Module:Archive list
This Lua module is used on approximately 68,000 pages and changes may be widely noticed. Test changes in the module's /sandbox or /testcases subpages, or in your own module sandbox. Consider discussing changes on the talk page before implementing them. |
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. |
Module:Archive list can be applied to any talk page or discussion archive, and will return links to all the numbered archives of that page or its parent page. By default the module uses the naming convention specified at WP:ARCHIVE, Talk:PAGENAME/Archive 1
, with a capital A, a space before the number, and no leading zeros. This module should not usually be substituted – that way, the list of links will update itself whenever a new numbered archive is added. For ease of access, {{archive list}} can be used.
This module is used in {{Archives}} to produce a box of numbered archive links without entering them all manually.
Usage
- Main
The main function. Returns a list of archive links.
{{#invoke:Archive list|main | root = | links = | nobr = | prefix = | prefixspace = | linkprefix = | linkprefixspace = | sep = | linesep = | start = | max = | auto = | leavefirstcellblank = }}
- Count
The count function. Returns the number of the most recent archive.
{{#invoke:Archive list|count | root = | prefix = | prefixspace = }}
Parameters
Valid parameters are:
root = <root>
- use this to specify a root other than that of the page from which the template is transcluded.links = #
- the number of links to display per line. The default is 10.nobr = yes
- set this toyes
to remove all line breaks. This parameter cannot be used in conjunction with|links=
.prefix = <prefix>
- a custom prefix for the archives, without the number. The default is "Archive ".prefixspace = yes
- adds a space between the prefix and the archive number for prefixes specified with|prefix=
.linkprefix = <linkprefix>
- a custom prefix for the display links, without the number. The default is blank. If auto=long, use 'none' to have it blank.prefixspace = yes
- adds a space between the link prefix and the archive number for prefixes specified with|linkprefix=
.sep = <sep>
- the separator for archive links. The default value is the comma separator for the language set in your preferences: ",
". If this is set to eitherdot
(·
),pipe
(|
),comma
(,
), ortpt-languages
(⧼tpt-languages-separator⧽
), then it uses that separator as specified for your default language. If it is any other value, that value is used as it is. If this module is called from #invoke then whitespace is stripped, but if called from another module then whitespace is preserved. This allows for other modules to use this module to create wikitables, etc. If called from #invoke, the whitespace problem can be worked around by using 
(for spaces) and<br />
(for new lines).linesep = <linesep>
- the separator for lines of archive links. The possible input values are the same as for the|sep=
parameter, and the default separator text is<br />
. How often the value is displayed depends on the value of|links=
.start = #
- the archive number to start listing archives from. This must be smaller than the largest archive number, or|max=
if it is specified.max = #
- the largest archive number to list. This overrides the automatic detection of archive page numbers.auto = long
- outputs as a table. Changes default value of links to 3 and linkprefix to 'Archive '.leavefirstcellblank = yes
- leave the first cell of the first row empty, so that each row starts on a multiple of the number of links per line. In other words, this aligns the first column to contain round numbers (multiples of thelinks
param). This can make long archive lists easier to read. This option is off by default for compatibility.
Limitations
The old {{archive list}} template was limited to detecting 200 archives. This module has no such limitation. However, at very high numbers of archives this module might reach the expensive function call limit. On a page with no other templates that call expensive functions, this module should be able to output 400,000+ archive links. On pages with other templates that make expensive function calls, the module may fail sooner.
-- This module implements {{archive list}} in Lua, and adds a few
-- new features.
-- Process a numeric argument to make sure it is a positive
-- integer.
local function processNumArg( num )
if num then
num = tonumber( num )
if type( num ) == 'number' then
num = math.floor( num )
if num >= 0 then
return num
end
end
end
return nil
end
-- Checks whether a page exists, going through pcall
-- in case we are over the expensive function limit.
local function checkPageExists( title )
if not title then
error('No title passed to checkArchiveExists', 2)
end
local noError, titleObject = pcall(mw.title.new, title)
if not noError then
-- If we are over the expensive function limit then assume
-- that the page doesn't exist.
return false
else
if titleObject then
return titleObject.exists
else
return false -- Return false if given a bad title.
end
end
end
-- Checks every nth archive to see if it exists, and returns the
-- number of the first archive that doesn't exist. It is
-- necessary to do this in batches because each check is an
-- expensive function call, and we want to avoid making too many
-- of them so as not to go over the expensive function limit.
local function checkArchives( prefix, n, start )
local i = start
local exists = true
while exists do
exists = checkPageExists( prefix .. tostring( i ) )
if exists then
i = i + n
end
end
return i
end
-- Return the biggest archive number, using checkArchives()
-- and starting in intervals of 1000. This should get us a
-- maximum of 500,000 possible archives before we hit the
-- expensive function limit.
local function getBiggestArchiveNum( prefix, start, max )
-- Return the value for max if it is specified.
max = processNumArg( max )
if max then
return max
end
-- Otherwise, detect the largest archive number.
start = start or 1
local check1000 = checkArchives( prefix, 1000, start )
if check1000 == start then
return 0 -- Return 0 if no archives were found.
end
local check200 = checkArchives( prefix, 200, check1000 - 1000 )
local check50 = checkArchives( prefix, 50, check200 - 200 )
local check10 = checkArchives( prefix, 10, check50 - 50 )
local check1 = checkArchives( prefix, 1, check10 - 10 )
-- check1 is the first page that doesn't exist, so we want to
-- subtract it by one to find the biggest existing archive.
return check1 - 1
end
-- Get the archive link prefix (the title of the archive pages
-- minus the number).
local function getPrefix( root, prefix, prefixSpace )
local ret = root or mw.title.getCurrentTitle().prefixedText
ret = ret .. '/'
if prefix then
ret = ret .. prefix
if prefixSpace == 'yes' then
ret = ret .. ' '
end
else
ret = ret .. 'Archive '
end
return ret
end
-- Get the number of archives to put on one line. Set to
-- math.huge if there should be no line breaks.
local function getLineNum( links, nobr, isLong )
local linksToNum = tonumber( links )
local lineNum
if nobr == 'yes' or (links and not linksToNum) then
lineNum = math.huge
-- If links is a number, process it. Negative values and expressions
-- such as links=8/2 produced some interesting values with the old
-- template, but we will ignore those for simplicity.
elseif type(linksToNum) == 'number' and linksToNum >= 0 then
-- The old template rounded down decimals to the nearest integer.
lineNum = math.floor( linksToNum )
if lineNum == 0 then
-- In the old template, values of links between 0 and 0.999
-- suppressed line breaks.
lineNum = math.huge
end
else
if isLong==true then
lineNum = 3 -- Default to 3 links on long
else
lineNum = 10 -- Default to 10 on short
end
end
return lineNum
end
-- Gets the prefix to put before the archive links.
local function getLinkPrefix( prefix, space, isLong )
-- Get the link prefix.
local ret = ''
if isLong==true then ---- Default of old template for long is 'Archive '
if type(prefix) == 'string' then
if prefix == 'none' then -- 'none' overrides to empty prefix
ret = ''
else
ret = prefix
if space == 'yes' then
ret = ret .. ' '
end
end
else
ret = 'Archive '
end
else --type is not long
if type(prefix) == 'string' then
ret = prefix
if space == 'yes' then
ret = ret .. ' '
end
end
end
return ret
end
-- Get the number to start listing archives from.
local function getStart( start )
start = processNumArg( start )
if start then
return start
else
return 1
end
end
-- Get whether to leave a blank cell in the first row and column
-- If links start at 1, and lineNum is a round number, this aligns the first
-- column to start on a multiple of lineNum, which may be a nice round number
local function getLeaveFirstCellBlank( leaveFirstCellBlank )
return leaveFirstCellBlank == 'yes'
or leaveFirstCellBlank == 'y'
or leaveFirstCellBlank == 1
end
-- Process the separator parameter.
local function getSeparator( sep )
if sep and type(sep) == 'string' then
if sep == 'dot'
or sep =='pipe'
or sep == 'comma'
or sep == 'tpt-languages' then
return mw.message.new( sep .. '-separator' ):plain()
else
return sep
end
else
return nil
end
end
-- Generates the list of archive links. glargs.max must be either zero (for
-- no archives) or a positive integer value.
local function generateLinks( glargs )
if type( glargs ) ~= 'table' or not glargs.max or not glargs.prefix then
error('insufficient arguments passed to generateLinks', 2)
end
-- If there are no archives yet, return a message and a
-- link to create Archive one.
if glargs.max == 0 then
if glargs.isLong == true then
glargs.max = 1 -- One archive redlink is displayed for Long format
else -- Short error and a creat link is displayed for short
return 'no archives yet ([[' .. glargs.prefix .. '1|create]])'
end
end
-- Return an html error if the start number is greater than the
-- maximum number.
local start = glargs.start or 1
if start > glargs.max then
return '<span class="error">Start value "'
.. tostring( start )
.. '" is greater than the most recent archive number "'
.. tostring( glargs.max )
.. '".</span>'
end
local linkPrefix = glargs.linkPrefix or ''
local lineNum = glargs.lineNum or 10
local sep = '' -- Long default separator is cell elements, short is ', '
local lineSep = '' -- Long default linebreak is row elements short is '\n'
if glargs.isLong==true then
sep = glargs.sep or ''
sep = sep .. '</td><td>'
lineSep = glargs.lineSep or ''
lineSep = lineSep .. '</td></tr><tr><td>'
else
sep = glargs.sep or mw.message.new( 'comma-separator' ):plain()
lineSep = glargs.lineSep or '<br />'
end
-- Generate the archive links.
local lineCounter = 1 -- The counter to see whether we need a line break or not.
local ret = {} -- A table containing the strings to be returned.
if glargs.isLong == true then --Long version is a table
table.insert(ret, "<table style=\"width: 100%; padding: 0px; text-align: center; background-color: transparent;\"><tr><td>")
end
if glargs.leaveFirstCellBlank then
-- An empty first cell aligns the first column on multiples of lineNum
table.insert(ret, sep)
lineCounter = lineCounter + 1
end
for archiveNum = start, glargs.max do
local link = mw.ustring.format(
'[[%s%d|%s%d]]',
glargs.prefix, archiveNum, linkPrefix, archiveNum
)
table.insert( ret, link )
-- If we don't need a new line, output a comma. We don't need
-- a comma after the last link.
if lineCounter < lineNum and archiveNum < glargs.max then
table.insert( ret, sep )
lineCounter = lineCounter + 1
-- Output new lines if needed. We don't need a new line after
-- the last link.
elseif lineCounter >= lineNum and archiveNum < glargs.max then
table.insert( ret, lineSep )
lineCounter = 1
end
end
if glargs.isLong == true then --Long version is a table
table.insert(ret, "</td></tr></table>")
end
return table.concat( ret )
end
-- Determine if format should be long
local function findFormType( auto )
if auto == nil or auto == '' then
return false
elseif auto == 'long' then
return true
else
return false
end
end
-- Get the archive data and pass it to generateLinks().
local function _main( args )
local isLong = findFormType( args.auto )
local prefix = getPrefix( args.root, args.prefix, args.prefixspace )
local lineNum = getLineNum( args.links, args.nobr, isLong )
local linkPrefix = getLinkPrefix( args.linkprefix, args.linkprefixspace, isLong )
local start = getStart( args.start )
local max = getBiggestArchiveNum( prefix, start, args.max )
local sep = getSeparator( args.sep )
local lineSep = getSeparator( args.linesep )
local leaveFirstCellBlank = getLeaveFirstCellBlank( args.leavefirstcellblank )
local glargs = {
start = start,
max = max,
prefix = prefix,
linkPrefix = linkPrefix,
isLong = isLong,
sep = sep,
lineNum = lineNum,
lineSep = lineSep,
leaveFirstCellBlank = leaveFirstCellBlank
}
return generateLinks( glargs )
end
-- A wrapper function to make getBiggestArchiveNum() available from
-- #invoke.
local function _count( args )
local prefix = getPrefix( args.root, args.prefix, args.prefixspace )
local archiveMax = getBiggestArchiveNum( prefix )
return archiveMax
end
function makeWrapper( func )
return function( frame )
-- If we are being called from #invoke, get the args from #invoke
-- if they exist, or else get the arguments passed to the parent
-- frame. Otherwise, assume the arguments are being passed directly
-- in from another module or from the debug console.
local origArgs
if frame == mw.getCurrentFrame() then
origArgs = frame:getParent().args
for k, v in pairs( frame.args ) do
origArgs = frame.args
break
end
else
origArgs = frame
end
-- Ignore blank values for parameters other than "links",
-- which functions differently depending on whether it is
-- blank or absent.
local args = {}
for k, v in pairs( origArgs ) do
if k == 'links' or v ~= '' then
args[k] = v
end
end
return func( args )
end
end
return {
main = makeWrapper( _main ),
count = makeWrapper( _count )
}