The build package houses the core functionality for actually building targets.

Package cli contains helper functions related to flag parsing and logging.

Package export handles exporting parts of the repo to other directories.

Package help prints help messages about parts of plz.

Package responsible for parsing build files and constructing build targets & the graph.

Package query implements a simple query language for Please.

Package tool implements running Please's sub-tools (via "plz tool jarcat" etc).

Package utils contains various utility functions and whatnot.

ConfigOverrides are used to implement completion on the -o flag.