d7892f5601
This adds the `optional` field to the preprocessor configuration to mirror the same option for the `output` table. Missing preprocessors are now an error unless the `optional` field is set. This should help with inadvertently building a book when a missing preprocessor that you expect to be installed. |
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|---|---|---|
| .. | ||
| builtin_preprocessors | ||
| builtin_renderers | ||
| mdbook | ||
| init.rs | ||
| lib.rs | ||
| load.rs | ||
| mdbook.rs | ||