photos.rake

# Author: Vitalie Lazu
# Date: Mon, 01 Dec 2008 14:28:28 +0200

# Rake tasks to help you with family photos:
# * Download photos from camera
# * Arrange photos in folders by date like digikam, 
# * Rotate them according exif information
#
# Setup to use this tasks:
# apt-get install rubygems imagemagick gphoto2 rake
# gem install exifr

namespace :ph do
  desc "Get photos from camera to current folder"
  task :get do
    sh "gphoto2 -R -P"
  end

  desc "Delete all photos from camera"
  task :delete do
    sh "gphoto2 -R -D"
  end

  desc "Rotate photos from exif info"
  task :rotate => :init do
    for_each_image do |fname, info|
      p info.orientation

      if info.orientation
        x = FakeImg.new
        info.orientation.transform_rmagick(x)
        op = x.to_s

        dest_file = "r-" << fname

        if op.length > 0
          mv fname, dest_file
          cmd = "convert '#{dest_file}' #{op} '#{fname}'"
          puts cmd
          sh cmd
        end
      end
    end
  end

  desc "Arrange photos in folders by date"
  task :arrange => :init do
    for_each_image do |fname, info|
      dir = info.date_time.strftime("%Y-%m-%d")
      op = info.orientation.transform_rmagick(FakeImg.new).to_s
      print "%s %s %s\n" % [fname, dir, op]

      dest_file = File.join(dir, fname)
      mkdir_p dir

      if op.length > 0
        cmd = "convert '#{fname}' #{op} '#{dest_file}'"
        puts cmd
        sh cmd
      else
        if test ?f, dest_file
          puts "File exits: #{dest_file}"
        else
          mv fname, dest_file
        end
      end
    end
  end

  desc "Show photos info"
  task :list => :init do
    for_each_image do |fname, info|
      print "%s %s %s\n" % [fname, info.date_time, info.orientation.transform_rmagick(FakeImg.new).to_s]
    end
  end

  task :init do
    require 'rubygems'
    require 'exifr'
  end

  def for_each_image(&block)
    for fname in Dir["*"]
      next unless test(?f, fname) && fname =~ /\.jpe?g$/i
      yield fname, EXIFR::JPEG.new(fname)
    end
  end

  class FakeImg
    def initialize
      @cmd = []
    end

    def flip
      @cmd << "-flip"
      self
    end

    def flop
      @cmd << "-flop"
      self
    end

    def rotate(degrees)
      @cmd << "-rotate #{degrees.to_i}" if degrees.to_i != 0
      self
    end

    def to_s
      @cmd * ' '
    end
  end
end