#   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/>.
#
# address issues with patsub_replacement, quoting `&', and BASH_COMPAT <= 42

# unquoted pattern substitutions with unquoted pattern and replacement strings
# will still perform matching and replacement even if BASH_COMPAT == 42

s="a < b"

echo unquoted word expansion with quoted pattern and replacement
echo '4.2: 4.2, a &lt; b'
for ver in 4.2 5.2; do
  BASH_COMPAT=$ver # ignored for bash version less than 5.0
  t=${s//'<'/'&lt;'}
  echo "${BASH_VERSINFO[0]}.${BASH_VERSINFO[1]}: $BASH_COMPAT, $t"
done

echo double-quoted word expansion with quoted pattern and replacement
echo "4.2: 4.2, a '&lt;' b"
for ver in 4.2 5.2; do
  BASH_COMPAT=$ver # ignored for bash version less than 5.0
  t="${s//'<'/'&lt;'}"
  echo "${BASH_VERSINFO[0]}.${BASH_VERSINFO[1]}: $BASH_COMPAT, $t"
done

echo unquoted word expansion with unquoted pattern and replacement
echo '4.2: 4.2, a &lt; b'
for ver in 4.2 5.2; do
  BASH_COMPAT=$ver # ignored for bash version less than 5.0
  t=${s//</&lt;}
  echo "${BASH_VERSINFO[0]}.${BASH_VERSINFO[1]}: $BASH_COMPAT, $t"
done

# XXX - this is iffy but difficult to distinguish internally
echo double-quoted word expansion with unquoted pattern and replacement
echo '4.2: 4.2, a &lt; b'
for ver in 4.2 5.2; do
  BASH_COMPAT=$ver # ignored for bash version less than 5.0
  t="${s//</&lt;}"
  echo "${BASH_VERSINFO[0]}.${BASH_VERSINFO[1]}: $BASH_COMPAT, $t"
done

echo unquoted word expansion with backslash-quoted '&'
echo '4.2: 4.2, a &lt; b'
for ver in 4.2 5.2; do
  BASH_COMPAT=$ver # ignored for bash version less than 5.0
  t=${s//</\&lt;}
  echo "${BASH_VERSINFO[0]}.${BASH_VERSINFO[1]}: $BASH_COMPAT, $t"
done

echo double-quoted word expansion with backslash-quoted '&'
echo '4.2: 4.2, a \&lt; b'
for ver in 4.2 5.2; do
  BASH_COMPAT=$ver # ignored for bash version less than 5.0
  t="${s//</\&lt;}"
  echo "${BASH_VERSINFO[0]}.${BASH_VERSINFO[1]}: $BASH_COMPAT, $t"
done