cargo-modules

Synopsis

A cargo plugin for showing a tree-like overview of a crate's modules.

Motivation

With time, as your Rust projects grow bigger and bigger, it gets more and more important to properly structure your code. Fortunately Rust provides us with a quite sophisticated module system, allowing us to neatly split up our crates into arbitrarily small sub-modules of types and functions. While this helps to avoid monolithic and unstructured chunks of code, it can also make it hard at times to still mentally stay on top of the over-all high-level structure of the project at hand.

This is where cargo-modules comes into play:

Installation

Install cargo-modules on nightly via:

bash cargo install cargo-modules

Or using rustup's ad-hoc mode:

bash rustup run nightly cargo install cargo-modules

Or if you want to build it locally:

bash $ rustup run nightly cargo build --release

Usage

cargo-modules requires nightly to run. As such unless you already are using nightly you need to either run this rustup command once, to set the default toolchain to nightly:

bash rustup default nightly

… or override the toolchain for the current directory (again, once):

bash rustup override set nightly

To then be able to just call cargo-modules through:

bash cargo modules <options>

Or if you want to stay on the beta or stable toolchain you would have to call cargo-modules through:

bash rustup run nightly cargo modules <options>

Orphaned Modules

If you want to also list of potentially orphaned modules, then add a --orphans argument:

bash cargo modules --orphans

Any file src/../foo.rs or src/../foo/mod.rs that is not linked by its super-module via mod foo; is considered a (potential) orphaned module.

To keep false positives to a minimum cargo-modules excludes all build scripts as well as lib.rs and main.rs from the selection of potential orphans.

Plain Mode

If you, for some reason, need to remove the coloring, use:

bash cargo modules --plain

Dot mode

If you also want to see which modules depends on which other modules, you can use dot mode to output Graphviz DOT compatible output.

bash cargo modules --dot

As extra options you can toggle external types/modules, conditional modules and used types using the --external, --conditional and --types options respectively.

Legend

• Green nodes are public modules.
• Yellow nodes are private modules.
• Black nodes are external types or modules.

• Dotted nodes are conditional (test modules for example).

• Black edges denote a 'is sub module of' relation.

• Yellow/Green edges denote a 'use something of module' relation
  The width of the edge is determined by the number of types used. If types are enabled the edge label shows the types used Green means the use is public, yellow means the use is private.

Help

If you need any further help:

bash cargo modules --help

Contributing

Please read CONTRIBUTING.md for details on our code of conduct,
and the process for submitting pull requests to us.

Versioning

We use SemVer for versioning. For the versions available, see the tags on this repository.

Authors

• Vincent Esche – Initial work – Regexident

See also the list of contributors who participated in this project.

License

This project is licensed under the MPL-2.0 – see the LICENSE.md file for details.