Commits on Aug 7, 2018

1. Move extern_crate_name to Resolve

   

   matklad committed Aug 7, 2018
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2. Add rename info to Cargo metadata …

   Previously, `cargo metadata` exposed dependencies info as a graph of
   package id without any additional information on edges.
   
   However, we do want to add some data to edges, including for example,
   package renames and `cfg` info.
   
   Internally, the edges info is represented as a `Vec<Dependnecy>`. We
   could have exposed that directly, but that risks exposing and
   ossifying an implementation details.
   
   So instead we collapse a `Vec<Dependnecy>` to a single JSON object,
   which at the moment contains `id` and `rename` info only. It should be
   possible to add additional fields to that object backwards compatibly.
   Such representation does not correspond directly to any internal Cargo
   data structure, but hopefully it shouldn't be to hard to maintain.
   
   This representation also does not quite correspond to the "real
   world", where dependencies are between crate (cargo targets), and not
   packages. However, because each dep edge is a JSON object, adding a
   target filter should be possible, which would handle dev-, build-, and
   potential future bin-specific dependencies backwards-compatibly.

   

   matklad committed Aug 7, 2018
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