day04/count_valid_passports.sh

   1 #!/bin/bash
   2
   3 declare -a data
   4 cur_data=""
   5 seperator=""
   6 valid_count=0
   7
   8 required_fields=(byr iyr eyr hgt hcl ecl pid)
   9 exec 3<input.txt
  10
  11 while read -u 3 line; do
  12     if [ "$line" = "" ]; then
  13         data+=("$cur_data")
  14         seperator=""
  15         cur_data=""
  16         continue
  17     fi
  18     cur_data="${cur_data}${seperator}$line"
  19     seperator=" "
  20 done
  21
  22 # on the last line, if cur_data isn't empty, add that to the array
  23 if [ "$cur_data" != "" ]; then
  24     data+=("$cur_data")
  25 fi
  26
  27 verify_data() {
  28     local -n record=$1
  29
  30     for field in ${required_fields[@]}; do
  31         if ! [ ${kvp[$field]+a} ]; then
  32             exit 1
  33         fi
  34     done
  35
  36     exit 0
  37 }
  38
  39 for (( i=0; i<${#data[@]}; i++ )); do
  40     record="${data[$i]}"
  41     declare -A kvp
  42     for field in $record; do
  43         key=${field%:*}
  44         value=${field#*:}
  45         kvp[$key]=$value
  46     done
  47     if ( verify_data kvp ); then
  48         valid_count=$((valid_count+1))
  49     fi
  50     unset kvp
  51 done
  52
  53 echo "$valid_count valid entries"