txt2linkable.rb

#!/usr/bin/env ruby

def pbcopy(input)
    str = input.to_s
    IO.popen('pbcopy', 'w') { |f| f << str }
    str
end

output=''

ARGV.each_with_index { |arg, index|
    unless index == 0
        output.concat('-')
    end

    output.concat(arg.downcase.gsub(/[^[:alnum:]]/,''))
}

pbcopy output
print output

print "\n"

Changes a heading (e.g. My New Gist) to something that can be an element id or class (e.g. my-new-gist). Works great when piping to pbcopy.