Crate askama

Expand description

Askama implements a type-safe compiler for Jinja-like templates. It lets you write templates in a Jinja-like syntax, which are linked to a struct defining the template context. This is done using a custom derive implementation (implemented in askama_derive).

For feature highlights and a quick start, please review the README.

The primary documentation for this crate now lives in the book.

Creating Askama templates

An Askama template is a struct definition which provides the template context combined with a UTF-8 encoded text file (or inline source, see below). Askama can be used to generate any kind of text-based format. The template file’s extension may be used to provide content type hints.

A template consists of text contents, which are passed through as-is, expressions, which get replaced with content while being rendered, and tags, which control the template’s logic. The template syntax is very similar to Jinja, as well as Jinja-derivatives like Twig or Tera.

The `template()` attribute

Askama works by generating one or more trait implementations for any struct type decorated with the #[derive(Template)] attribute. The code generation process takes some options that can be specified through the template() attribute. The following sub-attributes are currently recognized:

path (as path = "foo.html"): sets the path to the template file. The path is interpreted as relative to the configured template directories (by default, this is a templates directory next to your Cargo.toml). The file name extension is used to infer an escape mode (see below). In web framework integrations, the path’s extension may also be used to infer the content type of the resulting response. Cannot be used together with source.
source (as source = "{{ foo }}"): directly sets the template source. This can be useful for test cases or short templates. The generated path is undefined, which generally makes it impossible to refer to this template from other templates. If source is specified, ext must also be specified (see below). Cannot be used together with path.
ext (as ext = "txt"): lets you specify the content type as a file extension. This is used to infer an escape mode (see below), and some web framework integrations use it to determine the content type. Cannot be used together with path.
print (as print = "code"): enable debugging by printing nothing (none), the parsed syntax tree (ast), the generated code (code) or all for both. The requested data will be printed to stdout at compile time.
escape (as escape = "none"): override the template’s extension used for the purpose of determining the escaper for this template. See the section on configuring custom escapers for more information.
syntax (as syntax = "foo"): set the syntax name for a parser defined in the configuration file. The default syntax , “default”, is the one provided by Askama.