# move or rename a file

const context = env.ctx
if context.argv:len() < 3 do fail("usage: mv <source> <destination>\n") end
else do
  const source = expand_path(context.argv[1])
  const destination = expand_path(context.argv[2])
  const size = fs:size(source)
  if size < 0 do fail("mv: #{source}: no such file\n") end
  else do
    const contents = if size > 0 fs:read_bytes(source, 0, size) else ""
    if fs:store(destination, contents) == 1 do fs:unlink(source) puts("#{source} -> #{destination}\n") end
  end
end