Populate Jekyll data directories with the jpegs found in _galleries/foo.

make_data.rb

#!/usr/bin/env ruby
require 'yaml'
require 'mini_exiftool'

# Run this in the root of your jekyll install.

gallery_name = ARGV[0]
target_dir = "_galleries/#{gallery_name}"
data_file =  "_data/galleries/#{gallery_name}.yml"

def stringify(hash)
  hash.map{|k, v| [k.to_s, v.is_a?(Hash) ? stringify(v) : v] }.to_h
end

if(File.exist?(data_file))
  photo_data = YAML.load_file(data_file)
else
  photo_data = Hash.new
end

jpegs = Dir.glob("#{target_dir}/*.jpg")



jpegs.each do |jpeg|
  jpeg_name = File.basename(jpeg)
  data = MiniExiftool.new jpeg
  puts  data.title

    if photo_data[jpeg_name] && photo_data[jpeg_name]["description"] == ''
        photo_data[jpeg_name]["description"] = data.title
      else
          photo_data[jpeg_name] =  {"description": data.title}
    end
  end

data_yaml = stringify(photo_data).to_yaml

File.open(data_file, "w") { |file| file.write(data_yaml) }