install_sfml

#/bin/bash

# This script installs SFML. It detects whether the user is
# running Linux or macOS.

# _log prints its first argument to the standard output, if the
# global variable verbose is set to true. If it is false, it does
# nothing.
_log() {
  if [ $verbose = true ]; then
    printf "$1"
  fi
}

### Actual beginning.

set -e

verbose=false
if [[ "$1" = "-v" || "$1" = "--verbose" ]]; then
  verbose=true
fi

if [ -d "sfml" ]; then
  printf "install_sfml: sfml directory already exists\n"
  exit 1
else
  printf "install_sfml: creating sfml directory..."
  mkdir sfml
  printf "ok\n"
fi


download_url="null"
case "$(uname -s)" in
  Linux*)
    download_url="https://www.sfml-dev.org/files/SFML-2.5.1-linux-gcc-64-bit.tar.gz"
    _log "install_sfml: detected Linux host\n"
  ;;
  Darwin*)
    download_url="https://www.sfml-dev.org/files/SFML-2.5.1-macOS-clang.tar.gz"
    _log "install_sfml: detected macOS host\n"
  ;;
  *)
    printf "install_sfml: error: unknown operating system\n"
    exit 1
  ;;
esac

_log "install_sfml: downloading SFML..."
curl -Ss "$download_url" > sfml.tar.gz
_log "ok\n"

_log "install_sfml: extracting SFML..."
tar -xzf sfml.tar.gz --strip-components 1 -C sfml
_log "ok\n"

rm sfml.tar.gz

printf "install_sfml: done\n"