set +o posix

quiet_safe_cd() {
  cd "$1" >/dev/null || { echo "Error: failed to cd to $1" >&2; exit 1; }
}

absdir() {
  quiet_safe_cd "${1%/*}/" && pwd -P
}

dirbasepath() {
  local dir="$1"
  local base="${2##*/}"
  echo "$dir/$base"
}

realpath() {
  local path="$1"
  local dir
  local dest

  dir="$(absdir "$path")"
  path="$(dirbasepath "$dir" "$path")"

  while [[ -L "$path" ]]
  do
    dest="$(readlink "$path")"
    if [[ "$dest" = "/"* ]]
    then
      path="$dest"
    else
      path="$dir/$dest"
    fi
    dir="$(absdir "$path")"
    path="$(dirbasepath "$dir" "$path")"
  done

  echo "$path"
}

executable() {
  local file="$1"
  [[ -f "$file" && -x "$file" ]]
}

lowercase() {
  echo "$1" | tr "[:upper:]" "[:lower:]"
}

safe_exec() {
  local arg0="$1"
  if ! executable "$arg0"
  then
    return
  fi
  # prevent fork-bombs
  if [[ "$(lowercase "$arg0")" = "$SHIM_FILE" || "$(realpath "$arg0")" = "$SHIM_REAL" ]]
  then
    return
  fi
  if [[ "$HOMEBREW" = "print-path" ]]
  then
    local dir="$(quiet_safe_cd "${arg0%/*}/" && pwd)"
    local path="$(dirbasepath "$dir" "$arg0")"
    echo "$path"
    exit
  fi
  exec "$@"
}

try_exec_non_system() {
	local file="$1"
  shift

	IFS=$'\n'
	for path in $(type -aP "$file")
	do
	  if [[ "$path" != "/usr/bin/$file" ]]
	  then
	    safe_exec "$path" "$@"
	  fi
	done
	unset IFS
}


SHIM_FILE="${0##*/}"
SHIM_REAL="$(realpath "$0")"

if [[ "$1" = --homebrew=* ]]
then
  HOMEBREW="${1:11}"
  shift
fi