Convert plain text lists to HTML lists

gistfile1.rb

# Simple function that takes a text list and creates an HTML list
# from it. This is useful as a textmate command when marking up
# plain text.
#
# This will take the following text:
#
#   1. line 1
#   2. line 2
#
# And output:
#
#   <ol>
#     <li>line 1</li>
#     <li>line 2</li>
#   </ol>
#
# When the lines start with a number, a <ol> is used. If not, a
# <ul> is used.
#
def to_list(text)
  ol_prefix = /^\d+\.?\s*/
  ul_prefix = /^[^\s]+\s*/

  lines = text.split("\n").map { |line| line.strip }
  if lines.any?
    tag, pattern = lines.first =~ ol_prefix ? ['ol', ol_prefix] : ['ul', ul_prefix]
    "<#{tag}>\n%s</#{tag}>" % lines.inject('') { |output, line| output += "\t<li>%s</li>\n" % line.gsub(pattern, '') }
  else
    text
  end
end