.namespaces[namespace].id
		if nsid == 6 or nsid == 14 then
			colon = ':'
		end
	end
	colon = colon or ''

	-- Find the display value.
	if not display then
		local page, section = link:match('^(.-)#(.*)$')
		if page then
			display = page .. ' § ' .. section
		end
	end

	-- Assemble the link.
	if display then
		return string.format('[[%s%s|%s]]', colon, link, display)
	else
		return string.format('[[%s%s]]', colon, link)
	end
end

local function makeWikitextError(msg)
	-- Formats an error message to be returned to wikitext.
	return string.format('<strong class="error">Error: %s.</strong>', msg)
end

--------------------------------------------------------------------------------
-- Hatnote
--
-- Produces standard hatnote text. Implements the {{hatnote}} template.
--------------------------------------------------------------------------------

function p._hatnote(s)
	return string.format('<div class="dablink">%s</div>', s)
end

function f.hatnote(args)
	local s = args[1]
	if not s then
		return makeWikitextError('no text specified')
	end
	return p._hatnote(s)
end

p.hatnote = makeInvokeFunction(f.hatnote)

--------------------------------------------------------------------------------
-- Rellink
--
-- Produces a standard link to a related article. Implements the {{rellink}}
-- template.
--------------------------------------------------------------------------------

function p._rellink(s, extraclasses)
	if extraclasses then
		extraclasses = ' ' .. extraclasses
	else
		extraclasses = ''
	end
	return string.format('<div class="rellink%s">%s</div>', extraclasses, s)
end

function f.rellink(args)
	local s = args[1]
	local extraclasses = args.extraclasses
	if not s then
		return makeWikitextError('no text specified')
	end
	return p._rellink(s, extraclasses)
end

p.rellink = makeInvokeFunction(f.rellink)

return p