filelog: add the ability to report the user facing name This will be used by lfs, but is probably generally useful. There are various bits of code that reverse engineer this from the index or data file names, but it seems better to just store it. Especially if there's experimenting with backing storage other than revlog.

hgweb: make different kinds of commits look differently on /graph Regular hg log -G uses different symbols for some graph nodes, such as commits that close branches and hidden commits. It also marks the currently checked out commit with "@". Since hg serve is sometimes used/recommended as a more visual alternative to CLI, it makes sense to port these features to hgweb. "graphnode" includes the style of a particular node and also if it's currently checked out or not, both at the same time. This is different from hg log -G (which uses templatekw.showgraphnode), where there's only place for one character, but hgweb doesn't have this limitation, since it uses <canvas> and not plain text. I'm using one string of 1 or 2 characters in this patch, it's not the most self-explanatory format, but it's concise, uses the same characters as hg log -G, and is internal to hgweb (i.e. not used for json-graph). I'm more or less fine with how things look visually, but there's still room for improvement. Feel free to criticise or point me to good-looking graphs of this kind for inspiration.

clonebundle: make it possible to retrieve the initial bundle through largefile By setting the default path early enough, we make it possible to retrieve a clone bundle as a largefile from the repository we are cloning. But... why? Clone bundle is a great feature to speeds up clone of large repository. However one of the main obstacle for clone bundle deployment is the authentication scheme. For non public project, just putting a static file on some random CDN is not an option as we have to make sure people have the proper permission to retrieves the bundle. On the other hand, 'largefiles' already have all the necessary logic to serve arbitrary binary files -after- an authentication checks. So reusing an existing large file infrastructure can be a significant shortcut to clone bundle in this kind of closed environment. The idea might seems strange, but the necessary update to the large file extensions are quite small while the benefits are huge. In addition, since all the extra logic live in the 'largefiles' extensions, core does not have to know anything about it.

largefiles: add support for 'largefiles://' url scheme This changesets allows Mercurial to transparently download content from the configured largefile store. This handle all authentication and largefile protocol details. The target usecase is to leverage largefile infrastructure for clone bundle. See next changeset for details

largefiles: add a 'debuglfput' command to put largefile into the store We add a new debug command able to add arbitrary new files into the largefile store. This will be useful for debugging, testing and other unholy usecase.

debug: add a 'debugdownload' command This command resolve and fetch and URL through the Mercurial logic. Mercurial logic add various headers (including authentication) while resolving an URL so the commands helps with building the same request Mercurial would be doing. A new test file is created because we'll add more logic regarding Mercurial download logic and it will grow to a reasonable size.

revsetlang: raise ParseError to report invalid format character It's more common in revset and templater than raising Abort. I have a couple more patches to address exceptions caused by bad format string passed to revset() template function.

revsetlang: use iterator to track current argument in formatspec()