Awkward Advent of Code solutions (2019, day 6)

solve-make.sh

#!/bin/bash

chain() {
	awk -F')' '
		{ printf "%s: %s\n\t# %s\n", $2, $1, $2 }
		END { print "COM:" }
	' | make -f- "$1"
}

checksums() {
	objs=$(cut -d')' -f2 "$1" | grep -Ev 'COM|SAN|YOU')
	for o in $objs; do chain "$o" <"$1"; done | wc -l
}

transfers() {
	comm -3 <(chain YOU <"$1") <(chain SAN <"$1") \
		| awk 'END { print NR - 2 }' # Subtract YOU and SAN
}

checksums "$1"
transfers "$1"