gistfile1.bash

#!/usr/bin/zsh

out_html="$HOME/sandbox/pics.html"
top_dir="$HOME/sandbox/pics"
gal="$top_dir/gallery"

header="HEADER TEXT"
footer="FOOTER TEXT"

mklnk() {
        print '<a href="'"$1"'"><img src="'"$2"'" /></a>' >> $out_html
}

cp $out_html ${out_html}.orig
print $header > $out_html

arr=( ${(f)"$(find $gal -name '*_th.*')"} )
for i in $arr ; do
        full=$(print $i | sed 's/_th//')
        mklnk $full $i
done

print $footer >> $out_html

cat $out_html

# ls -r pics
# pics:
#gallery  pics.html  thumbs
#
#pics/gallery:
#a  b
#
#pics/gallery/a:
#pic1.png  pic1_th.png
#
#pics/gallery/b:
#pic2.png  pic2_th.png
#
#pics/thumbs:
#thumb1.png  thumb2.png  thumb3.png

# cat pics.html
#HEADER TEXT
#<a href="/home/dbb/sandbox/pics/gallery/b/pic2.png"><img src="/home/dbb/sandbox/pics/gallery/b/pic2_th.png" /></a>
#<a href="/home/dbb/sandbox/pics/gallery/a/pic1.png"><img src="/home/dbb/sandbox/pics/gallery/a/pic1_th.png" /></a>
#FOOTER TEXT

#!/usr/bin/zsh

gal="$HOME/sandbox/pics/gallery"
thumb_dir="$HOME/sandbox/pics/thumbs"

thumbs=( ${(f)"$(find $thumb_dir -name '*.png*')"} )

for i in $thumbs; do
    rename 's/\.png/_th.png/' $i
done

cp -ir ${thumb_dir}/* $gal