Suggested function: bytearray.to_hex / bytearray.from_hex

[Pi Lanningham]

When debugging, it'd be super helpful to be able to hex-encode a bytearray so I can pass it to trace; You might just say use cbor.diagnostic, but I prefer the hex view over cbor.diagnostic.

There may be other use cases, though not many come to mind.

[Pi Lanningham]

(feel free to close if you feel this is out of scope, just dropping the suggestion here while it's on my mind)

[Matthias Benkort]

Honestly. from_hex is going to be a pain in the a** on chain, especially without bitwise primitives. Though writing an encoder may be more reasonable. Actually, so "reasonable" that we already did it 😬!

stdlib/lib/aiken/cbor.ak

Lines 212 to 237 in a467c81

 fn encode_base16(bytes: ByteArray, ix: Int, builder: ByteArray) -> ByteArray { 
   if ix < 0 { 
     builder 
   } else { 
     let byte = index_bytearray(bytes, ix) 
     let msb = byte / 16 
     let lsb = byte % 16 
     let builder = 
       cons_bytearray( 
         msb + if msb < 10 { 
           48 
         } else { 
           55 
         }, 
         cons_bytearray( 
           lsb + if lsb < 10 { 
             48 
           } else { 
             55 
           }, 
           builder, 
         ), 
       ) 
     encode_base16(bytes, ix - 1, builder) 
   } 
 } 

So I guess it's mainly about moving that function to the bytearray module

[Lucas]

@KtorZ I have a little example for to_hex at least