advent-of-code/2024/day-17/solution-2.sh

#!/usr/bin/env bash

FILE=$1
ITER=99
DEBUG=false

REG_A=$(grep 'Register A:' "$FILE" | cut -f2 -d: )
REG_B=$(grep 'Register B:' "$FILE" | cut -f2 -d: )
REG_C=$(grep 'Register C:' "$FILE" | cut -f2 -d: )
read -r -a INPUT <<< "$(grep 'Program:' "$FILE" | cut -f2 -d: | tr ',' ' ' )"
INPUT_LEN=${#INPUT[@]}

printf "Registers A: %s B: %s C: %s\n" "$REG_A" "$REG_B" "$REG_C" >&2
printf "Input : " >&2
printf "%s " "${INPUT[@]}" >&2
printf "\n" >&2

# Load machine operations
. machine.sh

POINTER=0
while [[ $POINTER -lt $INPUT_LEN ]]
do
  OPCODE=${INPUT[$POINTER]}
  OPERAND=${INPUT[$POINTER+1]}
  read_opcode "$OPCODE" "$OPERAND"
  printf "Registers A : %s B: %s C : %s\n" "$REG_A" "$REG_B" "$REG_C" >&2
  printf "Pointer : %s\n" "$POINTER" >&2
  (( ITER-- ))
  if [[ $ITER -eq 0 ]] ; then break ;fi
done | paste -s -d ","