make_gallery.sh

#!/usr/bin/env bash
# set -e

# Usage: ./make_gallery.sh
#
# Run in a directory with a "papes/" subdirectory, and it will create a
# "thumbnails/" subdirectory.
#
# Uses imagemagick's `convert`, so make sure that's installed.
# On Nix, nix-shell -p imagemagick --run ./make_gallery.sh

rm -rf thumbnails
mkdir thumbnails

url_root="https://raw.githubusercontent.com/jonascarpay/Wallpapers/master"

echo "### Wallpapers" >README.md
echo "My current wallpaper rotation" >>README.md
echo "" >>README.md

total=$(ls papes | wc -l)

i=0

git ls-files papes/ -z | while read -d $'\0' src; do
    ((i++))
    filename="$(basename "$src")"
    printf '%4d/%d: %s\n' "$i" "$total" "$filename"

    convert -resize 200x "$src" "${src/papes/thumbnails}"

    filename_escaped="${filename// /%20}"
    thumb_url="$url_root/thumbnails/$filename_escaped"
    pape_url="$url_root/papes/$filename_escaped"

    echo "[![$filename]($thumb_url)]($pape_url)" >>README.md
done