Module: WikidataCheck

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

local p = {}

function p.wikidatacheck(frame)
    local pframe = frame:getParent()
    local config = frame.args -- the arguments passed BY the template, in the wikitext of the template itself
    local args = pframe.args -- the arguments passed TO the template, in the wikitext that transcludes the template
    
    local property = config.property
    local value = config.value or ""
    local catbase = config.category
    local namespaces = config.namespaces
    local ok = false -- one-way flag to check if we're in a good namespace
    local ns = mw.title.getCurrentTitle().namespace
    for v in mw.text.gsplit( namespaces, ",", true) do
        if tonumber(v) == ns then
            ok = true
        end
    end
    if not ok then -- not in one of the approved namespaces
        return ""
    end
    local entity = mw.wikibase.getEntityObject()
    if not entity then -- no Wikidata item
        return "[[Category:" .. catbase .. " not in Wikidata]]"
    end
    local claims = entity.claims or {}
    local hasProp = claims[property]
    if not hasProp then -- no claim of that property
        return "[[Category:" .. catbase .. " not in Wikidata]]" -- bad. Bot needs to add the property
    end
    local propValue = hasProp[1].mainsnak.datavalue.value -- This should eventually iterate over all possible values?
    if value == "" then
        return nil -- Using Wikidata
    elseif propValue == value then
        return "[[Category:" .. catbase .. " same as Wikidata]]" -- yay!
    else
        return "[[Category:" .. catbase .. " different from Wikidata]]" -- needs human review :(
    end
end

return p