Created
March 23, 2017 22:24
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Make PDF slides from Inkscape document with layers
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#!/usr/bin/env ruby | |
# Steven Bell <sebell@stanford.edu>, based on https://gist.github.com/emk/961877 | |
require 'rubygems' | |
require 'nokogiri' | |
require 'fileutils' | |
include FileUtils | |
# Delete all temporary PDF files | |
def delete_temporary_files | |
rm_f 'temp.svg' | |
Dir['slide-*.pdf'].each {|p| rm p } | |
end | |
# Script requires an input svg file | |
unless ARGV.length == 1 | |
puts "Incorrect number of arguments" | |
puts "Usage: mkpdfs.rb SVGFILE\n" | |
exit | |
end | |
# Clean up any files left over from our last run. | |
delete_temporary_files | |
# Read in our presentation SVG. | |
doc_path = ARGV[0] | |
out_path = doc_path.split(".")[0] + ".pdf" | |
doc = open(doc_path) {|f| Nokogiri::XML(f) } | |
# Iterate over all the layers in our presentation. | |
slide_ids = [] | |
doc.xpath('/svg:svg/svg:g[@inkscape:groupmode="layer"]').each do |layer| | |
# Collect the IDs of our slides. | |
slide_ids << layer['id'] | |
# Hide layers labelled "hidden" (which contain our tools) and show | |
# all other layers. | |
if layer['label'] =~ /^hidden: / | |
layer['style'] = 'display:none' | |
else | |
layer['style'] = 'display:inline' | |
end | |
end | |
#slide_ids.reverse! | |
# Write out the modified SVG file. | |
File.open('temp.svg', 'w') {|f| f.write(doc.to_xml) } | |
# Generate a PDF for each slide. | |
slide_ids.each_with_index do |slide_id, i| | |
pdf_name = sprintf("slide-%03d.pdf", i) | |
puts "Exporting #{pdf_name}" | |
system("inkscape", "--export-pdf=#{pdf_name}", "--export-dpi=300", | |
"--export-id=#{slide_id}", "--export-area-page", "temp.svg") or | |
raise "Unable to export page" | |
end | |
# Combine our PDF files. Try pdftk first, then fallback to pdfjoin | |
slides = Dir["slide-*.pdf"].sort | |
system(*(["pdftk"] + slides + ["cat", "output", out_path])) or | |
system(*(["pdfjoin"] + slides + ["--outfile", out_path])) or | |
raise "Unable to merge PDFs - make sure pdftk or pdfjoin is installed." | |
# Clean up our temporary files. | |
delete_temporary_files |
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I rewrote this in Python and added some features: https://gist.github.com/stevenbell/909c79c9396f932942476e658b38d80c