96 lines
2.5 KiB
Bash
96 lines
2.5 KiB
Bash
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#!/usr/bin/env bash
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set -o errexit
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set -o nounset
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set -o pipefail
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if [[ "${TRACE-0}" == "1" ]]; then
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set -o xtrace
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fi
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cd "$(dirname "$0")"
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INPUT_FILE="$1"
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get_seed_pairs ()
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{
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IFS=" " read -r -a seeds <<< "$(grep seeds "${INPUT_FILE}" | cut -d ' ' -f 2-)"
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seed_count="${#seeds[@]}"
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pairs=$((seed_count/2))
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for ((i=0; i<pairs; i++)); do
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j=$((i*2))
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k=$((i*2+1))
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seed_pairs[${seeds[${j}]}]="${seeds[${k}]}"
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done
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}
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gen_map ()
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{
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# Generates files for given index of map in input file.
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local paragraph map_name map_content
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paragraph=$(($1+1)) # number of paragraph in input file
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map_name=$(awk -v RS= "{if(NR == ${paragraph}) print}" "${INPUT_FILE}" | head -n 1 | cut -d ' ' -f 1)
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map_content=$(awk -v RS= "{if(NR == ${paragraph}) print}" "${INPUT_FILE}"| tail -n +2)
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echo "${map_content}" > "${map_name}.map"
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maps+=("${map_name}.map")
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}
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map_seed ()
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{
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# Usage: map_seed MAP_FILE SEED_NUMBER
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# Prints the mapping of the seed number in the give map.
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local map seed dest_start source_start length diff
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map="$1"
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seed="$2"
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while read -r line; do
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dest_start=$(cut -d ' ' -f 1 <<< "${line}")
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source_start=$(cut -d ' ' -f 2 <<< "${line}")
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length=$(cut -d ' ' -f 3 <<< "${line}")
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if [[ ${seed} -ge ${source_start} && ${seed} -le $((source_start+length-1)) ]]; then
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diff=$((seed-source_start))
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echo -n $((dest_start+diff))
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return
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fi
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done < "${map}"
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echo -n "${seed}" # no mapping
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}
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main ()
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{
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declare -A seed_pairs=()
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declare -a maps=()
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local map_count destination lowest length seed
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get_seed_pairs
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map_count=$(awk -v RS= 'END {print NR}' "${INPUT_FILE}")
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map_count=$((map_count-1)) # one of the paragraphs in the file is seeds
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for ((i=1; i<=map_count; i++)); do
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gen_map "${i}"
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done
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lowest=''
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for s in "${!seed_pairs[@]}"; do
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length=${seed_pairs[${s}]}
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echo "running from start ${s} length ${length}"
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for ((z=0; z<length; z++)); do
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y=$((s+z))
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destination=''
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for map in "${maps[@]}"; do
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if [[ -z ${destination} ]]; then
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destination=$(map_seed "${map}" "${y}")
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else
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destination=$(map_seed "${map}" "${destination}")
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fi
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done
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if [[ -z ${lowest} ]]; then
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lowest="${destination}"
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elif [[ ${destination} -lt ${lowest} ]]; then
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lowest="${destination}"
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fi
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echo "iteration ${z} seed ${y} destination ${destination}"
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done
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echo "interim lowest: ${lowest}"
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done
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echo "${lowest}"
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rm -f ./*.map
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}
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main
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