ReadFile reads the file named by path from fs and returns the contents.

DirEntry describes a directory entry.

FuncDoc is the documentation for a func declaration, either a top-level function or a method function.

PackageDoc is the documentation for an entire package.

TypeDoc is the documentation for a declared type.

ValueDoc is the documentation for a group of declared values, either vars or consts.

The FileSystem interface specifies the methods godoc is using to access the file system for which it serves documentation.