Audio alerts for specific times on Mac OS.

meeting_alert.sh

#!/bin/bash

message_volume=30

# Check if at least one argument is provided
if [ $# -eq 0 ]; then
    echo "Usage: $0 \"9\" \"1:30\" \"15:00\""
    exit 1
fi

# Function to infer AM or PM and convert to 24-hour format
convert_to_24_hour() {
    local time="$1"
    if [[ "$time" =~ ^([0-9]{1,2})(:([0-9]{2}))?$ ]]; then
        hour=${BASH_REMATCH[1]}
        minute=${BASH_REMATCH[3]:-00}  # Default to 00 if minutes are not provided
        if (( hour == 12 )); then
            # Special case for 12:00 PM
            printf "%02d:%02d\n" "$hour" "$minute"
        elif (( hour >= 8 && hour <= 11 )); then
            # AM times
            printf "%02d:%02d\n" "$hour" "$minute"
        else
            # PM times
            hour=$((hour + 12))
            printf "%02d:%02d\n" "$hour" "$minute"
        fi
    else
        echo "Invalid time format: $time"
        exit 1
    fi
}

# Convert all provided meeting times to 24-hour format and store them in an array
MEETING_TIMES_24=()
for time in "$@"; do
    MEETING_TIMES_24+=("$(convert_to_24_hour "$time")")
done

# Sort the meeting times to determine the latest one
IFS=$'\n' sorted_times=($(printf "%s\n" "${MEETING_TIMES_24[@]}" | sort))
unset IFS
# Determine the last index of the sorted_times array
last_index=$((${#sorted_times[@]} - 1))
latest_time=${sorted_times[$last_index]}

while true; do
    # Get the current time in 24-hour format
    CURRENT_TIME=$(date +%H:%M)
    
    # Check if the current time matches any of the meeting times
    for meeting_time in "${MEETING_TIMES_24[@]}"; do
        if [[ "$CURRENT_TIME" == "$meeting_time" ]]; then
            original_volume=$(osascript -e "output volume of (get volume settings)")
            osascript -e "set volume output volume $message_volume"
            echo "$meeting_time meeting starting now"
            say "Next meeting starting now"
            osascript -e "set volume output volume $original_volume"
            # Sleep for 60 seconds to avoid multiple alerts within the same minute
            sleep 60
        fi
    done

    # Terminate the script if the current time is past the latest meeting time
    if [[ "$CURRENT_TIME" > "$latest_time" ]]; then
        echo "All meetings for today are done."
        exit 0
    fi
    
    # Wait for 1 minute before checking again
    sleep 1
done