rename repo, subdir for yearly challenges

2020/day04/ex1.bash

@@ -0,0 +1,51 @@
+#!/bin/bash
+#
+# ex1.bash: Advent2020 game, day 4/game 1.
+
+CMD=${0##*/}
+shopt -s extglob
+
+declare -A KEYS
+KEYS=( ["byr"]="" ["iyr"]="" ["eyr"]="" ["hgt"]="" ["hcl"]="" ["ecl"]=""
+	   ["pid"]="" ["cid"]="" )
+
+function reset_array() {						  # reset array values
+	local -n array=${1}
+	local key
+
+	#echo before reset: ${KEYS[@]}
+	for key in "${!array[@]}"; do
+		array[$key]=""
+	done
+	#echo after reset: ${KEYS[@]}
+}
+
+function passport_valid() {
+	local -i ret=0
+
+	for key in "${!KEYS[@]}"; do
+		[[ $key != "cid" ]] && [[ -z ${KEYS[$key]} ]] && ret=1 && break
+	done
+	return $ret
+}
+
+declare -i current=0 nvalids=0
+
+while read -r line; do
+	if [[ -z "$line" ]]; then
+		((current++))
+		passport_valid && ((nvalids ++))
+		reset_array KEYS
+		continue
+	fi
+	for pair in $line; do
+		key=${pair%%:*}
+		val=${pair##*:}
+		[[ -v KEYS[$key] ]] && KEYS[$key]="$val"  # valid key
+	done
+done
+((current++))
+passport_valid && ((nvalids ++))
+printf "%s : valid=%d/%d\n" "$CMD" "$nvalids" "$current"
+
+exit 0