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General ConfigurationYou can configure the parameters for your book in the book.toml file.
Here is an example of what a book.toml file might look like:
[book]
title = "Example book"
authors = ["John Doe"]
description = "The example book covers examples."
[rust]
edition = "2018"
[build]
build-dir = "my-example-book"
create-missing = false
[preprocessor.index]
[preprocessor.links]
[output.html]
additional-css = ["custom.css"]
[output.html.search]
limit-results = 15
Supported configuration options
It is important to note that any relative path specified in the configuration will always be taken relative from the root of the book where the configuration file is located.
General metadataThis is general information about your book.
<head>
of each pagesrc
directly under the root folder. But this is configurable with the src
key in the configuration file.<html lang="en">
for example. This is also used to derive the direction of text (RTL, LTR) within the book.ltr
, rtl
. When not specified, the text direction is derived from the book’s language
attribute.book.toml
[book]
title = "Example book"
authors = ["John Doe", "Jane Doe"]
description = "The example book covers examples."
src = "my-src" # the source files will be found in `root/my-src` instead of `root/src`
language = "en"
text-direction = "ltr"
Rust options
Options for the Rust language, relevant to running tests and playground integration.
[rust]
edition = "2015" # the default edition for code blocks
edition: Rust edition to use by default for the code snippets. Default is "2015"
. Individual code blocks can be controlled with the edition2015
, edition2018
, edition2021
or edition2024
annotations, such as:
```rust,edition2015
// This only works in 2015.
let try = true;
```
This controls the build process of your book.
[build]
build-dir = "book" # the directory where the output is placed
create-missing = true # whether or not to create missing pages
use-default-preprocessors = true # use the default preprocessors
extra-watch-dirs = [] # directories to watch for triggering builds
build-dir: The directory to put the rendered book in. By default this is book/
in the book’s root directory. This can overridden with the --dest-dir
CLI option.
create-missing: By default, any missing files specified in SUMMARY.md
will be created when the book is built (i.e. create-missing = true
). If this is false
then the build process will instead exit with an error if any files do not exist.
use-default-preprocessors: Disable the default preprocessors (of links
& index
) by setting this option to false
.
If you have the same, and/or other preprocessors declared via their table of configuration, they will run instead.
links
and index
will run.use-default-preprocessors = false
will disable these default preprocessors from running.[preprocessor.links]
, for example, will ensure, regardless of use-default-preprocessors
that links
it will run.extra-watch-dirs: A list of paths to directories that will be watched in the watch
and serve
commands. Changes to files under these directories will trigger rebuilds. Useful if your book depends on files outside its src
directory.
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