forked from extern/nushell
6a7c00eaef
This commit should finish the `coloring_in_tokens` feature, which moves the shape accumulator into the token stream. This allows rollbacks of the token stream to also roll back any shapes that were added. This commit also adds a much nicer syntax highlighter trace, which shows all of the paths the highlighter took to arrive at a particular coloring output. This change is fairly substantial, but really improves the understandability of the flow. I intend to update the normal parser with a similar tracing view. In general, this change also fleshes out the concept of "atomic" token stream operations. A good next step would be to try to make the parser more error-correcting, using the coloring infrastructure. A follow-up step would involve merging the parser and highlighter shapes themselves.