Re: [PATCH] gitweb: more support for PATH_INFO based URLs

matled (Matthias Lederhofer) on #git proposed to use ':' as a separator between branch and filename (as branch doesn't need to be flat, e.g. "jc/diff" like branch name), because valid branch name cannot contain ':' (and this limit is only for branch name).

He also said that filename doesn't need to be necessary file (which would be then present in "blob_plain" view), but it can be also a directory (which then would be present in "tree" view). We can either check type using git-cat-file -t via git_get_type subroutine, or assume that if we want for directory to be shown, it should end with "/".

Let's assume for simplicity that empty branch name equals to HEAD branch, and empty filename equals to top (root) directory of project.

So we would have the following types of path based URLs:

* project              overview (summary) page of project
* project/branch       shortlog of branch
* project/branch:file  file in branch, blob_plain view
* project/branch:dir/  directory listing of dir in branch, tree view

Possible shortcuts:
* project/branch:      directory listing of branch, main tree view
* project/:file        file in HEAD (raw)
* project/:dir/        directory listing of dir in HEAD
* project/:            directory listing of project's HEAD