bootstrap

#!/usr/bin/env bash

set -euo pipefail

command_exists() {
  type -f "$1" >/dev/null 2>&1
}

ensure() {
  COMMAND="$1"
  shift
  if [ "$#" -ge 1 ]
  then
    PACKAGES=("$@")
  else
    PACKAGES=("$COMMAND")
  fi
  if ! command_exists "$COMMAND"
  then
    "${INSTALLER[@]}" "${PACKAGES[@]}"
  fi
}

sudo_() {
  if [ "$EUID" -eq 0 ]
  then
    "$@"
  else
    sudo "$@"
  fi
}

case "$OSTYPE" in
  darwin*)
    brew_env() {
      if [ -d /opt/homebrew ]
      then
        eval "$(/opt/homebrew/bin/brew shellenv)"
      fi
    }
    brew_env

    if ! command_exists brew
    then
      /bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/HEAD/install.sh)"
      brew_env
    fi

    INSTALLER=(brew install)

    # macOS has Python 3, but it's too old
    if ! command_exists python3 || type python3 | grep -q /usr/bin/python3
    then
      "${INSTALLER[@]}" python@3
    fi
    ;;
  linux*)
    DISTRO=$(grep '^ID=' /etc/os-release | cut -d = -f 2)

    case $DISTRO in
      debian|ubuntu)
        INSTALLER=(sudo_ apt install --yes)
        if [ -z "$(ls -A /var/lib/apt/lists)" ]
        then
          sudo_ apt update
        fi
        ;;
      fedora)
        INSTALLER=(sudo_ dnf install --assumeyes)
        ;;
    esac

    ensure curl
    ensure git
    ensure sudo

    case $DISTRO in
      debian|ubuntu)
        ensure python3 python3{,-venv}
        ;;
    esac
    ;;
esac

PIPX=/usr/local/bin/pipx
if ! [ -f "$PIPX" ]
then
  sudo_ touch -t 200001010000 "$PIPX"
fi

PIPX_TEMP=$(mktemp)
trap 'rm -f "$PIPX_TEMP"' EXIT
curl -sSL https://github.com/pypa/pipx/releases/latest/download/pipx.pyz -z "$PIPX" -o "$PIPX_TEMP"
if [ -s "$PIPX_TEMP" ]
then
  sudo_ mv "$PIPX_TEMP" "$PIPX"
  sudo_ chmod +rx "$PIPX"
fi

if [ "${1:-}" != "--development" ]
then
  pipx upgrade --install mybox
fi