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#!/usr/bin/env sh
set -e
usage() {
# shellcheck disable=SC2016
echo 'usage: nextbin [-v] "$0" "$@"' >&2
}
case "$1" in
-v) action="echo"; shift;;
-*|'') usage; exit 1;;
*) action="exec"
esac
orig_exe=$1
shift
die() {
fmt=$1
shift
printf "nextbin %s failed: $fmt\n" "$orig_exe" "$@" >&2
exit 1
}
[ / -ef / ] || exec bash "$0" "$orig_exe" "$@" || die "test -ef doesn't work, and bash not found"
[ -n "$PATH" ] || die 'PATH is empty'
exe_name=${orig_exe##*/}
path=$PATH
phase=1
found=
while :; do
exe=${path%%:*}/$exe_name
if [ -f "$exe" ] && [ -x "$exe" ]; then
if [ "$phase" = 1 ]; then
if [ "$exe" -ef "$orig_exe" ]; then
phase=2
fi
elif [ "$exe" -ef "$orig_exe" ]; then
[ -z "$found" ] || die 'duplicate PATH entries found'
elif [ -z "$found" ]; then
found=$exe
fi
fi
case $path in
*:*) path=${path#*:} ;;
*) break ;;
esac
done
if [ "$phase" = 1 ]; then
found=$(command -v "$exe_name") || die '%s is not in PATH' "$exe_name"
elif [ -z "$found" ]; then
die '%s is last instance' "$orig_exe"
fi
"$action" "$found" "$@"
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