Module preprocess

Book preprocessing.

Structs

• CmdPreprocessor
  A custom preprocessor which will shell out to a 3rd-party program.
• IndexPreprocessor
  A preprocessor for converting file name README.md to index.md since README.md is the de facto index file in markdown-based documentation.
• LinkPreprocessor
  A preprocessor for expanding helpers in a chapter. Supported helpers are:
• PreprocessorContext
  Extra information for a Preprocessor to give them more context when processing a book.

Traits

• Preprocessor
  An operation which is run immediately after loading a book into memory and before it gets rendered.