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Añade guía de mdBook como referencia para PageTop

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# Configuration
This section details the configuration options available in the ***book.toml***:
- **[General]** configuration including the `book`, `rust`, `build` sections
- **[Preprocessor]** configuration for default and custom book preprocessors
- **[Renderer]** configuration for the HTML, Markdown and custom renderers
- **[Environment Variable]** configuration for overriding configuration options in your environment
[General]: general.md
[Preprocessor]: preprocessors.md
[Renderer]: renderers.md
[Environment Variable]: environment-variables.md

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# Environment Variables
All configuration values can be overridden from the command line by setting the
corresponding environment variable. Because many operating systems restrict
environment variables to be alphanumeric characters or `_`, the configuration
key needs to be formatted slightly differently to the normal `foo.bar.baz` form.
Variables starting with `MDBOOK_` are used for configuration. The key is created
by removing the `MDBOOK_` prefix and turning the resulting string into
`kebab-case`. Double underscores (`__`) separate nested keys, while a single
underscore (`_`) is replaced with a dash (`-`).
For example:
- `MDBOOK_foo` -> `foo`
- `MDBOOK_FOO` -> `foo`
- `MDBOOK_FOO__BAR` -> `foo.bar`
- `MDBOOK_FOO_BAR` -> `foo-bar`
- `MDBOOK_FOO_bar__baz` -> `foo-bar.baz`
So by setting the `MDBOOK_BOOK__TITLE` environment variable you can override the
book's title without needing to touch your `book.toml`.
> **Note:** To facilitate setting more complex config items, the value of an
> environment variable is first parsed as JSON, falling back to a string if the
> parse fails.
>
> This means, if you so desired, you could override all book metadata when
> building the book with something like
>
> ```shell
> $ export MDBOOK_BOOK="{'title': 'My Awesome Book', authors: ['Michael-F-Bryan']}"
> $ mdbook build
> ```
The latter case may be useful in situations where `mdbook` is invoked from a
script or CI, where it sometimes isn't possible to update the `book.toml` before
building.

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# General Configuration
You 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:
```toml
[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 metadata
This is general information about your book.
- **title:** The title of the book
- **authors:** The author(s) of the book
- **description:** A description for the book, which is added as meta
information in the html `<head>` of each page
- **src:** By default, the source directory is found in the directory named
`src` directly under the root folder. But this is configurable with the `src`
key in the configuration file.
- **language:** The main language of the book, which is used as a language attribute `<html lang="en">` for example.
**book.toml**
```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"
```
### Rust options
Options for the Rust language, relevant to running tests and playground
integration.
```toml
[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` or `edition2021` annotations, such as:
~~~text
```rust,edition2015
// This only works in 2015.
let try = true;
```
~~~
### Build options
This controls the build process of your book.
```toml
[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
```
- **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.
- For clarity, with no preprocessor configuration, the default `links` and
`index` will run.
- Setting `use-default-preprocessors = false` will disable these
default preprocessors from running.
- Adding `[preprocessor.links]`, for example, will ensure, regardless of
`use-default-preprocessors` that `links` it will run.

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# Configuring Preprocessors
Preprocessors are extensions that can modify the raw Markdown source before it gets sent to the renderer.
The following preprocessors are built-in and included by default:
- `links`: Expands the `{{ #playground }}`, `{{ #include }}`, and `{{ #rustdoc_include }}` handlebars
helpers in a chapter to include the contents of a file.
See [Including files] for more.
- `index`: Convert all chapter files named `README.md` into `index.md`. That is
to say, all `README.md` would be rendered to an index file `index.html` in the
rendered book.
The built-in preprocessors can be disabled with the [`build.use-default-preprocessors`] config option.
The community has developed several preprocessors.
See the [Third Party Plugins] wiki page for a list of available preprocessors.
For information on how to create a new preprocessor, see the [Preprocessors for Developers] chapter.
[Including files]: ../mdbook.md#including-files
[`build.use-default-preprocessors`]: general.md#build-options
[Third Party Plugins]: https://github.com/rust-lang/mdBook/wiki/Third-party-plugins
[Preprocessors for Developers]: ../../for_developers/preprocessors.md
## Custom Preprocessor Configuration
Preprocessors can be added by including a `preprocessor` table in `book.toml` with the name of the preprocessor.
For example, if you have a preprocessor called `mdbook-example`, then you can include it with:
```toml
[preprocessor.example]
```
With this table, mdBook will execute the `mdbook-example` preprocessor.
This table can include additional key-value pairs that are specific to the preprocessor.
For example, if our example prepocessor needed some extra configuration options:
```toml
[preprocessor.example]
some-extra-feature = true
```
## Locking a Preprocessor dependency to a renderer
You can explicitly specify that a preprocessor should run for a renderer by
binding the two together.
```toml
[preprocessor.example]
renderers = ["html"] # example preprocessor only runs with the HTML renderer
```
## Provide Your Own Command
By default when you add a `[preprocessor.foo]` table to your `book.toml` file,
`mdbook` will try to invoke the `mdbook-foo` executable. If you want to use a
different program name or pass in command-line arguments, this behaviour can
be overridden by adding a `command` field.
```toml
[preprocessor.random]
command = "python random.py"
```
## Require A Certain Order
The order in which preprocessors are run can be controlled with the `before` and `after` fields.
For example, suppose you want your `linenos` preprocessor to process lines that may have been `{{#include}}`d; then you want it to run after the built-in `links` preprocessor, which you can require using either the `before` or `after` field:
```toml
[preprocessor.linenos]
after = [ "links" ]
```
or
```toml
[preprocessor.links]
before = [ "linenos" ]
```
It would also be possible, though redundant, to specify both of the above in the same config file.
Preprocessors having the same priority specified through `before` and `after` are sorted by name.
Any infinite loops will be detected and produce an error.

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# Configuring Renderers
Renderers (also called "backends") are responsible for creating the output of the book.
The following backends are built-in:
* [`html`](#html-renderer-options) — This renders the book to HTML.
This is enabled by default if no other `[output]` tables are defined in `book.toml`.
* [`markdown`](#markdown-renderer) — This outputs the book as markdown after running the preprocessors.
This is useful for debugging preprocessors.
The community has developed several backends.
See the [Third Party Plugins] wiki page for a list of available backends.
For information on how to create a new backend, see the [Backends for Developers] chapter.
[Third Party Plugins]: https://github.com/rust-lang/mdBook/wiki/Third-party-plugins
[Backends for Developers]: ../../for_developers/backends.md
## Output tables
Backends can be added by including a `output` table in `book.toml` with the name of the backend.
For example, if you have a backend called `mdbook-wordcount`, then you can include it with:
```toml
[output.wordcount]
```
With this table, mdBook will execute the `mdbook-wordcount` backend.
This table can include additional key-value pairs that are specific to the backend.
For example, if our example backend needed some extra configuration options:
```toml
[output.wordcount]
ignores = ["Example Chapter"]
```
If you define any `[output]` tables, then the `html` backend is not enabled by default.
If you want to keep the `html` backend running, then just include it in the `book.toml` file.
For example:
```toml
[book]
title = "My Awesome Book"
[output.wordcount]
[output.html]
```
If more than one `output` table is included, this changes the behavior for the layout of the output directory.
If there is only one backend, then it places its output directly in the `book` directory (see [`build.build-dir`] to override this location).
If there is more than one backend, then each backend is placed in a separate directory underneath `book`.
For example, the above would have directories `book/html` and `book/wordcount`.
[`build.build-dir`]: general.md#build-options
### Custom backend commands
By default when you add an `[output.foo]` table to your `book.toml` file,
`mdbook` will try to invoke the `mdbook-foo` executable.
If you want to use a different program name or pass in command-line arguments,
this behaviour can be overridden by adding a `command` field.
```toml
[output.random]
command = "python random.py"
```
### Optional backends
If you enable a backend that isn't installed, the default behavior is to throw an error.
This behavior can be changed by marking the backend as optional:
```toml
[output.wordcount]
optional = true
```
This demotes the error to a warning.
## HTML renderer options
The HTML renderer has a variety of options detailed below.
They should be specified in the `[output.html]` table of the `book.toml` file.
```toml
# Example book.toml file with all output options.
[book]
title = "Example book"
authors = ["John Doe", "Jane Doe"]
description = "The example book covers examples."
[output.html]
theme = "my-theme"
default-theme = "light"
preferred-dark-theme = "navy"
curly-quotes = true
mathjax-support = false
copy-fonts = true
additional-css = ["custom.css", "custom2.css"]
additional-js = ["custom.js"]
no-section-label = false
git-repository-url = "https://github.com/rust-lang/mdBook"
git-repository-icon = "fa-github"
edit-url-template = "https://github.com/rust-lang/mdBook/edit/master/guide/{path}"
site-url = "/example-book/"
cname = "myproject.rs"
input-404 = "not-found.md"
```
The following configuration options are available:
- **theme:** mdBook comes with a default theme and all the resource files needed
for it. But if this option is set, mdBook will selectively overwrite the theme
files with the ones found in the specified folder.
- **default-theme:** The theme color scheme to select by default in the
'Change Theme' dropdown. Defaults to `light`.
- **preferred-dark-theme:** The default dark theme. This theme will be used if
the browser requests the dark version of the site via the
['prefers-color-scheme'](https://developer.mozilla.org/en-US/docs/Web/CSS/@media/prefers-color-scheme)
CSS media query. Defaults to `navy`.
- **curly-quotes:** Convert straight quotes to curly quotes, except for those
that occur in code blocks and code spans. Defaults to `false`.
- **mathjax-support:** Adds support for [MathJax](../mathjax.md). Defaults to
`false`.
- **copy-fonts:** Copies fonts.css and respective font files to the output directory and use them in the default theme. Defaults to `true`.
- **google-analytics:** This field has been deprecated and will be removed in a future release.
Use the `theme/head.hbs` file to add the appropriate Google Analytics code instead.
- **additional-css:** If you need to slightly change the appearance of your book
without overwriting the whole style, you can specify a set of stylesheets that
will be loaded after the default ones where you can surgically change the
style.
- **additional-js:** If you need to add some behaviour to your book without
removing the current behaviour, you can specify a set of JavaScript files that
will be loaded alongside the default one.
- **no-section-label:** mdBook by defaults adds numeric section labels in the table of
contents column. For example, "1.", "2.1". Set this option to true to disable
those labels. Defaults to `false`.
- **git-repository-url:** A url to the git repository for the book. If provided
an icon link will be output in the menu bar of the book.
- **git-repository-icon:** The FontAwesome icon class to use for the git
repository link. Defaults to `fa-github` which looks like <i class="fa fa-github"></i>.
If you are not using GitHub, another option to consider is `fa-code-fork` which looks like <i class="fa fa-code-fork"></i>.
- **edit-url-template:** Edit url template, when provided shows a
"Suggest an edit" button (which looks like <i class="fa fa-edit"></i>) for directly jumping to editing the currently
viewed page. For e.g. GitHub projects set this to
`https://github.com/<owner>/<repo>/edit/master/{path}` or for
Bitbucket projects set it to
`https://bitbucket.org/<owner>/<repo>/src/master/{path}?mode=edit`
where {path} will be replaced with the full path of the file in the
repository.
- **input-404:** The name of the markdown file used for missing files.
The corresponding output file will be the same, with the extension replaced with `html`.
Defaults to `404.md`.
- **site-url:** The url where the book will be hosted. This is required to ensure
navigation links and script/css imports in the 404 file work correctly, even when accessing
urls in subdirectories. Defaults to `/`.
- **cname:** The DNS subdomain or apex domain at which your book will be hosted.
This string will be written to a file named CNAME in the root of your site, as
required by GitHub Pages (see [*Managing a custom domain for your GitHub Pages
site*][custom domain]).
[custom domain]: https://docs.github.com/en/github/working-with-github-pages/managing-a-custom-domain-for-your-github-pages-site
### `[output.html.print]`
The `[output.html.print]` table provides options for controlling the printable output.
By default, mdBook will include an icon on the top right of the book (which looks like <i class="fa fa-print"></i>) that will print the book as a single page.
```toml
[output.html.print]
enable = true # include support for printable output
page-break = true # insert page-break after each chapter
```
- **enable:** Enable print support. When `false`, all print support will not be
rendered. Defaults to `true`.
- **page-break** Insert page breaks between chapters. Defaults to `true`.
### `[output.html.fold]`
The `[output.html.fold]` table provides options for controlling folding of the chapter listing in the navigation sidebar.
```toml
[output.html.fold]
enable = false # whether or not to enable section folding
level = 0 # the depth to start folding
```
- **enable:** Enable section-folding. When off, all folds are open.
Defaults to `false`.
- **level:** The higher the more folded regions are open. When level is 0, all
folds are closed. Defaults to `0`.
### `[output.html.playground]`
The `[output.html.playground]` table provides options for controlling Rust sample code blocks, and their integration with the [Rust Playground].
[Rust Playground]: https://play.rust-lang.org/
```toml
[output.html.playground]
editable = false # allows editing the source code
copyable = true # include the copy button for copying code snippets
copy-js = true # includes the JavaScript for the code editor
line-numbers = false # displays line numbers for editable code
runnable = true # displays a run button for rust code
```
- **editable:** Allow editing the source code. Defaults to `false`.
- **copyable:** Display the copy button on code snippets. Defaults to `true`.
- **copy-js:** Copy JavaScript files for the editor to the output directory.
Defaults to `true`.
- **line-numbers** Display line numbers on editable sections of code. Requires both `editable` and `copy-js` to be `true`. Defaults to `false`.
- **runnable** Displays a run button for rust code snippets. Changing this to `false` will disable the run in playground feature globally. Defaults to `true`.
[Ace]: https://ace.c9.io/
### `[output.html.search]`
The `[output.html.search]` table provides options for controlling the built-in text [search].
mdBook must be compiled with the `search` feature enabled (on by default).
[search]: ../../guide/reading.md#search
```toml
[output.html.search]
enable = true # enables the search feature
limit-results = 30 # maximum number of search results
teaser-word-count = 30 # number of words used for a search result teaser
use-boolean-and = true # multiple search terms must all match
boost-title = 2 # ranking boost factor for matches in headers
boost-hierarchy = 1 # ranking boost factor for matches in page names
boost-paragraph = 1 # ranking boost factor for matches in text
expand = true # partial words will match longer terms
heading-split-level = 3 # link results to heading levels
copy-js = true # include Javascript code for search
```
- **enable:** Enables the search feature. Defaults to `true`.
- **limit-results:** The maximum number of search results. Defaults to `30`.
- **teaser-word-count:** The number of words used for a search result teaser.
Defaults to `30`.
- **use-boolean-and:** Define the logical link between multiple search words. If
true, all search words must appear in each result. Defaults to `false`.
- **boost-title:** Boost factor for the search result score if a search word
appears in the header. Defaults to `2`.
- **boost-hierarchy:** Boost factor for the search result score if a search word
appears in the hierarchy. The hierarchy contains all titles of the parent
documents and all parent headings. Defaults to `1`.
- **boost-paragraph:** Boost factor for the search result score if a search word
appears in the text. Defaults to `1`.
- **expand:** True if search should match longer results e.g. search `micro`
should match `microwave`. Defaults to `true`.
- **heading-split-level:** Search results will link to a section of the document
which contains the result. Documents are split into sections by headings this
level or less. Defaults to `3`. (`### This is a level 3 heading`)
- **copy-js:** Copy JavaScript files for the search implementation to the output
directory. Defaults to `true`.
### `[output.html.redirect]`
The `[output.html.redirect]` table provides a way to add redirects.
This is useful when you move, rename, or remove a page to ensure that links to the old URL will go to the new location.
```toml
[output.html.redirect]
"/appendices/bibliography.html" = "https://rustc-dev-guide.rust-lang.org/appendix/bibliography.html"
"/other-installation-methods.html" = "../infra/other-installation-methods.html"
```
The table contains key-value pairs where the key is where the redirect file needs to be created, as an absolute path from the build directory, (e.g. `/appendices/bibliography.html`).
The value can be any valid URI the browser should navigate to (e.g. `https://rust-lang.org/`, `/overview.html`, or `../bibliography.html`).
This will generate an HTML page which will automatically redirect to the given location.
Note that the source location does not support `#` anchor redirects.
## Markdown Renderer
The Markdown renderer will run preprocessors and then output the resulting
Markdown. This is mostly useful for debugging preprocessors, especially in
conjunction with `mdbook test` to see the Markdown that `mdbook` is passing
to `rustdoc`.
The Markdown renderer is included with `mdbook` but disabled by default.
Enable it by adding an empty table to your `book.toml` as follows:
```toml
[output.markdown]
```
There are no configuration options for the Markdown renderer at this time;
only whether it is enabled or disabled.
See [the preprocessors documentation](preprocessors.md) for how to
specify which preprocessors should run before the Markdown renderer.