Module:Automatic archive navigator

--- --                      Automatic archive navigator -- -- This module produces a talk archive banner, together with an automatically- -- generated list of navigation links to other archives of the talk page in -- question. It implements and -- . ---

local yesno = require('Module:Yesno')

--- -- Helper functions ---

local function makeWikilink(page, display) if display then return string.format('%s', page, display) else return string.format('%s', page) end end

local function escapePattern(s) -- Escape punctuation in a string so it can be used in a Lua pattern. s = s:gsub('%p', '%%%0') return s end

--- -- Navigator class ---

local Navigator = {} Navigator.__index = Navigator

function Navigator.new(args, cfg, currentTitle) local obj = setmetatable({}, Navigator) -- Set inputs obj.args = args obj.cfg = cfg obj.currentTitle = currentTitle

-- Archive prefix -- Decode HTML entities so users can enter things like "Archive&#32;" from -- wikitext. obj.archivePrefix = obj.args.prefix or obj:message('archive-prefix') obj.archivePrefix = mw.text.decode(obj.archivePrefix)

-- Current archive number do local pattern = string.format(			'^%s([1-9][0-9]*)$',			escapePattern(obj.archivePrefix)		) obj.currentArchiveNum = obj.currentTitle.subpageText:match(pattern) obj.currentArchiveNum = tonumber(obj.currentArchiveNum) end -- Highest archive number obj.highestArchiveNum = require('Module:Highest archive number')._main(		 obj.currentTitle.nsText ..		 	':' .. 			obj.currentTitle.baseText .. 			'/' .. 			obj.archivePrefix	)

return obj end

function Navigator:message(key, ...) local msg = self.cfg[key] if select('#', ...) > 0 then return mw.message.newRawMessage(msg, ...):plain else return msg end end

function Navigator:makeBlurb local args = self.args if args[1] == '1' then -- The old template used "|1" to suppress the blurb. return '' else local ret if args.text then ret = args.text else local talkPage = self.currentTitle.nsText .. ':' ..				self.currentTitle.baseText if args.period then ret = self:message('blurb-period', talkPage, args.period) else ret = self:message('blurb-noperiod', talkPage) end end return ret end end

function Navigator:makeMessageBox local args = self.args local image if args.image then image = args.image else local icon = args.icon or self:message('default-icon') image = string.format(			'',			icon,			self:message('image-size')		) end

local mbox = require('Module:Message box').main('tmbox', {		image = image,		imageright = args.imageright,		style = args.style or 'width:80%;margin-left:auto;margin-right:auto',		textstyle = args.textstyle or 'text-align:center',		text = self:makeBlurb	})

return mbox end

function Navigator:getArchiveNums -- Returns an array of the archive numbers to format. local noLinks = tonumber(self.args.links) or self:message('default-link-count') noLinks = math.floor(noLinks) -- If |noredlinks is "yes", true or absent, don't allow red links. If it is -- 'no' or false, allow red links. local allowRedLinks = yesno(self.args.noredlinks) == false local current = self.currentArchiveNum local highest = self.highestArchiveNum

if not current or not highest or noLinks < 1 then return {} elseif noLinks == 1 then return {current} end

local function getNum(i, current) -- Gets an archive number given i, the position in the array away from -- the current archive, and the current archive number. The first two -- offsets are consecutive; the third offset is rounded up to the -- nearest 5; and the fourth and subsequent offsets are rounded up to -- the nearest 10. The offsets are calculated in such a way that archive -- numbers will not be duplicated. if -2 <= i and i <= 2 then return current + i		elseif -3 <= i and i <= 3 then return current + 2 - (current + 2) % 5 + (i / 3) * 5 elseif 4 <= i then return current + 7 - (current + 7) % 10 + (i - 3) * 10 else return current + 2 - (current + 2) % 10 + (i + 3) * 10 end end

local nums = {}

-- Archive nums lower than the current page. for i = -1, -math.floor((noLinks - 1) / 2), -1 do		local num = getNum(i, current) if num <= 1 then table.insert(nums, 1, 1) break else table.insert(nums, 1, num) end end

-- Current page. if nums[#nums] < current then table.insert(nums, current) end

-- Higher archive nums. for i = 1, math.ceil((noLinks - 1) / 2) do		local num = getNum(i, current) if num <= highest then table.insert(nums, num) elseif allowRedLinks and (i <= 2 or i <= 3 and num == nums[#nums] + 1) then -- Only insert one red link, and only if it is consecutive. table.insert(nums, highest + 1) break elseif nums[#nums] < highest then -- Insert the highest archive number if it isn't already there. table.insert(nums, highest) break else break end end

return nums end

function Navigator:makeArchiveLinksWikitable local lang = mw.language.getContentLanguage local nums = self:getArchiveNums local noLinks = #nums if noLinks < 1 then return '' end

-- Make the table of links. local links = {} local isCompact = noLinks > 7 local currentIndex for i, num in ipairs(nums) do local subpage = self.archivePrefix .. tostring(num) local display if isCompact then display = tostring(num) else display = self:message('archive-link-display', num) end local link = makeWikilink('../' .. subpage, display) if num == self.currentArchiveNum then link = string.format(' %s ', link) currentIndex = i		end table.insert(links, link) end

-- Add the arrows. -- We must do the forwards arrow first as we are adding elements to the -- links table. If we did the backwards arrow first the index for the -- current archive would be wrong. currentIndex = currentIndex or math.ceil(#links / 2) for i = currentIndex + 1, #links do		if nums[i] - nums[i - 1] > 1 then table.insert(links, i, lang:getArrow('forwards')) break end end for i = currentIndex - 1, 1, -1 do		if nums[i + 1] - nums[i] > 1 then table.insert(links, i + 1, lang:getArrow('backwards')) break end end

-- Output the wikitable. local ret = {} local width if noLinks <= 3 then width = string.format('%dem', noLinks * 10) elseif noLinks <= 7 then width = string.format('%dem', (noLinks + 3) * 5) else width = '50em' end ret[#ret + 1] = string.format(		'{| style="width:%s;background:transparent;' ..			'margin:0 auto 0.5em;text-align:center"',		width	) for i, s in ipairs(links) do		if i % 20 == 1 then ret[#ret + 1] = '\n|-' end ret[#ret + 1] = '\n| ' ret[#ret + 1] = s	end ret[#ret + 1] = '\n|}' return table.concat(ret) end

function Navigator:__tostring return self:makeMessageBox .. '\n' .. self:makeArchiveLinksWikitable .. ' __NONEWSECTIONLINK__ ' end

--- -- Exports ---

local p = {}

function p._exportClasses return { Navigator = Navigator } end

function p._aan(args, cfg, currentTitle) cfg = cfg or mw.loadData('Module:Automatic archive navigator/config') currentTitle = currentTitle or mw.title.getCurrentTitle local aan = Navigator.new(args, cfg, currentTitle) return tostring(aan) end

function p.aan(frame) local args = require('Module:Arguments').getArgs(frame, {		wrappers = 'Template:Automatic archive navigator',	}) return p._aan(args) end

return p