dx

#!/bin/bash
# name: dx
# author: Wil Hall
# email: wil@wilhall.com

READBACK=true

usage()
{
cat << EOF
usage: $(basename $0)  

This utility performs backups and restorations of macOS user defaults.
Backups are managed in '~/.defaults/'.

OPTIONS:
   -h | --help        Show this message
   -r | --restore     <DOMAIN> The domain to restore
   -R | --restore-all Restore all domains that have backups
   -b | --backup      <DOMAIN> The domain to back up
   -B | --backup-all  Back up all domains that already have backups

<DOMAIN> is one of:
-globalDomain  The macOS global domain
<DOMAIN_NAME>  The fully-qualified domain name (e.g. application bundle identifier)
<APP_NAME>     The application name (e.g. '/Applications/<APP_NAME>.app'

EOF
}

resolve_domain() {
  if [[ "$1" == *'.'* ]] || [[ "$1" == '-globalDomain' ]]; then
    echo "$1"
  else
    GLOBAL_APP_LOCATION="/Applications/$1.app"
    USER_APP_LOCATION="$HOME/Applications/$1.app"
    SYSTEM_APP_LOCATION="/System/Applications/$1.app"
    CORE_SERVICES_APP_LOCATION="/System/Library/CoreServices/$1.app"
    if [ -d "$GLOBAL_APP_LOCATION" ]; then
      echo "$(mdls -name kMDItemCFBundleIdentifier -r "$GLOBAL_APP_LOCATION")"
    elif [ -d "$USER_APP_LOCATION" ]; then
      echo "$(mdls -name kMDItemCFBundleIdentifier -r "$USER_APP_LOCATION")"
    elif [ -d "$SYSTEM_APP_LOCATION" ]; then
      echo "$(mdls -name kMDItemCFBundleIdentifier -r "$SYSTEM_APP_LOCATION")"
    elif [ -d "$CORE_SERVICES_APP_LOCATION" ]; then
      echo "$(mdls -name kMDItemCFBundleIdentifier -r "$CORE_SERVICES_APP_LOCATION")"
    else
      echo "$SYSTEM_APP_LOCATION" 1>&2
      echo "Unable to resolve domain for app named '$1'" 1>&2
      return 1
    fi
  fi
}

backup() {
  BACKUP_FILE="$HOME/.defaults/$1.plist"
  defaults export "$1" "$BACKUP_FILE" && plutil -convert xml1 "$BACKUP_FILE" 
  if [[ $? == 0 ]]; then
    echo "Exported domain '$1' to $BACKUP_FILE"
    if [ "$READBACK" = true ]; then plutil -p "$BACKUP_FILE"; fi
  else
    echo "Failed to export domain '$1'"
    exit 1
  fi
}

restore() {
  if [ ! -f "$HOME/.defaults/$1.plist" ]; then
    echo "No backup exists for the domain '$1'"
    exit 1
  fi
  defaults import "$1" "$HOME/.defaults/$1.plist"
  if [[ $? == 0 ]]; then
    echo "Imported domain '$1'"
    if [ "$READBACK" = true ]; then defaults read $1; fi
  else
    echo "Failed to import domain '$1'"
    exit 1
  fi
}

backup_all() {
  READBACK=false
  for BACKUP_FILE in $HOME/.defaults/*.plist; do
    DOMAIN="$(basename "$BACKUP_FILE" .plist)"
    backup "$DOMAIN"
  done
}

restore_all() {
  READBACK=false
  for BACKUP_FILE in $HOME/.defaults/*.plist; do
    DOMAIN="$(basename "$BACKUP_FILE" .plist)"
    restore "$DOMAIN"
  done
}

while [ ! $# -eq 0 ]; do
    case "$1" in
        -r | --restore)
            if [ "$2" ]; then
                DOMAIN="$(resolve_domain "$2")"
                if [[ $? != 0 ]]; then exit 1; fi
                restore "$DOMAIN"
                exit
            else
                echo '--restore requires a DOMAIN'
                exit 1
            fi
            ;;
        -b | --backup)
            if [ "$2" ]; then
                OPERATION='backup'
                DOMAIN="$(resolve_domain "$2")"
                if [[ $? != 0 ]]; then exit 1; fi
                backup "$DOMAIN"
                exit
            else
                echo '--backup requires a DOMAIN'
                exit 1
            fi
            ;;
        -R | --restore-all)
            restore_all
            exit
            ;;
        -B | --backup-all)
            backup_all
            exit
            ;;
        -h | --help)
            usage
            exit
            ;;
        *)
            usage
            exit
            ;;
    esac
    shift
done

usage