Provides better feedback if user executes in a different folder than what is expected by mdbook
After the changes `mdbook build`
```
2020-12-19 14:27:35 [ERROR] (mdbook::utils): Error: Couldn't open SUMMARY.md in "/Users/vicky/rust/source_codes/mdbook_testing/src/src" directory
2020-12-19 14:27:35 [ERROR] (mdbook::utils): Caused By: No such file or directory (os error 2)
```
Previously: `mdbook build`
```
2020-12-19 14:28:46 [ERROR] (mdbook::utils): Error: Couldn't open SUMMARY.md
2020-12-19 14:28:46 [ERROR] (mdbook::utils): Caused By: No such file or directory (os error 2)
```
Summary items that had their name split into two lines ended up with the
last word of one line and the first word of the next line glued
together, since a space wasn't added.
Added test case for it.
Fixes#1218
* Removed the itertools dependency
* Removed an unused feature flag
* Stubbed out a toml_query replacement
* Update dependencies.
* Bump env_logger.
* Use warp instead of iron for http server.
Iron does not appear to be maintained anymore. warp/hyper seems to be
reasonably maintained. Unfortunately this takes a few seconds more
to compile, but shouldn't be too bad.
One benefit is that there is no longer a need for a separate websocket
port, which makes it easier to run multiple servers at once.
* Update pulldown-cmark to 0.7
* Switch from error-chain to anyhow.
* Bump MSRV to 1.39.
* Update elasticlunr-rs.
Co-authored-by: Michael Bryan <michaelfbryan@gmail.com>
Use case: when trying to `mdbook test` a file that has many `include`
directives, and a test fails, the line numbers in the `rustdoc` output
don't match the line numbers in the original markdown file.
Turning on the markdown renderer implemented here lets you see what is
being passed to `rustdoc` by saving the markdown after the preprocessors
have run.
This renderer could be helpful for debugging many preprocessors, but
it's probably not useful in the general case, so it's turned off by
default.
* Update to pulldown-cmark 0.4.1.
* Update to pulldown-cmark 0.5.2.
* Remove pulldown-cmark-to-cmark dependency.
Since it is not compatible with the new pulldown-cmark. This example isn't
directly usable, anyways, and I think the no-op example sufficiently shows how
to make a preprocessor.
* cargo fmt
* Fix example link.
* Add if around stub summary creation
Check if an existing SUMMARY.md is present to prevent overwriting it
with the stub SUMMARY.md.
[#832]
* Add test for existing SUMMARY.md
