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#!/usr/bin/env ruby
# coding: utf-8
# desc: backup files according to a yaml file
# author: eric
require 'yaml'

BACKUP_DIR_PREFIX = "#{Dir.home}/.sync/Seafile/"
DATA_PATH = "#{Dir.home}/.backup.yaml"

def sync_exec args
  rsync_opt = '--times --recursive'
  file = args[:file].dup
  dest = args[:dest].dup

  if args[:relative] == true
    rsync_opt << " --relative"
    file.sub!(args[:strip], "") if args[:strip]
  end

  cmd = %[rsync #{rsync_opt} '#{file}' '#{dest}']

  # pass "test" as command parameter to dry-run.
  unless ARGV.include? "test"
    if system cmd
      print "[" + "\e[32m" + "done" + "\e[0m" + "]" # done: green
    else
      print "[" + "\e[31m" + "failed" + "\e[0m" + "]" # failed: red
    end
    puts args[:file]
  else
    puts cmd
  end
end

def sync list
  dest = BACKUP_DIR_PREFIX + list['backup_dir']
  # relative copy
  if list['relative_copy'] == true
    # if need to strip prefix
    if list['strip_prefix']
      Dir.chdir list['strip_prefix'] do
        list['files'].each do |file|
          sync_exec file: file,
                    dest: dest,
                    relative: true,
                    strip: list['strip_prefix']
        end
      end
    # standard relative copy
    else
      list['files'].each do |file|
        sync_exec file: file,
                  dest: dest,
                  relative: true
      end
    end
  # normal copy
  else
    list['files'].each do |file|
      sync_exec file: file, dest: dest
    end
  end
end

# main
data = File.open(DATA_PATH) { |f| YAML.load f }
data.each do |list|
  if ARGV.include? "test"
    print "\e[32m"
      print list['strip_prefix'] + ' ' if list['strip_prefix']
      print  "=> #{BACKUP_DIR_PREFIX}#{list['backup_dir']}"
    print "\e[0m" + "\n"
  end

  sync list
end