pagerender.rb: add footnote support, arch-systemd.md: use it.

I saw that the new version of rdiscount supported php-markdown-extra style
footnotes and got excited.  However, when I enabled it, I was disappointed
to learn that it didn't support multi-line footnotes. Lame!

So, I implemented that as a pre/post processor.

1 files changed, 22 insertions, 2 deletions

diff --git a/pagerender.rb b/pagerender.rb
index 021f66c..ecedaae 100755
--- a/pagerender.rb
+++ b/pagerender.rb
@@ -13,14 +13,29 @@ input = ARGV.first
 
 lines = File.read(input).split("\n")
 
+footnote_start = /^\[\^/
+footnote_cont = /^(\t| {2,4})/
+
 markdown = ''
 tags = {}
+footnotes = {}
+footnote_label = nil
 for line in lines do
 	if (line =~ /^:/)
 		(key, val) = line.sub(/^:/, '').split(/\s+/, 2)
 		tags[key] = val
 	else
-		markdown += "\n"+line
+		if (line =~ footnote_start)
+			footnote_label, footnote_body = line.split(':', 2)
+			footnote_label.gsub!(/[\^\[\]:]/, '')
+			footnotes[footnote_label] = footnote_body+"\n"
+			markdown += "[^#{footnote_label}]: 555PHONYFOOTNOTE555#{footnote_label}\n"
+		elsif (!footnote_label.nil? and line =~ footnote_cont)
+			footnotes[footnote_label] += line.sub(footnote_cont, '')+"\n"
+		else
+			footnote_label = nil
+			markdown += line+"\n"
+		end
 	end
 end
 
@@ -31,7 +46,12 @@ unless license_urls[@license].nil?
 	@license="<a href=\"#{license_urls[@license]}\">#{@license}</a>"
 end
 
-@content = RDiscount.new(markdown).to_html
+renderer = RDiscount.new(markdown)
+renderer.footnotes = true;
+@content = renderer.to_html
+footnotes.each do |label, body|
+	@content.gsub!("555PHONYFOOTNOTE555#{label}", RDiscount.new(body).to_html)
+end
 
 erb = ERB.new(File.read(template));
 erb.filename = template