Display calendar agenda using the Google command line tool.

gcal

#!/usr/bin/env bash

function print_help {
    echo "Display the week's agenda from Google Calendar."
    echo "Usage: $(basename $0) [options]"
    echo "  -h        Show this usage guide."
    echo "  -t        Today's agenda."
    echo "  -m        Month agenda."
    echo "  -E        Only display Event calendar."
    echo "[Add event]"
    echo "  -a=event  Add calendar event."
    echo "  -d=date   Date to add event."
}

GOOGLECL=$(which google)
if [ ! -x "$GOOGLECL" ]; then
    echo "Error: Requires the Google command line tool."
    exit 1
fi

function display_calendar {
    if [ -n "$MONTH_VIEW" ]; then
        cal -3
    else
        cal
    fi
    if [ -n "$TODAY_VIEW" ]; then
        echo -e "\nAgenda for $DATE_FROM:"
    else
        echo -e "\nAgenda for $DATE_FROM to $DATE_TO:"
    fi
    if [ -z "$CALS" ]; then
        CALS=".*" #if no calendar specified, show all
    fi
    $GOOGLECL calendar list --cal "$CALS" --date "$DATE_FROM,$DATE_TO" --delimiter ": "
}

function add_event {
    $GOOGLECL calendar add "$EVENT_MSG$EVENT_DATE"
}

#parse args
while getopts "mtEa:d:h" option; do
    case $option in
        m) DATE_TO=$(date --date="1 month" +"%F"); MONTH_VIEW=1;;
        t) DATE_TO=$(date +"%F"); TODAY_VIEW=1;;
        E) CALS="Events";;
        a) EVENT_MSG="$OPTARG";;
        d) EVENT_DATE=", $OPTARG";;
        h) print_help; exit 0;;
        \?) print_help; exit 0;;
    esac
done

if [ -n "$EVENT_MSG" ]; then
    add_event
    exit 0
fi


DATE_FROM=$(date +"%F") #today

if [ -z "$DATE_TO" ]; then
    DATE_TO=$(date --date="1 week" +"%F")
fi

display_calendar