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Lazy footnotes for Markdown, based on TidBits lazy link style
#!/usr/bin/env ruby
# encoding: utf-8
=begin
http://marked2app.com
Marked 2 preprocessor - "Lazy" footnotes.
Allows use of `[^]` or `†` footnote references
where the next [^]: or †: note defines the text of the footnote.
† - Option-T
^ - Shift-6
Footnotes are given random prefixes to avoid duplication of ids within
a page.
Example:
Lorem ipsum dolor sit amet[^], consectetur adipisicing elit, sed do
eiusmod tempor† incididunt ut labore et dolore magna aliqua. Ut enim
ad minim veniam, quis nostrud exercitation[^] ullamco laboris nisi ut
aliquip ex ea commodo consequat.
[^]: This footnote will replace the first `[^]` found in the text.
†: This one will replace the first `†`. The syntaxes are auto-detected
and interchangeable.
[^]: This one replaces the second instance.
Inspired by [tidbits][^] and Carl Johnson†
[^]: http://tidbits.com
†: http://blog.carlsensei.com/
=end
# Marked sends the Markdown text to STDIN when calling the script.
if RUBY_VERSION.to_f > 1.8
input = STDIN.read.force_encoding('UTF-8')
else
input = STDIN.read
end
# random prefix and footnote counter
rand = rand(100000) + 100000
counter = 0
def replace_caret(input, prefix, counter)
input.sub(/(\[)\^(\].*?\[)\^\]:/m) {
%Q{#{$1}^fn#{prefix}-#{counter.to_s}#{$2}^fn#{prefix}-#{counter.to_s}]:}
}
end
def replace_cross(input, prefix, counter)
input.sub(/([^†]+)(.*?)†:/m) {
%Q{#{$1}[^fn#{prefix}-#{counter.to_s}]#{$2}[^fn#{prefix}-#{counter.to_s}]:}
}
end
while input =~ /(\[\^\].*?\[\^\]:|†.*?†:)/m
idx_caret = input.index(/\[\^\].*?\[\^\]:/m) || false
idx_cross = input.index(/†.*?†:/m) || false
break if !idx_caret && !idx_cross
if ((idx_caret && idx_cross && idx_caret < idx_cross) || (idx_caret && !idx_cross))
input = replace_caret(input, rand, counter += 1)
elsif (idx_cross)
input = replace_cross(input, rand, counter += 1)
end
end
print input
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