Slug function where there is no trailing slash (note that `contact.html` and `contact/index.html` return the same value)

slug-version-1.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...
# URL: /contact/index.html  SLUG: /contact
# URL: /index.html          SLUG: /
# URL: index.html           SLUG: /         # ... except here.
# 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
    # The last non-regex part is to make sure `/index.html` resolves as `/` and not an empty string
    self.fixed_octopress_url.sub( /(\/)?(index)?\.html?$/ , "" ) || "/"
end