[scripts/wastickers] Added stickerpack generator

scripts/wastickers

@@ -0,0 +1,54 @@
+#!/bin/env zsh
+#
+## Enable MAX STRICTNESS mode
+set -euo pipefail
+setopt nomatch nullglob
+
+# Make checking for command existence easier
+command_exists() { whence -- "$@" &>/dev/null; }
+
+# Create a temporary folder for pack generation which will be
+# deleted at the very end of the process
+cwd=$(pwd)
+mkdir -p $cwd/tmp
+
+# Make sure the webp processing tool is present
+if ! command_exists cwebp; then
+  echo "cwebp not found; Make sure it is installed. Exiting."
+  exit 1
+fi
+
+if ! command_exists zip; then
+  echo "zip not found; Make sure it is installed. Exiting."
+  exit 1
+fi
+
+# Read the metadata we will pipe to `author.txt` and `title.txt`
+# Seriously, why are these separate text file? At the very least
+# store the metadata somewhere reasonable such as a JSON file.
+vared -p 'Author: ' -c author
+vared -p 'Pack name: ' -c pname
+echo "$author" > "$cwd/tmp/author.txt"
+echo "$pname" > "$cwd/tmp/title.txt"
+
+for image in *.png *.jpg *.jpeg; do
+  cp "$image" "$cwd/tmp/"
+done
+
+cd "$cwd/tmp"
+
+# Every copy of the images we made above will be converted
+# into a webp, then the copy will be deleted.
+# To make sure all images get a separate timestamp, we wait
+# one second for every image.
+for image in *.png *.jpg *.jpeg; do
+  cwebp -q 60 $image -o "$(date +%s).webp" > /dev/null 2>&1
+  rm -rf $image
+  sleep 1
+done
+
+# Finally, pack up our stickers and clean up the temp dir
+zip -r -j "$pname.wastickers" "$cwd/tmp";
+mv "$cwd/tmp/$pname.wastickers" "$cwd";
+cd "$cwd";
+rm -rf "$cwd/tmp";