#! /bin/bash
#
# is_installed - a script to find if a package
# is currently installed on Slackware and derivates

# var
SHOWHELP=69
E_NOPKGFOUND=70
E_NOARGS=71
PKGS_PATH="/var/log/packages"

PROG=$(basename $0)


# colors
RED='\033[1;31m'
ORANGE='\033[1;33m'
GREEN='\033[1;32m'
MAGENTA='\033[1;35m'
NC='\033[0m'

function search_file () {
	SEARCH=$1
	if [ -z $1 ]; then
		#we don't have a string to search
		echo -e "Usage: ${MAGENTA}$PROG ${NC}[file-search] ${GREEN}< filename >"
		echo -e "${RED}exiting${NC}"
		exit $E_NOARGS
	fi
	finding=$(grep -Hi "$SEARCH" ${PKGS_PATH}/*)
	if [[ ! -z $finding ]]; then
		old_IFS=$IFS
		IFS=$'\n'
		old_pkgname=""
		for line in $finding; do
			pkgname=$(echo $line | cut -d":" -f 1)
			match=$(echo $line | cut -d":" -f 2)
			if [[ $pkgname != $old_pkgname ]]; then
				echo -e "${ORANGE}$(basename $pkgname)${NC}"
			fi
			old_pkgname=$pkgname
			echo -en "\t${GREEN}$match${NC}\n"
		done
		IFS=${old_IFS}
	else
		echo -e "${ORANGE}no match for pattern ${GREEN}'$SEARCH' ${ORANGE}found"
		echo -e "${RED}exiting${NC}"
		exit $E_NOPKGFOUND
	fi
}

function search_package () {
	SEARCH=$1
	if [ -z $1 ]; then
		#we don't have a string to search
		echo -e "Usage: ${MAGENTA}$PROG ${GREEN}<filename>"
		echo -e "${RED}exiting${NC}"
		exit $E_NOARGS
	fi
	finding=$(/bin/ls -1 $PKGS_PATH |grep -i "$SEARCH")
	if [[ ! -z $finding ]]; then
		echo -en "${GREEN}$finding\n"
		echo -e "${NC}"
	else
		echo -e "${ORANGE}no package matching ${GREEN}'$SEARCH' ${ORANGE}found"
		echo -e "${RED}exiting${NC}"
		exit $E_NOPKGFOUND
	fi
}

function info () {
	SEARCH=$1
	if [ -z $1 ]; then
		#we don't have a string to search
		echo -e "Usage: ${MAGENTA}$PROG ${ORANGE}info ${GREEN}<filename>"
		echo -e "${RED}exiting${NC}"
		exit $E_NOARGS
	fi
	finding=$(/bin/ls -1 $PKGS_PATH |grep -i "$SEARCH")
	if [[ ! -z $finding ]]; then
		less $PKGS_PATH/$finding
	else
		echo -e "${ORANGE}no package matching ${GREEN}'$SEARCH' ${ORANGE}found"
		echo -e "${RED}exiting${NC}"
		exit $E_NOPKGFOUND
	fi
}

function help () {
	echo
	echo -e "${MAGENTA}$PROG${NC} -\tSearch for installed packages in the system"
	echo -e "\t\tand show which package contains a specific file."
	echo -e "${GREEN}USAGE:"
	echo -e "\t${MAGENTA}$PROG ${ORANGE}[ file-search ] [ help ] ${GREEN}< item >"
	echo -e "\t${MAGENTA}$PROG ${GREEN}<item>${NC} - Search between all installed packages for ${GREEN}item${NC}."
	echo -e "\t${MAGENTA}$PROG ${ORANGE}file-search ${GREEN}<item>${NC} - Search for ${GREEN}item${NC} inside every package installed."
	echo -e "\t${MAGENTA}$PROG ${ORANGE}help${NC} - Show this help and exit."
	echo -e "${NC}"
}
# controlla se vengono passati parametri
if [ -z $1 ]; then
	help
	exit $E_NOARGS
else
	case $1 in
		"file-search" )
			search_file $2
			;;
		"info" )
			info $2
			;;
		"help" )
			help
			exit $SHOWHELP
			;;
		* )
			search_package $1
			;;
	esac
fi


exit