some file exceptions sorted

file_nav.rb

@@ -4,10 +4,10 @@ class DirTermine
 
   attr_accessor :save_dir, :source_dir
 
-  def initialize
+  # def initialize
-    @save_dir = save_dir
+  #   @save_dir = save_dir
-    @source_dir = source_dir
+  #   @source_dir = source_dir
-  end
+  # end
 
   def destination_dir
     puts 'Please enter desired save directory (Leave blank for ~/Pictures/stickerized)'
@@ -20,11 +20,11 @@ class DirTermine
     dir = gets.chomp
     Dir.getwd if dir.empty?
   end
-
+  # 
-  def establish_dirs
+  # def establish_dirs
-    @source_dir = File.expand_path(origin_dir)
+  #   @source_dir = File.expand_path(origin_dir)
-    @save_dir = File.expand_path(destination_dir)
+  #   @save_dir = File.expand_path(destination_dir)
-  end
+  # end
 
   def dbug
     puts @source_dir
@@ -32,6 +32,6 @@ class DirTermine
   end
 end
 
-testr = DirTermine.new
+# testr = DirTermine.new
-testr.establish_dirs
+# testr.establish_dirs
-testr.dbug
+# testr.dbug

main.rb

@@ -0,0 +1,6 @@
+# frozen_string_literal: true
+
+require_relative 'stickerizer'
+
+sticker_machine = Stickerizer.new
+sticker_machine.convert_images

stickerizer.rb

@@ -1,12 +1,44 @@
 # frozen_string_literal: true
 
 require 'mini_magick'
+require_relative 'file_nav'
 
 class Stickerizer
+  def initialize
+    @convert = DirTermine.new
+  end
+
   def stickerize(pic_file, save_dir)
     image = MiniMagick::Image.open(pic_file)
     image.resize '512x512'
     image.format 'png'
-    image.write "#{save_dir}#{pic_file}"
+    image.write "#{save_dir}#{pic_file}_stickerized.png"
+  end
+
+  def origin_dir
+    @convert.origin_dir
+  end
+
+  def dest_dir
+    @convert.destination_dir
+  end
+
+  def valid?(file)
+    valid = false
+    extension = file[-4..-1]
+    valid = true if extension == '.png'
+    valid = true if extension == '.jpg'
+    valid = true if extension == '.gif'
+    puts "File #{file}: valid: #{valid.to_s}"
+    valid
+  end
+
+  def convert_images
+    origin = origin_dir
+    destination = dest_dir
+    Dir.children(origin).each do |unstickerized|
+      next unless valid?(unstickerized)
+      stickerize("#{origin}/#{unstickerized}", destination)
+    end
   end
 end