Pushed a new update today. You can now restore a HD wallet with its BIP-39 mnemonic code, here is how to use it:
restore Create a wallet based on a BIP-39 mnemonic seed
Usage: restore [options]
Options:
-t, --time
Replay blockchain starting from this time (UNIX epoch time)
Default: 1421548754
Example:
$ termwallet restore -t 1409478661
Seed: yard impulse luxury drive today throw farm pepper survey wreck glass federal
Once run, it will prompt you for the 12-word mnemonic code and automatically restore the wallet. The blockchain is replayed from the time parameter, which defaults to the current time. It is in the format of UNIX Epoch time (converter here:
http://www.epochconverter.com/). If addresses in the wallet have past transactions, set the time to the first transaction (or, to be safe, a little bit before).