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authorLibravatar Dirkjan Ochtman <dirkjan@ochtman.nl>2017-03-05 19:48:46 +0100
committerLibravatar Dirkjan Ochtman <dirkjan@ochtman.nl>2017-03-05 19:51:21 +0100
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-Askama
-======
-
-.. image:: https://img.shields.io/crates/v/askama.svg
- :target: https://crates.io/crates/askama
-.. image:: https://travis-ci.org/djc/askama.svg?branch=master
- :target: https://travis-ci.org/djc/askama
-.. image:: https://codecov.io/gh/djc/askama/branch/master/graph/badge.svg
- :target: https://codecov.io/gh/djc/askama
-
-Askama implements a template rendering engine based on Jinja.
-It generates Rust code from your templates at compile time
-based on a user-defined ``struct`` to hold the template's context.
-See below for an example, or read `the documentation`_.
-
-**"Pretty exciting. I would love to use this already."** -- `Armin Ronacher`_,
-creator of Jinja
-
-Currently implemented features:
-
-* Generates fully type-safe Rust code from your templates
-* Template inheritance
-* Basic loops and if/else if/else statements
-* Whitespace suppressing with '-' markers
-* Some built-in filters
-* Works on stable Rust
-
-Askama is in heavy development, so it currently has some limitations:
-
-* Only a small number of built-in template filters have been implemented
-* User-defined template filters are not supported yet
-* Not a lot of documentation has been written
-* Debugging template problems is not always straightforward
-
-All feedback welcome. Feel free to file bugs, requests for documentation and
-any other feedback to the `issue tracker`_ or `tweet me`_.
-
-.. _the documentation: https://docs.rs/askama
-.. _Armin Ronacher: http://lucumr.pocoo.org/
-.. _issue tracker: https://github.com/djc/askama/issues
-.. _tweet me: https://twitter.com/djco/
-
-
-How to get started
-------------------
-
-First, add the following to your crate's ``Cargo.toml``:
-
-.. code-block:: toml
-
- # in section [package]
- build = "build.rs"
-
- # in section [dependencies]
- askama = "0.1"
- askama_derive = "0.1"
-
- # in section [build-dependencies]
- askama = "0.1"
-
-Custom derive macros can not be exported together with other items,
-so you have to depend on a separate crate for it.
-Because Askama will generate Rust code from your template files,
-the crate will need to be recompiled when your templates change.
-This is supported with a build script, ``build.rs``,
-which needs askama as a build dependency:
-
-.. code-block:: rust
-
- extern crate askama;
-
- fn main() {
- askama::rerun_if_templates_changed();
- }
-
-Now create a directory called ``templates`` in your crate root.
-In it, create a file called ``hello.html``, containing the following:
-
-.. code-block:: jinja
-
- Hello, {{ name }}!
-
-In any Rust file inside your crate, add the following:
-
-.. code-block:: rust
-
- #[macro_use]
- extern crate askama_derive; // for the custom derive implementation
- extern crate askama; // for the Template trait
-
- use askama::Template; // bring trait in scope
-
- #[derive(Template)] // this will generate the code...
- #[template(path = "hello.html")] // using the template in this path, relative
- // to the templates dir in the crate root
- struct HelloTemplate<'a> { // the name of the struct can be anything
- name: &'a str, // the field name should match the variable name
- // in your template
- }
-
- fn main() {
- let hello = HelloTemplate { name: "world" }; // instantiate your struct
- println!("{}", hello.render()); // then render it.
- }
-
-You should now be able to compile and run this code.
-
-Review the `test cases`_ for more examples.
-
-.. _test cases: https://github.com/djc/askama/tree/master/testing
-
-
-Debugging and troubleshooting
------------------------------
-
-You can view the parse tree for a template as well as the generated code by
-changing the ``template`` attribute item list for the template struct:
-
-.. code-block:: rust
-
- #[derive(Template)]
- #[template(path = "hello.html", print = "all")]
- struct HelloTemplate<'a> { ... }
-
-The ``print`` key can take one of four values:
-
-* ``none`` (the default value)
-* ``ast`` (print the parse tree)
-* ``code`` (print the generated code)
-* ``all`` (print both parse tree and code)
-
-The parse tree looks like this for the example template:
-
-.. code-block::
-
- [Lit("", "Hello,", " "), Expr(WS(false, false), Var("name")),
- Lit("", "!", "\n")]
-
-The generated code looks like this:
-
-.. code-block:: rust
-
- #[allow(dead_code, non_camel_case_types)]
- type TemplateFromhello2ehtml<'a> = HelloTemplate<'a>;
- impl<'a> askama::Template for HelloTemplate<'a> {
- fn render_to(&self, writer: &mut std::fmt::Write) {
- writer.write_str("Hello,").unwrap();
- writer.write_str(" ").unwrap();
- writer.write_fmt(format_args!("{}", self.name)).unwrap();
- writer.write_str("!").unwrap();
- writer.write_str("\n").unwrap();
- }
- }