mac

#!/usr/bin/env bash
#
# CLI to perform macOS common tasks.

usage() {
  cat <<- EOF
Usage: mac [OPTIONS]

  Easily perform macOS common tasks.

Available mac commands:

* Apps:
  close-all-apps    Close all opened apps except Finder, iTerm, and Dropbox

* System:
  info              Show macOS version information
  lock              Lock screen and launch screen saver
  empty-trash       Empty trash
  update            Install macOS software updates, Homebrew and installed formulas,
                    Vim and its plugins, Solarized repositories, and dotfiles submodules

* WI-FI:
  check-internet    Test network connectivity
  ip                Show local and public IP addresses
  wifi-history      List Previously Used Wi-Fi Networks
EOF
}

#-------------------------------------
# Apps
#-------------------------------------
close_all_apps() {
  whitelist="grep\|iTerm\|Finder\|Dropbox"
  ps aux             |
  grep /Applications |
  grep -v $whitelist |
  sed "s/\ *\ /\ /g" |
  cut -d ' ' -f 2    |
  xargs -I X kill -9 X
}

#-------------------------------------
# System
#-------------------------------------
empty_trash() {
  rm -rf ~/.Trash/*
}

launch_screen_saver() {
  open /System/Library/Frameworks/ScreenSaver.framework/Versions/A/Resources/ScreenSaverEngine.app
}

#-------------------------------------
# WI-FI
#-------------------------------------
show_ip_address() {
  # shellcheck disable=SC2155
  local external_ip_addr="$(dig +short myip.opendns.com @resolver1.opendns.com)"
  # shellcheck disable=SC2155
  local local_ip_addr="$(ipconfig getifaddr en0)"

  printf "Local IP Address:    %s\n" "$local_ip_addr"
  printf "External IP Address: %s\n" "$external_ip_addr"
}

show_wifi_history() {
  defaults read /Library/Preferences/SystemConfiguration/com.apple.airport.preferences |
  grep LastConnected -A 7 |
  less
}

test_network_connectivity() {
  ping -o google.com
}

#-------------------------------------
# Main
#-------------------------------------
main() {
  case $1 in
    help )
      usage
      exit
      ;;

    #-------------------------------------
    # Apps
    #-------------------------------------
    close-all-apps ) close_all_apps ;;

    #-------------------------------------
    # System
    #-------------------------------------
    empty-trash ) empty_trash ;;
    info        ) sw_vers ;;
    lock        ) launch_screen_saver ;;
    update      ) update-system ;;

    #-------------------------------------
    # WI-FI
    #-------------------------------------
    check-internet ) test_network_connectivity ;;
    ip             ) show_ip_address ;;
    wifi-history   ) show_wifi_history ;;

    #-------------------------------------
    # Unknown
    #-------------------------------------
    * )
      echo "mac: '$1' is not a mac command. See 'mac help'."
      exit 1
      ;;
  esac
}

main "$@"