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Hacking Humility

This file is intended to collect recipes and procedures for working on Humility, oriented toward the casual or intermittent contributor.

Mostly Cargo Just Works

cargo build and cargo test will both do the thing you expect.

On Linux, libudev and pkg-config will need to be installed from your distro's package manager, if they are not already present on your system.

Bumping the crate version requires an extra step

The Humility version appears in a bunch of golden files recording known-good command output. As a result, if you change the crate version in Cargo.toml, the tests will fail.

With the version change as the only change in your checkout, so that you're not introducing other churn to the golden changes, you can safely just run:

TRYCMD_TEST="tests/cmd/*trycmd" TRYCMD=overwrite cargo test

and it'll fix the files. Check the diff to make sure you didn't do anything unintended.

How to add a new subcommand

So you've decided to add a subcommand to Humility. Here's what you need to do.

  1. Add a new lib package underneath the cmd/ subdirectory. The easiest way to get all the fiddly bits right is to copy an existing one. If you do this, make sure you remember to change the package name in the Cargo.toml, and make sure any new name starts with humility-cmd- (e.g. humility-cmd-yourcommand).

  2. Review the settings in the init routine you cribbed from to make sure they reflect your subcommand. In particular, the name must appear a second time in the name: field, and kind should reflect whether you need an attached target and archive, or not.

  3. Cite your new subcommand from the root Cargo.toml. This needs to happen in three places using two different names: in the workspace.members element using the relative path (e.g. cmd/yourcommand); in the workspace.dependencies section using the name of your package with the leading humility- stripped off, so e.g. cmd-yourcommand; and then in the dependencies table with a line reading cmd-yourcommand = {workspace = true}.

  4. Regenerate the README file by running cargo xtask readme. The xtask bit there is very important.

  5. If you're adding a new command, you almost certainly want to bump Humility's patch version. This makes it easier to tell whether users have the command. Doing this requires an extra step compared to a normal Rust package; see the previous section in this file.