gistfile1.rb

#!/usr/bin/env ruby
$: << ENV['TM_SUPPORT_PATH'] + '/lib'
require 'escape'
def esc(str)
  e_sn(str).gsub(/\}/, '\\}') # escaping inside a placeholder
end

s = STDIN.read
if s.empty? then
  print "<strike>$1</strike>"
elsif s =~ /^\*{2}(.*)\*{2}$/ then
  print "${1:#{esc $1}}"
elsif ENV.has_key? 'TM_SELECTED_TEXT'
  print "${1:<strike>#{esc s}</strike>}"
else
  print "<strike>#{e_sn s}</strike>"
end