cargo-real-deps

About

Cargo subcommand to check which crates are built depending on features.

The Cargo.lock file indicates the entire list of dependencies, but some of those might not be built depending on the platform or the set of features you have chosen. This tool will give you the actual list of dependencies, their version and the activated features depending on how you build it.

As an example, here is the dependency list generated for a normal build of nom:

$ cargo-real-deps /path/to/nom/Cargo.toml
cfg-if 0.1.9 {}
semver-parser 0.7.0 {}
semver 0.9.0 {"default"}
rustc_version 0.2.3 {}
ryu 1.0.0 {}
void 1.0.2 {}
unreachable 1.0.0 {}
stackvector 1.0.6 {"std", "default"}
static_assertions 0.3.4 {}
lexical-core 0.4.3 {"correct", "ryu", "stackvector", "table", "std", "default"}
memchr 2.2.1 {"use_std"}
version_check 0.1.5 {}
nom 5.0.1 {"default", "std", "lexical", "lexical-core", "alloc"}

But if you wanted to see which dependencies are built when in "no std":

$ cargo-real-deps /path/to/nom/Cargo.toml --no-default-features
memchr 2.2.1 {}
version_check 0.1.5 {}
nom 5.0.1 {}

You can also specify exactly the features you want with the option --features=feature1,feature2,etc

Installing

cargo-real-deps can be installed with cargo install:

cargo install cargo-real-deps

Usage

USAGE:
    cargo-real-deps [FLAGS] [OPTIONS] --path <path>

FLAGS:
        --all-features           activate all features
    -h, --help                   Prints help information
        --no-default-features    deactivate default features
    -V, --version                Prints version information

OPTIONS:
        --features <features>    activates some features
    -p, --path <path>            path to Cargo.toml