#   This program is free software: you can redistribute it and/or modify
#   it under the terms of the GNU General Public License as published by
#   the Free Software Foundation, either version 3 of the License, or
#   (at your option) any later version.
#
#   This program is distributed in the hope that it will be useful,
#   but WITHOUT ANY WARRANTY; without even the implied warranty of
#   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#   GNU General Public License for more details.
#
#   You should have received a copy of the GNU General Public License
#   along with this program.  If not, see <http://www.gnu.org/licenses/>.
#
#
# various tests of unset when applied to variables at different local scopes
#
# function unsetting variable at previous local scope, uncovering global

inner()
{
    unset res
    echo ${FUNCNAME}: ${res-res unset}
    if [[ $1 == "set" ]]; then
        res[0]="X"
        res[1]="Y"
    fi
}

outer()
{
    local res=
    inner "$1"
    echo ${FUNCNAME}: "res: ${res[@]}"
}

echo main: ${res-unset}
outer set
echo main: after first call: ${res-unset}
outer dontset 
echo main: after second call: ${res-unset}

unset -f outer inner
unset res

# local scope, unset variable at the same scope as local declaration
func()
{
	typeset x=4

	unset x
	echo ${FUNCNAME}: ${x:-null or unset}
}

x=outside
func
echo after func: x = $x

unset -f func
unset x