This PR adds an `--update` flag to the `tree-sitter test` command, which adds the ability to replace the _expected_ output in the corpus.txt with the _actual_ output produced by the parser, that is, we can now simply use this `--update` flag to write all the corresponding parser output back to the corpus.txt, and we just need to check the output without typing its actual sexp.
- use the same output format as `tree-sitter parse`, except there won't be any position information printed.
- the corpus.txt won't be touched if there's no difference between the _expected_ output and the _actual_ output in that file.
- if there're differences between _expected_ and _actual_, _expected_ will be replaced by _actual_ and the whole file will be reformatted, i.e., all the output sexp will be formatted just like the output from `tree-sitter parse` and all the delimiters `===`/`---` will be normalized as 80-column long.
- this flag also works with `--filter` flag.
This PR adds an `--update` flag to the `tree-sitter test` command, which adds the ability to replace the _expected_ output in the corpus.txt with the _actual_ output produced by the parser, that is, we can now simply use this `--update` flag to write all the corresponding parser output back to the corpus.txt, and we just need to check the output without typing its actual sexp.
- use the same output format as `tree-sitter parse`, except there won't be any position information printed.
- the corpus.txt won't be touched if there's no difference between the _expected_ output and the _actual_ output in that file.
- if there're differences between _expected_ and _actual_, only the test case that is different will be replaced, the rest test cases will stay as-is. (All the delimiters `===`/`---` will be normalized as 80-column long, though.)
- this flag also works with `--filter` flag.
Right now this is just used for two things:
* Specifying folders for locarting parsers to use with `tree-sitter
parse` and `tree-sitter highlight`
* Specifying colors to use for `tree-sitter-highlight`
* Structure `cli` crate as both a library and an executable, so that
benchmarks can import code from the crate.
* Import macros in the Rust 2018 style.
