#!/usr/bin/env bash
set -e

if [ "$1" = "--debug" ]; then
  export RBENV_DEBUG=1
  shift
fi

if [ -n "$RBENV_DEBUG" ]; then
  # https://wiki-dev.bash-hackers.org/scripting/debuggingtips#making_xtrace_more_useful
  export PS4='+(${BASH_SOURCE}:${LINENO}): ${FUNCNAME[0]:+${FUNCNAME[0]}(): }'
  set -x
fi

abort() {
  { if [ "$#" -eq 0 ]; then cat -
    else echo "rbenv: $*"
    fi
  } >&2
  exit 1
}

if [ -z "${RBENV_ROOT}" ]; then
  RBENV_ROOT="${HOME}/.rbenv"
else
  RBENV_ROOT="${RBENV_ROOT%/}"
fi
export RBENV_ROOT

if [ -z "${RBENV_DIR}" ]; then
  RBENV_DIR="$PWD"
else
  [[ $RBENV_DIR == /* ]] || RBENV_DIR="$PWD/$RBENV_DIR"
  cd "$RBENV_DIR" 2>/dev/null || abort "cannot change working directory to \`$RBENV_DIR'"
  RBENV_DIR="$PWD"
  cd "$OLDPWD"
fi
export RBENV_DIR

[ -n "$RBENV_ORIG_PATH" ] || export RBENV_ORIG_PATH="$PATH"

shopt -s nullglob

rbenv_bin="${BASH_SOURCE:-$0}"
if [ -L "$rbenv_bin" ]; then
  # resolve rbenv symlink to find out where the actual libexec directory is
  if readlink="$(type -P greadlink)" || readlink="$(type -P readlink)"; then
    resolved="$("$readlink" "$rbenv_bin" 2>/dev/null)"
    if [[ $resolved == /* ]]; then
      libexec_dir="${resolved%/*}"
    else
      libexec_dir="$(cd "${rbenv_bin%/*}/${resolved%/*}" && pwd)"
    fi
  else
    # no readlink available; assume rbenv project layout
    libexec_dir="${rbenv_bin%/*}"
    if [[ $libexec_dir == */* ]]; then
      libexec_dir="${libexec_dir%/*}/libexec"
    else
      libexec_dir="${PWD}/libexec"
    fi
  fi
else
  libexec_dir="${rbenv_bin%/*}"
  [[ $libexec_dir != "." ]] || libexec_dir="$PWD"
fi

for plugin_bin in "${RBENV_ROOT}/plugins/"*/bin; do
  PATH="${plugin_bin}:${PATH}"
done
export PATH="${libexec_dir}:${PATH}"

RBENV_HOOK_PATH="${RBENV_HOOK_PATH}:${RBENV_ROOT}/rbenv.d"
if [ ! "${libexec_dir%/*}"/rbenv.d -ef "$RBENV_ROOT"/rbenv.d ]; then
  # Add rbenv's own `rbenv.d` unless rbenv was cloned to RBENV_ROOT
  RBENV_HOOK_PATH="${RBENV_HOOK_PATH}:${libexec_dir%/*}/rbenv.d"
fi
RBENV_HOOK_PATH="${RBENV_HOOK_PATH}:/usr/local/etc/rbenv.d:/etc/rbenv.d:/usr/lib/rbenv/hooks"
for plugin_hook in "${RBENV_ROOT}/plugins/"*/etc/rbenv.d; do
  RBENV_HOOK_PATH="${RBENV_HOOK_PATH}:${plugin_hook}"
done
RBENV_HOOK_PATH="${RBENV_HOOK_PATH#:}"
export RBENV_HOOK_PATH

shopt -u nullglob


command="$1"
case "$command" in
"" )
  { rbenv---version
    rbenv-help
  } | abort
  ;;
-v | --version )
  exec rbenv---version
  ;;
-h | --help )
  exec rbenv-help
  ;;
* )
  command_path="$(command -v "rbenv-$command" || true)"
  if [ -z "$command_path" ]; then
    if [ "$command" == "shell" ]; then
      abort "shell integration not enabled. Run \`rbenv init' for instructions."
    else
      abort "no such command \`$command'"
    fi
  fi

  shift 1
  if [ "$1" = --help ]; then
    if [[ "$command" == "sh-"* ]]; then
      echo "rbenv help \"$command\""
    else
      exec rbenv-help "$command"
    fi
  else
    exec "$command_path" "$@"
  fi
  ;;
esac