This reverts a bit of the work @willnorris had made to support
extensionless permalinks. Using the ‘permalink’ front matter will no
longer work as it must allow non-html extensions to be written.
This updates the default permalink style for pages and collections to
match the site-wide 'permalink' setting. If the permalink setting
contains a trailing slash, either explicitly or by being set to
':pretty', then pages and collections permalinks will contain trailing
slashes by default as well. Similarly, if the permalink setting
contains a trailing ':output_ext', so will pages and collections. If
the permalink setting contains neither a trailing slash or extension,
neither will pages or collections.
This impacts only the default permalink structure for pages and
collections. Permalinks set in the frontmatter of an individual page
take precedence, as does the permalink setting for a specific
collection.
Fixes#2691
This ensures that destination files for HTML posts, pages and
collections always include the proper file extension (as defined by
output_ext) regardless of permalink structure. This allows for URLs
that contain no extension or trailing slash to still result in proper
destination files with .html extensions.
Because this change relies so heavily on output_ext accurately
identifying the extension of the destination file, this change also
removes the feature test that tested support for permalinks with a .htm
extension. In order to support alternate file extensions, a future
patch or plugin will need to modify the output_ext value, at which point
everything else should work as expected.
Post#url wasn't escaped at all.
For example, when we have a page named 'a#b.html',
we expect its url to be 'a%23b.html',
but it was actually 'a#b.html'.
We now use Jekyll::URL.escape_path and Jekyll::URL.unescape_path.
