Shell script to download all wad files from `levels/doom2` (or whichever path you choose) using the idgames archive API. Requires `jq` and `curl`

idgames-dl.sh

# Settings
API_URL=https://doomworld.com/idgames/api/api.php
MIRROR_URL=https://youfailit.net/pub/idgames/

# Get directories
echo "Getting directories from API"
curl -s "$API_URL?action=getdirs&name=levels/doom2/&out=json" | jq '.content.dir[].name' > paths.txt
sed -i 's/"//g' paths.txt

# Aggregate the wad URLs
echo "Getting files in each directory from API"
while IFS= read -r line
do
URL="$API_URL?action=getcontents&name=$line&out=json"
curl -s $URL | jq '.content.file[].idgamesurl' >> wads.txt
done < paths.txt

# Create the URLs
sed -i "s|idgames://|$MIRROR_URL|g" wads.txt
sed -i "s|"|g" wads.txt

# Download the files
while IFS= read -r line
do
echo "Downloading $line"
curl -# -O "$line"
done < wads.txt