This commit removes all distributed executables except for `cargo`. All
builtin subcommands are implemented through library calls, and the fallback
methods are retained to maintain extensability through new subcommands.
Closes#393
In general relying on external programs is dicey and tricky as they're very
different across systems in both how they're used as well as what versions
you'll find. Instead of binding to the least common denominator of CLI, we can
code against an exact version of libgit2.
This introduces a build-time dependency on cmake which libgit2 requires to build
itself, which is unfortunate, but thankfully it's only a build time dep. The
build process for libgit2 also automatically detects as many system libraries as
possible to use (if available), falling back to bundled versions if not
available. I have currently not figured how to control this, so the link-config
package is used to build libgit2 which requires that pkg-config be installed to
build cargo as well.
Closes#138
The hammer library currently has some shortcomings such as the inability to
document individual options. Additionally our handling with hammer of extra
arguments is dodgy at best currently.
This commit moves the repository to BurntSushi's docopt.rs library which seems
to more feature-complete at this time. Additionally, docopt has the great
benefit of a "document once, use everywhere" documentation strategy.
This migration solves two primary issues:
* Comprehensive and useful CLI documentation
* Gracefully handling flavorful combinations of arguments in odd combinations
Closes#218
