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#!/bin/bash
###################################################################################################
# leap-year
###################################################################################################
# Core algorithm credits to Copyright (c) 2005 nixCraft project <http://cyberciti.biz/fb/>
# Tweakings & additions made by Jean-Christophe Manciot <jcmanciot@sdxlive.com>
#
# Licensed under a GPLv2 License or above; you may not use this file except in compliance with
# the License. You may obtain a copy of the License at
#
# https://www.gnu.org/licenses/old-licenses/gpl-2.0.md
#
# The licensor cannot revoke these freedoms as long as you follow the license terms.
#
# Attribution — You must give appropriate credit, provide a link to the license, and indicate if
# changes were made. You may do so in any reasonable manner, but not in any way that
# suggests the licensor endorses you or your use.
###################################################################################################
###################################################################################################
#
# Checking whether the parameter is a leap year or not
#
###################################################################################################
#
# Parameters:
# ----------
#
# - <year> contains the year to check
#
# - -<anything> will display this help message
#
###################################################################################################
#
# Returned values:
# ---------------
#
# - true: the <year> is a leap year
# - false the <year> is not a leap year
#
###################################################################################################
#
# Usage example:
# -------------
#
# leap-year 2017
#
###################################################################################################
if [[ $LEAP_YEAR == ON ]]; then
# Getting the last existing file descriptor of ~/.drive-google/logs/drive-google.log
fd=$(ls -al /proc/$$/fd | grep ~/.drive-google/logs/drive-google.log | sed -E 's|^.* ([0-9]+) -> .*$|\1|g' | sort -V | tail -n 1)
# Case where fd is unset, i.e the file ~/.drive-google/logs/drive-google.log has not yet been opened
if [[ -z $fd ]]; then
lowest_unused_fd ()
{
local fd=0
while [ -e /proc/$$/fd/${fd} ]; do
fd=$((fd+1))
done
echo $fd
}
fd=$(lowest_unused_fd)
# Opening ~/.drive-google/logs/drive-google.log as file descriptor $fd for appending
eval "exec $fd>> ~/.drive-google/logs/drive-google.log"
fi
# Writing the trace output generated when set -x is enabled to file descriptor $fd
eval "BASH_XTRACEFD=$fd"
# Logging line numbers - We could also use ${0} for ${BASH_SOURCE}
BASH_SOURCE_BASENAME=$(basename ${BASH_SOURCE})
export PS4='${BASH_SOURCE_BASENAME}.${LINENO}+ '
# Expanding all variables and prints the full commands before output of the command
set -x
fi
year=$1
# Checking for no parameter or parameter beginning with '-'
if [[ ($# -eq 0) || ($year =~ ^-) ]]; then
end_of_help_message_line_number=$(awk '/^if \[\[ \$LOG_/{ print NR; exit }' /usr/bin/leap-year)
((end_of_help_message_line_number--))
awk -v var=$end_of_help_message_line_number 'NR >= 20 && NR <= var' /usr/bin/leap-year | zenity --text-info --title "leap-year help" --width 1150 --height 850
exit 1
else
if [[ $(($year % 4)) -ne 0 ]] ; then
# not a leap year
echo "false"
elif [[ $(($year % 400)) -eq 0 ]] ; then
# yes, it's a leap year
echo "true"
elif [[ $(($year % 100)) -eq 0 ]] ; then
# not a leap year
echo "false"
else
# yes, it's a leap year
echo "true"
fi
fi
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