Batch convert images files jpg, png to webp also in subfolders - linux

Question

I have found a script to convert files in a directoy
but I need this with subdirectors
Can you help me ?
#!/bin/bash
PATH=/usr/local/bin:/usr/bin:/bin
# cd to the directory of the image so we can work with just filenames
dir="$(dirname "$1")"
cd "$dir" || exit 1
base="$(basename "$1" .png)"
# create a WebP version of the PNG
cwebp -q 80 "$base".png -o "$base".webp
# delete the WebP file if it is equal size or larger than the original PNG
if [[ `stat -c '%s' "$base".webp` -ge `stat -c '%s' "$base".png` ]]; then
echo "Deleting WebP file that is no smaller than PNG"
rm -f "$base".webp
fi
# delete the WebP file if it is size 0
if [[ -f "$base".webp && ! -s "$base".webp ]]; then
echo "Deleting empty WebP file"
rm -f "$base".webp
fi

Answer 1

Good news: You won't be have to change the script!
you can find all directories inside the root dir by the command:
find /path/to/root/dir -type d
and you can add execute of some command for each found dir:
Assuming your script name is script.sh and it is located in your home dir, and you want to run it on all sub dirs under current dir (include the current dir):
find . -type d -exec ~/script.sh "{}" \;

Answer 2

I had a similar issue when trying to find jpg images in a directory tree. The tree command helped me greatly. Below is sample code I used to iterate through all directories and only function on those with jpg images.
tree -dfi ${dir_name} | sed 's/$/\//g' | while read line
do
if [ `ls "${line}" | grep -ci jpg` -gt 0 ]
then
some code
fi
done
In your case you could grep for only PNG or perhaps do both jpg and png. One other option would be find commands using the file name and output to a while loop
find ${dir_name} -type f -name "*.jpg" | while read line
do
some code
done