mirror of https://github.com/captn3m0/muse-dl.git
115 lines
3.4 KiB
Crystal
115 lines
3.4 KiB
Crystal
require "process"
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require "file"
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require "./fetch"
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require "./errors/*"
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module Muse::Dl
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class Pdftk
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PDFTK_BINARY_NAME = "pdftk"
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@binary = "/usr/sbin/pdftk"
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@tmp_file_path : String
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getter :binary
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def initialize(tmp_file_path : String)
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@tmp_file_path = tmp_file_path
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possible_binary = Process.find_executable(Pdftk::PDFTK_BINARY_NAME)
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if possible_binary
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@binary = possible_binary
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else
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puts "Could not find pdftk binary, exiting"
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Process.exit(1)
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end
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end
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def execute(args : Array(String))
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Process.run(@binary, args)
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end
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def strip_first_page(input_file : String)
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output_pdf = File.tempfile("muse-dl-temp", ".pdf")
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execute [input_file, "cat", "2-end", "output", output_pdf.path]
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File.rename output_pdf.path, input_file
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end
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def add_bookmark(input_file : String, title : String)
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output_pdf = File.tempfile("muse-dl-temp", ".pdf")
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bookmark_text_file = File.tempfile("muse-dl-chapter-tmp", ".txt")
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bookmark_text = <<-END
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BookmarkBegin
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BookmarkTitle: #{title}
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BookmarkLevel: 1
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BookmarkPageNumber: 1
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END
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File.write(bookmark_text_file.path, bookmark_text)
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execute [input_file, "update_info", bookmark_text_file.path, "output", output_pdf.path]
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# Cleanup
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bookmark_text_file.delete
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File.rename output_pdf.path, input_file
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end
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def add_metadata(input_file : File, output_file : String, book : Book)
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# First we have to dump the current metadata
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metadata_text_file = File.tempfile("muse-dl-metadata-tmp", ".txt")
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# TODO: Add version info in the Creator/Producer
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text = <<-EOT
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InfoBegin
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InfoKey: Creator
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InfoValue: Project MUSE (https://muse.jhu.edu/)
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InfoBegin
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InfoKey: Producer
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InfoValue: Muse-DL
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InfoBegin
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InfoKey: Title
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InfoValue: #{book.title}
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InfoBegin
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InfoKey: Keywords
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InfoValue: Publisher: #{book.publisher}, Published #{book.date}
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InfoBegin
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InfoKey: Author
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InfoValue: #{book.author}
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InfoBegin
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InfoKey: Subject
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InfoValue: #{book.summary.gsub("\n", " ")}
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EOT
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# Known Info keys, if they are present
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["ISBN", "Related ISBN", "DOI", "Language", "OCLC"].each do |label|
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if book.info.has_key? label
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text += <<-EOT
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InfoBegin
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InfoKey: #{label}
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InfoValue: #{book.info[label]}
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EOT
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end
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end
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File.write(metadata_text_file.path, text)
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execute [input_file.path, "update_info_utf8", metadata_text_file.path, "output", output_file]
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metadata_text_file.delete
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end
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def stitch(chapter_ids : Array(String))
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output_file = File.tempfile("muse-dl-stitched-tmp", ".pdf")
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# Do some sanity checks on each Chapter PDF
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chapter_ids.each do |id|
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raise Muse::Dl::Errors::MissingChapter.new unless File.exists? Fetch.chapter_file_name(id, @tmp_file_path)
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raise Muse::Dl::Errors::CorruptFile.new unless File.size(Fetch.chapter_file_name(id, @tmp_file_path)) > 0
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end
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# Now let's stitch them together
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chapter_files = chapter_ids.map { |id| Fetch.chapter_file_name(id, @tmp_file_path) }
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args = chapter_files + ["cat", "output", output_file.path]
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execute args
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# TODO: Validate final file here
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return output_file
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end
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end
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end
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