A simple bash script that generates a monthly printout calendar template to be used between an employer and employee
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#!/usr/bin/env bash
# monthly-attendace-paper - A simple bash script that generates a monthly
# printout template to be used between an employer and employee.
#
# Written in 2017 by Franco Masotti/frnmst <franco.masotti@student.unife.it>
#
# To the extent possible under law, the author(s) have dedicated all
# copyright and related and neighboring rights to this software to the public
# domain worldwide. This software is distributed without any warranty.
#
# You should have received a copy of the CC0 Public Domain Dedication along
# with this software. If not, see
# <http://creativecommons.org/publicdomain/zero/1.0/>.
. ./configrc
declare -A days_string
days_string[Mon]="$Mon"
days_string[Tue]="$Tue"
days_string[Wed]="$Wed"
days_string[Thu]="$Thu"
days_string[Fri]="$Fri"
days_string[Sat]="$Sat"
days_string[Sun]="$Sun"
declare -A days_id
days_id[0]=Mon
days_id[1]=Tue
days_id[2]=Wed
days_id[3]=Thu
days_id[4]=Fri
days_id[5]=Sat
days_id[6]=Sun
###
printf "%s\n\n\n" "$title"
printf "%s\n\n" "$employer"
printf "%s\n\n" "$employee"
printf "%s\n" "$date_id"
printf "\n\n"
###
is_febuary="false"
if [ "$this_month" = "02" ]; then
is_febuary="true"
fi
# Algorithm got from Wikipedia.
is_leap_year="false"
if [ $(($this_year % 4)) -ne 0 ]; then
is_leap_year="false"
elif [ $(($this_year % 100)) -ne 0]; then
is_leap_year="true"
elif [ $(($this_year % 400)) -ne 0]; then
is_leap_year="false"
else
is_leap_year="true"
fi
get_cal="$(cal -m $this_month $this_year | awk 'NF > 0' | tail -n +3)"
# Starting from monday (1) get the first and last day id of the month.
first_cal_line="$(printf "%s" "$get_cal" | head -n1)"
last_cal_line="$(printf "%s" "$get_cal" | tail -n1)"
first_day_id=$(printf "$first_cal_line" | wc -w)
first_day_id=$((7-$first_day_id+1))
first_day_id=$(($first_day_id-1))
last_day_id=$(printf "%s" "$last_cal_line" | wc -w)
last_day_number=$(echo $last_cal_line | awk "{print \$$last_day_id}")
last_day_id=$(($last_day_id-1))
day_offset=15
if [ "$is_febuary" = "true" ]; then
day_offset=14
fi
month="$(seq 1 $day_offset)"
tabulation()
{
printf "\t\t\t"
}
newline()
{
printf "\n\n\n"
}
get_full_string()
{
local day=$1
local ds="$2"
printf "$day/$this_month\t$ds"
}
print_day()
{
local day=$1
local day_id=$2
local dd="${days_id[$day_id]}"
local ds="${days_string[$dd]}"
# If sunday
if [ $dd = $highlited_day ]; then
printf "||"
get_full_string "$day" "$ds"
printf "||"
else
printf " "
get_full_string "$day" "$ds"
printf " "
fi
}
print_day_left()
{
print_day $1 $2
tabulation
}
print_day_right()
{
print_day $1 $2
newline
}
day_id=$first_day_id
for day in $month; do
print_day_left $day $(($day_id % 7))
print_day_right $(($day + $day_offset)) $((($day_id + $day_offset) % 7))
day_id=$(($day_id + 1))
done
# Months with 31 days.
if [ $last_day_number -eq 31 ]; then
tabulation
printf "\t\t"
print_day_right 31 $((($day_id + $day_offset) % 7))
fi
if [ "$is_leap_year" = "true" ]; then
tabulation
printf "\t\t"
print_day_right 29 $((($day_id + $day_offset) % 7))
fi
printf "%s\n" "$format"