Module:Hatnote

--                             Module:Hatnote                                -- --                                                                           -- -- This module produces hatnote links and links to related articles. It      -- -- implements the and  meta-templates, and includes    -- -- helper functions for other Lua modules to format hatnote links. --

local libraryUtil = require('libraryUtil') local checkType = libraryUtil.checkType local mArguments -- lazily initialise Module:Arguments

local p = {}

-- Helper functions

local function getArgs(frame) -- Fetches the arguments from the parent frame. Whitespace is trimmed and -- blanks are removed. mArguments = require('Module:Arguments') return mArguments.getArgs(frame, {parentOnly = true}) end

local function removeInitialColon(s) -- Removes the initial colon from a string, if present. return s:match('^:?(.*)') end

function p._findNamespaceId(link, removeColon) -- Finds the namespace id (namespace number) of a link or a pagename. This -- function will not work if the link is enclosed in double brackets. Colons -- are trimmed from the start of the link by default. To skip colon -- trimming, set the removeColon parameter to true. checkType('_findNamespaceId', 1, link, 'string') checkType('_findNamespaceId', 2, removeColon, 'boolean', true) if removeColon ~= false then link = removeInitialColon(link) end local namespace = link:match('^(.-):') if namespace then local nsTable = mw.site.namespaces[namespace] if nsTable then return nsTable.id		end end return 0 end

function p._formatPages(...) -- Formats a list of pages using formatLink and returns it as an array. Nil -- values are not allowed. local pages = {...} local ret = {} for i, page in ipairs(pages) do		ret[i] = p._formatLink(page) end return ret end

function p._formatPageTables(...) -- Takes a list of page/display tables and returns it as a list of -- formatted links. Nil values are not allowed. local pages = {...} local links = {} for i, t in ipairs(pages) do		if type(t) ~= 'table' then error(string.format( "bad argument #%d to '_formatPageTables' (table expected, got %s)", i, type(t) ), 2)		end local link = t[1] local display = t[2] links[i] = p._formatLink(link, display) end return links end

function p._makeWikitextError(msg) -- Formats an error message to be returned to wikitext. checkType('_makeWikitextError', 1, msg, 'string') return string.format(' Error: %s. ', msg) end

-- Format link -- -- 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 "#".

function p.formatLink(frame) local args = getArgs(frame) local link = args[1] local display = args[2] if not link then return p._makeWikitextError('no link specified') end return p._formatLink(link, display) end

function p._formatLink(link, display) -- 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. checkType('_formatLink', 1, link, 'string') checkType('_formatLink', 2, display, 'string', true) link = removeInitialColon(link) local namespace = p._findNamespaceId(link, false) local colon if namespace == 6 or namespace == 14 then colon = ':' else colon = '' end

-- 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', colon, link, display) else return string.format('%s%s', colon, link) end end

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

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

function p._hatnote(s) checkType('_hatnote', 1, s, 'string') return string.format(' %s ', s) end

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

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

function p._rellink(s, extraclasses) checkType('_rellink', 1, s, 'string') checkType('_rellink', 2, extraclasses, 'string', true) if extraclasses then extraclasses = ' ' .. extraclasses else extraclasses = '' end return string.format(' %s ', extraclasses, s) end

return p