49 lines
1.5 KiB
Ruby
49 lines
1.5 KiB
Ruby
# Automatic Image Sizes extension
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class Middleman::Extensions::AutomaticImageSizes < ::Middleman::Extension
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def initialize(app, options_hash={}, &block)
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super
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# Include 3rd-party fastimage library
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require 'fastimage'
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end
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helpers do
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# Override default image_tag helper to automatically calculate and include
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# image dimensions.
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#
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# @param [String] path
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# @param [Hash] params
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# @return [String]
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def image_tag(path, params={})
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if !params.key?(:width) && !params.key?(:height) && !path.include?('://')
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real_path = path.dup
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real_path = File.join(config[:images_dir], real_path) unless real_path.start_with?('/')
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file = app.files.find(:source, real_path) || app.files.find(:source, real_path.sub(/^\//, ''))
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if file && file[:full_path].exist?
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begin
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full_path = file[:full_path].to_s
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width, height = ::FastImage.size(full_path, raise_on_failure: true)
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# Check for @2x and @3x image
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retina = full_path.match(/@(\d)x\.[a-zA-Z]{3,4}$/)
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if retina
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factor = retina[1].to_i
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width /= factor
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height /= factor
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end
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params[:width] = width
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params[:height] = height
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rescue FastImage::UnknownImageType
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# No message, it's just not supported
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rescue
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warn "Couldn't determine dimensions for image #{path}: #{$ERROR_INFO.message}"
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end
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end
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end
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super(path, params)
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end
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end
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end
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