![]() | This is the module sandbox page for Module:Highest archive number (diff). See also the companion subpage for test cases (run). |
![]() | 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 finds the highest archive number for a given set of numbered archive pages. The only input required is the prefix of the archive set. For example, for Talk:France/Archive 1, Talk:France/Archive 2, etc., the prefix would be "Talk:France/Archive ".
The module uses an exponential search algorithm, so it will make relatively few expensive function calls even for large numbers of archives. (The expensive function call is necessary to determine whether an individual archive exists.) For 1-10 archive pages, the module typically uses 4-6 expensive function calls; for 20-100 archives, it uses 6-12 calls; and for hundreds of archives, it uses 12-20 calls.
Because the module uses an exponential search, no gaps are allowed in the archive numbers; if there are any gaps, then the module may return the number of any archive page that exists where the following archive page does not exist. However, archive numbers do not have to start at 1; if they start at a higher number, you can specify this number in the start
parameter.
Usage
editFrom wikitext
editFrom wikitext this module is usually used via the {{highest archive number}} template. However, it is also possible to use it directly from invoke with the syntax {{#invoke:highest archive number|main|prefix|start=start}}
.
From Lua
editLoad the module with the following code:
local mHAN = require('Module:Highest archive number')
You can then use it like this:
mHAN._main(prefix, start)
The prefix variable is the prefix of the archive set.
Examples
edit#invoke code | Lua code | Result |
---|---|---|
{{#invoke:highest archive number|main|Wikipedia:Administrators' noticeboard/IncidentArchive}}
|
mHAN._main("Wikipedia:Administrators' noticeboard/IncidentArchive")
|
1165 |
{{#invoke:highest archive number|main|Talk:Byzantine Empire/Archive }}
|
mHAN._main("Talk:Byzantine Empire/Archive ")
|
16 |
{{#invoke:highest archive number|main|Wikipedia talk:WikiProject Chemicals/Archive |start=2005}}
|
mHAN._main("Wikipedia talk:WikiProject Chemicals/Archive ", 2005)
|
2024 |
-- This module finds the highest existing archive number for a set of talk
-- archive pages.
local expSearch = require('Module:Exponential search')
local p = {}
local function raiseStartNumberError(start)
error(string.format(
'Invalid start number "%s" supplied to [[Module:Highest archive number]] (must be an integer)',
tostring(start)
), 3)
end
local function pageExists(page)
local success, exists = pcall(function()
return mw.title.new(page).exists
end)
return success and exists
end
function p._main(prefix, start)
-- Check our inputs
if type(prefix) ~= 'string' or not prefix:find('%S') then
error('No prefix supplied to [[Module:Highest archive number]]', 2)
end
if start ~= nil and (type(start) ~= "number" or math.floor(start) ~= start) then
raiseStartNumberError(start)
end
start = start or 1
-- Do an exponential search for the highest archive number
local result = expSearch(function (i)
local archiveNumber = i + start - 1
local page = prefix .. tostring(archiveNumber)
return pageExists(page)
end, 10)
if result == nil then
-- We didn't find any archives for our prefix + start number
return nil
else
-- We found the highest archive, but the number is always 1-based, so
-- adjust it for our start number
return result + start - 1
end
end
function p.main(frame)
local args = require('Module:Arguments').getArgs(frame, {
trim = false,
removeBlanks = false,
wrappers = 'Template:Highest archive number'
})
local prefix = args[1]
-- Get the start archive number, if specified.
local start = args.start
if start == "" then
start = nil
elseif start then
start = tonumber(start)
if not start then
raiseStartNumberError(args.start)
end
end
return p._main(prefix, start)
end
return p