#![crate_name = "element_call_book"]
#![crate_type = "lib"]

//! ![Welcome to the element-call book.][element_call_book]
//!
//! This repository contains the text source for "The Element-Call" book.
//! We will further reference to it as the `Element-Call Book`.
//!
//! [element_call_book]: https://gitea.networkx.de/rzerres/element-call-book/src/branch/main/src/img/element-call-webui.png
//! <!--
//!	WIP: once it is ready to be shipped
//!	[The book is available in dead-tree form from No Starch Press][nostarch].
//!
//!	[nostarch]: https://nostarch.com/
//!
//!	You can read the book for free online. Please see the book as shipped with
//!	the latest [stable], or [develop] ELement-Call releases. Be aware that issues
//!	in those versions may have been fixed in this repository already, as those
//!	releases are updated less frequently.
//!
//!	[stable]: https://element.io/element-call/stable/book/
//!	[develop]: https://ekenebt.io/element-call/book/
//!
//!	See the [releases] to download just the code of all the code listings that appear in the book.
//!
//!	[releases]: https://element.io/element-call/book/releases
//! -->
//!
//! ### Requirements
//!
//! #### mdBook
//! Building the book requires [mdBook] and its helper tools. The used
//! version should be ideally the same that rust-lang/rust uses in
//! [this file][rust-mdbook]. Install this tools with:
//!
//! ```console
//! $ cargo install mdbook mdbook-linkchecker mdbook-mermaid
//! ```
//!
//! This command will grep the latest mdbook version from [crates.io] in
//! combination with the add-on tools mdbook-linkchecker and
//! mdbook-mermaid. With the linkchecker we are able to asure, that
//! the used links inside the markdown source can resolve to valid
//! targets. mkbook-mermaid is a preprocessor for mdbook to add
//! mermaid.js support. We do use it to create graphs that visiulize
//! some process flows.
//!
//! [crates.io]: https://crates.io/crates/cargo-readme
//!
//! If you need a given version of `mdbook`, you may force it's
//! installation the following call:
//!
//! ```rust
//! console $ cargo install mdbook --vers 0.4.40 mdbook-linkchecker mdbook-mermaid
//! ```
//!
//! #### Multilingual version of mdBook
//!
//! The `Element-Call` book aims to make translations as flawless as
//! possible. With [`mdbook-i18n-helpers`][mdbook_i18n_helpers] you gain
//! `Gettext Translation Support` with three extensions.
//!
//! ```console
//! $ cargo install mdbook-i18n-helpers
//! ```
//!
//! It will install three binaries:
//!
//! * mdbook-xgettext: This program extracts the source text. It is an mdbook renderer.
//! * mdbook-gettext: This program translates the book into a target language.
//!   It is an mdbook preprocessor.
//! * mdbook-i18n-normalize: This program normalizs a PO file. Use it after breaking changes.
//!
//! Please have a look to the online documentation on howto actually use the Gettext subsystem.
//!
//! [mdbook_i18n_helpers]: https://github.com/google/mdbook-i18n-helpers?tab=readme-ov-file
//! [mdbook_i18n_helpers_usage]: https://github.com/google/mdbook-i18n-helpers/blob/main/i18n-helpers/USAGE.md
//!
//! #### Cargo handled README
//!
//! We do make uses of the crate [cargo-readme]. It resolves rust `doc
//! comments` to generate the README.md file you are reading now. Install the create
//! with the following command if you want to update or regenerate this README yourself.
//!
//! [cargo-readme]: https://github.com/livioribeiro/cargo-readme
//!
//! ```console
//! $ cargo install cargo-readme
//! ```
//!
//! Once the cargo-readme binary is available, you can render the
//! README.md. Change into the document-root and type:
//!
//! ```console
//! $ cargo readme > README.md
//! ```
//!
//! [mdBook]: https://github.com/rust-lang-nursery/mdBook
//! [mdBook localization]: https://github.com/Nutomic/mdBook/tree/localization
//! [rust-mdbook]: https://github.com/rust-lang/rust/blob/master/src/tools/rustbook/Cargo.toml
//!
//! ### Building
//!
//! #### Building the book
//!
//! To build the book with the default language (here: 'en'), change
//! into the root directory of the element-call submodule and type:
//!
//! ```console
//! $ mdbook build --dest-dir book_en
//! ```
//!
//! The rendered HTML output will be placed underneath the
//! `book_en` subdirectory. To check it out, open it in your web
//! browser.
//!
//! _Firefox:_
//! ```console
//! $ firefox book_en/html/index.html                       # Linux
//! $ open -a "Firefox" book_en/html/index.html             # OS X
//! $ Start-Process "firefox.exe" .\book_en\html\index.html # Windows (PowerShell)
//! $ start firefox.exe .\book_en\html\index.html           # Windows (Cmd)
//! ```
//!
//! _Chrome:_
//! ```console
//! $ google-chrome book_en/html/index.html                 # Linux
//! $ open -a "Google Chrome" book_en/html/index.html       # OS X
//! $ Start-Process "chrome.exe" .\book_en\html\index.html  # Windows (PowerShell)
//! $ start chrome.exe .\book_en\html\index.html            # Windows (Cmd)
//! ```
//!
//! Executing `mdbook serve` will have **mdbook** act has a web service
//! which can be accessed opening the following URL:  http://localhost:3000.
//!
//! To run the tests:
//!
//! ```console
//! $ mdbook test
//! ```
//!
//! <!--
//! #### Building a language variant of the book
//!
//! WIP: adapt to mdbook-i18n-helpers
//! Translated version of the book will be placed inside the code tree
//! in the subdirectory `src/<language id`.
//!
//! E.g. if you like to render the german version (language id: 'de'), change
//! into Element-Call books root directory and type:
//!
//! ```console
//! $ MDBOOK_BOOK__src=src_de mdbook build --dest-dir book_de --open
//! ```
//!
//! The rendered HTML output will be placed underneath the
//! `book_de` subdirectory. Since we appended the `--open` parameter, your default browser should be fired up and ... tada!
//! !-->
//!
//! ### 🛠️ Development
//! ==================
//!
//! We welcome contributions to the Element-Call book from the community!
//! The best place to get started is our [`guide for contributors`][contributors-guide].
//!
//! This is part of our larger [`documentation][element-documentation],
//! which includes information for Element-Call developers and
//! translaters.  We'd love your help! Please see
//! [CONTRIBUTING.md][contrib] to learn about the kinds of contributions
//! we're looking for.
//!
//! Alongside all that, join our [developercommunity][element-call-room-matrix]
//! on Matrix, featuring real humans!
//!
//! <!--
//!	WIP: once it is ready to be shipped
//! ### Code of Conduct
//!
//! We are committed to providing a friendly, safe and welcoming
//! environment. Read more about our policy in the [code-of-conduct][coc] page.
//!
//! [coc]: https://element-hq.github.io/element-call/book/policies/code-of-conduct.md
//!
//! [contrib]: https://element-hq.github.io/element-call/book/blob/main/CONTRIBUTING.md
//! [contributors-guide]: https://element-hq.github.io/element-call/book/latest/development/contributing_guide.html
//! [element-documentation]: https://element-hq.github.io/element-call/book/latest>
//! [element-call-room-matrix]: https://matrix.to/#/#element-call-dev:matrix.org>`_`
//! -->
//!
//! #### Translations
//!
//! We'd love help to translate the book! See the [Translations] label
//! to join in efforts that are currently in progress. Open a new
//! issue to start working on a new language! We're waiting on [mdbook
//! support] for multiple languages to be finalized, but feel free to
//! start! A [pull request] looks promising. The mainline version (we
//! do depend on v0.4.12) is capable to render the existing versions
//! where sources are installed in the intended final structure.
//!
//! [Translations]: https://gitea.networkx.de/rzerres/element-call/book/issues?q=is%3Aopen+is%3Aissue+label%3ATranslations
//! [mdbook support]: https://github.com/rust-lang-nursery/mdBook/issues/5
//! [pull request]: https://github.com/rust-lang/mdBook/pull/1306
//!
//! ### Spellchecking
//!
//! To scan source files for spelling errors, you can use the `spellcheck.sh`
//! script. It needs a dictionary of valid words, which is provided in
//! `dictionary.txt`. If the script produces a false positive (say, you used word
//! `BTreeMap` which the script considers invalid), you need to add this word to
//! `dictionary.txt` (keep the sorted order for consistency).
//!
//! ### License
//!
//! <!-- License source -->
//! [Logo-CC_BY]: https://i.creativecommons.org/l/by/4.0/88x31.png "Creative Common Logo"
//! [License-CC_BY]: https://creativecommons.org/licenses/by/4.0/legalcode "Creative Common License"
//!
//! This work is licensed under a [Creative Common License 4.0][License-CC_BY]
//!
//! ![Creative Common Logo][Logo-CC_BY]
//!
//! © 2024 Ralf Zerres