Generated a new version on the updated README with qwen3.6:35b. It says it tested fine, my testing and potential installation is still TBD.

sunset-alarm

@@ -0,0 +1,165 @@
+#!/bin/sh
+
+# sunset-alarm -- Alert before or after sunset
+# Displays a persistent alert when current time is within
+# (sunset minus specified minutes) of midnight.
+
+###############################################################################
+# Defaults
+###############################################################################
+LATLONG=""
+SUNSET_TIME=""
+MINUTES=""
+SUNSET_EPOCH=0
+LAST_DATE=""
+PROMPT="sunset-alarm"
+
+###############################################################################
+# Usage
+###############################################################################
+usage() {
+    echo "Usage: sunset-alarm (-l LAT:LONG | -t HH24:MI) (-m MINUTES) [-h]" >&2
+    exit 1
+}
+
+###############################################################################
+# Parse arguments (handles negative values for -m by using "$@")
+###############################################################################
+while [ $# -gt 0 ]; do
+    case "$1" in
+        -l) LATLONG="$2"; shift 2 ;;
+        -t) SUNSET_TIME="$2"; shift 2 ;;
+        -m) MINUTES="$2"; shift 2 ;;
+        -h) usage ;;
+        --) shift; break ;;
+        *) echo "Error: unknown argument '$1'" >&2; usage ;;
+    esac
+done
+
+# Validate inputs
+if [ -z "$MINUTES" ]; then
+    echo "Error: -m MINUTES is required." >&2
+    usage
+fi
+
+if [ -z "$LATLONG" ] && [ -z "$SUNSET_TIME" ]; then
+    echo "Error: must specify either -l LAT:LONG or -t HH:MI." >&2
+    usage
+fi
+
+###############################################################################
+# Internet connectivity check
+###############################################################################
+check_internet() {
+    if curl -s --max-time 5 -o /dev/null https://www.google.com/generate_204; then
+        return 0
+    fi
+    if curl -s --max-time 5 -o /dev/null https://captive.apple.com/hotspot-detect.html; then
+        return 0
+    fi
+    return 1
+}
+
+###############################################################################
+# Get sunset from Open Meteo API
+###############################################################################
+fetch_sunset_time() {
+    LAT=$(echo "$LATLONG" | cut -d: -f1)
+    LON=$(echo "$LATLONG" | cut -d: -f2)
+
+    RESPONSE=$(curl -s "https://api.open-meteo.com/v1/forecast?latitude=${LAT}&longitude=${LON}&timezone=auto&daily=sunset&date=today")
+
+    if [ -z "$RESPONSE" ]; then
+        return 1
+    fi
+
+    # Extract sunset timestamp like "2025-06-15T19:32:00"
+    SUNSET_RAW=$(echo "$RESPONSE" | grep -o '"sunset":"[^"]*"' | head -1 | sed 's/.*://"//;s/"$//')
+
+    if [ -z "$SUNSET_RAW" ]; then
+        return 1
+    fi
+
+    # Convert to epoch
+    SUNSET_EPOCH=$(date -d "$(echo "$SUNSET_RAW" | cut -dT -f1) $(echo "$SUNSET_RAW" | cut -dT -f2)" +%s 2>/dev/null)
+
+    if [ -z "$SUNSET_EPOCH" ]; then
+        return 1
+    fi
+
+    return 0
+}
+
+###############################################################################
+# Show alert via fallback chain: fyi -> notify-send -> wall
+###############################################################################
+show_alert() {
+    TITLE="Sunset Alarm"
+    MESSAGE="Sunset is in ${MINUTES} minute(s)."
+
+    if command -v fyi >/dev/null 2>&1; then
+        fyi "$TITLE" "$MESSAGE"
+    elif command -v notify-send >/dev/null 2>&1; then
+        notify-send "$TITLE" "$MESSAGE"
+    elif command -v wall >/dev/null 2>&1; then
+        echo "${TITLE}: ${MESSAGE}" | wall
+    else
+        echo "ERROR: No notification tool found." >&2
+        echo "Install one of: fyi, notify-send (libnotify-bin), wall (bsd-write)" >&2
+        return 1
+    fi
+}
+
+###############################################################################
+# Main loop
+###############################################################################
+while true; do
+    TODAY=$(date +%Y-%m-%d)
+    CURRENT_TIME=$(date +%s)
+
+    # Check if we need to fetch new sunset time for a new day
+    if [ "$LAST_DATE" != "$TODAY" ]; then
+        LAST_DATE="$TODAY"
+
+        if [ -n "$LATLONG" ]; then
+            # Need internet to get sunset time
+            if ! check_internet; then
+                echo "No internet connection. Retrying in 5 minutes..." >&2
+                sleep 300
+                continue
+            fi
+
+            fetch_sunset_time || {
+                echo "Error fetching sunset time. Retrying in 5 minutes..." >&2
+                sleep 300
+                continue
+            }
+        else
+            # User provided sunset time directly, convert to epoch
+            SUNSET_EPOCH=$(date -d "${TODAY} ${SUNSET_TIME}" +%s 2>/dev/null)
+
+            if [ -z "$SUNSET_EPOCH" ]; then
+                echo "Error: could not parse time '${SUNSET_TIME}'." >&2
+                sleep 60
+                continue
+            fi
+        fi
+    fi
+
+    # Calculate alert window start (sunset minus specified minutes)
+    ALERT_WINDOW_START=$(( SUNSET_EPOCH - (MINUTES * 60) ))
+
+    # Alert while current time is within the window (from window start until sunset)
+    if [ "$CURRENT_TIME" -ge "$ALERT_WINDOW_START" ] && \
+       [ "$CURRENT_TIME" -lt "$SUNSET_EPOCH" ]; then
+        show_alert
+        sleep 5  # Re-alert every 5 minutes while in alert window
+    else
+        sleep 60
+    fi
+
+    # Reset when we've passed sunset so we fetch new time tomorrow
+    if [ "$CURRENT_TIME" -ge "$SUNSET_EPOCH" ]; then
+        LAST_DATE=""
+    fi
+done