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Contents
module Softcover
module Builders
class Preview < Builder
def build!
# 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')
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)
execute cmd
end
def ghostscript
filename = `which gs`.chomp
message = "Install GhostScript (should come with LaTeX)"
@ghostscript ||= executable(filename, message)
end
end
end
end
Version data entries
24 entries across 24 versions & 1 rubygems