Module:YearNav

local p = {}

function p.YearNav(frame) Pattern = frame.args[1] or -1

if Pattern==-1 then Pattern = "####-10 ・・ ####-1 ・ #### ・ ####+1 ・・ ####+10" --Default. Will be overwritten if something was there. for i,v in pairs(frame.args) do           Pattern= i .. "=" .. v       end end

ThisPageTitle = mw.title.getCurrentTitle Prefix = ThisPageTitle.nsText Namespace = ThisPageTitle.namespace PageName = ThisPageTitle.text --Prefix = "Category" --Namespace = 0 --PageName = "1987 Sandwiches"

_, _, OriginalYear = string.find(PageName, "(%d%d%d%d)") PageWithout = string.gsub(PageName, OriginalYear, "@@@@")

CurrentText = Pattern

itsthere, _, _, _ = string.find(CurrentText, "####([%+%-])(%d+)")

while itsthere do --Continue while there are still instances in the pattern to alter _, _, plusminus, amount = string.find(CurrentText, "####([%+%-])(%d+)") if plusminus=="-" then NewYear = OriginalYear - amount else --assume it's plus NewYear = OriginalYear + amount end NewPageName = string.gsub(PageWithout, "@@@@", NewYear) if Namespace==0 then ReplacementSection = "" .. NewPageName .. "" else ReplacementSection = "" .. NewPageName .. "" end CurrentText = string.gsub(CurrentText, "####[%+%-]%d+", ReplacementSection, 1) itsthere, _, _, _ = string.find(CurrentText, "####([%+%-])(%d+)") end

CurrentText = string.gsub(CurrentText, "####", PageName)

return CurrentText

end

return p