Difference between revisions of "Module:Documentation"

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46 year-old Teacher of the Picture Impaired Tulley from Campbell River, has hobbies such as model railways, garcinia cambogia reviews from real people and dominoes. Recently had a family voyage to Uvs Nuur Basin.<br><br>Feel free to surf to my web page ... [http://del.icio.us/premiumgc garcinia cambogia fruit where to buy in south africa]
+
-- This module implements {{documentation}}.
 +
 
 +
-- Get required modules.
 +
local getArgs = require('Module:Arguments').getArgs
 +
local messageBox = require('Module:Message box')
 +
 
 +
-- Get the config table.
 +
local cfg = mw.loadData('Module:Documentation/config')
 +
local i18n = mw.loadData('Module:Documentation/i18n')
 +
local p = {}
 +
 
 +
-- Often-used functions.
 +
local ugsub = mw.ustring.gsub
 +
 
 +
----------------------------------------------------------------------------
 +
-- Helper functions
 +
--
 +
-- These are defined as local functions, but are made available in the p
 +
-- table for testing purposes.
 +
----------------------------------------------------------------------------
 +
 
 +
local function message(cfgKey, valArray, expectType)
 +
--[[
 +
-- Gets a message from the cfg table and formats it if appropriate.
 +
-- The function raises an error if the value from the cfg table is not
 +
-- of the type expectType. The default type for expectType is 'string'.
 +
-- If the table valArray is present, strings such as $1, $2 etc. in the
 +
-- message are substituted with values from the table keys [1], [2] etc.
 +
-- For example, if the message "foo-message" had the value 'Foo $2 bar $1.',
 +
-- message('foo-message', {'baz', 'qux'}) would return "Foo qux bar baz."
 +
--]]
 +
local msg = cfg[cfgKey]
 +
expectType = expectType or 'string'
 +
if type(msg) ~= expectType then
 +
error(require('Module:TNT').format('I18n/Documentation', 'cfg-error-msg-type', cfgKey, expectType, type(msg)), 2)
 +
end
 +
if not valArray then
 +
return msg
 +
end
 +
 
 +
local function getMessageVal(match)
 +
match = tonumber(match)
 +
return valArray[match] or error(require('Module:TNT').format('I18n/Documentation', 'cfg-error-msg-empty', '$' .. match, cfgKey), 4)
 +
end
 +
 
 +
local ret = ugsub(msg, '$([1-9][0-9]*)', getMessageVal)
 +
return ret
 +
end
 +
 
 +
p.message = message
 +
 
 +
local function makeWikilink(page, display)
 +
if display then
 +
return mw.ustring.format('[[%s|%s]]', page, display)
 +
else
 +
return mw.ustring.format('[[%s]]', page)
 +
end
 +
end
 +
 
 +
p.makeWikilink = makeWikilink
 +
 
 +
local function makeCategoryLink(cat, sort)
 +
local catns = mw.site.namespaces[14].name
 +
return makeWikilink(catns .. ':' .. cat, sort)
 +
end
 +
 
 +
p.makeCategoryLink = makeCategoryLink
 +
 
 +
local function makeUrlLink(url, display)
 +
return mw.ustring.format('[%s %s]', url, display)
 +
end
 +
 
 +
p.makeUrlLink = makeUrlLink
 +
 
 +
local function makeToolbar(...)
 +
local ret = {}
 +
local lim = select('#', ...)
 +
if lim < 1 then
 +
return nil
 +
end
 +
for i = 1, lim do
 +
ret[#ret + 1] = select(i, ...)
 +
end
 +
return '<small style="font-style: normal;">(' .. table.concat(ret, ' &#124; ') .. ')</small>'
 +
end
 +
 
 +
p.makeToolbar = makeToolbar
 +
 
 +
----------------------------------------------------------------------------
 +
-- Argument processing
 +
----------------------------------------------------------------------------
 +
 
 +
local function makeInvokeFunc(funcName)
 +
return function (frame)
 +
local args = getArgs(frame, {
 +
valueFunc = function (key, value)
 +
if type(value) == 'string' then
 +
value = value:match('^%s*(.-)%s*$') -- Remove whitespace.
 +
if key == 'heading' or value ~= '' then
 +
return value
 +
else
 +
return nil
 +
end
 +
else
 +
return value
 +
end
 +
end
 +
})
 +
return p[funcName](args)
 +
end
 +
end
 +
 
 +
----------------------------------------------------------------------------
 +
-- Load TemplateStyles
 +
----------------------------------------------------------------------------
 +
 
 +
p.main = function(frame)
 +
local parent = frame.getParent(frame)
 +
local output = p._main(parent.args)
 +
return frame:extensionTag{ name='templatestyles', args = { src= message('templatestyles-scr') } } .. frame:preprocess(output)
 +
end
 +
 
 +
----------------------------------------------------------------------------
 +
-- Main function
 +
----------------------------------------------------------------------------
 +
 
 +
function p._main(args)
 +
--[[
 +
-- This function defines logic flow for the module.
 +
-- @args - table of arguments passed by the user
 +
--
 +
-- Messages:
 +
-- 'main-div-id' --> 'template-documentation'
 +
-- 'main-div-classes' --> 'template-documentation iezoomfix'
 +
--]]
 +
local env = p.getEnvironment(args)
 +
local root = mw.html.create()
 +
root
 +
:wikitext(p.protectionTemplate(env))
 +
:wikitext(p.sandboxNotice(args, env))
 +
-- This div tag is from {{documentation/start box}}, but moving it here
 +
-- so that we don't have to worry about unclosed tags.
 +
:tag('div')
 +
:attr('id', message('main-div-id'))
 +
:addClass(message('main-div-class'))
 +
:wikitext(p._startBox(args, env))
 +
:wikitext(p._content(args, env))
 +
:done()
 +
:wikitext(p._endBox(args, env))
 +
:wikitext(p.addTrackingCategories(env))
 +
return tostring(root)
 +
end
 +
 
 +
----------------------------------------------------------------------------
 +
-- Environment settings
 +
----------------------------------------------------------------------------
 +
 
 +
function p.getEnvironment(args)
 +
--[[
 +
-- Returns a table with information about the environment, including title objects and other namespace- or
 +
-- path-related data.
 +
-- @args - table of arguments passed by the user
 +
--
 +
-- Title objects include:
 +
-- env.title - the page we are making documentation for (usually the current title)
 +
-- env.templateTitle - the template (or module, file, etc.)
 +
-- env.docTitle - the /doc subpage.
 +
-- env.sandboxTitle - the /sandbox subpage.
 +
-- env.testcasesTitle - the /testcases subpage.
 +
-- env.printTitle - the print version of the template, located at the /Print subpage.
 +
--
 +
-- Data includes:
 +
-- env.protectionLevels - the protection levels table of the title object.
 +
-- env.subjectSpace - the number of the title's subject namespace.
 +
-- env.docSpace - the number of the namespace the title puts its documentation in.
 +
-- env.docpageBase - the text of the base page of the /doc, /sandbox and /testcases pages, with namespace.
 +
-- env.compareUrl - URL of the Special:ComparePages page comparing the sandbox with the template.
 +
--
 +
-- All table lookups are passed through pcall so that errors are caught. If an error occurs, the value
 +
-- returned will be nil.
 +
--]]
 +
 +
local env, envFuncs = {}, {}
 +
 
 +
-- Set up the metatable. If triggered we call the corresponding function in the envFuncs table. The value
 +
-- returned by that function is memoized in the env table so that we don't call any of the functions
 +
-- more than once. (Nils won't be memoized.)
 +
setmetatable(env, {
 +
__index = function (t, key)
 +
local envFunc = envFuncs[key]
 +
if envFunc then
 +
local success, val = pcall(envFunc)
 +
if success then
 +
env[key] = val -- Memoise the value.
 +
return val
 +
end
 +
end
 +
return nil
 +
end
 +
})
 +
 
 +
function envFuncs.title()
 +
-- The title object for the current page, or a test page passed with args.page.
 +
local title
 +
local titleArg = args.page
 +
if titleArg then
 +
title = mw.title.new(titleArg)
 +
else
 +
title = mw.title.getCurrentTitle()
 +
end
 +
return title
 +
end
 +
 
 +
function envFuncs.templateTitle()
 +
--[[
 +
-- The template (or module, etc.) title object.
 +
-- Messages:
 +
-- 'sandbox-subpage' --> 'sandbox'
 +
-- 'testcases-subpage' --> 'testcases'
 +
--]]
 +
local subjectSpace = env.subjectSpace
 +
local title = env.title
 +
local subpage = title.subpageText
 +
if subpage == message('sandbox-subpage') or subpage == message('testcases-subpage') then
 +
return mw.title.makeTitle(subjectSpace, title.baseText)
 +
else
 +
return mw.title.makeTitle(subjectSpace, title.text)
 +
end
 +
end
 +
 
 +
function envFuncs.docTitle()
 +
--[[
 +
-- Title object of the /doc subpage.
 +
-- Messages:
 +
-- 'doc-subpage' --> 'doc'
 +
--]]
 +
local title = env.title
 +
local docname = args[1] -- User-specified doc page.
 +
local docpage
 +
if docname then
 +
docpage = docname
 +
else
 +
docpage = env.docpageBase .. '/' .. message('doc-subpage')
 +
end
 +
return mw.title.new(docpage)
 +
end
 +
 +
function envFuncs.sandboxTitle()
 +
--[[
 +
-- Title object for the /sandbox subpage.
 +
-- Messages:
 +
-- 'sandbox-subpage' --> 'sandbox'
 +
--]]
 +
return mw.title.new(env.docpageBase .. '/' .. message('sandbox-subpage'))
 +
end
 +
 +
function envFuncs.testcasesTitle()
 +
--[[
 +
-- Title object for the /testcases subpage.
 +
-- Messages:
 +
-- 'testcases-subpage' --> 'testcases'
 +
--]]
 +
return mw.title.new(env.docpageBase .. '/' .. message('testcases-subpage'))
 +
end
 +
 +
function envFuncs.printTitle()
 +
--[[
 +
-- Title object for the /Print subpage.
 +
-- Messages:
 +
-- 'print-subpage' --> 'Print'
 +
--]]
 +
return env.templateTitle:subPageTitle(message('print-subpage'))
 +
end
 +
 
 +
function envFuncs.protectionLevels()
 +
-- The protection levels table of the title object.
 +
return env.title.protectionLevels
 +
end
 +
 
 +
function envFuncs.subjectSpace()
 +
-- The subject namespace number.
 +
return mw.site.namespaces[env.title.namespace].subject.id
 +
end
 +
 
 +
function envFuncs.docSpace()
 +
-- The documentation namespace number. For most namespaces this is the same as the
 +
-- subject namespace. However, pages in the Article, File, MediaWiki or Category
 +
-- namespaces must have their /doc, /sandbox and /testcases pages in talk space.
 +
local subjectSpace = env.subjectSpace
 +
if subjectSpace == 0 or subjectSpace == 6 or subjectSpace == 8 or subjectSpace == 14 then
 +
return subjectSpace + 1
 +
else
 +
return subjectSpace
 +
end
 +
end
 +
 
 +
function envFuncs.docpageBase()
 +
-- The base page of the /doc, /sandbox, and /testcases subpages.
 +
-- For some namespaces this is the talk page, rather than the template page.
 +
local templateTitle = env.templateTitle
 +
local docSpace = env.docSpace
 +
local docSpaceText = mw.site.namespaces[docSpace].name
 +
-- Assemble the link. docSpace is never the main namespace, so we can hardcode the colon.
 +
return docSpaceText .. ':' .. templateTitle.text
 +
end
 +
 +
function envFuncs.compareUrl()
 +
-- Diff link between the sandbox and the main template using [[Special:ComparePages]].
 +
local templateTitle = env.templateTitle
 +
local sandboxTitle = env.sandboxTitle
 +
if templateTitle.exists and sandboxTitle.exists then
 +
local compareUrl = mw.uri.fullUrl(
 +
'Special:ComparePages',
 +
{page1 = templateTitle.prefixedText, page2 = sandboxTitle.prefixedText}
 +
)
 +
return tostring(compareUrl)
 +
else
 +
return nil
 +
end
 +
end
 +
 
 +
return env
 +
end
 +
 
 +
----------------------------------------------------------------------------
 +
-- Auxiliary templates
 +
----------------------------------------------------------------------------
 +
 
 +
function p.sandboxNotice(args, env)
 +
--[=[
 +
-- Generates a sandbox notice for display above sandbox pages.
 +
-- @args - a table of arguments passed by the user
 +
-- @env - environment table containing title objects, etc., generated with p.getEnvironment
 +
--
 +
-- Messages:
 +
-- 'sandbox-notice-image' --> '[[Image:Sandbox.svg|50px|alt=|link=]]'
 +
-- 'sandbox-notice-blurb' --> 'This is the $1 for $2.'
 +
-- 'sandbox-notice-diff-blurb' --> 'This is the $1 for $2 ($3).'
 +
-- 'sandbox-notice-pagetype-template' --> '[[w:Wikipedia:Template test cases|template sandbox]] page'
 +
-- 'sandbox-notice-pagetype-module' --> '[[w:Wikipedia:Template test cases|module sandbox]] page'
 +
-- 'sandbox-notice-pagetype-other' --> 'sandbox page'
 +
-- 'sandbox-notice-compare-link-display' --> 'diff'
 +
-- 'sandbox-notice-testcases-blurb' --> 'See also the companion subpage for $1.'
 +
-- 'sandbox-notice-testcases-link-display' --> 'test cases'
 +
-- 'sandbox-category' --> 'Template sandboxes'
 +
--]=]
 +
local title = env.title
 +
local sandboxTitle = env.sandboxTitle
 +
local templateTitle = env.templateTitle
 +
local subjectSpace = env.subjectSpace
 +
if not (subjectSpace and title and sandboxTitle and templateTitle and mw.title.equals(title, sandboxTitle)) then
 +
return nil
 +
end
 +
-- Build the table of arguments to pass to {{ombox}}. We need just two fields, "image" and "text".
 +
local omargs = {}
 +
omargs.image = message('sandbox-notice-image')
 +
-- Get the text. We start with the opening blurb, which is something like
 +
-- "This is the template sandbox for [[Template:Foo]] (diff)."
 +
local text = ''
 +
local frame = mw.getCurrentFrame()
 +
local isPreviewing = frame:preprocess('{{REVISIONID}}') == '' -- True if the page is being previewed.
 +
local pagetype
 +
if subjectSpace == 10 then
 +
pagetype = message('sandbox-notice-pagetype-template')
 +
elseif subjectSpace == 828 then
 +
pagetype = message('sandbox-notice-pagetype-module')
 +
else
 +
pagetype = message('sandbox-notice-pagetype-other')
 +
end
 +
local templateLink = makeWikilink(templateTitle.prefixedText)
 +
local compareUrl = env.compareUrl
 +
if isPreviewing or not compareUrl then
 +
text = text .. message('sandbox-notice-blurb', {pagetype, templateLink})
 +
else
 +
local compareDisplay = message('sandbox-notice-compare-link-display')
 +
local compareLink = makeUrlLink(compareUrl, compareDisplay)
 +
text = text .. message('sandbox-notice-diff-blurb', {pagetype, templateLink, compareLink})
 +
end
 +
-- Get the test cases page blurb if the page exists. This is something like
 +
-- "See also the companion subpage for [[Template:Foo/testcases|test cases]]."
 +
local testcasesTitle = env.testcasesTitle
 +
if testcasesTitle and testcasesTitle.exists then
 +
if testcasesTitle.contentModel == "Scribunto" then
 +
local testcasesLinkDisplay = message('sandbox-notice-testcases-link-display')
 +
local testcasesRunLinkDisplay = message('sandbox-notice-testcases-run-link-display')
 +
local testcasesLink = makeWikilink(testcasesTitle.prefixedText, testcasesLinkDisplay)
 +
local testcasesRunLink = makeWikilink(testcasesTitle.talkPageTitle.prefixedText, testcasesRunLinkDisplay)
 +
text = text .. '<br />' .. message('sandbox-notice-testcases-run-blurb', {testcasesLink, testcasesRunLink})
 +
else
 +
local testcasesLinkDisplay = message('sandbox-notice-testcases-link-display')
 +
local testcasesLink = makeWikilink(testcasesTitle.prefixedText, testcasesLinkDisplay)
 +
text = text .. '<br />' .. message('sandbox-notice-testcases-blurb', {testcasesLink})
 +
end
 +
end
 +
-- Add the sandbox to the sandbox category.
 +
text = text .. makeCategoryLink(message('sandbox-category'))
 +
omargs.text = text
 +
omargs.class = message('sandbox-class')
 +
local ret = '<div style="clear: both;"></div>'
 +
ret = ret .. messageBox.main('ombox', omargs)
 +
return ret
 +
end
 +
 
 +
function p.protectionTemplate(env)
 +
-- Generates the padlock icon in the top right.
 +
-- @env - environment table containing title objects, etc., generated with p.getEnvironment
 +
-- Messages:
 +
-- 'protection-template' --> 'pp-template'
 +
-- 'protection-template-args' --> {docusage = 'yes'}
 +
local title = env.title
 +
local protectionLevels
 +
local protectionTemplate = message('protection-template')
 +
local namespace = title.namespace
 +
if not (protectionTemplate and (namespace == 10 or namespace == 828)) then
 +
-- Don't display the protection template if we are not in the template or module namespaces.
 +
return nil
 +
end
 +
protectionLevels = env.protectionLevels
 +
if not protectionLevels then
 +
return nil
 +
end
 +
local editLevels = protectionLevels.edit
 +
local moveLevels = protectionLevels.move
 +
if moveLevels and moveLevels[1] == 'sysop' or editLevels and editLevels[1] then
 +
-- The page is full-move protected, or full, template, or semi-protected.
 +
local frame = mw.getCurrentFrame()
 +
return frame:expandTemplate{title = protectionTemplate, args = message('protection-template-args', nil, 'table')}
 +
else
 +
return nil
 +
end
 +
end
 +
 
 +
----------------------------------------------------------------------------
 +
-- Start box
 +
----------------------------------------------------------------------------
 +
 
 +
p.startBox = makeInvokeFunc('_startBox')
 +
 
 +
function p._startBox(args, env)
 +
--[[
 +
-- This function generates the start box.
 +
-- @args - a table of arguments passed by the user
 +
-- @env - environment table containing title objects, etc., generated with p.getEnvironment
 +
--
 +
-- The actual work is done by p.makeStartBoxLinksData and p.renderStartBoxLinks which make
 +
-- the [view] [edit] [history] [purge] links, and by p.makeStartBoxData and p.renderStartBox
 +
-- which generate the box HTML.
 +
--]]
 +
env = env or p.getEnvironment(args)
 +
local links
 +
local content = args.content
 +
if not content then
 +
-- No need to include the links if the documentation is on the template page itself.
 +
local linksData = p.makeStartBoxLinksData(args, env)
 +
if linksData then
 +
links = p.renderStartBoxLinks(linksData)
 +
end
 +
end
 +
-- Generate the start box html.
 +
local data = p.makeStartBoxData(args, env, links)
 +
if data then
 +
return p.renderStartBox(data)
 +
else
 +
-- User specified no heading.
 +
return nil
 +
end
 +
end
 +
 
 +
function p.makeStartBoxLinksData(args, env)
 +
--[[
 +
-- Does initial processing of data to make the [view] [edit] [history] [purge] links.
 +
-- @args - a table of arguments passed by the user
 +
-- @env - environment table containing title objects, etc., generated with p.getEnvironment
 +
--
 +
-- Messages:
 +
-- 'view-link-display' --> 'view'
 +
-- 'edit-link-display' --> 'edit'
 +
-- 'history-link-display' --> 'history'
 +
-- 'purge-link-display' --> 'purge'
 +
-- 'file-docpage-preload' --> 'Template:Documentation/preload-filespace'
 +
-- 'module-preload' --> 'Template:Documentation/preload-module-doc'
 +
-- 'docpage-preload' --> 'Template:Documentation/preload'
 +
-- 'create-link-display' --> 'create'
 +
--]]
 +
local subjectSpace = env.subjectSpace
 +
local title = env.title
 +
local docTitle = env.docTitle
 +
if not title or not docTitle then
 +
return nil
 +
end
 +
if docTitle.isRedirect then
 +
docTitle = docTitle.redirectTarget
 +
end
 +
 
 +
local data = {}
 +
data.title = title
 +
data.docTitle = docTitle
 +
-- View, display, edit, and purge links if /doc exists.
 +
data.viewLinkDisplay = i18n['view-link-display']
 +
data.editLinkDisplay = i18n['edit-link-display']
 +
data.historyLinkDisplay = i18n['history-link-display']
 +
data.purgeLinkDisplay = i18n['purge-link-display']
 +
-- Create link if /doc doesn't exist.
 +
local preload = args.preload
 +
if not preload then
 +
if subjectSpace == 6 then -- File namespace
 +
preload = message('file-docpage-preload')
 +
elseif subjectSpace == 828 then -- Module namespace
 +
preload = message('module-preload')
 +
else
 +
preload = message('docpage-preload')
 +
end
 +
end
 +
data.preload = preload
 +
data.createLinkDisplay = i18n['create-link-display']
 +
return data
 +
end
 +
 
 +
function p.renderStartBoxLinks(data)
 +
--[[
 +
-- Generates the [view][edit][history][purge] or [create] links from the data table.
 +
-- @data - a table of data generated by p.makeStartBoxLinksData
 +
--]]
 +
 +
local function escapeBrackets(s)
 +
-- Escapes square brackets with HTML entities.
 +
s = s:gsub('%[', '&#91;') -- Replace square brackets with HTML entities.
 +
s = s:gsub('%]', '&#93;')
 +
return s
 +
end
 +
 
 +
local ret
 +
local docTitle = data.docTitle
 +
local title = data.title
 +
if docTitle.exists then
 +
local viewLink = makeWikilink(docTitle.prefixedText, data.viewLinkDisplay)
 +
local editLink = makeUrlLink(docTitle:fullUrl{action = 'edit'}, data.editLinkDisplay)
 +
local historyLink = makeUrlLink(docTitle:fullUrl{action = 'history'}, data.historyLinkDisplay)
 +
local purgeLink = makeUrlLink(title:fullUrl{action = 'purge'}, data.purgeLinkDisplay)
 +
ret = '[%s] [%s] [%s] [%s]'
 +
ret = escapeBrackets(ret)
 +
ret = mw.ustring.format(ret, viewLink, editLink, historyLink, purgeLink)
 +
else
 +
local createLink = makeUrlLink(docTitle:fullUrl{action = 'edit', preload = data.preload}, data.createLinkDisplay)
 +
ret = '[%s]'
 +
ret = escapeBrackets(ret)
 +
ret = mw.ustring.format(ret, createLink)
 +
end
 +
return ret
 +
end
 +
 
 +
function p.makeStartBoxData(args, env, links)
 +
--[=[
 +
-- Does initial processing of data to pass to the start-box render function, p.renderStartBox.
 +
-- @args - a table of arguments passed by the user
 +
-- @env - environment table containing title objects, etc., generated with p.getEnvironment
 +
-- @links - a string containing the [view][edit][history][purge] links - could be nil if there's an error.
 +
--
 +
-- Messages:
 +
-- 'documentation-icon-wikitext' --> '[[File:Test Template Info-Icon - Version (2).svg|50px|link=|alt=Documentation icon]]'
 +
-- 'template-namespace-heading' --> 'Template documentation'
 +
-- 'module-namespace-heading' --> 'Module documentation'
 +
-- 'file-namespace-heading' --> 'Summary'
 +
-- 'other-namespaces-heading' --> 'Documentation'
 +
-- 'start-box-linkclasses' --> 'mw-editsection-like plainlinks'
 +
-- 'start-box-link-id' --> 'doc_editlinks'
 +
-- 'testcases-create-link-display' --> 'create'
 +
--]=]
 +
local subjectSpace = env.subjectSpace
 +
if not subjectSpace then
 +
-- Default to an "other namespaces" namespace, so that we get at least some output
 +
-- if an error occurs.
 +
subjectSpace = 2
 +
end
 +
local data = {}
 +
 +
-- Heading
 +
local heading = args.heading -- Blank values are not removed.
 +
if heading == '' then
 +
-- Don't display the start box if the heading arg is defined but blank.
 +
return nil
 +
end
 +
if heading then
 +
data.heading = heading
 +
elseif subjectSpace == 10 then -- Template namespace
 +
data.heading = i18n['template-namespace-heading']
 +
elseif subjectSpace == 828 then -- Module namespace
 +
data.heading = i18n['module-namespace-heading']
 +
elseif subjectSpace == 6 then -- File namespace
 +
data.heading = i18n['file-namespace-heading']
 +
else
 +
data.heading = i18n['other-namespaces-heading']
 +
end
 +
 +
-- Data for the [view][edit][history][purge] or [create] links.
 +
if links then
 +
data.linksClass = message('start-box-linkclasses')
 +
data.linksId = message('start-box-link-id')
 +
data.links = links
 +
end
 +
 +
return data
 +
end
 +
 
 +
function p.renderStartBox(data)
 +
-- Renders the start box html.
 +
-- @data - a table of data generated by p.makeStartBoxData.
 +
local sbox = mw.html.create('div')
 +
sbox
 +
:addClass(message('header-div-class'))
 +
:tag('div')
 +
:addClass(message('heading-div-class'))
 +
:wikitext(data.heading)
 +
local links = data.links
 +
if links then
 +
sbox
 +
:tag('div')
 +
:addClass(data.linksClass)
 +
:attr('id', data.linksId)
 +
:wikitext(links)
 +
end
 +
return tostring(sbox)
 +
end
 +
 
 +
----------------------------------------------------------------------------
 +
-- Documentation content
 +
----------------------------------------------------------------------------
 +
 
 +
p.content = makeInvokeFunc('_content')
 +
 
 +
function p._content(args, env)
 +
-- Displays the documentation contents
 +
-- @args - a table of arguments passed by the user
 +
-- @env - environment table containing title objects, etc., generated with p.getEnvironment
 +
env = env or p.getEnvironment(args)
 +
local docTitle = env.docTitle
 +
local content = args.content
 +
if not content and docTitle and docTitle.exists then
 +
content = args._content or mw.getCurrentFrame():expandTemplate{title = docTitle.prefixedText}
 +
end
 +
-- The line breaks below are necessary so that "=== Headings ===" at the start and end
 +
-- of docs are interpreted correctly.
 +
local cbox = mw.html.create('div')
 +
cbox
 +
:addClass(message('content-div-class'))
 +
:wikitext('\n' .. (content or '') .. '\n')
 +
return tostring(cbox)
 +
end
 +
 
 +
p.contentTitle = makeInvokeFunc('_contentTitle')
 +
 
 +
function p._contentTitle(args, env)
 +
env = env or p.getEnvironment(args)
 +
local docTitle = env.docTitle
 +
if not args.content and docTitle and docTitle.exists then
 +
return docTitle.prefixedText
 +
else
 +
return ''
 +
end
 +
end
 +
 
 +
----------------------------------------------------------------------------
 +
-- End box
 +
----------------------------------------------------------------------------
 +
 
 +
p.endBox = makeInvokeFunc('_endBox')
 +
 
 +
function p._endBox(args, env)
 +
--[=[
 +
-- This function generates the end box (also known as the link box).
 +
-- @args - a table of arguments passed by the user
 +
-- @env - environment table containing title objects, etc., generated with p.getEnvironment
 +
--]=]
 +
 +
-- Get environment data.
 +
env = env or p.getEnvironment(args)
 +
local subjectSpace = env.subjectSpace
 +
local docTitle = env.docTitle
 +
if not subjectSpace or not docTitle then
 +
return nil
 +
end
 +
 +
-- Check whether we should output the end box at all. Add the end
 +
-- box by default if the documentation exists or if we are in the
 +
-- user, module or template namespaces.
 +
local linkBox = args['link box']
 +
if linkBox == 'off'
 +
or not (
 +
docTitle.exists
 +
or subjectSpace == 2
 +
or subjectSpace == 828
 +
or subjectSpace == 10
 +
)
 +
then
 +
return nil
 +
end
 +
 
 +
-- Assemble the footer text field.
 +
local text = ''
 +
if linkBox then
 +
text = text .. linkBox
 +
else
 +
text = text .. (p.makeDocPageBlurb(args, env) or '') -- "This documentation is transcluded from [[Foo]]."
 +
if subjectSpace == 2 or subjectSpace == 10 or subjectSpace == 828 then
 +
-- We are in the user, template or module namespaces.
 +
-- Add sandbox and testcases links.
 +
-- "Editors can experiment in this template's sandbox and testcases pages."
 +
text = text .. (p.makeExperimentBlurb(args, env) or '')
 +
text = text .. '<br />'
 +
if not args.content and not args[1] then
 +
-- "Please add categories to the /doc subpage."
 +
-- Don't show this message with inline docs or with an explicitly specified doc page,
 +
-- as then it is unclear where to add the categories.
 +
text = text .. (p.makeCategoriesBlurb(args, env) or '')
 +
end
 +
text = text .. ' ' .. (p.makeSubpagesBlurb(args, env) or '') --"Subpages of this template"
 +
local printBlurb = p.makePrintBlurb(args, env) -- Two-line blurb about print versions of templates.
 +
if printBlurb then
 +
text = text .. '<br />' .. printBlurb
 +
end
 +
end
 +
end
 +
 
 +
local ebox = mw.html.create('div')
 +
ebox
 +
:addClass(message('footer-div-class'))
 +
:wikitext(text)
 +
return tostring(ebox)
 +
end
 +
 
 +
function p.makeDocPageBlurb(args, env)
 +
--[=[
 +
-- Makes the blurb "This documentation is transcluded from [[Template:Foo]] (edit, history)".
 +
-- @args - a table of arguments passed by the user
 +
-- @env - environment table containing title objects, etc., generated with p.getEnvironment
 +
--
 +
-- Messages:
 +
-- 'edit-link-display' --> 'edit'
 +
-- 'history-link-display' --> 'history'
 +
-- 'transcluded-from-blurb' -->
 +
-- 'The above [[Wikipedia:Template documentation|documentation]]
 +
-- is [[Wikipedia:Transclusion|transcluded]] from $1.'
 +
-- 'module-preload' --> 'Template:Documentation/preload-module-doc'
 +
-- 'create-link-display' --> 'create'
 +
-- 'create-module-doc-blurb' -->
 +
-- 'You might want to $1 a documentation page for this [[Wikipedia:Lua|Scribunto module]].'
 +
--]=]
 +
local docTitle = env.docTitle
 +
if not docTitle then
 +
return nil
 +
end
 +
local ret
 +
if docTitle.exists then
 +
-- /doc exists; link to it.
 +
local docLink = makeWikilink(docTitle.prefixedText)
 +
local editUrl = docTitle:fullUrl{action = 'edit'}
 +
local editDisplay = i18n['edit-link-display']
 +
local editLink = makeUrlLink(editUrl, editDisplay)
 +
local historyUrl = docTitle:fullUrl{action = 'history'}
 +
local historyDisplay = i18n['history-link-display']
 +
local historyLink = makeUrlLink(historyUrl, historyDisplay)
 +
ret = message('transcluded-from-blurb', {docLink})
 +
.. ' '
 +
.. makeToolbar(editLink, historyLink)
 +
.. '<br />'
 +
elseif env.subjectSpace == 828 then
 +
-- /doc does not exist; ask to create it.
 +
local createUrl = docTitle:fullUrl{action = 'edit', preload = message('module-preload')}
 +
local createDisplay = i18n['create-link-display']
 +
local createLink = makeUrlLink(createUrl, createDisplay)
 +
ret = message('create-module-doc-blurb', {createLink})
 +
.. '<br />'
 +
end
 +
return ret
 +
end
 +
 
 +
function p.makeExperimentBlurb(args, env)
 +
--[[
 +
-- Renders the text "Editors can experiment in this template's sandbox (edit | diff) and testcases (edit) pages."
 +
-- @args - a table of arguments passed by the user
 +
-- @env - environment table containing title objects, etc., generated with p.getEnvironment
 +
--
 +
-- Messages:
 +
-- 'sandbox-link-display' --> 'sandbox'
 +
-- 'sandbox-edit-link-display' --> 'edit'
 +
-- 'compare-link-display' --> 'diff'
 +
-- 'module-sandbox-preload' --> 'Template:Documentation/preload-module-sandbox'
 +
-- 'template-sandbox-preload' --> 'Template:Documentation/preload-sandbox'
 +
-- 'sandbox-create-link-display' --> 'create'
 +
-- 'mirror-edit-summary' --> 'Create sandbox version of $1'
 +
-- 'mirror-link-display' --> 'mirror'
 +
-- 'mirror-link-preload' --> 'Template:Documentation/mirror'
 +
-- 'sandbox-link-display' --> 'sandbox'
 +
-- 'testcases-link-display' --> 'testcases'
 +
-- 'testcases-edit-link-display'--> 'edit'
 +
-- 'template-sandbox-preload' --> 'Template:Documentation/preload-sandbox'
 +
-- 'testcases-create-link-display' --> 'create'
 +
-- 'testcases-link-display' --> 'testcases'
 +
-- 'testcases-edit-link-display' --> 'edit'
 +
-- 'module-testcases-preload' --> 'Template:Documentation/preload-module-testcases'
 +
-- 'template-testcases-preload' --> 'Template:Documentation/preload-testcases'
 +
-- 'experiment-blurb-module' --> 'Editors can experiment in this module's $1 and $2 pages.'
 +
-- 'experiment-blurb-template' --> 'Editors can experiment in this template's $1 and $2 pages.'
 +
--]]
 +
local subjectSpace = env.subjectSpace
 +
local templateTitle = env.templateTitle
 +
local sandboxTitle = env.sandboxTitle
 +
local testcasesTitle = env.testcasesTitle
 +
local templatePage = templateTitle.prefixedText
 +
if not subjectSpace or not templateTitle or not sandboxTitle or not testcasesTitle then
 +
return nil
 +
end
 +
-- Make links.
 +
local sandboxLinks, testcasesLinks
 +
if sandboxTitle.exists then
 +
local sandboxPage = sandboxTitle.prefixedText
 +
local sandboxDisplay = message('sandbox-link-display')
 +
local sandboxLink = makeWikilink(sandboxPage, sandboxDisplay)
 +
local sandboxEditUrl = sandboxTitle:fullUrl{action = 'edit'}
 +
local sandboxEditDisplay = message('sandbox-edit-link-display')
 +
local sandboxEditLink = makeUrlLink(sandboxEditUrl, sandboxEditDisplay)
 +
local compareUrl = env.compareUrl
 +
local compareLink
 +
if compareUrl then
 +
local compareDisplay = message('compare-link-display')
 +
compareLink = makeUrlLink(compareUrl, compareDisplay)
 +
end
 +
sandboxLinks = sandboxLink .. ' ' .. makeToolbar(sandboxEditLink, compareLink)
 +
else
 +
local sandboxPreload
 +
if subjectSpace == 828 then
 +
sandboxPreload = message('module-sandbox-preload')
 +
else
 +
sandboxPreload = message('template-sandbox-preload')
 +
end
 +
local sandboxCreateUrl = sandboxTitle:fullUrl{action = 'edit', preload = sandboxPreload}
 +
local sandboxCreateDisplay = message('sandbox-create-link-display')
 +
local sandboxCreateLink = makeUrlLink(sandboxCreateUrl, sandboxCreateDisplay)
 +
local mirrorSummary = message('mirror-edit-summary', {makeWikilink(templatePage)})
 +
local mirrorPreload = message('mirror-link-preload')
 +
local mirrorUrl = sandboxTitle:fullUrl{action = 'edit', preload = mirrorPreload, summary = mirrorSummary}
 +
local mirrorDisplay = message('mirror-link-display')
 +
local mirrorLink = makeUrlLink(mirrorUrl, mirrorDisplay)
 +
sandboxLinks = message('sandbox-link-display') .. ' ' .. makeToolbar(sandboxCreateLink, mirrorLink)
 +
end
 +
if testcasesTitle.exists then
 +
local testcasesPage = testcasesTitle.prefixedText
 +
local testcasesDisplay = message('testcases-link-display')
 +
local testcasesLink = makeWikilink(testcasesPage, testcasesDisplay)
 +
local testcasesEditUrl = testcasesTitle:fullUrl{action = 'edit'}
 +
local testcasesEditDisplay = message('testcases-edit-link-display')
 +
local testcasesEditLink = makeUrlLink(testcasesEditUrl, testcasesEditDisplay)
 +
testcasesLinks = testcasesLink .. ' ' .. makeToolbar(testcasesEditLink)
 +
else
 +
local testcasesPreload
 +
if subjectSpace == 828 then
 +
testcasesPreload = message('module-testcases-preload')
 +
else
 +
testcasesPreload = message('template-testcases-preload')
 +
end
 +
local testcasesCreateUrl = testcasesTitle:fullUrl{action = 'edit', preload = testcasesPreload}
 +
local testcasesCreateDisplay = message('testcases-create-link-display')
 +
local testcasesCreateLink = makeUrlLink(testcasesCreateUrl, testcasesCreateDisplay)
 +
testcasesLinks = message('testcases-link-display') .. ' ' .. makeToolbar(testcasesCreateLink)
 +
end
 +
local messageName
 +
if subjectSpace == 828 then
 +
messageName = 'experiment-blurb-module'
 +
else
 +
messageName = 'experiment-blurb-template'
 +
end
 +
return message(messageName, {sandboxLinks, testcasesLinks})
 +
end
 +
 
 +
function p.makeCategoriesBlurb(args, env)
 +
--[[
 +
-- Generates the text "Please add categories to the /doc subpage."
 +
-- @args - a table of arguments passed by the user
 +
-- @env - environment table containing title objects, etc., generated with p.getEnvironment
 +
-- Messages:
 +
-- 'doc-link-display' --> '/doc'
 +
-- 'add-categories-blurb' --> 'Please add categories to the $1 subpage.'
 +
--]]
 +
local docTitle = env.docTitle
 +
if not docTitle then
 +
return nil
 +
end
 +
local docPathLink = makeWikilink(docTitle.prefixedText, message('doc-link-display'))
 +
return message('add-categories-blurb', {docPathLink})
 +
end
 +
 
 +
function p.makeSubpagesBlurb(args, env)
 +
--[[
 +
-- Generates the "Subpages of this template" link.
 +
-- @args - a table of arguments passed by the user
 +
-- @env - environment table containing title objects, etc., generated with p.getEnvironment
 +
 +
-- Messages:
 +
-- 'template-pagetype' --> 'template'
 +
-- 'module-pagetype' --> 'module'
 +
-- 'default-pagetype' --> 'page'
 +
-- 'subpages-link-display' --> 'Subpages of this $1'
 +
--]]
 +
local subjectSpace = env.subjectSpace
 +
local templateTitle = env.templateTitle
 +
if not subjectSpace or not templateTitle then
 +
return nil
 +
end
 +
local pagetype
 +
if subjectSpace == 10 then
 +
pagetype = message('template-pagetype')
 +
elseif subjectSpace == 828 then
 +
pagetype = message('module-pagetype')
 +
else
 +
pagetype = message('default-pagetype')
 +
end
 +
local subpagesLink = makeWikilink(
 +
'Special:PrefixIndex/' .. templateTitle.prefixedText .. '/',
 +
message('subpages-link-display', {pagetype})
 +
)
 +
return message('subpages-blurb', {subpagesLink})
 +
end
 +
 
 +
function p.makePrintBlurb(args, env)
 +
--[=[
 +
-- Generates the blurb displayed when there is a print version of the template available.
 +
-- @args - a table of arguments passed by the user
 +
-- @env - environment table containing title objects, etc., generated with p.getEnvironment
 +
--
 +
-- Messages:
 +
-- 'print-link-display' --> '/Print'
 +
-- 'print-blurb' --> 'A [[Help:Books/for experts#Improving the book layout|print version]]'
 +
-- .. ' of this template exists at $1.'
 +
-- .. ' If you make a change to this template, please update the print version as well.'
 +
-- 'display-print-category' --> true
 +
-- 'print-category' --> 'Templates with print versions'
 +
--]=]
 +
local printTitle = env.printTitle
 +
if not printTitle then
 +
return nil
 +
end
 +
local ret
 +
if printTitle.exists then
 +
local printLink = makeWikilink(printTitle.prefixedText, message('print-link-display'))
 +
ret = message('print-blurb', {printLink})
 +
local displayPrintCategory = message('display-print-category', nil, 'boolean')
 +
if displayPrintCategory then
 +
ret = ret .. makeCategoryLink(message('print-category'))
 +
end
 +
end
 +
return ret
 +
end
 +
 
 +
----------------------------------------------------------------------------
 +
-- Tracking categories
 +
----------------------------------------------------------------------------
 +
 
 +
function p.addTrackingCategories(env)
 +
--[[
 +
-- Check if {{documentation}} is transcluded on a /doc or /testcases page.
 +
-- @env - environment table containing title objects, etc., generated with p.getEnvironment
 +
 +
-- Messages:
 +
-- 'display-strange-usage-category' --> true
 +
-- 'doc-subpage' --> 'doc'
 +
-- 'testcases-subpage' --> 'testcases'
 +
-- 'strange-usage-category' --> 'Wikipedia pages with strange ((documentation)) usage'
 +
--
 +
-- /testcases pages in the module namespace are not categorised, as they may have
 +
-- {{documentation}} transcluded automatically.
 +
--]]
 +
local title = env.title
 +
local subjectSpace = env.subjectSpace
 +
if not title or not subjectSpace then
 +
return nil
 +
end
 +
local subpage = title.subpageText
 +
local ret = ''
 +
if message('display-strange-usage-category', nil, 'boolean')
 +
and (
 +
subpage == message('doc-subpage')
 +
or subjectSpace ~= 828 and subpage == message('testcases-subpage')
 +
)
 +
then
 +
ret = ret .. makeCategoryLink(message('strange-usage-category'))
 +
end
 +
return ret
 +
end
 +
 
 +
return p

Latest revision as of 01:26, 5 November 2019

Documentation for this module may be created at Module:Documentation/doc

Script error: Lua error: Internal error: The interpreter has terminated with signal "11". 

-- This module implements {{documentation}}.

-- Get required modules.
local getArgs = require('Module:Arguments').getArgs
local messageBox = require('Module:Message box')

-- Get the config table.
local cfg = mw.loadData('Module:Documentation/config')
local i18n = mw.loadData('Module:Documentation/i18n')
local p = {}

-- Often-used functions.
local ugsub = mw.ustring.gsub

----------------------------------------------------------------------------
-- Helper functions
--
-- These are defined as local functions, but are made available in the p
-- table for testing purposes.
----------------------------------------------------------------------------

local function message(cfgKey, valArray, expectType)
	--[[
	-- Gets a message from the cfg table and formats it if appropriate.
	-- The function raises an error if the value from the cfg table is not
	-- of the type expectType. The default type for expectType is 'string'.
	-- If the table valArray is present, strings such as $1, $2 etc. in the
	-- message are substituted with values from the table keys [1], [2] etc.
	-- For example, if the message "foo-message" had the value 'Foo $2 bar $1.',
	-- message('foo-message', {'baz', 'qux'}) would return "Foo qux bar baz."
	--]]
	local msg = cfg[cfgKey]
	expectType = expectType or 'string'
	if type(msg) ~= expectType then
		error(require('Module:TNT').format('I18n/Documentation', 'cfg-error-msg-type', cfgKey, expectType, type(msg)), 2)
	end
	if not valArray then
		return msg
	end

	local function getMessageVal(match)
		match = tonumber(match)
		return valArray[match] or error(require('Module:TNT').format('I18n/Documentation', 'cfg-error-msg-empty', '$' .. match, cfgKey), 4)
	end

	local ret = ugsub(msg, '$([1-9][0-9]*)', getMessageVal)
	return ret
end

p.message = message

local function makeWikilink(page, display)
	if display then
		return mw.ustring.format('[[%s|%s]]', page, display)
	else
		return mw.ustring.format('[[%s]]', page)
	end
end

p.makeWikilink = makeWikilink

local function makeCategoryLink(cat, sort)
	local catns = mw.site.namespaces[14].name
	return makeWikilink(catns .. ':' .. cat, sort)
end

p.makeCategoryLink = makeCategoryLink

local function makeUrlLink(url, display)
	return mw.ustring.format('[%s %s]', url, display)
end

p.makeUrlLink = makeUrlLink

local function makeToolbar(...)
	local ret = {}
	local lim = select('#', ...)
	if lim < 1 then
		return nil
	end
	for i = 1, lim do
		ret[#ret + 1] = select(i, ...)
	end
	return '<small style="font-style: normal;">(' .. table.concat(ret, ' &#124; ') .. ')</small>'
end	

p.makeToolbar = makeToolbar

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

local function makeInvokeFunc(funcName)
	return function (frame)
		local args = getArgs(frame, {
			valueFunc = function (key, value)
				if type(value) == 'string' then
					value = value:match('^%s*(.-)%s*$') -- Remove whitespace.
					if key == 'heading' or value ~= '' then
						return value
					else
						return nil
					end
				else
					return value
				end
			end
		})
		return p[funcName](args)
	end
end

----------------------------------------------------------------------------
-- Load TemplateStyles
----------------------------------------------------------------------------

p.main = function(frame)
	local parent = frame.getParent(frame)
	local output = p._main(parent.args)
	return frame:extensionTag{ name='templatestyles', args = { src= message('templatestyles-scr') } } .. frame:preprocess(output)
end

----------------------------------------------------------------------------
-- Main function
----------------------------------------------------------------------------

function p._main(args)
	--[[
	-- This function defines logic flow for the module.
	-- @args - table of arguments passed by the user
	-- 
	-- Messages:
	-- 'main-div-id' --> 'template-documentation'
	-- 'main-div-classes' --> 'template-documentation iezoomfix'
	--]]
	local env = p.getEnvironment(args)
	local root = mw.html.create()
	root
		:wikitext(p.protectionTemplate(env))
		:wikitext(p.sandboxNotice(args, env))
		 -- This div tag is from {{documentation/start box}}, but moving it here
		 -- so that we don't have to worry about unclosed tags.
		:tag('div')
			:attr('id', message('main-div-id'))
			:addClass(message('main-div-class'))
			:wikitext(p._startBox(args, env))
			:wikitext(p._content(args, env))
			:done()
		:wikitext(p._endBox(args, env))
		:wikitext(p.addTrackingCategories(env))
	return tostring(root)
end

----------------------------------------------------------------------------
-- Environment settings
----------------------------------------------------------------------------

function p.getEnvironment(args)
	--[[
	-- Returns a table with information about the environment, including title objects and other namespace- or
	-- path-related data.
	-- @args - table of arguments passed by the user
	--
	-- Title objects include:
	-- env.title - the page we are making documentation for (usually the current title)
	-- env.templateTitle - the template (or module, file, etc.)
	-- env.docTitle - the /doc subpage.
	-- env.sandboxTitle - the /sandbox subpage.
	-- env.testcasesTitle - the /testcases subpage.
	-- env.printTitle - the print version of the template, located at the /Print subpage.
	--
	-- Data includes:
	-- env.protectionLevels - the protection levels table of the title object.
	-- env.subjectSpace - the number of the title's subject namespace.
	-- env.docSpace - the number of the namespace the title puts its documentation in.
	-- env.docpageBase - the text of the base page of the /doc, /sandbox and /testcases pages, with namespace.
	-- env.compareUrl - URL of the Special:ComparePages page comparing the sandbox with the template.
	-- 
	-- All table lookups are passed through pcall so that errors are caught. If an error occurs, the value
	-- returned will be nil.
	--]]
	
	local env, envFuncs = {}, {}

	-- Set up the metatable. If triggered we call the corresponding function in the envFuncs table. The value
	-- returned by that function is memoized in the env table so that we don't call any of the functions
	-- more than once. (Nils won't be memoized.)
	setmetatable(env, {
		__index = function (t, key)
			local envFunc = envFuncs[key]
			if envFunc then
				local success, val = pcall(envFunc)
				if success then
					env[key] = val -- Memoise the value.
					return val
				end
			end
			return nil
		end
	})	

	function envFuncs.title()
		-- The title object for the current page, or a test page passed with args.page.
		local title
		local titleArg = args.page
		if titleArg then
			title = mw.title.new(titleArg)
		else
			title = mw.title.getCurrentTitle()
		end
		return title
	end

	function envFuncs.templateTitle()
		--[[
		-- The template (or module, etc.) title object.
		-- Messages:
		-- 'sandbox-subpage' --> 'sandbox'
		-- 'testcases-subpage' --> 'testcases'
		--]]
		local subjectSpace = env.subjectSpace
		local title = env.title
		local subpage = title.subpageText
		if subpage == message('sandbox-subpage') or subpage == message('testcases-subpage') then
			return mw.title.makeTitle(subjectSpace, title.baseText)
		else
			return mw.title.makeTitle(subjectSpace, title.text)
		end
	end

	function envFuncs.docTitle()
		--[[
		-- Title object of the /doc subpage.
		-- Messages:
		-- 'doc-subpage' --> 'doc'
		--]]
		local title = env.title
		local docname = args[1] -- User-specified doc page.
		local docpage
		if docname then
			docpage = docname
		else
			docpage = env.docpageBase .. '/' .. message('doc-subpage')
		end
		return mw.title.new(docpage)
	end
	
	function envFuncs.sandboxTitle()
		--[[
		-- Title object for the /sandbox subpage.
		-- Messages:
		-- 'sandbox-subpage' --> 'sandbox'
		--]]
		return mw.title.new(env.docpageBase .. '/' .. message('sandbox-subpage'))
	end
	
	function envFuncs.testcasesTitle()
		--[[
		-- Title object for the /testcases subpage.
		-- Messages:
		-- 'testcases-subpage' --> 'testcases'
		--]]
		return mw.title.new(env.docpageBase .. '/' .. message('testcases-subpage'))
	end
	
	function envFuncs.printTitle()
		--[[
		-- Title object for the /Print subpage.
		-- Messages:
		-- 'print-subpage' --> 'Print'
		--]]
		return env.templateTitle:subPageTitle(message('print-subpage'))
	end

	function envFuncs.protectionLevels()
		-- The protection levels table of the title object.
		return env.title.protectionLevels
	end

	function envFuncs.subjectSpace()
		-- The subject namespace number.
		return mw.site.namespaces[env.title.namespace].subject.id
	end

	function envFuncs.docSpace()
		-- The documentation namespace number. For most namespaces this is the same as the
		-- subject namespace. However, pages in the Article, File, MediaWiki or Category
		-- namespaces must have their /doc, /sandbox and /testcases pages in talk space.
		local subjectSpace = env.subjectSpace
		if subjectSpace == 0 or subjectSpace == 6 or subjectSpace == 8 or subjectSpace == 14 then
			return subjectSpace + 1
		else
			return subjectSpace
		end
	end

	function envFuncs.docpageBase()
		-- The base page of the /doc, /sandbox, and /testcases subpages.
		-- For some namespaces this is the talk page, rather than the template page.
		local templateTitle = env.templateTitle
		local docSpace = env.docSpace
		local docSpaceText = mw.site.namespaces[docSpace].name
		-- Assemble the link. docSpace is never the main namespace, so we can hardcode the colon.
		return docSpaceText .. ':' .. templateTitle.text
	end
	
	function envFuncs.compareUrl()
		-- Diff link between the sandbox and the main template using [[Special:ComparePages]].
		local templateTitle = env.templateTitle
		local sandboxTitle = env.sandboxTitle
		if templateTitle.exists and sandboxTitle.exists then
			local compareUrl = mw.uri.fullUrl(
				'Special:ComparePages',
				{page1 = templateTitle.prefixedText, page2 = sandboxTitle.prefixedText}
			)
			return tostring(compareUrl)
		else
			return nil
		end
	end		

	return env
end	

----------------------------------------------------------------------------
-- Auxiliary templates
----------------------------------------------------------------------------

function p.sandboxNotice(args, env)
	--[=[
	-- Generates a sandbox notice for display above sandbox pages.
	-- @args - a table of arguments passed by the user
	-- @env - environment table containing title objects, etc., generated with p.getEnvironment
	-- 
	-- Messages:
	-- 'sandbox-notice-image' --> '[[Image:Sandbox.svg|50px|alt=|link=]]'
	-- 'sandbox-notice-blurb' --> 'This is the $1 for $2.'
	-- 'sandbox-notice-diff-blurb' --> 'This is the $1 for $2 ($3).'
	-- 'sandbox-notice-pagetype-template' --> '[[w:Wikipedia:Template test cases|template sandbox]] page'
	-- 'sandbox-notice-pagetype-module' --> '[[w:Wikipedia:Template test cases|module sandbox]] page'
	-- 'sandbox-notice-pagetype-other' --> 'sandbox page'
	-- 'sandbox-notice-compare-link-display' --> 'diff'
	-- 'sandbox-notice-testcases-blurb' --> 'See also the companion subpage for $1.'
	-- 'sandbox-notice-testcases-link-display' --> 'test cases'
	-- 'sandbox-category' --> 'Template sandboxes'
	--]=]
	local title = env.title
	local sandboxTitle = env.sandboxTitle
	local templateTitle = env.templateTitle
	local subjectSpace = env.subjectSpace
	if not (subjectSpace and title and sandboxTitle and templateTitle and mw.title.equals(title, sandboxTitle)) then
		return nil
	end
	-- Build the table of arguments to pass to {{ombox}}. We need just two fields, "image" and "text".
	local omargs = {}
	omargs.image = message('sandbox-notice-image')
	-- Get the text. We start with the opening blurb, which is something like
	-- "This is the template sandbox for [[Template:Foo]] (diff)."
	local text = ''
	local frame = mw.getCurrentFrame()
	local isPreviewing = frame:preprocess('{{REVISIONID}}') == '' -- True if the page is being previewed.
	local pagetype
	if subjectSpace == 10 then
		pagetype = message('sandbox-notice-pagetype-template')
	elseif subjectSpace == 828 then
		pagetype = message('sandbox-notice-pagetype-module')
	else
		pagetype = message('sandbox-notice-pagetype-other')
	end
	local templateLink = makeWikilink(templateTitle.prefixedText)
	local compareUrl = env.compareUrl
	if isPreviewing or not compareUrl then
		text = text .. message('sandbox-notice-blurb', {pagetype, templateLink})
	else
		local compareDisplay = message('sandbox-notice-compare-link-display')
		local compareLink = makeUrlLink(compareUrl, compareDisplay)
		text = text .. message('sandbox-notice-diff-blurb', {pagetype, templateLink, compareLink})
	end
	-- Get the test cases page blurb if the page exists. This is something like
	-- "See also the companion subpage for [[Template:Foo/testcases|test cases]]."
	local testcasesTitle = env.testcasesTitle
	if testcasesTitle and testcasesTitle.exists then
		if testcasesTitle.contentModel == "Scribunto" then
			local testcasesLinkDisplay = message('sandbox-notice-testcases-link-display')
			local testcasesRunLinkDisplay = message('sandbox-notice-testcases-run-link-display')
			local testcasesLink = makeWikilink(testcasesTitle.prefixedText, testcasesLinkDisplay)
			local testcasesRunLink = makeWikilink(testcasesTitle.talkPageTitle.prefixedText, testcasesRunLinkDisplay)
			text = text .. '<br />' .. message('sandbox-notice-testcases-run-blurb', {testcasesLink, testcasesRunLink})
		else
			local testcasesLinkDisplay = message('sandbox-notice-testcases-link-display')
			local testcasesLink = makeWikilink(testcasesTitle.prefixedText, testcasesLinkDisplay)
			text = text .. '<br />' .. message('sandbox-notice-testcases-blurb', {testcasesLink})
		end
	end
	-- Add the sandbox to the sandbox category.
	text = text .. makeCategoryLink(message('sandbox-category'))
	omargs.text = text
	omargs.class = message('sandbox-class')
	local ret = '<div style="clear: both;"></div>'
	ret = ret .. messageBox.main('ombox', omargs)
	return ret
end

function p.protectionTemplate(env)
	-- Generates the padlock icon in the top right.
	-- @env - environment table containing title objects, etc., generated with p.getEnvironment
	-- Messages:
	-- 'protection-template' --> 'pp-template'
	-- 'protection-template-args' --> {docusage = 'yes'}
	local title = env.title
	local protectionLevels
	local protectionTemplate = message('protection-template')
	local namespace = title.namespace
	if not (protectionTemplate and (namespace == 10 or namespace == 828)) then
		-- Don't display the protection template if we are not in the template or module namespaces.
		return nil
	end
	protectionLevels = env.protectionLevels
	if not protectionLevels then
		return nil
	end
	local editLevels = protectionLevels.edit
	local moveLevels = protectionLevels.move
	if moveLevels and moveLevels[1] == 'sysop' or editLevels and editLevels[1] then
		-- The page is full-move protected, or full, template, or semi-protected.
		local frame = mw.getCurrentFrame()
		return frame:expandTemplate{title = protectionTemplate, args = message('protection-template-args', nil, 'table')}
	else
		return nil
	end
end

----------------------------------------------------------------------------
-- Start box
----------------------------------------------------------------------------

p.startBox = makeInvokeFunc('_startBox')

function p._startBox(args, env)
	--[[
	-- This function generates the start box.
	-- @args - a table of arguments passed by the user
	-- @env - environment table containing title objects, etc., generated with p.getEnvironment
	-- 
	-- The actual work is done by p.makeStartBoxLinksData and p.renderStartBoxLinks which make
	-- the [view] [edit] [history] [purge] links, and by p.makeStartBoxData and p.renderStartBox
	-- which generate the box HTML.
	--]]
	env = env or p.getEnvironment(args)
	local links
	local content = args.content
	if not content then
		-- No need to include the links if the documentation is on the template page itself.
		local linksData = p.makeStartBoxLinksData(args, env)
		if linksData then
			links = p.renderStartBoxLinks(linksData)
		end
	end
	-- Generate the start box html.
	local data = p.makeStartBoxData(args, env, links)
	if data then
		return p.renderStartBox(data)
	else
		-- User specified no heading.
		return nil
	end
end

function p.makeStartBoxLinksData(args, env)
	--[[
	-- Does initial processing of data to make the [view] [edit] [history] [purge] links.
	-- @args - a table of arguments passed by the user
	-- @env - environment table containing title objects, etc., generated with p.getEnvironment
	-- 
	-- Messages:
	-- 'view-link-display' --> 'view'
	-- 'edit-link-display' --> 'edit'
	-- 'history-link-display' --> 'history'
	-- 'purge-link-display' --> 'purge'
	-- 'file-docpage-preload' --> 'Template:Documentation/preload-filespace'
	-- 'module-preload' --> 'Template:Documentation/preload-module-doc'
	-- 'docpage-preload' --> 'Template:Documentation/preload'
	-- 'create-link-display' --> 'create'
	--]]
	local subjectSpace = env.subjectSpace
	local title = env.title
	local docTitle = env.docTitle
	if not title or not docTitle then
		return nil
	end
	if docTitle.isRedirect then 
		docTitle = docTitle.redirectTarget
	end

	local data = {}
	data.title = title
	data.docTitle = docTitle
	-- View, display, edit, and purge links if /doc exists.
	data.viewLinkDisplay = i18n['view-link-display']
	data.editLinkDisplay = i18n['edit-link-display']
	data.historyLinkDisplay = i18n['history-link-display']
	data.purgeLinkDisplay = i18n['purge-link-display']
	-- Create link if /doc doesn't exist.
	local preload = args.preload
	if not preload then
		if subjectSpace == 6 then -- File namespace
			preload = message('file-docpage-preload')
		elseif subjectSpace == 828 then -- Module namespace
			preload = message('module-preload')
		else
			preload = message('docpage-preload')
		end
	end
	data.preload = preload
	data.createLinkDisplay = i18n['create-link-display']
	return data
end

function p.renderStartBoxLinks(data)
	--[[
	-- Generates the [view][edit][history][purge] or [create] links from the data table.
	-- @data - a table of data generated by p.makeStartBoxLinksData
	--]]
	
	local function escapeBrackets(s)
		-- Escapes square brackets with HTML entities.
		s = s:gsub('%[', '&#91;') -- Replace square brackets with HTML entities.
		s = s:gsub('%]', '&#93;')
		return s
	end

	local ret
	local docTitle = data.docTitle
	local title = data.title
	if docTitle.exists then
		local viewLink = makeWikilink(docTitle.prefixedText, data.viewLinkDisplay)
		local editLink = makeUrlLink(docTitle:fullUrl{action = 'edit'}, data.editLinkDisplay)
		local historyLink = makeUrlLink(docTitle:fullUrl{action = 'history'}, data.historyLinkDisplay)
		local purgeLink = makeUrlLink(title:fullUrl{action = 'purge'}, data.purgeLinkDisplay)
		ret = '[%s] [%s] [%s] [%s]'
		ret = escapeBrackets(ret)
		ret = mw.ustring.format(ret, viewLink, editLink, historyLink, purgeLink)
	else
		local createLink = makeUrlLink(docTitle:fullUrl{action = 'edit', preload = data.preload}, data.createLinkDisplay)
		ret = '[%s]'
		ret = escapeBrackets(ret)
		ret = mw.ustring.format(ret, createLink)
	end
	return ret
end

function p.makeStartBoxData(args, env, links)
	--[=[
	-- Does initial processing of data to pass to the start-box render function, p.renderStartBox.
	-- @args - a table of arguments passed by the user
	-- @env - environment table containing title objects, etc., generated with p.getEnvironment
	-- @links - a string containing the [view][edit][history][purge] links - could be nil if there's an error.
	--
	-- Messages:
	-- 'documentation-icon-wikitext' --> '[[File:Test Template Info-Icon - Version (2).svg|50px|link=|alt=Documentation icon]]'
	-- 'template-namespace-heading' --> 'Template documentation'
	-- 'module-namespace-heading' --> 'Module documentation'
	-- 'file-namespace-heading' --> 'Summary'
	-- 'other-namespaces-heading' --> 'Documentation'
	-- 'start-box-linkclasses' --> 'mw-editsection-like plainlinks'
	-- 'start-box-link-id' --> 'doc_editlinks'
	-- 'testcases-create-link-display' --> 'create'
	--]=]
	local subjectSpace = env.subjectSpace
	if not subjectSpace then
		-- Default to an "other namespaces" namespace, so that we get at least some output
		-- if an error occurs.
		subjectSpace = 2
	end
	local data = {}
	
	-- Heading
	local heading = args.heading -- Blank values are not removed.
	if heading == '' then
		-- Don't display the start box if the heading arg is defined but blank.
		return nil
	end
	if heading then
		data.heading = heading
	elseif subjectSpace == 10 then -- Template namespace
		data.heading = i18n['template-namespace-heading']
	elseif subjectSpace == 828 then -- Module namespace
		data.heading = i18n['module-namespace-heading']
	elseif subjectSpace == 6 then -- File namespace
		data.heading = i18n['file-namespace-heading']
	else
		data.heading = i18n['other-namespaces-heading']
	end
	
	-- Data for the [view][edit][history][purge] or [create] links.
	if links then
		data.linksClass = message('start-box-linkclasses')
		data.linksId = message('start-box-link-id')
		data.links = links
	end
	
	return data
end

function p.renderStartBox(data)
	-- Renders the start box html.
	-- @data - a table of data generated by p.makeStartBoxData.
	local sbox = mw.html.create('div')
	sbox
		:addClass(message('header-div-class'))
		:tag('div')
			:addClass(message('heading-div-class'))
			:wikitext(data.heading)
	local links = data.links
	if links then
		sbox
			:tag('div')
				:addClass(data.linksClass)
				:attr('id', data.linksId)
				:wikitext(links)
	end
	return tostring(sbox)
end

----------------------------------------------------------------------------
-- Documentation content
----------------------------------------------------------------------------

p.content = makeInvokeFunc('_content')

function p._content(args, env)
	-- Displays the documentation contents
	-- @args - a table of arguments passed by the user
	-- @env - environment table containing title objects, etc., generated with p.getEnvironment
	env = env or p.getEnvironment(args)
	local docTitle = env.docTitle
	local content = args.content
	if not content and docTitle and docTitle.exists then
		content = args._content or mw.getCurrentFrame():expandTemplate{title = docTitle.prefixedText}
	end
	-- The line breaks below are necessary so that "=== Headings ===" at the start and end
	-- of docs are interpreted correctly.
	local cbox = mw.html.create('div')
	cbox
		:addClass(message('content-div-class'))
		:wikitext('\n' .. (content or '') .. '\n')
	return tostring(cbox)
end

p.contentTitle = makeInvokeFunc('_contentTitle')

function p._contentTitle(args, env)
	env = env or p.getEnvironment(args)
	local docTitle = env.docTitle
	if not args.content and docTitle and docTitle.exists then
		return docTitle.prefixedText
	else
		return ''
	end
end

----------------------------------------------------------------------------
-- End box
----------------------------------------------------------------------------

p.endBox = makeInvokeFunc('_endBox')

function p._endBox(args, env)
	--[=[
	-- This function generates the end box (also known as the link box).
	-- @args - a table of arguments passed by the user
	-- @env - environment table containing title objects, etc., generated with p.getEnvironment
	--]=]
	
	-- Get environment data.
	env = env or p.getEnvironment(args)
	local subjectSpace = env.subjectSpace
	local docTitle = env.docTitle
	if not subjectSpace or not docTitle then
		return nil
	end
		
	-- Check whether we should output the end box at all. Add the end
	-- box by default if the documentation exists or if we are in the
	-- user, module or template namespaces.
	local linkBox = args['link box']
	if linkBox == 'off'
		or not (
			docTitle.exists
			or subjectSpace == 2
			or subjectSpace == 828
			or subjectSpace == 10
		)
	then
		return nil
	end

	-- Assemble the footer text field.
	local text = ''
	if linkBox then
		text = text .. linkBox
	else
		text = text .. (p.makeDocPageBlurb(args, env) or '') -- "This documentation is transcluded from [[Foo]]." 
		if subjectSpace == 2 or subjectSpace == 10 or subjectSpace == 828 then
			-- We are in the user, template or module namespaces.
			-- Add sandbox and testcases links.
			-- "Editors can experiment in this template's sandbox and testcases pages."
			text = text .. (p.makeExperimentBlurb(args, env) or '')
			text = text .. '<br />'
			if not args.content and not args[1] then
				-- "Please add categories to the /doc subpage."
				-- Don't show this message with inline docs or with an explicitly specified doc page,
				-- as then it is unclear where to add the categories.
				text = text .. (p.makeCategoriesBlurb(args, env) or '')
			end
			text = text .. ' ' .. (p.makeSubpagesBlurb(args, env) or '') --"Subpages of this template"
			local printBlurb = p.makePrintBlurb(args, env) -- Two-line blurb about print versions of templates.
			if printBlurb then
				text = text .. '<br />' .. printBlurb
			end
		end
	end

	local ebox = mw.html.create('div')
	ebox
		:addClass(message('footer-div-class'))
		:wikitext(text)
	return tostring(ebox)
end

function p.makeDocPageBlurb(args, env)
	--[=[
	-- Makes the blurb "This documentation is transcluded from [[Template:Foo]] (edit, history)".
	-- @args - a table of arguments passed by the user
	-- @env - environment table containing title objects, etc., generated with p.getEnvironment
	-- 
	-- Messages:
	-- 'edit-link-display' --> 'edit'
	-- 'history-link-display' --> 'history'
	-- 'transcluded-from-blurb' --> 
	-- 'The above [[Wikipedia:Template documentation|documentation]] 
	-- is [[Wikipedia:Transclusion|transcluded]] from $1.'
	-- 'module-preload' --> 'Template:Documentation/preload-module-doc'
	-- 'create-link-display' --> 'create'
	-- 'create-module-doc-blurb' -->
	-- 'You might want to $1 a documentation page for this [[Wikipedia:Lua|Scribunto module]].'
	--]=]
	local docTitle = env.docTitle
	if not docTitle then
		return nil
	end
	local ret
	if docTitle.exists then
		-- /doc exists; link to it.
		local docLink = makeWikilink(docTitle.prefixedText)
		local editUrl = docTitle:fullUrl{action = 'edit'}
		local editDisplay = i18n['edit-link-display']
		local editLink = makeUrlLink(editUrl, editDisplay)
		local historyUrl = docTitle:fullUrl{action = 'history'}
		local historyDisplay = i18n['history-link-display']
		local historyLink = makeUrlLink(historyUrl, historyDisplay)
		ret = message('transcluded-from-blurb', {docLink})
			.. ' '
			.. makeToolbar(editLink, historyLink)
			.. '<br />'
	elseif env.subjectSpace == 828 then
		-- /doc does not exist; ask to create it.
		local createUrl = docTitle:fullUrl{action = 'edit', preload = message('module-preload')}
		local createDisplay = i18n['create-link-display']
		local createLink = makeUrlLink(createUrl, createDisplay)
		ret = message('create-module-doc-blurb', {createLink})
			.. '<br />'
	end
	return ret
end

function p.makeExperimentBlurb(args, env)
	--[[
	-- Renders the text "Editors can experiment in this template's sandbox (edit | diff) and testcases (edit) pages."
	-- @args - a table of arguments passed by the user
	-- @env - environment table containing title objects, etc., generated with p.getEnvironment
	-- 
	-- Messages:
	-- 'sandbox-link-display' --> 'sandbox'
	-- 'sandbox-edit-link-display' --> 'edit'
	-- 'compare-link-display' --> 'diff'
	-- 'module-sandbox-preload' --> 'Template:Documentation/preload-module-sandbox'
	-- 'template-sandbox-preload' --> 'Template:Documentation/preload-sandbox'
	-- 'sandbox-create-link-display' --> 'create'
	-- 'mirror-edit-summary' --> 'Create sandbox version of $1'
	-- 'mirror-link-display' --> 'mirror'
	-- 'mirror-link-preload' --> 'Template:Documentation/mirror'
	-- 'sandbox-link-display' --> 'sandbox'
	-- 'testcases-link-display' --> 'testcases'
	-- 'testcases-edit-link-display'--> 'edit'
	-- 'template-sandbox-preload' --> 'Template:Documentation/preload-sandbox'
	-- 'testcases-create-link-display' --> 'create'
	-- 'testcases-link-display' --> 'testcases'
	-- 'testcases-edit-link-display' --> 'edit'
	-- 'module-testcases-preload' --> 'Template:Documentation/preload-module-testcases'
	-- 'template-testcases-preload' --> 'Template:Documentation/preload-testcases'
	-- 'experiment-blurb-module' --> 'Editors can experiment in this module's $1 and $2 pages.'
	-- 'experiment-blurb-template' --> 'Editors can experiment in this template's $1 and $2 pages.'
	--]]
	local subjectSpace = env.subjectSpace
	local templateTitle = env.templateTitle
	local sandboxTitle = env.sandboxTitle
	local testcasesTitle = env.testcasesTitle
	local templatePage = templateTitle.prefixedText
	if not subjectSpace or not templateTitle or not sandboxTitle or not testcasesTitle then
		return nil
	end
	-- Make links.
	local sandboxLinks, testcasesLinks
	if sandboxTitle.exists then
		local sandboxPage = sandboxTitle.prefixedText
		local sandboxDisplay = message('sandbox-link-display')
		local sandboxLink = makeWikilink(sandboxPage, sandboxDisplay)
		local sandboxEditUrl = sandboxTitle:fullUrl{action = 'edit'}
		local sandboxEditDisplay = message('sandbox-edit-link-display')
		local sandboxEditLink = makeUrlLink(sandboxEditUrl, sandboxEditDisplay)
		local compareUrl = env.compareUrl
		local compareLink
		if compareUrl then
			local compareDisplay = message('compare-link-display')
			compareLink = makeUrlLink(compareUrl, compareDisplay)
		end
		sandboxLinks = sandboxLink .. ' ' .. makeToolbar(sandboxEditLink, compareLink)
	else
		local sandboxPreload
		if subjectSpace == 828 then
			sandboxPreload = message('module-sandbox-preload')
		else
			sandboxPreload = message('template-sandbox-preload')
		end
		local sandboxCreateUrl = sandboxTitle:fullUrl{action = 'edit', preload = sandboxPreload}
		local sandboxCreateDisplay = message('sandbox-create-link-display')
		local sandboxCreateLink = makeUrlLink(sandboxCreateUrl, sandboxCreateDisplay)
		local mirrorSummary = message('mirror-edit-summary', {makeWikilink(templatePage)})
		local mirrorPreload = message('mirror-link-preload')
		local mirrorUrl = sandboxTitle:fullUrl{action = 'edit', preload = mirrorPreload, summary = mirrorSummary}
		local mirrorDisplay = message('mirror-link-display')
		local mirrorLink = makeUrlLink(mirrorUrl, mirrorDisplay)
		sandboxLinks = message('sandbox-link-display') .. ' ' .. makeToolbar(sandboxCreateLink, mirrorLink)
	end
	if testcasesTitle.exists then
		local testcasesPage = testcasesTitle.prefixedText
		local testcasesDisplay = message('testcases-link-display')
		local testcasesLink = makeWikilink(testcasesPage, testcasesDisplay)
		local testcasesEditUrl = testcasesTitle:fullUrl{action = 'edit'}
		local testcasesEditDisplay = message('testcases-edit-link-display')
		local testcasesEditLink = makeUrlLink(testcasesEditUrl, testcasesEditDisplay)
		testcasesLinks = testcasesLink .. ' ' .. makeToolbar(testcasesEditLink)
	else
		local testcasesPreload
		if subjectSpace == 828 then
			testcasesPreload = message('module-testcases-preload')
		else
			testcasesPreload = message('template-testcases-preload')
		end
		local testcasesCreateUrl = testcasesTitle:fullUrl{action = 'edit', preload = testcasesPreload}
		local testcasesCreateDisplay = message('testcases-create-link-display')
		local testcasesCreateLink = makeUrlLink(testcasesCreateUrl, testcasesCreateDisplay)
		testcasesLinks = message('testcases-link-display') .. ' ' .. makeToolbar(testcasesCreateLink)
	end
	local messageName
	if subjectSpace == 828 then
		messageName = 'experiment-blurb-module'
	else
		messageName = 'experiment-blurb-template'
	end
	return message(messageName, {sandboxLinks, testcasesLinks})
end

function p.makeCategoriesBlurb(args, env)
	--[[
	-- Generates the text "Please add categories to the /doc subpage."
	-- @args - a table of arguments passed by the user
	-- @env - environment table containing title objects, etc., generated with p.getEnvironment
	-- Messages:
	-- 'doc-link-display' --> '/doc'
	-- 'add-categories-blurb' --> 'Please add categories to the $1 subpage.'
	--]]
	local docTitle = env.docTitle
	if not docTitle then
		return nil
	end
	local docPathLink = makeWikilink(docTitle.prefixedText, message('doc-link-display'))
	return message('add-categories-blurb', {docPathLink})
end

function p.makeSubpagesBlurb(args, env)
	--[[
	-- Generates the "Subpages of this template" link.
	-- @args - a table of arguments passed by the user
	-- @env - environment table containing title objects, etc., generated with p.getEnvironment
	
	-- Messages:
	-- 'template-pagetype' --> 'template'
	-- 'module-pagetype' --> 'module'
	-- 'default-pagetype' --> 'page'
	-- 'subpages-link-display' --> 'Subpages of this $1'
	--]]
	local subjectSpace = env.subjectSpace
	local templateTitle = env.templateTitle
	if not subjectSpace or not templateTitle then
		return nil
	end
	local pagetype
	if subjectSpace == 10 then
		pagetype = message('template-pagetype')
	elseif subjectSpace == 828 then
		pagetype = message('module-pagetype')
	else
		pagetype = message('default-pagetype')
	end
	local subpagesLink = makeWikilink(
		'Special:PrefixIndex/' .. templateTitle.prefixedText .. '/',
		message('subpages-link-display', {pagetype})
	)
	return message('subpages-blurb', {subpagesLink})
end

function p.makePrintBlurb(args, env)
	--[=[
	-- Generates the blurb displayed when there is a print version of the template available.
	-- @args - a table of arguments passed by the user
	-- @env - environment table containing title objects, etc., generated with p.getEnvironment
	--
	-- Messages:
	-- 'print-link-display' --> '/Print'
	-- 'print-blurb' --> 'A [[Help:Books/for experts#Improving the book layout|print version]]'
	--		.. ' of this template exists at $1.'
	--		.. ' If you make a change to this template, please update the print version as well.'
	-- 'display-print-category' --> true
	-- 'print-category' --> 'Templates with print versions'
	--]=]
	local printTitle = env.printTitle
	if not printTitle then
		return nil
	end
	local ret
	if printTitle.exists then
		local printLink = makeWikilink(printTitle.prefixedText, message('print-link-display'))
		ret = message('print-blurb', {printLink})
		local displayPrintCategory = message('display-print-category', nil, 'boolean')
		if displayPrintCategory then
			ret = ret .. makeCategoryLink(message('print-category'))
		end
	end
	return ret
end

----------------------------------------------------------------------------
-- Tracking categories
----------------------------------------------------------------------------

function p.addTrackingCategories(env)
	--[[
	-- Check if {{documentation}} is transcluded on a /doc or /testcases page.
	-- @env - environment table containing title objects, etc., generated with p.getEnvironment
	
	-- Messages:
	-- 'display-strange-usage-category' --> true
	-- 'doc-subpage' --> 'doc'
	-- 'testcases-subpage' --> 'testcases'
	-- 'strange-usage-category' --> 'Wikipedia pages with strange ((documentation)) usage'
	-- 
	-- /testcases pages in the module namespace are not categorised, as they may have
	-- {{documentation}} transcluded automatically.
	--]]
	local title = env.title
	local subjectSpace = env.subjectSpace
	if not title or not subjectSpace then
		return nil
	end
	local subpage = title.subpageText
	local ret = ''
	if message('display-strange-usage-category', nil, 'boolean')
		and (
			subpage == message('doc-subpage')
			or subjectSpace ~= 828 and subpage == message('testcases-subpage')
		)
	then
		ret = ret .. makeCategoryLink(message('strange-usage-category'))
	end
	return ret
end

return p
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