ParseAll parses all arguments and returns a slice of Proj objects.

ParseOne parses the first argument and returns a Proj object If the first argument is a file, it continues to parse subsequent arguments.

ErrMixedFilesProj is returned when a project contains both files and non-files.

DirProj represents a project with a directory.

FilesProj represents a project with files.

PkgPathProj represents a project with a package path.

Proj is the interface for a project.