Wikipedia API

local wikipedia = {}

local function request(url)
    local valid, reason = http.checkURL(url)
    if not valid then print("URL is invalid:", reason) return nil end
    local response, reason, err = http.get(url)
    if not response then print("Request failed:", reason) return nil end
    return response.readAll()
end

local function jsonrequest(url)
    local response = request(url)
    if not response then return nil end
    local result, reason = textutils.unserializeJSON(response)
    if not result then print("Deserialization failed:", reason) return nil end
    return result
end

function wikipedia.search(query)
    local srsearch = textutils.urlEncode(query)
    local url = "http://en.wikipedia.org/w/api.php?action=query&list=search&format=json&srsearch="..srsearch
    local response = jsonrequest(url)
    return response
end

return wikipedia