bootstrap

#!/usr/bin/env bash
#
# Install project dependencies (macOS and Linux only).

set -o errexit
set -o pipefail
set -o nounset

# shellcheck disable=SC1091
source utils.sh

readonly LOG_FILENAME=${LOG_FILENAME:-"$LOG_DIR/bootstrap.log"}
declare DETECTED_OS

welcome_user() {
  fancy_echo "Install project dependencies."
}

check_requirements() {
  # Output values of command uname -s
  local -r macos_uname_s='darwin'
  local -r linux_uname_s='linux'

  # Abort if uname binary not available
  if [ ! -x "$(command -v uname)" ]; then
    err_exit "Binary 'uname' not found. OS not supported"
  fi

  fancy_echo "Detecting OS (supported: Linux and macOS)"
  local -r detected_os_uppercase="$(uname -s)"

  # Downcase string
  # Source: https://stackoverflow.com/a/11392488
  readonly DETECTED_OS="$(echo "$detected_os_uppercase" | tr '[:upper:]' '[:lower:]')"

  # Abort script if OS is other than Linux or macOS (Darwin)
  if [ "$DETECTED_OS" != "$macos_uname_s" ] && [ "$DETECTED_OS" != "$linux_uname_s" ]; then
    err_exit "Detected OS $DETECTED_OS not supported. Supported: macOS (Darwin) and Linux"
  fi
}

install_virtual_env() {
  fancy_echo "Removing old python virtual environment 'neuralprocesses-venv'"
  rm -rf neuralprocesses-venv

  fancy_echo "Creating python virtual environment"
  python3 -m venv neuralprocesses-venv

  fancy_echo "Activating virtual environment"
  # Use parameter expansion to avoid exiting early if environment variable is unset due to errexit option.
  # Check that environment variable is not empty and corresponds to fish shell
  if [ -n "${SHELL+empty}" ] && grep --ignore-case --quiet 'fish' "$SHELL"; then
    fancy_echo "fish shell detected in SHELL env var. Activate virtual env using dedicated fish script:

source neuralprocesses-venv/bin/activate.fish"
  fi

  # shellcheck disable=SC1091
  source neuralprocesses-venv/bin/activate

  fancy_echo "Upgrading pip"
  python3 -m pip install --upgrade pip

  install_requirements
}

install_requirements() {
  local detected_os_filename="$DETECTED_OS"

  if [ "$DETECTED_OS" = 'darwin' ]; then
    detected_os_filename='mac'
    fancy_echo "Setting filename for $DETECTED_OS to $detected_os_filename"
  fi

  fancy_echo "Install requirements for $DETECTED_OS"

  fancy_echo "Installing requirements/$detected_os_filename.txt"
  python3 -m pip install --requirement "requirements/$detected_os_filename.txt"
}

main() {
  welcome_user
  check_requirements
  install_virtual_env
  summary
}

main "$@" 2>&1 | tee "$LOG_FILENAME"