add wallset script

bin/wallset

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+../wallset/wallset.sh

wallset/README.md

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+# wallset
+
+## About
+Set the wallpaper and generate a lockscreen image with betterlockscreen.
+
+The new wallpaper will be copied and converted to ``~/.config/wall.png``
+
+## Requirements
+- [imagemagick](https://imagemagick.org/)
+- [feh](https://feh.finalrewind.org/)
+- [betterlockscreen](https://github.com/betterlockscreen/betterlockscreen)
+- [notify-send](https://gitlab.gnome.org/GNOME/libnotify) (optional)

wallset/wallset.sh

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+#!/bin/sh
+
+notify() {
+    if [ "$(command -v notify-send)" ]; then
+        notify-send "$@"
+    fi
+}
+
+IMAGE="$1"
+WALLPAPER="$HOME/.config/wall.png"
+
+echo "Converting image..."
+convert "$IMAGE" "$WALLPAPER" > /dev/null
+
+echo "Setting wallpaper..."
+feh --bg-scale "$WALLPAPER" > /dev/null
+
+generate_lockscreen() {
+    if betterlockscreen -u "$WALLPAPER" > /dev/null; then
+        notify "wallset" "Lockscreen generated!"
+    else
+        notify --urgency critical "wallset" "Error while generating lockscreen"
+    fi
+}
+echo "Generating lockscreen in the background..."
+generate_lockscreen &
+
+echo "Done!"