This removes the macro_use for clap just because I'm not a big fan of
glob-style imports like this. I think being a little more explicit here
makes it a little clearer where these macros come from.
This switches to using the tracing crate instead of log. Tracing
provides a lot of nice features which we can take advantage of moving
forward.
This also adjusts the output fairly significantly. This includes:
- Switched the environment variable from RUST_LOG to MDBOOK_LOG.
- Dropped the timestamp. I experimented with various different time
displays, but ultimately decided to omit it for now. I don't think
I've ever found it to be useful, and it takes up a very significant
amount of space. It could potentially be useful for basic profiling,
but I think there are other, better mechanisms for that. We could
consider leveraging tracing itself for doing some basic profiling
(like using something like tracing-chrome).
- Dropped the target unless MDBOOK_LOG is set. The target tends to be
pretty noisy, and doesn't really convey much information unless you
are debugging or otherwise trying to adjust the log output.
- Added color.
- Slightly reworked the way the error cause trace is displayed.
- Slightly changed the way html5ever filtering is done, as well as add
handlebars to the list since they both are very noisy. You can
override this now by explicitly listing them as targets.
I still expect that mdbook will eventually change how it displays things
to the console, possibly switching away from tracing and printing things
itself. However, that is a larger project for the future.
This updates everything for the move of utils to mdbook-core. There will
be followup commits that will be moving and refactoring these utils.
This simply moves them over unchanged (except visibility).
By default, `opener` launches the subprocess without waiting for its
completion, compared to `open` which waits for its completion.
This is helpful in case the `watch` feature is enabled and one of the
following commands `watch | serve --open` is used. If this command would
open the browser, listening for changes would be blocked by the browser.
