generate_image_meta_yaml.rb

#!/usr/bin/env ruby
require 'rubygems'
require 'find'
require 'yaml'

module ImageMetaYamlGenerator
  # via http://www.atmarkit.co.jp/flinux/rensai/linuxtips/294grainfo.html
  def self.identify(image_file)
    result = `identify #{image_file}`
    list = result.split(/\s/)
    w,h = list[2].split(/x/).map{|v| v.to_i}
    return {
      :filename => image_file,
      :type => list[1],
      :width => w,
      :height => h,
      :description => '',
    }
  end

  def self.run(dir)
    files = []
    Find.find(dir) do |path|
      if File.file?(path) && path =~ /\.(jpg|jpeg|gif)$/i
        files.push identify(path)
      end
    end
    yaml = YAML.dump(files, File.open("#{dir}/image_meta__template.yaml", "w"))
  end
end

dir = File.expand_path(ARGV[0] || './kiva')
ImageMetaYamlGenerator.run dir