#!/usr/bin/env bash

#

# @license Apache-2.0

#

# Copyright (c) 2017 The Stdlib Authors.

#

# Licensed under the Apache License, Version 2.0 (the "License");

# you may not use this file except in compliance with the License.

# You may obtain a copy of the License at

#

# http://www.apache.org/licenses/LICENSE-2.0

#

# Unless required by applicable law or agreed to in writing, software

# distributed under the License is distributed on an "AS IS" BASIS,

# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

# See the License for the specific language governing permissions and

# limitations under the License.

# Check whether Rscript is installed.

#

# Usage: check_rscript

#

# VARIABLES #

# Find Rscript:

RSCRIPT=$(command -v Rscript 2>/dev/null)

# MAIN #

if [[ -x "${RSCRIPT}" ]] && "${RSCRIPT}" --version >/dev/null; then

echo 'Rscript is installed.' >&2

exit 0

else

echo 'ERROR: missing dependency. Please download R version >= 3.3.3 (https://www.r-project.org/). Once installed, run the command again.' >&2

exit 1

fi

# TODO: check for minimum version