#!/bin/sh

out_str="<ul class='gallery'>\n"
for f in img/*.jpg; do
    img_name=$(basename $f);
    echo "Processing image '${f}'..."
    magick "$f" -thumbnail '320x320^' -gravity center -extent 320x320 -quality 72 "img/thumb/$img_name"
    out_str="${out_str}<li> <a href='img/${img_name}'><img src='img/thumb/${img_name}' width='320' height='320'></a> </li>\n"
done;

out_str="${out_str}</ul>\n"

printf "${out_str}"