build_reveal_slides_to_file.rb

#
# Jennings Anderson 2016
#
# Compile a 'slides' directory to a reveal presentation (with customizations)
#
#

def run_build(args={})
	print "Building: "

	out_file     = args["file"] || "index.html"
	slides_dir   = args["slides"] || "slides"
	front_matter = args["front_matter"]	

	slide_files = Dir.glob(slides_dir+"/**/**")

	slide_files.reject!{|x| !x.end_with? '.html'}

	slides = slide_files.map{|x| {slide: x[x.rindex("/")+1 .. -1].to_f, file: x}}

	slides.sort_by!{|x| x[:slide]}

	print "["
	
	File.open(out_file,'w') do |f|
		f.puts(args.to_yaml)
		f.puts('---')
		slides.each do |s|
			f.puts("<!-- Slide: #{s[:slide]}-->")

			this_slide = File.read(s[:file])
			if this_slide.start_with? "-----"
				sections = this_slide.split("-----")
				f.puts("<section #{sections[1].chomp}>")
				f.puts(sections[2])
				f.puts('</section>')
			else
				f.puts('<section>')
				f.puts(this_slide)
				f.puts('</section>')
			end
			print "."
		end
	end
	puts ']'
end

if __FILE__ == $0

	require 'listen'
	require 'yaml'

	config_file = ARGV[0] || 'config.yml'
	
	config = YAML.load(File.read(config_file))

	run_build(	config  )
	
	listener = Listen.to(config["slides"]) do |modified, added, removed| 
		run_build(	config  )
	end

	listener.start
	sleep

end