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Contents
module Softcover
module Builders
class Preview < Builder
def build!
if article?
$stderr.puts "Previews not supported for articles"
exit(1)
end
# Recall that MOBI generation makes an EPUB as a side-effect.
Softcover::Builders::Mobi.new.build!(preview: true)
Softcover::Builders::Pdf.new.build!(preview: true)
extract_pdf_pages
end
private
# Extracts pages from the PDF using GhostScript.
# The page range is set by the `pdf_preview_page_range` parameter
# in book.yml so that authors can override the default range.
def extract_pdf_pages
input = File.join('ebooks', manifest.filename + '.pdf')
output = input.sub('.pdf', '-preview.pdf')
unless manifest.respond_to?(:pdf_preview_page_range)
$stderr.puts("Error: Preview not built")
$stderr.puts("Define pdf_preview_page_range in config/book.yml")
$stderr.puts("See http://manual.softcover.io/book/getting_started#sec-build_preview")
exit(1)
end
range = manifest.pdf_preview_page_range.split('..').map(&:to_i)
cmd = %(yes | #{ghostscript} -dBATCH -sOutputFile="#{output}")
cmd += %( -dFirstPage=#{range.first} -dLastPage=#{range.last})
cmd += %( -sDEVICE=pdfwrite "#{input}" > /dev/null 2> /dev/null)
execute cmd
end
def ghostscript
@ghostscript ||= executable(dependency_filename(:ghostscript))
end
end
end
end
Version data entries
84 entries across 84 versions & 1 rubygems