Module:Check for deprecated parameters

-- This module may be used to compare the arguments passed to the parent

-- with a list of arguments, returning a specified result if an argument is

-- on the list

local p = {}

local function trim(s)

return s:match('^%s*(.-)%s*$')

end

local function isnotempty(s)

return s and trim(s) ~= ''

end

function p.check (frame)

-- create the table of deprecated values and their matching new value

local args = frame.args

local dep_values = {}

for k, v in pairs(args) do

if k == 'ignoreblank' or k == 'preview' or k == 'deprecated' then else

dep_values[k] = v

end

end

-- loop over the parent args and see if any are deprecated

local values = {}

local ignoreblank = isnotempty(frame.args['ignoreblank'])

local pargs = frame:getParent().args

for k, v in pairs(pargs) do

if ignoreblank then

if dep_values[k] and v~='' then

table.insert(values, k)

end

else

if dep_values[k] then

table.insert(values, k)

end

end

end

-- add results to the output tables

local res = {}

if #values > 0 then

local preview = frame.args['preview'] or

'Page using '..frame:getParent():getTitle()..' with deprecated parameter _VALUE_'

if isnotempty(preview) then

preview = require('Module:If preview')._warning({

preview

})

end

-- Kind of dangerous to trust that this is never nil, but I guess it's

-- preferable to display that the use of the module is broken rather than

-- have some sort of tracking category for pages which have an unknown

-- parent tracking template.

local category = frame.args['category']

for k, v in pairs(values) do

local c = category:gsub('_VALUE_', v)

table.insert(res, c)

if v == '' then

-- Fix odd bug for | = which gets stripped to the empty string

-- and breaks category links

v = ' '

end

local p = preview:gsub(

'_VALUE_',

'"'..v..'". Replace with "'..dep_values[v]..'".'

)

table.insert(res, p )

end

end

return table.concat(res)

end

return p