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Versions: 13
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Contents
require 'image_optim/path'
class ImageOptim
# Handles processing of original to result using upto two temp files
class Handler
# Holds latest successful result
attr_reader :result
# original must respond to temp_path
def initialize(original)
unless original.respond_to?(:temp_path)
fail ArgumentError, 'original should respond to temp_path'
end
@original = original
@result = nil
end
# with no associated block, works as new. Otherwise creates instance and
# passes it to block, runs cleanup and returns result of handler
def self.for(original)
handler = new(original)
if block_given?
begin
yield handler
handler.result
ensure
handler.cleanup
end
else
handler
end
end
# Yields two paths, one to latest successful result or original, second to
# temp path
def process
@src ||= @original
@dst ||= @original.temp_path
return unless yield @src, @dst
@result = @dst
if @src == @original
@src, @dst = @dst, nil
else
@src, @dst = @dst, @src
end
end
# Remove extra temp files
def cleanup
return unless @dst
@dst.unlink
@dst = nil
end
end
end
Version data entries
13 entries across 13 versions & 2 rubygems