class ActiveStorage::Previewer::MuPDFPreviewer
Public Class Methods
accept?(blob)
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# File lib/active_storage/previewer/mupdf_previewer.rb, line 6 def accept?(blob) blob.content_type == "application/pdf" && mutool_exists? end
mutool_exists?()
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# File lib/active_storage/previewer/mupdf_previewer.rb, line 14 def mutool_exists? return @mutool_exists if defined?(@mutool_exists) && !@mutool_exists.nil? system mutool_path, out: File::NULL, err: File::NULL @mutool_exists = $?.exitstatus == 1 end
mutool_path()
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# File lib/active_storage/previewer/mupdf_previewer.rb, line 10 def mutool_path ActiveStorage.paths[:mutool] || "mutool" end
Public Instance Methods
preview(**options) { |io: output, filename: "#{filename.base}.png", content_type: "image/png", **options| ... }
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# File lib/active_storage/previewer/mupdf_previewer.rb, line 23 def preview(**options) download_blob_to_tempfile do |input| draw_first_page_from input do |output| yield io: output, filename: "#{blob.filename.base}.png", content_type: "image/png", **options end end end
Private Instance Methods
draw_first_page_from(file, &block)
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# File lib/active_storage/previewer/mupdf_previewer.rb, line 32 def draw_first_page_from(file, &block) draw self.class.mutool_path, "draw", "-F", "png", "-o", "-", file.path, "1", &block end