Extract tile heads from a minecraft world

extract-heads.sh

# Depends on:
# sudo apt install libjson-perl
# sudo apt install libcompress-raw-zlib-perl

if [[ ! -d world ]]; then
    tar -xf ${1} world
fi

if [[ ! -d run ]]; then
    git clone https://github.com/MirrgieRiana/nbt_to_json_perl.git run
fi

if [[ ! -f run/mca.jar ]]; then
     wget https://github.com/Querz/mcaselector/releases/download/2.1/mcaselector-2.1.jar -O run/mca.jar
fi

mkdir -p scratch/json
mkdir -p scratch/csv
mkdir -p target

java -jar run/mca.jar --mode select --world world --query 'Palette contains "player_head"' --output scratch/csv/mca.tiles.csv
java -jar run/mca.jar --mode select --world world --query 'Entities contains "armor_stand"' --output scratch/csv/mca.entities.csv
jq -R -r '[. | split(";")] | map((.[0]|tonumber), (.[1]|tonumber), (fmod(.[2]|tonumber; 32)|length), (fmod(.[3]|tonumber; 32)|length)) | @csv' scratch/csv/mca.tiles.csv > scratch/csv/tiles.csv
jq -R -r '[. | split(";")] | map((.[0]|tonumber), (.[1]|tonumber), (fmod(.[2]|tonumber; 32)|length), (fmod(.[3]|tonumber; 32)|length)) | @csv' scratch/csv/mca.entities.csv > scratch/csv/entities.csv

wait_for_jobs () {
  while test $(jobs -p | wc -w) -ge "$((2*$(nproc)))"; do wait -n; done
}

get_tile_heads() {
    ./run/region ${1} ${2} ${3} | ./run/inflate-zlib | ./run/nbt2json | jaq -r '[.. | select(.key? == "textures") | .value.values[][].value]' > scratch/json/${1##*/}.${2}.${3}.tile.json
}

get_entity_heads() {
    ./run/region ${1} ${2} ${3} | ./run/inflate-zlib | ./run/nbt2json | jaq -r '[.. | select(.key? == "textures") | .value.values[][].value]' > scratch/json/${1##*/}.${2}.${3}.entity.json
}

while IFS="," read -r rx rz x z; do
    wait_for_jobs
    get_tile_heads "world/region/r.${rx}.${rz}.mca" ${x} ${z} &
done < scratch/csv/tiles.csv

while IFS="," read -r rx rz x z; do
    wait_for_jobs
    get_entity_heads "world/entities/r.${rx}.${rz}.mca" ${x} ${z} &
done < scratch/csv/entities.csv

yq -y -s '. | add | unique' scratch/json/*.json > target/heads.yml