#   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/>.
#

# Change bash to expand the next word following aliases ending with a space
# that are more than one level deep. Change how bash handles the expand-next-word
# flag when recognizing a reserved word.
#
# Bash never did this before post-bash-5.2

: ${THIS_SH:=./bash}

shopt -s expand_aliases 2>/dev/null

alias a1='echo '
alias a2=a1

alias foo=bar
alias x=xtra

a2 foo
unalias foo

alias e='echo '
alias f='foo '
alias b=bar

e f b x

alias e=echo

a2 foo;e x

unalias e f b

alias e=echo
alias foo='bar '
alias c=';'

a2 foo c e x

unalias foo e c

alias file='/dev/null ;'
alias e=echo
alias foo='bar '
alias c='< '
alias x=xtra
a2 foo c file e x

unalias a1 a2 e foo c x file

alias foo=bar

alias al=' '
alias foo=bar

al for foo in v
do echo foo=$foo bar=$bar
done

al case foo in foo) echo foo;; bar) echo bar;; esac

# one difference between bash in default and posix modes is that default mode
# bash allows reserved words to be aliased, which posix says is a no-no

${THIS_SH} -c '
shopt -s expand_aliases 2>/dev/null
alias al=" "
alias foo=bar
alias for=echo
al for foo in v
do echo foo=$foo bar=$bar
done' bash

${THIS_SH} -o posix -c '
alias al=" "
alias foo=bar
alias for=echo
al for foo in v
do echo foo=$foo bar=$bar
done' bash