Module:Redirect: Difference between revisions
From All Skies Encyclopaedia
imported>Darklama (consistent parsing of passed page name, output when passed bracket, and interpretation of redirect) |
imported>Darklama (update comment) |
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--[=[ |
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---- This module accepts the name of a single page. It determines if the page is a redirect; if so it looks up the page, |
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Given a single page name determines what page, if any, it redirects to and returns the target page name, or the |
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---- extracts the target, and returns the target name as text. Its usage is {{#invoke:redirect|main|redirect-page-name}}. |
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passed page name if not a redirect. The passed page name can be given as plain text or as a page link. The |
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---- The template neither takes nor gives square brackets, so to show the result as a link use |
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returned page name is as plain text, or when the bracket parameter is given, as a page link. An error message |
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is returned if page does not exist or the redirect target cannot be determined for some reason. |
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---- but for versatility no error is given if the file is not a redirect (returns the original text) |
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---- or if the file name is blank (returns blank). |
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Thus these are roughly the same: |
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--]=] |
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p={} |
p={} |
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Revision as of 20:36, 17 April 2013
Documentation for this module may be created at Module:Redirect/doc
--[=[
Given a single page name determines what page, if any, it redirects to and returns the target page name, or the
passed page name if not a redirect. The passed page name can be given as plain text or as a page link. The
returned page name is as plain text, or when the bracket parameter is given, as a page link. An error message
is returned if page does not exist or the redirect target cannot be determined for some reason.
Thus these are roughly the same:
[[{{#invoke:redirect|main|redirect-page-name}}]] and {{#invoke:redirect|main|redirect-page-name|bracket=yes}}
--]=]
p={}
function p.main(frame)
local args, pargs = frame.args, (frame:getParent() or {}).args or {}
local rname, bracket = args[1] or pargs[1], args.bracket or pargs.bracket
if not rname or not mw.ustring.match(rname, "%S") then return "" end
bracket = bracket and "[[%s]]" or "%s"
rname = mw.ustring.match(rname,"%[%[(.+)%]%]") or rname
local rpage, err = mw.title.new(rname)
-- avoid expensive operation when nothing to do
if not rpage then
err = "File not found (mw.title.new failed)"
elseif rpage.id == 0 then
err = "File not found (id=0):"
elseif not rpage.isRedirect then
return mw.ustring.format(bracket, rname) -- not a redirect so use passed page name (for some general-purpose template use)
else
local redirect = mw.ustring.match( rpage:getContent() or "", "^#[Rr][Ee][Dd][Ii][Rr][Ee][Cc][Tt]%s*%[%[(.-)%]%]" )
if redirect then
return mw.ustring.format(bracket, redirect)
end
err = "failed to understand"
end
return '<span style="text-color:red;">[[Module:redirect]] error: ' .. err .. ' - [[' .. rname .. ']]</span>'
end
return p
