I mainly resolved some circular dependencies that had crept in, and
moved code around. I renamed helper.rs because that was not really an
appropriate name anymore, and moved the delegate code into a new module.
The "Installed App Flow" requires user interaction; we first generate a
URL that the user has to navigate to. Then, the user either pastes a
displayed code into the app being authorized, or the OAuth provider
redirects the user's browser to a webserver that is running on
localhost. This webserver is provided by the library and the flow should
work automatically. Extensive documentation can be found here:
https://developers.google.com/identity/protocols/OAuth2InstalledApp
An example for the InstalledFlow with the Drive API is here:
https://gist.github.com/dermesser/8c915ec4c88ee8e8927e7d40b276ca52
* Previously the meta-data was applied to the crate, which doesn't seem
to work.
* attempted to make `examples/auth.rs` work on stable. This isn't
properly tested now, as tests don't compile.
We are now at a state were stable as well as nightly work similarly,
but fail because `include!` doesn't behave correctly if macros are
involved. Namely it happens before crates are linked, yet it will
try to expand macros right away, which is a problem.
If the macro is defined in an empty fashion, it will actually be used
at include time, and expanded. Which causes issues further down the
compilation.
With the current 'fix' we manage to at least make everything but
`cargo test` work.
Related to #12
* It should help to keep track of how to properly call cargo in nightly
mode. After all, I have wasted some time, multiple times just trying
to figure out that I forgot to add the nightly feature.
* Slightly improved structure of lib.rs and includes
Related to #12
It doesn't yet work on nightly due to a panic in
https://goo.gl/RyM4GT
Might have something to do with me being on nightly,
and some cargo-related hickoup.
