Add logger

examples/parse.rb

@@ -8,24 +8,24 @@
   psd.parse!
 end
 
-puts "\nVisible Layers:\n===================="
-psd.layers.each do |layer|
-  next if layer.folder? || layer.hidden?
+# puts "\nVisible Layers:\n===================="
+# psd.layers.each do |layer|
+#   next if layer.folder? || layer.hidden?
 
-  puts "Name: #{layer.name}"
-  puts "Position: top = #{layer.top}, left = #{layer.left}"
-  puts "Size: width = #{layer.width}, height = #{layer.height}"
-  puts "Mask: width = #{layer.mask.width}, height = #{layer.mask.height}"
-  puts "Reference point: #{layer.ref_x}, #{layer.ref_y}"
+#   puts "Name: #{layer.name}"
+#   puts "Position: top = #{layer.top}, left = #{layer.left}"
+#   puts "Size: width = #{layer.width}, height = #{layer.height}"
+#   puts "Mask: width = #{layer.mask.width}, height = #{layer.mask.height}"
+#   puts "Reference point: #{layer.ref_x}, #{layer.ref_y}"
 
-  puts ""
-end
+#   puts ""
+# end
 
-puts "\nPSD Info:\n===================="
-puts "#{psd.width}x#{psd.height} #{psd.header.mode_name}"
-puts "#{psd.resources.size} resources parsed"
-puts "#{psd.layers.size} layers, #{psd.folders.size} folders"
+# puts "\nPSD Info:\n===================="
+# puts "#{psd.width}x#{psd.height} #{psd.header.mode_name}"
+# puts "#{psd.resources.size} resources parsed"
+# puts "#{psd.layers.size} layers, #{psd.folders.size} folders"
 
-puts "\nBenchmark Results (seconds):\n===================="
-puts " "*7 + Benchmark::CAPTION
-puts "parse: " + results.to_s
+# puts "\nBenchmark Results (seconds):\n===================="
+# puts " "*7 + Benchmark::CAPTION
+# puts "parse: " + results.to_s

lib/psd.rb

@@ -19,6 +19,7 @@
 # the header, resources, the layer mask (including layers), and the preview image. We parse
 # each of these sections in order.
 class PSD
+  include Logger
   include Helpers
   include NodeExporting
 
@@ -50,6 +51,8 @@ def initialize(file, opts={})
   # parse all sections of the PSD.
   def parse!
     header
+    PSD.logger.debug header.inspect
+
     resources
     layer_mask
     image if @opts[:parse_image]

lib/psd/layer.rb

@@ -68,6 +68,8 @@ def parse(index=nil)
       parse_legacy_layer_name
       parse_extra_data
 
+      PSD.logger.debug "Layer name = #{name}"
+
       @file.seek @layer_end # Skip over any filler zeros
 
       end_section

lib/psd/logger.rb

@@ -0,0 +1,42 @@
+require 'logger'
+
+class PSD
+  module Logger
+    def self.included(base)
+      base.extend(ClassMethods)
+    end
+
+    module ClassMethods
+      @@debug = false
+
+      def logger
+        return @logger if @logger
+
+        if @@debug || ENV['PSD_DEBUG']
+          @logger = ::Logger.new(debug_output)
+          @logger.formatter = proc do |severity, datetime, progname, msg|
+            "#{severity}: #{msg}\n"
+          end
+        else
+          @logger = DisabledLogger.new
+        end
+
+        return @logger
+      end
+
+      def debug_output
+        if ENV['PSD_DEBUG']
+          ENV['PSD_DEBUG'] == 'STDOUT' ? STDOUT : ENV['PSD_DEBUG']
+        end
+
+        STDOUT
+      end
+    end
+  end
+
+  class DisabledLogger
+    def method_missing(method, *args, &block)
+      # silence
+    end
+  end
+end