Elide the extension in the wallpapaer filename

.config/setup/01-install-packages.sh

@@ -87,6 +87,7 @@ DEB_PKGS=(
     xdg-desktop-portal-wlr
     xournalpp
     yt-dlp
+    awscli
     zip
     # keep-sorted end
 )

.config/systemd/user/get-nasa-apod.service

@@ -0,0 +1,10 @@
+[Unit]
+Description=Refresh the wallpaper using the NASA Astronomy Picture of the Day
+Wants=get-nasa-apod.timer
+
+[Service]
+WorkingDirectory=%h
+ExecStart=%h/.local/bin/get-nasa-apod
+
+[Install]
+WantedBy=default.target

.config/systemd/user/get-nasa-apod.timer

@@ -0,0 +1,10 @@
+[Unit]
+Description=Daily NASA wallpaper fetch
+Requires=get-nasa-apod.service
+
+[Timer]
+Unit=nasa-apod.service
+OnCalendar=daily
+
+[Install]
+WantedBy=timers.target

.local/bin/get-nasa-apod

@@ -0,0 +1,41 @@
+#! /usr/bin/bash
+
+set -euo pipefail
+IFS=$'\n\t'
+
+API_KEY="${NASA_API_KEY:-DEMO_KEY}"
+if [ "${API_KEY}" = "DEMO_KEY" ]; then
+    echo "No API key set! using demo key."
+fi
+
+WALLPAPERS="$(systemd-path user)"/Wallpapers
+
+mkdir --parents "${WALLPAPERS}"
+
+APOD_URL="https://api.nasa.gov/planetary/apod?api_key=${API_KEY}"
+response="$(curl --silent "${APOD_URL}")"
+picture_date="$(printf '%s' "${response}" | jq --raw-output .date)"
+picture_url="$(printf '%s' "${response}" | jq --raw-output .hdurl)"
+
+extension="${picture_url##*.}"
+filename="${picture_date}.${extension}"
+outfile="${WALLPAPERS}/${filename}"
+
+if [ -f "${outfile}" ]; then
+    echo "Target file already exists"
+    exit 0
+fi
+
+tempfile="$(mktemp)"
+curl \
+    --location \
+    --output "${tempfile}" \
+    --silent \
+    "${picture_url}"
+mv "${tempfile}" "${outfile}"
+ln \
+    --force \
+    --symbolic \
+    "${outfile}" \
+    "${WALLPAPERS}/today"
+swaymsg reload