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-rw-r--r--dhall/src/lib.rs106
1 files changed, 106 insertions, 0 deletions
diff --git a/dhall/src/lib.rs b/dhall/src/lib.rs
index 2d44115..ababc5d 100644
--- a/dhall/src/lib.rs
+++ b/dhall/src/lib.rs
@@ -9,6 +9,112 @@
clippy::many_single_char_names
)]
+//! [Dhall][dhall] is a programmable configuration language that provides a non-repetitive
+//! alternative to JSON and YAML.
+//!
+//! You can think of Dhall as: JSON/YAML + types + imports + functions
+//!
+//! For a description of the dhall language, examples, tutorials, and more, see the [language
+//! website][dhall].
+//!
+//! This crate provides support for consuming dhall files the same way you would consume JSON or
+//! YAML. It uses the [Serde][serde] serialization library to provide drop-in support for dhall
+//! for any datatype that supports serde (and that's a lot of them !).
+//!
+//! This library is limited to deserializing (reading) dhall values; serializing (writing)
+//! values to dhall is not supported for now.
+//!
+//! # Examples
+//!
+//! ### Custom datatype
+//!
+//! If you have a custom datatype for which you derived [serde::Deserialize], chances are
+//! you will be able to derive [SimpleStaticType] for it as well. This gives you access to
+//! a dhall representation of your datatype that can be outputted to users, and
+//! allows easy type-safe deserializing.
+//!
+//! ```edition2018
+//! use serde::Deserialize;
+//! use dhall::SimpleStaticType;
+//!
+//! #[derive(Debug, Deserialize, SimpleStaticType)]
+//! struct Point {
+//! x: usize,
+//! y: usize,
+//! }
+//!
+//! fn main() {
+//! // Some dhall data
+//! // ./Point can be populated using Point::get_type().to_string()
+//! let data = "{ x = 1, y = 1 + 1 } : ./Point";
+//!
+//! // Convert the dhall string to a Point.
+//! let point: Point =
+//! dhall::from_str_auto_type(&data)
+//! .expect("An error ocurred !");
+//!
+//! // Prints "point = Point { x: 1, y: 2 }"
+//! println!("point = {:?}", point);
+//! }
+//! ```
+//!
+//! ### Loosely typed
+//!
+//! If you used to consume JSON or YAML in a loosely typed way, you can continue to do so
+//! with dhall. You only need to replace [serde_json::from_str] or [serde_yaml::from_str]
+//! with [dhall::from_str][from_str].
+//! More generally, if the [SimpleStaticType] derive doesn't suit your needs, you can still
+//! deserialize any valid dhall file that serde can handle.
+//!
+//! [serde_json::from_str]: https://docs.serde.rs/serde_json/de/fn.from_str.html
+//! [serde_yaml::from_str]: https://docs.serde.rs/serde_yaml/fn.from_str.html
+//!
+//! ```edition2018
+//! use std::collections::BTreeMap;
+//!
+//! let mut map = BTreeMap::new();
+//! map.insert("x".to_string(), 1);
+//! map.insert("y".to_string(), 2);
+//!
+//! // Some dhall data
+//! let data = "{ x = 1, y = 1 + 1 } : { x: Natural, y: Natural }";
+//!
+//! // Deserialize it to a Rust type.
+//! let deserialized_map: BTreeMap<String, usize> =
+//! dhall::from_str(&data, None)
+//! .expect("Failed reading the data !");
+//! assert_eq!(map, deserialized_map);
+//! ```
+//!
+//! You can of course specify a dhall type that the input should match.
+//!
+//! ```edition2018
+//! use std::collections::BTreeMap;
+//!
+//! let mut map = BTreeMap::new();
+//! map.insert("x".to_string(), 1);
+//! map.insert("y".to_string(), 2);
+//!
+//! // Some dhall data
+//! let point_data = "{ x = 1, y = 1 + 1 }";
+//! let point_type_data = "{ x: Natural, y: Natural }";
+//!
+//! // Construct a type
+//! let point_type =
+//! dhall::from_str(point_type_data, None)
+//! .expect("Could not parse the Point type");
+//!
+//! // Deserialize it to a Rust type.
+//! let deserialized_map: BTreeMap<String, usize> =
+//! dhall::from_str(&point_data, Some(&point_type))
+//! .expect("Failed reading the data !");
+//! assert_eq!(map, deserialized_map);
+//! ```
+//!
+//! [dhall]: https://dhall-lang.org/
+//! [serde]: https://docs.serde.rs/serde/
+//! [serde::Deserialize]: https://docs.serde.rs/serde/trait.Deserialize.html
+
#[cfg(test)]
#[macro_use]
mod tests;