Module:Excerpt slideshow

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This module is subject to page protection. It is a highly visible module in use by a very large number of pages, or is substituted very frequently. Because vandalism or mistakes would affect many pages, and even trivial editing might cause substantial load on the servers, it is protected from editing.

This module depends on the following other modules:

This module allows article excerpt (from Module:Excerpt) to be put into a slideshow (using Module:Random slideshow). It is intended to be used in portals.

The following templates use this module:

Tracking categories

The following categories track use where the "Selected general articles" list is built solely from templates:

Category:Automated portals with article list built solely from one template (population: 0)
Category:Automated portals with article list built solely from two templates (population: 0)
Category:Automated portals with article list built solely from three templates (population: 0)
Usages with more than three templates are not currently tracked

Pages where the "Selected general articles" list is built from a list embeded in the portal:

Category:Automated portals with embedded list (population: 0)

Purge this page to update the totals.

Note that the Category:Automated portals with embedded list was enabled on 19 April 2019, and it will probably take a few days for all the portal pages to update

Testcases

The following testcase pages are available for testing changes made to this module's sandbox:

local p = {}
local excerptModule = require('Module:Excerpt/portals')
local slideshowModule = require('Module:Random slideshow')
local randomModule = require('Module:Random')

local DEFAULT_LIMIT = 25 -- max number of excerpts to be shown in the slideshow
local SOURCE_PAGES_LIMIT = 10 -- max number of pages to check for links / list items

-- begin BHG addition for tracking source pages
local sourcepgagesused = {};
local sourcepgagesusedcounter = 0;
local articlelistcount = -1;
local usesEmbeddedList = false;
-- end BHG addition for tracking source pages

function cleanupArgs(argsTable)
	local cleanArgs = {}
	for key, val in pairs(argsTable) do
		if type(val) == 'string' then
			val = val:match('^%s*(.-)%s*$')
			if val ~= '' then
				cleanArgs[key] = val
			end
		else
			cleanArgs[key] = val
		end
	end
	return cleanArgs
end

function isDeclined(val)
	if not val then return false end
	local declinedWords = " decline declined exclude excluded false none not no n off omit omitted remove removed "
	return string.find(declinedWords , ' '..val..' ', 1, true ) and true or false
end

--[[
	@param {String} wikitext: Wikitext of just the list (i.e. each line is a list item)
	@param {String} symbol:   Special character used in the wikitext markup for the list, e.g. '*' or '#'
	@param {String} outerTag: Text portion of the tag for each list or sublist, e.g. 'ul' or 'ol'
	@param {String} innerTag: Text portion of the tag for each list item, e.g. 'li'
]]
local wikitextToHtmlList = function(wikitext, symbol, outerTag, innerTag)
	local listParts = {}
	for level, item in mw.ustring.gmatch('\n'..wikitext..'\n', '\n(%'..symbol..'+)(.-)%f[\n]') do
	    table.insert(listParts, {level=level, item=item})
	end
	table.insert(listParts, {level='', item=''})
	
	local htmlList = {}
	for i, this in ipairs( listParts ) do
		local isFirstItem = (i == 1)
		local isLastItem = (i == #listParts)
	    local lastLevel = isFirstItem and '' or listParts[i-1]['level']
	    local tags
	    if #lastLevel == #this.level then
	    	tags = '</'..innerTag..'><'..innerTag..'>'
	    elseif #this.level > #lastLevel then
	    	tags = string.rep('<'..outerTag..'><'..innerTag..'>', #this.level - #lastLevel)
	    elseif isLastItem then
	    	tags = string.rep('</'..innerTag..'></'..outerTag..'>', #lastLevel)
	    else -- ( #this.level < #lastLevel ) and not last item
	    	tags = string.rep('</'..innerTag..'></'..outerTag..'>', #lastLevel - #this.level ) .. '</'..innerTag..'><'..innerTag..'>'
	    end
	    table.insert(htmlList, tags .. this.item)
	end
	return table.concat(htmlList)
end

--[[
	@param {String} wikitext: Wikitext excertp containg zero or more lists
	@param {String} symbol:   Special character used in the wikitext markup for the list, e.g. '*' or '#'
	@param {String} outerTag: Text portion of the tag for each list or sublist, e.g. 'ul' or 'ol'
	@param {String} innerTag: Text portion of the tag for each list item, e.g. 'li'
]]
local gsubWikitextLists = function(wikitext, symbol, outerTag, innerTag)
	-- temporarily remove list linebreaks... 
	wikitext = mw.ustring.gsub(wikitext..'\n', '\n%'..symbol, '¿¿¿'..symbol) 
	-- ...so we can grab the whole list (and just the list)...
	return mw.ustring.gsub(
		wikitext,
		'¿¿¿%'..symbol..'[^\n]+', 
		function(listWikitext)
			-- ...and then reinstate linebreaks...
			listWikitext = mw.ustring.gsub(listWikitext, '¿¿¿%'..symbol, '\n'..symbol)
			-- ...and finally do the conversion
			return wikitextToHtmlList(listWikitext, symbol, outerTag, innerTag)
		end
	)
end

--[[ help gsub strip tables and templates that aren't part of the prose,
     and remove linebreaks from within other templates,
     and preprocess parser functions ]]
local processBraces = function(t)
	local isTable = mw.ustring.sub(mw.text.trim(t), 2, 2) == '|'
	if isTable then
		return ''
	end
	-- else it's a template or parser function
	local first = mw.ustring.sub(t, 1, 1)
	local last = mw.ustring.sub(t, -1)
	local isNotPartOfProse = first == '\n' and last == '\n'
	if isNotPartOfProse then
		return ''
	end
	local isParserFunction = mw.ustring.sub(mw.text.trim(t), 3, 3) == '#'
	if isParserFunction then
		local frame = mw.getCurrentFrame()
		return frame:preprocess(t)
	end
	-- else remove internal linebreaks
	return mw.ustring.gsub(t, '\n*', '')
end

local cleanUpExcerpt = function(excerpt)
	-- strip galleries
	excerpt = mw.ustring.gsub(excerpt, "<%s*[Gg]allery.->.-<%s*/%s*[Gg]allery%s*>", "")
	-- strip tables and block templates; strip newlines
	excerpt = mw.ustring.gsub(excerpt..'\n', '\n?%b{}\n?', processBraces)
	-- replace wikitext bulleted lists with html bulleted lists
	excerpt = gsubWikitextLists(excerpt, '*', 'ul', 'li')
	-- replace wikitext numbered lists with html numbered lists
	excerpt = gsubWikitextLists(excerpt, '#', 'ol', 'li')
	excerpt = mw.text.trim(excerpt)
	return excerpt
end

function makeGalleryArgs(titles, options, limit, nonRandom)
	local galleryArgs = {}
	local titlesSequence = {}
	local i = 1
	while titles[i] do
		titlesSequence[i] = titles[i]
		i  = i + 1
	end
	local sortedTitles = nonRandom and titlesSequence or randomModule.main('array', {t=titlesSequence, limit=limit})
	for _i, title in ipairs(sortedTitles) do
		if (#galleryArgs / 2) < limit then
			local success, excerpt = pcall(excerptModule.get, title, options)
			if not success then
				mw.log("require('Module:Excerpt').get failed: " .. excerpt) -- probably got a redlink
				excerpt = nil
			end
			if excerpt and excerpt ~= '' and #excerpt > 10 then -- check again in case we had a few characters plus (Full article...)
				excerpt = cleanUpExcerpt(excerpt)
				if options.more then
					excerpt = excerpt .. " ('''[[" .. title .. "|" .. options.more .. "]]''')"
				end
				local text = '<div style="text-align:left;">' .. mw.ustring.gsub(excerpt, '%c', '<br>') .. '</div>'
				table.insert(galleryArgs, 'File:Blank.png')
				table.insert(galleryArgs, text)
			end
		end
	end
	if nonRandom then
		galleryArgs.random = 'false'
	end
	if #galleryArgs == 0 and options.nostubs then
		-- try again, this time including stubs
		options.nostubs = false
		return makeGalleryArgs(titles, options, limit, nonRandom)
	else
		return galleryArgs
	end
end

local makeOptions = function(args)
	local options = args -- pick up miscellaneous options: more, errors, fileargs
	options.paraflags = excerptModule.numberFlags(args.paragraphs or "") -- parse paragraphs, e.g. "1,3-5" → {"1","3-5"}
	options.fileflags = excerptModule.numberFlags(args.files or "") -- parse file numbers
	options.ignoreOnlyincludes = options.ignoreOnlyincludes == nil and true or options.ignoreOnlyincludes -- default to true
	if args.nostubs and isDeclined(args.nostubs) then
		options.nostubs = false
	else 
		options.nostubs = true
	end
	return options
end

local isArticle = function(pagetitle)
	local titleObject = mw.title.new(pagetitle)
	return ( titleObject and titleObject.namespace == 0 ) and true or false
end

local getLinkedTitles = function(args, method, limit)
	local pagenames = {}
	local ii = 1
	local isNotCategory
	while args[ii] and ii < limit do
		local pageContent = excerptModule.getContent(args[ii])
		if pageContent then
			local pageSection = args["section"..ii] or args["section"]
			local sectionOnly = args["sectiononly"..ii] or args["sectiononly"]
			local text = pageContent
			if pageSection then -- check relevant section only
				local success, result = pcall(excerptModule.getSection, pageContent, pageSection, sectionOnly)
				if not success then
					mw.log("require('Module:Excerpt').getSection failed on the content of " .. args[ii] .. ": " .. result)
					result = nil
				end
				text = result or pageContent
			end
			-- begin BHG addition for tracking source pages
			local thisPage = mw.title.getCurrentTitle().nsText .. ":" .. mw.title.getCurrentTitle().text
			thisPage = thisPage:gsub('_', ' ') -- fix the nsText part, until [[phab:T369784]] is resolved
			local thisBareParam = mw.ustring.gsub(args[ii], "^([^#]+).*$", "%1", 1) -- strip any section anchor from the parameter's page name
			thisBareParam = thisBareParam:gsub('_', ' ') -- support underscores in parameter's page name
			if (thisPage == thisBareParam) then
				usesEmbeddedList = true;
			end
			-- end BHG addition for tracking source pages
			-- replace annotated links with real links
			text = mw.ustring.gsub(text, "{{%s*[Aa]nnotated[ _]link%s*|%s*(.-)%s*}}", "[[%1]]")
			if method == "linked" then
				for p in mw.ustring.gmatch(text, "%[%[%s*([^%]|\n]*)") do
					if isArticle(p) then
						table.insert(pagenames, p)
					end
				end
			else
				-- listitem: first wikilink on a line beginning *, :#, etc. except in "See also" or later section
				text = mw.ustring.gsub(text, "\n== *See also.*", "")
				for p in mw.ustring.gmatch(text, "\n:*[%*#][^\n]-%[%[%s*([^%]|\n]*)") do
					if isArticle(p) then
						table.insert(pagenames, p)
					end
				end
			end
			-- begin BHG addition for tracking source pages
			if ((method == "listitem") or (method == "linked")) then
				table.insert(sourcepgagesused, args[ii])
				sourcepgagesusedcounter = sourcepgagesusedcounter + 1
			end
			-- end BHG addition for tracking source pages
		end
		ii = ii + 1
	end
	-- begin BHG addition for tracking
	articlelistcount = #pagenames
	-- end BHG addition for tracking
	return pagenames
end

-- Template entry points:

-- randomExcerpt: Titles specified in template parameters (equivalent to {{Transclude random excerpt}})
p.randomExcerpt = function(frame)
	local parent = frame.getParent(frame)
	local output = p._excerpt(parent.args, 'random')
	return frame:extensionTag{ name='templatestyles', args = { src='Module:Random slideshow/styles.css'} } 
		.. frame:preprocess(output)
end

-- linkedExcerpt: Titles from links on one or more pages (similar to {{Transclude linked excerpt}})
p.linkedExcerpt = function(frame)
	local parent = frame.getParent(frame)
	local output = p._excerpt(parent.args, 'linked')
	return frame:extensionTag{ name='templatestyles', args = { src='Module:Random slideshow/styles.css'} } 
		.. frame:preprocess(output)
end

-- listItemExcerpt: Titles from linked list items one one or more pages (similar to {{Transclude list item excerpt}})
p.listItemExcerpt = function(frame)
	local parent = frame.getParent(frame)
	local output = p._excerpt(parent.args, 'listitem')
	return frame:extensionTag{ name='templatestyles', args = { src='Module:Random slideshow/styles.css'} } 
		.. frame:preprocess(output)
end


-- Module entry point:

p._excerpt = function(_args, method)
	local args = cleanupArgs(_args)
	args.more = excerptModule.getMoreLinkText(_args.more)
	local options = makeOptions(args)
	local limit = args.limit and tonumber(args.limit) or DEFAULT_LIMIT
	local titles
	if method == 'linked' or method == 'listitem' then
		titles = getLinkedTitles(args, method, SOURCE_PAGES_LIMIT)
	else
		titles = args
	end
	local galleryArgs = makeGalleryArgs(titles, options, limit, isDeclined(_args.random))
	return slideshowModule._main(galleryArgs, false, 'excerptSlideshow-container') .. checksourcepages()
end

p._cleanUpExcerpt = cleanUpExcerpt

-- begin BHG addition for tracking source pages
function checksourcepages()
	-- no tracking unless we are in Portal namespace
	if (mw.title.getCurrentTitle().nsText ~= "Portal") then
		return ""
	end
	local pagecounter = 0;
	local templatecount = 0;
	local outlinecount = 0;
	local retval ="";
	local usesEponymousArticle = false;
	local debugging = false;
	local thisPageBareName = mw.title.getCurrentTitle().text;
	if debugging then
		retval = '<div style="display:block; border:10px solid green; background-color:#efe; padding:1em; margin:1em">\n----\n'
		retval = retval .. "sourcepgagesusedcounter: " .. sourcepgagesusedcounter .. "\n----\n"
		retval = retval .. "pages used:"
	end
	local apage
	for apage in arrayvalues(sourcepgagesused) do
		if debugging then 
			retval = retval .. "\n# [[:" .. apage .. "]]"
			retval = retval .. " — " .. "First 999 = /" .. string.sub(apage, 1, 999) .. "/"
		end
		if (string.find(apage, "^[tT]emplate ?:") == 1) then
			templatecount = templatecount + 1;
		end
		if (string.find(apage, "^[oO]utline +of ") == 1) then
			outlinecount = outlinecount + 1;
		end
		if (apage == thisPageBareName) then
			usesEponymousArticle = true;
		end
		pagecounter = pagecounter + 1
	end
	if debugging then
		retval = retval .. "\nTotal pages: " .. pagecounter
		retval = retval .. "\ntemplatecount: " .. templatecount
		retval = retval .. "</div>"
	end
	-- first do a sanity check that both counting methods have produced the same result
	if (sourcepgagesusedcounter == pagecounter) then
		-- if all pages are templates, then populate tracking categories
		if (pagecounter == templatecount) then
			if (templatecount == 1) then
				retval = retval .. "[[Category:Automated article-slideshow portals with article list built solely from one template]]"
			elseif (templatecount == 2) then
				retval = retval .. "[[Category:Automated article-slideshow portals with article list built solely from two templates]]"
			elseif (templatecount == 3) then
				retval = retval .. "[[Category:Automated article-slideshow portals with article list built solely from three templates]]"
			elseif (templatecount > 3) then
				retval = retval .. "[[Category:Automated article-slideshow portals with article list built solely from four or more templates]]"
			end
		elseif (templatecount > 0) then
			retval = retval .. "[[Category:Automated article-slideshow portals with article list built using one or more templates, and other sources]]"
		end
	end
	if (outlinecount >= 1) then
		retval = retval .. "[[Category:Automated article-slideshow portals with article list built using one or more outline pages]]"
	end
	if (articlelistcount < 2) then
		retval = retval .. "[[Category:Automated article-slideshow portals with less than 2 articles in article list]]"
	elseif (articlelistcount <= 5) then
		retval = retval .. "[[Category:Automated article-slideshow portals with 2–5 articles in article list]]"
	elseif (articlelistcount <= 10) then
		retval = retval .. "[[Category:Automated article-slideshow portals with 6–10 articles in article list]]"
	elseif (articlelistcount <= 15) then
		retval = retval .. "[[Category:Automated article-slideshow portals with 11–15 articles in article list]]"
	elseif (articlelistcount <= 20) then
		retval = retval .. "[[Category:Automated article-slideshow portals with 16–20 articles in article list]]"
	elseif (articlelistcount <= 25) then
		retval = retval .. "[[Category:Automated article-slideshow portals with 21–25 articles in article list]]"
	elseif (articlelistcount <= 30) then
		retval = retval .. "[[Category:Automated article-slideshow portals with 26–30 articles in article list]]"
	elseif (articlelistcount <= 40) then
		retval = retval .. "[[Category:Automated article-slideshow portals with 31–40 articles in article list]]"
	elseif (articlelistcount <= 50) then
		retval = retval .. "[[Category:Automated article-slideshow portals with 41–50 articles in article list]]"
	elseif (articlelistcount <= 100) then
		retval = retval .. "[[Category:Automated article-slideshow portals with 51–100 articles in article list]]"
	elseif (articlelistcount <= 200) then
		retval = retval .. "[[Category:Automated article-slideshow portals with 101–200 articles in article list]]"
	elseif (articlelistcount <= 500) then
		retval = retval .. "[[Category:Automated article-slideshow portals with 201–500 articles in article list]]"
	elseif (articlelistcount <= 1000) then
		retval = retval .. "[[Category:Automated article-slideshow portals with 501–1000 articles in article list]]"
	elseif (articlelistcount > 1000) then
		retval = retval .. "[[Category:Automated article-slideshow portals with over 1000 articles in article list]]"
	end
	if usesEmbeddedList then
		retval = retval .. "[[Category:Automated article-slideshow portals with embedded list]]"	
	end
	if usesEponymousArticle then
		retval = retval .. "[[Category:Automated article-slideshow portals with article list built using eponymous article]]"
	end
	return retval
end

function arrayvalues(t)
	local i = 0
	return function() i = i + 1; return t[i] end
end

-- end BHG addition for tracking source pages
return p

v t e Portal templates
Visual overview of template usage
Layout and formatting	{{Box portal skeleton}} {{Box-header}} color palettes plain round square watch {{Box-header colour}}^[1] {{Box-footer}} {{Flex columns}} {{Plain navboxes}}
Content transclusion	{{Transclude lead excerpt}}^[2] {{Transclude linked excerpt}}^[2] {{Transclude list item excerpt}}^[2] {{Transclude random excerpt}}^[2] {{Transclude selected excerpt}}^[2] {{Excerpt}} {{Transclude DYK}}^[9] {{Transclude selected current events}}^[3] {{Transclude selected recent additions}}^[4]
Content slideshows	{{Random slideshow}}^[5] {{Transclude files as random slideshow}}^[5] {{Transclude excerpts as random slideshow}}^[6] {{Transclude linked excerpts as random slideshow}}^[6] {{Transclude list item excerpts as random slideshow}}^[6]
Content randomisation	{{Random portal component}}^[7] {{Random quotation}} {{Random subpage}}
General	{{Portals}} {{Portals browsebar}} {{Portal description}} {{Portal information sidebar}} {{Portal navbar no header2}} {{Purge link portals}} {{Wikimedia for portals}}
Linking templates	{{Portal}}^[11] {{Portal bar}}^[12] {{Portal-inline}}^[13] {{Pbox}} {{Related portals2}}
Talk pages / Maintenance	{{Portal talk}} {{Portal maintenance status}}^[8] {{Portal suggestions}} {{Portal toolbox}} {{WikiProject Portals}}^[8]
Images	{{Portal dynamic image}} {{Portal image banner}}^[10] {{Portal pictures}}^[14] {{Portal POTD}}
Modules	1. Module:Box-header 2. Module:Excerpt/portals 3. Module:Selected current events 4. Module:Selected recent additions 5. Module:Random slideshow 6. Module:Excerpt slideshow 7. Module:Random portal component 8. Module:Portal maintenance status 9. Module:Transclude DYK 10. Module:Portal image banner 11. Module:Portal 12. Module:Portal bar 13. Module:Portal-inline 14. Module:Portal pictures
Usage	Wikipedia:Portal Wikipedia:WikiProject Portals
For more information, see: Category:Template-Class Portal pages and Category:Wikipedia Portal templates