Option for `cargo tree` to filter out (non-)workspace members

zeichenreihe commented 4 weeks ago

Problem

I'm opening this issue because https://github.com/rust-lang/cargo/issues/8105#issuecomment-1284860085 said to open one if one wanted that feature.

cargo tree allows with --prune to remove dependencies from the list. However, as mentioned in https://github.com/rust-lang/cargo/issues/8105#issuecomment-846336129 it only takes in SPEC, and not the proposed "non-members" or "members".

This would be useful to have, since it would allow easily viewing the dependency tree with only workspace members.

Proposed Solution

The solution would be adding some argument, that would then take the values both, member, and non-member (as mentioned in https://github.com/rust-lang/cargo/issues/8105#issuecomment-846336129).

I have no proposed name yet for the argument.

Notes

At the time of writing, there does not exist any such command, see https://github.com/rust-lang/cargo/blob/ba8b39413c74d08494f94a7542fe79aa636e1661/src/doc/src/commands/cargo-tree.md for the cargo tree documentation at the time of writing.

epage commented 4 weeks ago

This would be useful to have, since it would allow easily viewing the dependency tree with only workspace members.

Could you go into more detail on the use case for this? In what scenarios are you wanting to view a tree of only workspace members?

zeichenreihe commented 4 weeks ago

Scenarios:

you want to commit your changes to different crates independently of each other, while not creating commits that "reference api from future commits"
you want to make a "how the crates here depend on each other" graph to help new contributors

I think the latter justifies it even more.

Yes it's currently possible to even get the same result, but this requires listing all the dependencies of all crates with --prune, which is annoying and doesn't scale well.

rust-lang / cargo