Package build 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 follow implements remote connections to other plz processes.

Package fs provides various filesystem helpers.

Package gc implements "garbage collection" logic for Please, which is an attempt to identify targets in the repo that are no longer needed.

Package help prints help messages about parts of plz.

Package metrics contains support for reporting metrics to an external server, currently a Prometheus pushgateway.

Package parse implements parsing of the BUILD files via an embedded Python interpreter.

Package query implements a simple query language for Please.

Package run implements the "plz run" command.

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

Package update contains code for Please auto-updating itself.

Package utils contains various utility functions and whatnot.

Package watch provides a filesystem watcher that is used to rebuild affected targets.

Please starts & runs the main build process through to its completion.

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