From a3a6db9ad40a71dbc92b644c220b849d225ef4a8 Mon Sep 17 00:00:00 2001
From: Isaac Freeman <memotype@gmail.com>
Date: Tue, 1 Sep 2026 02:38:21 -0400
Subject: [PATCH] Support callers with nounset enabled

---
 bj-1line.sh  |  2 +-
 bj-80-col.sh |  6 +++---
 bj-90-col.sh | 18 +++++++++---------
 bj.sh        |  2 ++
 test.sh      | 34 ++++++++++++++++++++++++++++++++++
 5 files changed, 49 insertions(+), 13 deletions(-)

diff --git a/bj-1line.sh b/bj-1line.sh
index acdc5e7..169b8e6 100755
--- a/bj-1line.sh
+++ b/bj-1line.sh
@@ -1,2 +1,2 @@
 # (C) Isaac Freeman (memotype@gmail.com). See https://github.com/memotype/bj.sh
-bj()([[ $1 = - ]]||exec<<<"$1";shift;c=;r(){ l=$c;IFS= read -rN1 c;};p(){ printf %s "${o[@]}";};s(){ p=$1;[[ $p ]]||o=();while r;do [[ $p&&! $q ]]&&o+=("$l");case $c in \\)r||break;[[ $p&&$q ]]||o+=("$l${c::!p}");;\")break;;*)[[ $p ]]||o+=("$c");;esac;done;};co(){ n= b=1;while r;do [[ $q ]]||o+=("$l");case $c in \")[[ $1||! $q ]]&&s 1||{ s;k=$(p);};;[|{)((b++));;]|\})((--b))||{ [[ $q ]]&&exit 1;o+=("$c");break;};;:)[[ $1$b = 1&&$q&&$k = "$q" ]]&&break;;,)((0$1&&b==1))&&[[ $q = $((++n)) ]]&&break;;esac;done;};for q in "$@" "";do shift&&[[ ! $q ]]&&return 2;x=0;o=();while r;do case $q$c in *[[:space:]])! :;;\")s;;[tfn0-9-])while o+=("$c")&&r&&[[ $c =~ [-+.0-9Ea-z] ]];do :;done;;*{)co;;*[)[[ $q = 0 ]]||co 1;;?)return 2;;*)return 1;;esac&&x=1&&break;done;done;p;((x));)
+bj()(set +u;[[ $1 = - ]]||exec<<<"$1";shift;c=;r(){ l=$c;IFS= read -rN1 c;};p(){ printf %s "${o[@]}";};s(){ p=$1;[[ $p ]]||o=();while r;do [[ $p&&! $q ]]&&o+=("$l");case $c in \\)r||break;[[ $p&&$q ]]||o+=("$l${c::!p}");;\")break;;*)[[ $p ]]||o+=("$c");;esac;done;};co(){ n= b=1;while r;do [[ $q ]]||o+=("$l");case $c in \")[[ $1||! $q ]]&&s 1||{ s;k=$(p);};;[|{)((b++));;]|\})((--b))||{ [[ $q ]]&&exit 1;o+=("$c");break;};;:)[[ $1$b = 1&&$q&&$k = "$q" ]]&&break;;,)((0$1&&b==1))&&[[ $q = $((++n)) ]]&&break;;esac;done;};for q in "$@" "";do shift&&[[ ! $q ]]&&return 2;x=0;o=();while r;do case $q$c in *[[:space:]])! :;;\")s;;[tfn0-9-])while o+=("$c")&&r&&[[ $c =~ [-+.0-9Ea-z] ]];do :;done;;*{)co;;*[)[[ $q = 0 ]]||co 1;;?)return 2;;*)return 1;;esac&&x=1&&break;done;done;p;((x));)
diff --git a/bj-80-col.sh b/bj-80-col.sh
index 0dea8ae..29f29c1 100755
--- a/bj-80-col.sh
+++ b/bj-80-col.sh
@@ -1,7 +1,7 @@
 # (C) Isaac Freeman (memotype@gmail.com). See https://github.com/memotype/bj.sh
-bj()([[ $1 = - ]]||exec<<<"$1";shift;c=;r(){ l=$c;IFS= read -rN1 c;};p(){ \
-printf %s "${o[@]}";};s(){ p=$1;[[ $p ]]||o=();while r;do [[ $p&&! $q ]]&&o+=(\
-"$l");case $c in \\)r||break;[[ $p&&$q ]]||o+=("$l${c::!p}");;\")break;;*)[[ \
+bj()(set +u;[[ $1 = - ]]||exec<<<"$1";shift;c=;r(){ l=$c;IFS= read -rN1 c;};p()\
+{ printf %s "${o[@]}";};s(){ p=$1;[[ $p ]]||o=();while r;do [[ $p&&! $q ]]&&o+=\
+("$l");case $c in \\)r||break;[[ $p&&$q ]]||o+=("$l${c::!p}");;\")break;;*)[[ \
 $p ]]||o+=("$c");;esac;done;};co(){ n= b=1;while r;do [[ $q ]]||o+=("$l");case \
 $c in \")[[ $1||! $q ]]&&s 1||{ s;k=$(p);};;[|{)((b++));;]|\})((--b))||{ [[ $q \
 ]]&&exit 1;o+=("$c");break;};;:)[[ $1$b = 1&&$q&&$k = "$q" ]]&&break;;,)((0$1&&
diff --git a/bj-90-col.sh b/bj-90-col.sh
index a587db9..66e8694 100755
--- a/bj-90-col.sh
+++ b/bj-90-col.sh
@@ -1,10 +1,10 @@
 # (C) Isaac Freeman (memotype@gmail.com). See https://github.com/memotype/bj.sh
-bj()([[ $1 = - ]]||exec<<<"$1";shift;c=;r(){ l=$c;IFS= read -rN1 c;};p(){ printf %s \
-"${o[@]}";};s(){ p=$1;[[ $p ]]||o=();while r;do [[ $p&&! $q ]]&&o+=("$l");case $c in \\)r\
-||break;[[ $p&&$q ]]||o+=("$l${c::!p}");;\")break;;*)[[ $p ]]||o+=("$c");;esac;done;};co\
-(){ n= b=1;while r;do [[ $q ]]||o+=("$l");case $c in \")[[ $1||! $q ]]&&s 1||{ s;k=$(p);}
-;;[|{)((b++));;]|\})((--b))||{ [[ $q ]]&&exit 1;o+=("$c");break;};;:)[[ $1$b = 1&&$q&&$k \
-= "$q" ]]&&break;;,)((0$1&&b==1))&&[[ $q = $((++n)) ]]&&break;;esac;done;};for q in "$@" \
-"";do shift&&[[ ! $q ]]&&return 2;x=0;o=();while r;do case $q$c in *[[:space:]])! :;;\")s
-;;[tfn0-9-])while o+=("$c")&&r&&[[ $c =~ [-+.0-9Ea-z] ]];do :;done;;*{)co;;*[)[[ $q = 0 \
-]]||co 1;;?)return 2;;*)return 1;;esac&&x=1&&break;done;done;p;((x));)
+bj()(set +u;[[ $1 = - ]]||exec<<<"$1";shift;c=;r(){ l=$c;IFS= read -rN1 c;};p(){ printf \
+%s "${o[@]}";};s(){ p=$1;[[ $p ]]||o=();while r;do [[ $p&&! $q ]]&&o+=("$l");case $c in \
+\\)r||break;[[ $p&&$q ]]||o+=("$l${c::!p}");;\")break;;*)[[ $p ]]||o+=("$c");;esac;done;}
+co(){ n= b=1;while r;do [[ $q ]]||o+=("$l");case $c in \")[[ $1||! $q ]]&&s 1||{ s;k=$(p)
+};;[|{)((b++));;]|\})((--b))||{ [[ $q ]]&&exit 1;o+=("$c");break;};;:)[[ $1$b = 1&&$q&&
+$k = "$q" ]]&&break;;,)((0$1&&b==1))&&[[ $q = $((++n)) ]]&&break;;esac;done;};for q in \
+"$@" "";do shift&&[[ ! $q ]]&&return 2;x=0;o=();while r;do case $q$c in *[[:space:]])! :;;
+\")s;;[tfn0-9-])while o+=("$c")&&r&&[[ $c =~ [-+.0-9Ea-z] ]];do :;done;;*{)co;;*[)[[ $q \
+= 0 ]]||co 1;;?)return 2;;*)return 1;;esac&&x=1&&break;done;done;p;((x));)
diff --git a/bj.sh b/bj.sh
index 2be0c7d..fc9e406 100755
--- a/bj.sh
+++ b/bj.sh
@@ -3,6 +3,8 @@
 # Copyright Isaac Freeman (memotype@gmail.com), licensed under the MIT license
 
 bj() (
+  set +u
+
   # If $1 is -, just read from stdin, otherwise we push $1 to stdin.
   # The JSON value is read as a stream of characters from stdin.
   [[ $1 = - ]] || exec <<<"$1"
diff --git a/test.sh b/test.sh
index b4dbe12..584af18 100755
--- a/test.sh
+++ b/test.sh
@@ -103,6 +103,40 @@ runstdin '[1,2]' '[1,2]'
 runstdin '{"a":1}' '{"a":1}'
 runstdin node-1 '{"metadata":{"name":"node-1"}}' metadata name
 
+# The parser must work when inherited shell options include nounset without
+# changing the caller's option state.
+echo "*** nounset caller: $src"
+bash -u /dev/stdin "$src" <<'EOF' \
+  || fail "$src failed with nounset enabled"
+src=$1
+. "$src"
+
+check() {
+  local expected=$1
+  shift
+  local c r
+  r=$(bj "$@")
+  c=$?
+  [[ $r = "$expected" && $c = 0 ]] || exit 1
+}
+
+json='{"object":{"string":"value","number":42,"true":true,"false":false,"null":null,"array":[0,{"nested":"hit"}]}}'
+check '{"string":"value","number":42,"true":true,"false":false,"null":null,"array":[0,{"nested":"hit"}]}' "$json" object
+check value "$json" object string
+check 42 "$json" object number
+check true "$json" object true
+check false "$json" object false
+check null "$json" object null
+check '[0,{"nested":"hit"}]' "$json" object array
+check hit "$json" object array 1 nested
+
+r=$(bj "$json" object missing)
+c=$?
+[[ -z $r && $c = 1 ]] || exit 1
+[[ $- = *u* ]] || exit 1
+EOF
+echo pass
+
 # Array out of bounds test
 runteststatus 1 '' '[0, 1, 2, 3]' 4