# -*- sh -*-

# Defines dbg_echo (and others?) as either noops or useful functions
# if DBG_ALL or DBG_$script are defined as non-empty strings.  

# shell resource for debugging, must be sourced (dotted) into user
# scripts.

# convert $path-to/foo-bar.* into foo_bar
script=`basename $0 | sed -e 's/\.\w*//' | sed -e 's/-/_/g' `

# auto-export DBG_* vars passed on cmdline
export ${!DBG_*}
if [ -n $VDBG ] ; then
    for n in ${!DBG_*}; do
	echo "exported $n=${!n}"
    done
fi

# and get envar name which would enable $script debugging
DBG_ME=DBG_$script

# define shell functions accordingly
if [ -z "$DBG_ALL" -a -z "${!DBG_ME}" ] ; then

    # noop shell functions

    function dbg_echo() {
	: NO-OP
    }
    function dbg_echo_v() {
	: NO-OP
    }
    # insert other noop funcs here

    return;	# only allowed in func or sourced scripts
fi

# define useful shell functions

dbg_echo() {
    echo "$script: $*"
}

dbg_echo_v() {
    let lvl=$1
    shift 1
    if (( $DBG_ME >= $lvl )) ; then
    echo "$script: $*"
    fi
}