Add a rustc version segment with multiple install options

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Open hansl opened 2 years ago

hansl commented 2 years ago

This adds 4 options for rustc (if installed):

By default, will never show the rustc version segment.
always will always show the version.
yes will show the version of rustc if we can locate the Cargo.toml file (using cargo locate-project).
diff will show the version if there's a different result than the global rustc (as ran in the root). This is useful when using .rust-toolchain files to enforce specific version of the toolchain, for example.

hansl commented 2 years ago

Show, not just tell:

hansl commented 2 years ago

@bobthecow This is ready to review when you want, and has been rebased on laster master branch. Thanks!

hansl commented 2 years ago

How expensive are cargo lookups? Can we default to on if rustc is present?

This is a cold run, it stabilizes between 50-70 msecs. Not sure why (file lookup to see if it needs to forward to another rustc, likely).

hansl commented 2 years ago

PTAL.

hansl commented 2 years ago

Ping, @bobthecow

hansl commented 1 year ago

@bobthecow Ping. I have additional changes that I would like to submit a PR for, but they're based on this and don't want to pollute your queue.