feat(cast): add --from-rlp & --to-rlp

[0xvv]

Implementation of feature #1433

• --to-rlp and --from-rlp for single item
• rlp for lists
• rlp for nested lists
• strip and add 0x to hex
• accepting json type array as input

[onbjerg]

flag to toggle adding 0x to hex output ?

I don't think a flag to add it makes a lot of sense since you can just do "0x$(cast --to-rlp ...)"

[tynes]

flag to toggle adding 0x to hex output ?

I don't think a flag to add it makes a lot of sense since you can just do "0x$(cast --to-rlp ...)"

Should it always return 0x prefixed output for --to-rlp to match the behavior of other commands?

$ cast --to-uint256 0
0x0000000000000000000000000000000000000000000000000000000000000000

Definitely would like if --from-rlp worked on 0x prefixed strings as well! Thank you for this :)

[gakonst]

thx for this @0xvv, wonder what your plans are for getting this over the line :D

[0xvv]

lil update, encoding is working but i still have quite a lot of work on decoding and arguments parsing

[0xvv]

I'm still gonna add some finishing touches but most of the code is here, any feedback welcome.

Also what is the better way to handle string or hex input in the cli ? i don't think having 4 flags is the best, is the --from-rlp even useful ? I kinda mindlessly added it but is there really a use case ?

Here are some usage examples for reference

[0xvv]

ℹ️ Just renamed --from-rlp-hex to --hex-from-rlp for consistency

[mattsse]

thanks for this,

couple of smol nits

[onbjerg]

Some minor nits (feel free to skip) but also some questions about the functionality

[mattsse]

thanks!

this looks complete, mind adding casttest! to test these?

see https://github.com/foundry-rs/foundry/blob/master/cli/tests/it/cast.rs

[0xvv]

thanks!

this looks complete, mind adding casttest! to test these?

Added a couple, i can add some more cases if needed