package builder can be used in testing to create a temporary go module or gopath, src, namespace and package directory, and populate it with source files.

Package vos is a virtual os tool.

Dir returns the filesystem path for the directory corresponding to the go package path provided.

Dirs returns the filesystem path for all packages under the directory corresponding to the go package path provided.

Name returns the package name for a given path and src dir.

NewCache returns a new *Cache, allowing cached access to patsy utility functions.

Path returns the go package path corresponding to the filesystem directory provided.

Cache supports patsy.Dir and patsy.Path, but cached so they can be used in tight loops without hammering the filesystem.

PackageSpec identifies a package by dir and path.

Setup holds globals, environment and command line flags for the courtney command.