generated from me/template-mit
78 lines
3.1 KiB
Bash
78 lines
3.1 KiB
Bash
#!/usr/bin/env bash
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# sunset-alarm — persistent alert at a calculated offset before sunset
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# Usage: sunset-alarm (-l LAT:LONG | -t HH24:MI) (-m MINUTES) [-h]
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set -uo pipefail
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SUNSET_EPOCH="" # epoch of today's sunset
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ALERT_EPOCH="" # epoch when the window opens (sunset - offset)
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OFFSET_MIN=0 # signed minute offset from sunset
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LAT="" # latitude (-l/--location)
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LON="" # longitude
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HARDCODED_TIME="" # HH:MM string (-t/--hardcoded)
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usage() {
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cat <<'EOF'
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Usage: sunset-alarm (-l LAT:LONG | -t HH24:MI) (-m MINUTES) [-h]
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Options:
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-l LAT:LONG Latitude and longitude, e.g. 32.123:-111.111
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(queried from Open-Meteo for today's sunset time)
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-t HH24:MI Hardcoded sunset time to use instead.
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When combined with -l the offset is applied against
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this time and the network call is skipped.
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-m MINUTES Minutes before (-), at (= 0), or after (+) sunset
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to trigger the alert. May be negative.
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-h Show this help message and exit.
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Examples:
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sunset-alarm -l 32.123:-111.111 -m 90 # 90 min before actual sunset
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sunset-alarm -t 18:00 -m -5 # 5 min after the hardcoded time
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EOF
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}
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die() { echo "Error: $*" >&2; exit 1; }
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# ── resolve a fallback command at startup ──────────────────────────
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NOTIFY_CMD=""
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for _cmd in fyi notify-send wall; do
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if command -v "$_cmd" >/dev/null 2>&1; then
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NOTIFY_CMD="$_cmd"; break
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fi
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done
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fire_alert() {
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local body="$1"
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case "$NOTIFY_CMD" in
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fyi) fyi "Sunset Alarm: ${body}" ;;
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notify-send) notify-send -u normal "Sunset Alarm" "${body}" 2>/dev/null || true ;;
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wall) echo "Sunset Alarm: ${body}" | wall 2>/dev/null || printf 'Sunset Alarm: %s\n' "$body" ;;
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esac
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}
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# ── open-meteo helper ─────────────────────────────────────────────
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fetch_sunset_epoch() {
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local lat="$1" lon="$2"
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# curl –silent + HTTP code tail so we can detect failures.
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local resp; resp=$(curl -sfw "\n%{http_code}" \
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"https://api.open-meteo.com/v1/forecast?latitude=${lat}&longitude=${lon}¤t=sunset&timezone=auto" \
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--connect-timeout 10 --max-time 30) || return 1
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local code="${resp##*$'\n'}"
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resp="${resp%$'\n'*}" # strip the trailing HTTP code
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[[ "${code:-599}" == "200" ]] || return 2
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local iso; iso=$(printf '%s\n' "$resp" | jq -r '.current.sunset // empty')
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[[ -n "$iso" ]] || return 3 # null / missing field
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SUNSET_EPOCH=$(date -d "$iso" +%s) # local-time epoch
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}
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# Build today's sunset epoch from a hardcoded HH:MM when -t is used.
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set_sunset_from_time() {
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local hhmm="$1"
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local Y M D h m
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read -r Y M D h m <<< "$(date +%Y-%m-%d) $(echo "$hhmm" | tr ':' ' ')"
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SUNSET_EPOCH=$(date -d "${Y}-${M}-${D} ${h}:${m}:00" 2>/dev/null +%s \
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|| die "Invalid time format '${hhmm}')")
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