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cargo review-deps update-diff -d diff -- --package foo --precise 1.2.3 should put the before/after snapshots of the packages that would be changed by cargo update --pacakge foo --precise 1.2.3 command, without doing the actual update.

implementation:

• run cargo metadata once to learn about current state
• remember Cargo.lock
• run cargo update, forwarding args.
• parse update's output to learn about changes (alternatively, diff metadatas?)
• run cargo metadata again, to learn about the new state
• restore old Cargo.lock
• dump the diff to dest dir.

In order to review changes more easily, it might be nice to have an "output to html" feature

Some dependencies take a bit to load. It might be good to give some kind of feedback to the user that work is in progress.

cargo review-deps current -d deps should dump sources of all dependencies to the deps directory to ease review.

Implementation: run cargo metadata once, then copy each package whose source is crates.io.

I want to compare the dependencies of two branches with radically different dependencies (in this case, deadlinks/cargo-deadlinks#86). However, I don't see a way to compare the Cargo.lock of each branch - I have to be able to replicate the change with a single cargo update command, which isn't possible in my case because these are different crates altogether. It would be great to diff the lockfiles themselves. Right now I'm using cargo tree on each and diffing the output, but it's a little hard to read.