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#! /bin/bash
#This script creates two kind of txt file
#depending on parameter passed to the script
#and on the BACKUP directory you choose. (default is the one in which you put this script)
#Feel free to write your favorite directory in the line below,
#possibly withtout the ending /
BACKUP=

#Txt file created are
#an historcal list of sorted and univocally occurring bash commands
#and a list of installed packages.
#Txt file name is univocally determinated by date

#FURTHER DEVELOPMENTS
#LANGUAGE recognition
#commands tab-completion
#... others :)

LANGUAGE=$LANG
LANGUAGE=${LANGUAGE:-"it_IT.utf8"}
BACKUP=${BACKUP:-$(dirname `readlink -f $0`)}


if ! [ -w "${BACKUP}" ]; then
	echo -e "$BACKUP: Permesso negato"
	exit 1
fi

ARGV=("$@")
AVAILABLE_OPTIONS=("-packages" "--remove-list" "-history" "--merge-history" "--merge-all" "--remove-history")

#PACKAGESFILE=`find ${BACKUP} -maxdepth 1 -name "my-packages*txt" | sort | tail -n 1`
HISTORYFILE=`find ${BACKUP} -maxdepth 1 -name "sortedUniqHistory*txt" | sort | tail -n 1`
#echo ${HISTORYFILE}

#date in file name compatible format
DATA=`date +%F-%R:%S`

function contains() {
	local n=$#
	local value=${!n}
	for ((i=1;i < $#;i++)) {
		if [ "${!i}" == "${value}" ]; then
		return 0
		fi
	}
	return 1
}

function Usage() {
	echo -e "\nSYNOPSIS\n"
	echo -e "\t$0 \n\t[ -packages | --remove-list ] \n\t[ -history | --merge-history | --merge-all | --remove-history ]\n"
	echo -e "DESCRIPTION\n"
	echo -e "-packages:\n\tViene creato in\n\t${BACKUP}\n\tun file contenente tutti i pacchetti installati.\n"
	echo -e "--remove-list:\n\tVengono eliminati i file my-packages presenti in\n\t${BACKUP}.\n\tViene poi creato un nuovo file my-packages.\n"
	echo -e "-history:\n\tViene creato in\n\t${BACKUP}\n\tun file con il contenuto di\n\t$HOME/bash_history.\n\tTale contenuto è elaborato in modo che\n\tsia in ordine alfabetico\n\te ogni comando compaia una volta.\n"
	echo -e "--merge-history:\n\tCome -history,\n\tma il file creato viene unito al più recente trovato in\n\t${BACKUP}.\n\tIn caso non venga trovato un file recente,\n\tnon viene elaborato nessun file.\n"
	echo -e "--merge-all:\n\tCome -history,\n\tma il file creato viene unito a tutti quelli trovati in\n\t${BACKUP}.\n"
	echo -e "--remove-history:\n\tRimuove tutti i file con lo storico dei comandi,\n\tcontenuti in ${BACKUP},\n\tescluso il più recente.\n"
	exit 1
}

if [ $# = 0 ]; then
	echo -e "Usare «$0 --help» per ulteriori informazioni."
	exit 1
elif [ $# = 1 ] && [ ${ARGV[0]} = --help ]; then
	Usage
fi

wrong_option_flag=1
for item in ${ARGV[@]}; do
	if ! contains "${AVAILABLE_OPTIONS[@]}" "${item}"; then
		echo -e "$0": opzione non riconosciuta \"${item}\"
		wrong_option_flag=0
	fi
done

if [ ${wrong_option_flag} = 0 ] ; then
	echo -e "Usare «$0 --help» per ulteriori informazioni."
	exit 1
fi



#--remove-list:
#if writing permission is granted, al my-pachages file in $BACKUP dir
#will be removed
#otherwise, a warning will be printed
#and then... a new my-packages file will be created
if contains "${ARGV[@]}" "--remove-list"; then
	if contains "${ARGV[@]}" "-packages"; then
		echo -e "Usare «$0 --help» per ulteriori informazioni."
	else
		for item in `find ${BACKUP} -maxdepth 1 -name "my-packages*txt"`; do
			if [ -w "${item}" ]; then
				rm "${item}"
			elif ! [ -w "${item}" ]; then
				echo "${item}: Permesso negato"
			fi
		done
		dpkg --get-selections > ${BACKUP}/my-packages`echo -$DATA`.txt
	fi
#-packages:
#if an already existing file is finded in $BACKUP a warning is printed
#otherwise, a my-packages file is created
elif contains "${ARGV[@]}" "-packages"; then
	if [ -e ${BACKUP}/my-packages`echo -$DATA`.txt ]; then
		echo -e "${BACKUP}/my-packages`echo -$DATA`.txt": file esistente
	else
	dpkg --get-selections > ${BACKUP}/my-packages`echo -$DATA`.txt
	fi
fi

#-history:
#if an already existing file is finded in $BACKUP, a warning is printed
#an
if contains "${ARGV[@]}" "-history"; then
	if contains "${ARGV[@]}" "--merge-history" || contains "${ARGV[@]}" "--remove-history" || contains "${ARGV[@]}" "--merge-all"; then
		echo -e "Usare «$0 --help» per ulteriori informazioni."
	else
		if ! [ -e ${BACKUP}/sortedUniqHistory`echo -$DATA`.txt ]; then
			cat ${HOME}/.bash_history | sort | uniq > ${BACKUP}/sortedUniqHistory`echo -$DATA`.txt
		elif ! [ -w ${BACKUP}/sortedUniqHistory`echo -$DATA`.txt ]; then
			echo "${BACKUP}/sortedUniqHistory`echo -$DATA`.txt: permesso in scrittura negato"
		elif [ -w ${BACKUP}/sortedUniqHistory`echo -$DATA`.txt ]; then
			echo -e "${BACKUP}/sortedUniqHistory`echo -$DATA`.txt": file esistente
			echo -n "Procedere comunque, sovrascrivendo il file? (y/n): "
			read risposta
			case ${risposta} in
			y)
				cat ${HOME}/.bash_history | sort | uniq > ${BACKUP}/sortedUniqHistory`echo -$DATA`.txt
				;;
			*)
				;;
			esac
		fi
	fi
elif contains "${ARGV[@]}" "--merge-history"; then
	if contains "${ARGV[@]}" "--remove-history" || contains "${ARGV[@]}" "--merge-all"; then
		echo -e "Usare «$0 --help» per ulteriori informazioni."
	elif ! [ -e "${HISTORYFILE}" ]; then
		echo -e "Non è stato trovato un file da fondere"
	elif [ "${HISTORYFILE}" = ${BACKUP}/sortedUniqHistory`echo -$DATA`.txt ]; then
		echo -e "${HISTORYFILE}": file di destinazione esistente
	elif  ! [ -r "${HISTORYFILE}" ]; then
		echo -e "${HISTORYFILE}: Permesso in lettura negato"
	elif [ -r "${HISTORYFILE}" ]; then
		cat ${HISTORYFILE} ${HOME}/.bash_history | sort | uniq >> ${BACKUP}/sortedUniqHistory`echo -$DATA`.txt
	fi
elif contains "${ARGV[@]}" "--remove-history"; then
	if contains "${ARGV[@]}" "--merge-all"; then
		echo -e "Usare «$0 --help» per ulteriori informazioni."
	else
		for item in `find ${BACKUP} -maxdepth 1 -name "sortedUniqHistory*txt"`; do
			if [ "${item}" != "${HISTORYFILE}" ]; then
				if [ -w "${item}" ]; then
					rm "${item}"
				elif ! [ -w "${item}" ]; then
					echo "${item}: Permesso negato"
				fi
			else
				echo "${item}: file più recente, non verrà cancellato"
			fi
		done
	fi
elif contains "${ARGV[@]}" "--merge-all"; then
	output="${BACKUP}/sortedUniqHistory`echo -$DATA`.txt"
	if [ -e "${output}" ]; then
		echo "${BACKUP}/sortedUniqHistory`echo -$DATA`.txt": file di destinazione esistente
	elif ! [ -e "${output}" ]; then
		cat `find ${BACKUP} -maxdepth 1 -name "sortedUniqHistory*txt"` ${HOME}/.bash_history | sort | uniq > "${output}"
		#echo `find ${BACKUP} -maxdepth 1 -name "sortedUniqHistory*txt" | wc -l`
		if [ `find ${BACKUP} -maxdepth 1 -name "sortedUniqHistory*txt" | wc -l` -gt 1 ]; then
			echo -n "Si desidera eliminare i file elaborati? (y/n):"
			read risposta
			case "${risposta}" in
			y)
				for item in `find ${BACKUP} -maxdepth 1 -name "sortedUniqHistory*txt"`; do
					if [ "${item}" != "${output}" ]; then
						if [ -w "${item}" ]; then
							rm "${item}"
						elif ! [ -w "${item}" ]; then
							echo "${item}: permesso negato"
						fi
					fi
				done
				;;
			*)
				;;
			esac
		fi
	fi
fi

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./nomescript.sh --help

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function Usage() {
    cat <<EOF

SYNOPSIS

	$0 
	[ -packages | --remove-list ] 
	[ -history | --merge-history | --merge-all | --remove-history ]

DESCRIPTION

-packages:
	Viene creato in
	${BACKUP}
	un file contenente tutti i pacchetti installati.

--remove-list:
	Vengono eliminati i file my-packages presenti in
	${BACKUP}.
	Viene poi creato un nuovo file my-packages.

-history:
	Viene creato in
	${BACKUP}
	un file con il contenuto di
	$HOME/bash_history.
	Tale contenuto è elaborato in modo che
	sia in ordine alfabetico
	e ogni comando compaia una volta.

--merge-history:
	Come -history,
	ma il file creato viene unito al più recente trovato in
	${BACKUP}.
	In caso non venga trovato un file recente,
	non viene elaborato nessun file.

--merge-all:
	Come -history,
	ma il file creato viene unito a tutti quelli trovati in
	${BACKUP}.

--remove-history:
	Rimuove tutti i file con lo storico dei comandi,
	contenuti in ${BACKUP},
	escluso il più recente.
EOF
    exit 1
}

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$ type getopts 
getopts è un builtin di shell

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l3on4rdo@l3on4rdo-laptop:~$ type getopt
getopt è /usr/bin/getopt