WGET for 1.7.10

-- wget substitute for ComputerCraft 1.7.10
local tArgs = {...}
if #tArgs < 2 then
    print("Usage: wget <url> <filename>")
    return
end

if not http then
    printError("wget requires http API")
    printError("Set http_enable to true in ComputerCraft.cfg")
    return
end

local url = tArgs[1]
local filename = tArgs[2]
local path = shell.resolve(filename)

if fs.exists(path) then
    print("File already exists")
    return
end

write("Connecting to "..url.." ... ")
local response = http.get(url)
if not response then
    print("Failed.")
    return
end

print("Success.")
local contents = response.readAll()
response.close()

local file = fs.open(path, "w")
file.write(contents)
file.close()
print("Downloaded as "..filename)