Slug function where there IS a trailing slash (note the difference between `contact.html` and `contact/index.html`)

slug-version-2.rb

#  Sample output:
# URL: /contact.html        SLUG: /contact
# URL: /contact.htm         SLUG: /contact
# URL: contact.html         SLUG: contact    # The output only starts with a forward-slash if the input does (always)
# URL: /contact/index.html  SLUG: /contact/  # <-- Here is the major difference between this and the other version
# URL: /index.html          SLUG: /
# URL: index.html           SLUG: (empty string)
# URL: /dummy/.html         SLUG: /dummy/    # Just don't use stupid page names like this
# URL: /.html               SLUG: /          # Again, I'm just too lazy to account for stupid cases
# URL: /funny/images/cats.html    SLUG: /funny/images/cats/

def slug
    # If `html?` remove trailing '.html' (or trailing '.htm')
    # If `index?` remove trailing 'index.html'
    # Done with regex instead of calling those two functions
    self.fixed_octopress_url.sub( /(index)?\.html?$/ , "" )
end