#!/bin/sh

THIS=$1

ASH="ash -s"
BASH="bash --posix -s"
DASH="dash -s"
KSH="ksh -s"
POSH="posh -s"
ZSH="zsh -s"

ERROR=""

wrapper () {
    $SH -- "$@" <<-'EOF'
### common.sh

outfile=
while getopts o: opt; do
    case $opt in
    o) outfile="$OPTARG" ;;
    esac
done

shift $(($OPTIND - 1))

### postopts.sh

echo "Options passed to wrapper:"
[ -z "$outfile" ] || echo "|$outfile|"

echo "Arguments passed to wrapper:"
for arg; do
    echo "|$arg|"
done

pandoc () {
    echo "Arguments passed to wrappee:"
    for arg; do
        echo "|$arg|"
    done
}
runpandoc
EOF
}

# Portable which(1).
pathfind () {
    oldifs="$IFS"; IFS=':'
    for _p in $PATH; do
        if [ -x "$_p/$*" ] && [ -f "$_p/$*" ]; then
            IFS="$oldifs"
            return 0
        fi
    done
    IFS="$oldifs"
    return 1
}

check_results () {
        if [ "$1" = "$2" ]; then
            echo >&2 ok
            return 0
        else
            echo >&2 failed
            sed "s/^/\t/" >&2 <<EOF
Command line: '$3'
===> Expected:
$2
<=== Got:
$1
EOF
            return 1
        fi
}

for SH in "$BASH" "$DASH" "$KSH" "$ZSH"; do
    CMD=${SH%% *}
    echo >&2 "  Testing with $CMD..."
    if pathfind "$CMD"; then
        if [ "$CMD" = "zsh" ]; then
            # Zsh needs to be called as 'sh' to enable POSIX mode.
            ln -s $(which zsh) ./sh
            SH="./sh ${SH#* }"
            trap 'err=$?; rm -f ./sh; exit $err' 0 1 2 3 13 15
        fi

        set -e

        # Test 1
        printf >&2 "    test case 1... "
        actual=$(wrapper -o "output file" "foo bar" -A "quux baz" -B)
        expected=$(cat <<'EOF'
Options passed to wrapper:
|output file|
Arguments passed to wrapper:
|foo bar|
Arguments passed to wrappee:
|-A|
|quux baz|
|-B|
EOF
)
        check_results "$actual" "$expected" \
            'wrapper -o "output file" "foo bar" -A "quux baz" -B'

        # Test 2
        printf >&2 "    test case 2... "
        actual=$(wrapper -- -A "foo bar")
        expected=$(cat <<'EOF'
Options passed to wrapper:
Arguments passed to wrapper:
Arguments passed to wrappee:
|-A|
|foo bar|
EOF
)
        check_results "$actual" "$expected" 'wrapper -- -A "foo bar"'

        # Test 3 (Test 1 with a redundant '--')
        printf >&2 "    test case 3... "
        actual=$(wrapper -o "output file" "foo bar" -- -A "quux baz" -B)
        expected=$(cat <<'EOF'
Options passed to wrapper:
|output file|
Arguments passed to wrapper:
|foo bar|
Arguments passed to wrappee:
|-A|
|quux baz|
|-B|
EOF
)
        check_results "$actual" "$expected" \
            'wrapper -o "output file" "foo bar" -- -A "quux baz" -B'
    else
        echo >&2 "Warning: cannot verify correctness with $CMD; shell not available"
    fi
done

exit 0