Please support running standalone

[joshtriplett]

cargo-tree expects to find a local Cargo.toml file. Please consider adding support for running on a named package directly from the registry: cargo tree somecrate.

[sfackler]

This seems reasonable.

@alexcrichton any pointers on where to look in the cargo APIs? I need "download this pkgspec and well me where its directory is".

[alexcrichton]

@sfackler you'd do something like this:

• You'd create a Config
• You'd create a SourceId
• Create a RegistrySource
• Update the registry source.
• Create a Dependency matching the crate you're curious about
• Query the registry source

That'll give you one layer and you could apply that recursively.

If, instead, you'd like to work with a Resolve (like you're probably doing today), it'd be a little different:

• Create a synthetic Summary with a dummy package id, one dependency (the one you're interested in), and no features.
• Call resolve with this summary, no replacements, and a blank registry, probably a PackageRegistry

Does that make sense?

[sfackler]

Yep, thanks!

[equal-l2]

Hello, any update for this?