groubranchhiter: indent most of the inner code We are going to add an additional layer of indentation to support non-contiguous revset. We do it in a pure code movement changeset to help the readability of the next changeset.

graphlog: add a way to test the 'groupbranchiter' function We add an experimental config option to use the topological sorting. I first tried to hook the 'groupbranchiter' function in the 'sort' revset but this was useless because graphlog enforces revision number sorting :( As the goal is to advance on the topological iteration logic, I see this experimental option as a good way to move forward. We have to use turn the iterator into a list because the graphlog is apparently not ready for pure iterator input yet.

graphmod: add a function for topological iteration This changeset introduces a function to perform topological (one branch after the other) iteration over a set of changesets. This first version has a lot of limitations, but the approach should be flexible enough to allow many improvements in the future. This changeset aims to set the first stone more than providing a complete solution. The algorithm does not need to know the whole set of nodes involved before emitting revision. This makes it a good candidate for usage in place like `hg log` or graphical tools that need a fast first result time.

namespaces: add branches Note that the exception-catching from the previous branchtip check is moved up to catch exceptions from the try block surrounding the namespace lookup.

namespaces: add tags

namespaces: remove weakref; always pass in repo It turns out that maintaining a reference of any sort (even weak!) to the repo when constructed doesn't work because we may at some point pass in a repoview filtered by something other than what the initial repo was.

changectx: use names api to simplify and extend node lookup Previously, changectx had to know about each type of name (bookmark, tag, etc.) to look up. Now, we use repo.namenodes to simplify (and extend) this.

namespaces: add a method to the first matching node for a given name

namespaces: add bookmarks to the names data structure This marks the first use of abstracting our different types of named objects (bookmarks, tags, branches, etc.) and upcoming patches will use this to simplify logic.

namespaces: add a convenience property for the weakref _repo