Module:AutomaticArchiveNavigator

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

--
-- This module implements {{Automatic archive navigator}}
--
 
local p = {}
 
local args
local frame = mw.getCurrentFrame()
local thisPage = mw.title.getCurrentTitle()

-- Get the name of the subpage a certain distance away.
-- e.g. if the current subpage is /Archive 27, getSubpageName(3) returns 'Archive 30'
local function getSubpageName(offset)
    local startIdx, endIdx, archiveNum = mw.ustring.find(thisPage.subpageText, '^Archive ([0-9]+)')
    if archiveNum then
        return 'Archive ' .. (archiveNum + offset)
    else
        return thisPage.subpageText + offset
    end
end

-- Get a formatted link to the subpage a certain distance away, or nil
-- if that subpage does not exist.
local function getSubpageLink(offset)
    local subpageName = getSubpageName(offset)
    local page = mw.title.new(thisPage.baseText .. '/' .. subpageName, thisPage.namespace)
    if page.exists then
        return '[[../' .. subpageName .. '|' .. subpageName .. ']]'
    else
        return nil
    end
end

local function getLinksText()
    local arrowSpacer = '  '
    local linkSpacer = '    '
    if mw.ustring.len(thisPage.subpageText) <= 4 then
        -- If page names are short, we want more space. But why the mix of regular, non-breaking, and em spaces?
        local emSpace = frame:expandTemplate({title = 'Unicode', args = {mw.ustring.char(8195)}})
        arrowSpacer = '&nbsp; ' .. emSpace .. ' &nbsp;&nbsp;'
        linkSpacer = '&nbsp; ' .. emSpace .. ' &nbsp; ' .. emSpace .. '&nbsp;'
    end
    
    local s = ''
    
    for offset = -5, -3 do
        local link = getSubpageLink(offset)
        if link then
            if offset == -3 then
                s = s .. link .. linkSpacer
            else
                s = s .. link .. ' ←' .. arrowSpacer
            end
            break
        end
    end
    
    for offset = -2, -1 do
        local link = getSubpageLink(offset)
        if link then
            s = s .. link .. linkSpacer
        end
    end

    s = s .. '<span style="font-size:115%;">[[' .. thisPage.fullText .. '|' .. getSubpageName(0) .. ']]</span>'
    
    for offset = 1, 2 do
        local link = getSubpageLink(offset)
        if link then
            s = s .. linkSpacer .. link
        end
    end
    
    for offset = 5, 3, -1 do
        local link = getSubpageLink(offset)
        if link then
            if s == 3 then
                s = s .. linkSpacer .. link
            else
                s = s .. arrowSpacer .. '→ ' .. link
            end
            break
        end
    end

    return s
end

local function getMessage()
    if args[1] == '1' then
        return ''
    else
        local msg = '----\n'
        if args.text then
            msg = msg .. args.text
        else
            msg = msg .. "This is an '''[[Help:Archiving a talk page|archive]]''' of past discussions"
            if args.period then
                msg = msg .. "&#32;for the period '''" .. args.period .. "'''"
            end
            msg = msg .. ". '''Do not edit the contents of this page.''' If you wish to start a new discussion or revive an old one, please do so on the "
            msg = msg .. "[[" .. thisPage.baseText .. "|current talk page]]."
        end
        return msg
    end
end

local function _aan()
    local image = args.image
    if not image then
        image = '[[File:' .. (args.icon or 'Replacement filing cabinet.svg') .. '|40x40px|alt=|link=]]'
    end
    
    local mbox = frame:expandTemplate({title = 'tmbox', args = {
        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 = getLinksText() .. '\n' .. getMessage()
    }})
    
    return mbox .. '__NONEWSECTIONLINK__ __NOEDITSECTION__'
end

function p.aan(frame)
    local origArgs
    -- If called via #invoke, use the args passed into the invoking template.
    -- Otherwise, for testing purposes, assume args are being passed directly in.
    if frame == mw.getCurrentFrame() then
        origArgs = frame:getParent().args
    else
        origArgs = frame
    end
 
    -- ParserFunctions considers the empty string to be false, so to preserve the previous 
    -- template behavior, change any empty arguments to nil, so Lua will consider
    -- them false too.
    args = {}
    for k, v in pairs(origArgs) do
        if v ~= '' then
            args[k] = v
        end
    end
 
    if args.title then
        thisPage = mw.title.new(args.title)
    end
    
    return _aan()
end
 
return p