up

#!/usr/bin/env bash

set -eu
set -o pipefail

: ${DOTFILES_PATH:="$HOME/.dotfiles"}
: ${DOTFILES_BRANCH:=master}

ARGS=('')
for a in "$@"; do
  ARGS=(${ARGS[@]} "$a")
done


#=== Utils
#==============================================================================================
compare_versions() {
  declare -a v1=(${1//./ })
  declare -a v2=(${2//./ })
  local i=""

  for (( i=${#v1[@]}; i<${#v2[@]}; i++ )); do
    v1[i]=0
  done

  for (( i=0; i<${#v1[@]}; i++ )); do
    if [[ -z ${v2[i]} ]]; then
      v2[i]=0
    fi

    if (( 10#${v1[i]} > 10#${v2[i]} )); then
      printf ">"
      return 0
    fi

    if (( 10#${v1[i]} < 10#${v2[i]} )); then
      printf "<"
      return 0
    fi
  done

  printf "="
}


#=== Steps
#==============================================================================================
print_header() {
  printf "\e[34m"
  echo '--------------------------------------------------------------------------------'
  echo '                                                                                '
  echo '          ██████╗  ██████╗ ████████╗███████╗██╗██╗     ███████╗███████╗         '
  echo '          ██╔══██╗██╔═══██╗╚══██╔══╝██╔════╝██║██║     ██╔════╝██╔════╝         '
  echo '          ██║  ██║██║   ██║   ██║   █████╗  ██║██║     █████╗  ███████╗         '
  echo '          ██║  ██║██║   ██║   ██║   ██╔══╝  ██║██║     ██╔══╝  ╚════██║         '
  echo '          ██████╔╝╚██████╔╝   ██║   ██║     ██║███████╗███████╗███████║         '
  echo '          ╚═════╝  ╚═════╝    ╚═╝   ╚═╝     ╚═╝╚══════╝╚══════╝╚══════╝         '
  echo '                                                                                '
  echo '                           There’s no place like ~/                             '
  echo '                                                                                '
  echo '                      github.com/probberechts/dotfiles                          '
  echo '                                                                                '
  echo '--------------------------------------------------------------------------------'
  printf "\e[0m\n"
}

check_os() {
  if [ "$(uname -s)" == "Darwin" ]; then
    if [ $(compare_versions "$(sw_vers -productVersion)" "10.9") == '<' ]; then
      echo "Sorry, this script is intended only for OS X 10.9.0+"
      exit 1
    fi
  else
    echo "Sorry, this script is intended only for OS X"
    exit 1
  fi
}

clone_or_update_repo() {
  local git_dir="$DOTFILES_PATH/.git"

  if [ -d "$git_dir" ]; then
    echo 'Updating repo...'

    if [ "$(git --git-dir="$git_dir" symbolic-ref --short HEAD 2> /dev/null)" != "master" ]; then
      echo 'skip (working on a non-master branch)'
      return
    fi

    if ! git --git-dir="$git_dir" diff --no-ext-diff --quiet --exit-code > /dev/null 2>&1; then
      echo 'skip (unstaged changes present)'
      return
    fi

    if ! git --git-dir="$git_dir" diff-index --cached --quiet HEAD -- > /dev/null 2>&1; then
      echo 'skip (uncommitted changes present)'
      return
    fi

    git --git-dir="$git_dir" pull origin master
    git --git-dir="$git_dir" submodule sync
    echo 'done'
  elif ! [ -d "$DOTFILES_PATH" ]; then
    echo 'Cloning repo...'
    git clone --recursive https://github.com/probberechts/dotfiles.git --branch $DOTFILES_BRANCH $DOTFILES_PATH
    echo 'done'
  fi
}

check_xcode_license_approved() {
  echo 'Agreeing to Xcode license...'

  local has_error=0

  if ! [[ "$(/usr/bin/xcrun clang 2>&1 || true)" =~ 'license' ]]; then
    echo 'skip (already approved)'
    return
  fi

  sudo expect -c '
    set timeout 3
    spawn xcodebuild -license

    expect {
      timeout { exit 2 }

      -exact "for more" {
        send "G"
        exp_continue
      }

      -exact "agree, print, cancel" {
        send "agree\n"
        exp_continue
      }

      -exact "You can view the license agreements" {
        exit 0
      }
    }
  ' > /dev/null || has_error=1

  [ $has_error -eq 1 ] && sudo xcodebuild -license

  echo 'done'
}

fix_permission() {
  [ -d $(brew --prefix) ] || mkdir -p $(brew --prefix)
  [ "$(brew --prefix | stat -f '%Su')" = "$(whoami)" ] && return  # GNU: stat -c '%U'

  echo 'Fixing permission of $(brew --prefix)...'
  sudo chown -R $(whoami) $(brew --prefix)/*
  echo 'done'
}

install_homebrew() {
  command -v 'brew' > /dev/null 2>&1 && return

  echo 'Installing homebrew...'
  /bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/HEAD/install.sh)" < /dev/null
  echo 'done'
}


#=== Entrypoint
#==============================================================================================

print_header
clone_or_update_repo
if [[ "$OSTYPE" == *'arwin'* ]]; then
  check_os
  check_xcode_license_approved
  fix_permission
  install_homebrew
  . $DOTFILES_PATH/bootstrap/mac
else
  . $DOTFILES_PATH/bootstrap/symlink
  . $DOTFILES_PATH/bootstrap/cleanup
fi