Module:HeroImage

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

local p = {}

local function isUrl(value)
    return type(value) == "string" and value:match("^https?://")
end

local function isHtmlImg(value)
    return type(value) == "string" and value:match("^<img")
end

local function getFileUrl(value)
    if isUrl(value) then
        return value
    end
    if isHtmlImg(value) then
        return value
    end

    return mw.getCurrentFrame():callParserFunction("filepath", value)
end

function p.show(frame)
    local src = frame.args[1] or frame.args.src
    local scale = tonumber(frame.args.scale) or 1

    if not src then
        return "''No image provided''"
    end

    local url = getFileUrl(src)

    -- If user provides literal <img>, return it untouched
    if isHtmlImg(url) then
        return frame:extensionTag("html", url)
    end

    -- Build <img>
    local img = mw.html.create("img")
        :attr("src", url)
        :css("max-width", 18 * scale .. "px")
        :css("height", "auto")
        :css("image-rendering", "pixelated")

    return frame:extensionTag("html", tostring(img))
end

return p