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# frozen_string_literal: true
require_relative '../optimizer' unless defined? Asciidoctor::PDF::Optimizer
require 'pathname'
require 'rghost'
require 'rghost/gs_alone'
require 'tmpdir'
autoload :Open3, 'open3'
# rghost still uses File.exists?
File.singleton_class.alias_method :exists?, :exist? unless File.respond_to? :exists?
RGhost::GSAlone.prepend (Module.new do
def initialize params, debug
(@params = params.drop 0).push(*(@params.pop.split File::PATH_SEPARATOR))
@debug = debug
end
def run
RGhost::Config.config_platform unless File.exist? RGhost::Config::GS[:path].to_s
(cmd = @params.drop 1).unshift RGhost::Config::GS[:path].to_s
#puts cmd if @debug
_out, err, status = Open3.capture3(*cmd)
unless (lines = err.lines.each_with_object([]) {|l, accum| (l.include? '-dNEWPDF=') ? accum.pop : (accum << l) }).empty?
$stderr.write(*lines)
end
status.success?
end
end)
RGhost::Engine.prepend (Module.new do
def shellescape str
str
end
end)
module Asciidoctor
module PDF
class Optimizer::RGhost < Optimizer::Base
DEFAULT_PARAMS = %w(gs -dNOPAUSE -dBATCH -dQUIET -dNOPAGEPROMPT)
# see https://www.ghostscript.com/doc/current/VectorDevices.htm#PSPDF_IN for details
(QUALITY_NAMES = {
'default' => :default,
'screen' => :screen,
'ebook' => :ebook,
'printer' => :printer,
'prepress' => :prepress,
}).default = :default
def initialize *_args
super
if @quality&.include? ':'
@quality, @color_mode = @quality.split ':', 2
else
@color_mode = nil
end
if (gs_path = ::ENV['GS'])
::RGhost::Config::GS[:path] = gs_path
end
@newpdf = false
default_params = DEFAULT_PARAMS.drop 0
if (user_params = ::ENV['GS_OPTIONS'])
(default_params += user_params.split).uniq!
@newpdf = nil if default_params.find {|it| it.start_with? '-dNEWPDF=' }
end
::RGhost::Config::GS[:default_params] = default_params
end
def optimize_file target
::Dir::Tmpname.create ['asciidoctor-pdf-', '.pdf'] do |tmpfile|
filename_o = ::Pathname.new target
filename_tmp = ::Pathname.new tmpfile
if (pdfmark = filename_o.sub_ext '.pdfmark').file?
inputs = [target, pdfmark.to_s].join ::File::PATH_SEPARATOR
else
inputs = target
end
d = { Printed: false, CannotEmbedFontPolicy: '/Warning', CompatibilityLevel: @compatibility_level }
d[:NEWPDF] = @newpdf unless @newpdf.nil?
case @compliance
when 'PDF/A', 'PDF/A-1', 'PDF/A-2', 'PDF/A-3'
d[:PDFA] = ((@compliance.split '-', 2)[1] || 1).to_i
d[:ShowAnnots] = false
when 'PDF/X', 'PDF/X-1', 'PDF/X-3'
d[:PDFX] = true
d[:ShowAnnots] = false
end
case @color_mode
when 'gray', 'grayscale'
s = { ColorConversionStrategy: 'Gray' }
when 'bw'
d[:BlackText] = true
s = { ColorConversionStrategy: 'Gray' }
end
(::RGhost::Convert.new inputs).to :pdf, filename: filename_tmp.to_s, quality: QUALITY_NAMES[@quality], d: d, s: s
filename_o.binwrite filename_tmp.binread
end
nil
end
end
end
end
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