Prints the next few Lawrence/Lakeside buses departure times from the Princeton CS department.

bus_times.sh

#!/bin/bash
# Bus times last updated 2015-11-04
# Steven Englehardt (github.com/englehardt)
bus_times=('7:16' '7:46' '8:16' '8:26' '8:36' '8:46' '8:56' '9:06' '9:16' '9:26' '9:36' '9:46' '9:56' '10:06' '10:16' '10:26' '10:36' '10:46' '10:56' '11:06' '11:16' '11:46' '12:16' '12:46' '13:16' '13:46' '14:16' '14:46' '15:16' '15:46' '16:16' '16:46' '17:16' '17:46' '18:16' '18:31' '18:46' '19:01' '19:16' '19:31' '19:46' '20:19' '21:04' '21:49' '22:34' '23:19')
on_demand=('22:00' '3:00')

limit=4
if [ $# -eq 1 ]; then
    limit=$1
fi

printed=0
printf '\n Next bus departure times from the Friend Center \n'
for i in ${bus_times[@]}; do
    diff=$(((`date --date=$i +%s` -`date +%s`)/60))
    if [ $diff -gt 0 ]; then
        echo ' --' `date --date=$i +%I:%M%p` ' (' $diff ' minutes)'
        ((printed++))
    fi
    if [ $printed -ge $limit ]; then 
        break
    fi
done
if [ $(date +%s) -gt $(date --date=${on_demand[0]} +%s) ] || \
   [ $(date +%s) -lt $(date --date=${on_demand[1]} +%s) ]; then
    diff=$(((`date --date=${on_demand[1]} +%s` -`date +%s`)/60))
    if [ $diff -lt 0 ]; then
        diff=$(($diff + 1440))
    fi
    end_time=`date --date=${on_demand[1]} +%I:%M%p`
    echo ' -- On-demand bus until' $end_time '('$diff 'minutes) - 609.258.7433'
fi

printf '\n'