Consider publishing format_changeset as a crate

[killercup]

I just copied format_changeset.rs verbatim into a repo (cf. rust-lang/rust-clippy#2384) to get your fancy diff output without the assert/panic part :)

Maybe it'd make sense to create at difference-formatters crate that contains, well, some formatters for text diffs using difference?

[colin-kiegel]

Sorry for answering late. Sounds reasonable, but so don't want to maintain another crate right now.

But if anyone else out there does, I would consider using this as a dependency. :-)

[CAD97]

I just published colored-diff. [GitHub]

Currently it just handles the case of formatting the difference between two &str, but I can make the function that takes a difference::Changeset public if that's necessary for it to be used here.

[sanmai-NL]

Note to all: why is this useful? Because unit tests can now return Results, not only panick.