delcore.sht

#%shebang
#%version 5
#
# Delete core files
#

#%prolog

################

#%include sys/cmd
#%include sys/config
#%include sys/msg
#%include sys/pathabs
#%include sys/vars

################

# Print usage information
usage ()
{
    cat << EOF
Usage: ${PROG} [-c config] [-d dir]...
EOF
}

# Print help information
usage_help ()
{
    usage
    cat << EOF

    Find and delete files named 'core' in specified directories

    -c config	Configuration file
    -d dir	Directory for processing. This option can be used multiple
		times (-d dir1 -d dir2) or several directories can be listed
		separated by colon (-d dir1:dir2).
EOF
    exit 0
}

####

# Parse command line options
get_options ()
{
    local _opt=""

    case "$1" in ( '-?' | '-help' | '--help' ) usage_help ;; esac
    while getopts ":c:d:" _opt ; do
	case "${_opt}" in
	    ( 'c' ) OPT_CONF_FILE="$(absolute_path "${OPTARG}")" ;;
	    ( 'd' ) OPT_DELCORE_DIRS="${OPT_DELCORE_DIRS:+${OPT_DELCORE_DIRS}:}${OPTARG}" ;;
	    ( ':' )
		err "missing argument for option -- '${OPTARG}'"
		usage ; return 1 ;;
	    ( '?' )
		err "unknown option -- '${OPTARG}'"
		usage ; return 1 ;;
	    (  *  )
		err "no handler for option '${_opt}'"
		return 1 ;;
	esac
    done
    shift $((${OPTIND} - 1))
    if test $# -ne 0 ; then
	err "too many arguments"
	usage
	return 1
    fi
}

####

# Delete core files
delcore ()
{
    local _dir=""
    local _ifs=""

    if test -n "${DELCORE_DIRS}" ; then
	_ifs="${IFS}" ; IFS=":"		# Save IFS and set to ':'
	for _dir in ${DELCORE_DIRS} ; do
	    if test -d "${_dir}" ; then
		cmd find -H "${_dir}" -xdev -type f -name "core" -exec rm -f {} \+
	    fi
	done
	IFS="${_ifs}"			# Restore IFS
    fi
}

####

# Initialization subroutine
init ()
{
    # Initialize variables
    var_init DELCORE_DIRS	&&
    # Set up configuration file variables
    var_init CONF_FILE		&&
    DEF_CONF_FILE="spxshell/delcore.conf"	&&
    # Get options
    get_options "$@"		&&
    # Read configuration file
    var_set  CONF_FILE		&&
    read_config "${CONF_FILE}"	&&
    # Set variables
    var_set  DELCORE_DIRS
}

# Exit with error code
fail ()
{
    exit "${1:-1}"
}

####

# Main subroutine
main ()
{
    init "$@" && delcore || fail
}

# Call main subroutine
main "$@"