docs: written docs

LICENSE

@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2024 zaaarf
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

README.md

@@ -1,2 +1,4 @@
 # Fluent, fluently
-I found myself needing to do localisation, one time. I decided I'd want it to happen at runtime, so that any spelling fixes may be applied without needing to recompile the whole program. [Fluent](https://github.com/projectfluent/fluent-rs) provides an API, but no real way to use it. I couldn't find any existing implementation fitting my use case, so I wrote this.
+A small Rust library handling loading runtime loading of [Fluent](https://github.com/projectfluent/fluent-rs) localisation. By design, Fluent does not touch the IO part, only providing String parsing. This library takes care of that.
+
+I intentionally kept this as simple as possible to reflect my very basic use case. Check out [fluent-localization](https://github.com/AEnterprise/fluent-localization) for something with more features, namely compile-time validation and localisation struct generation for easier access.

src/error.rs

@@ -4,11 +4,14 @@ use fluent::FluentResource;
 
 pub type Result<T> = StdResult<T, Error>;
 
+/// Simple wrapper around the errors that may occur during the program's execution.
 #[derive(Debug)]
 pub enum Error {
+	GenericError(String),
 	IoError(std::io::Error),
 	LanguageIdentifierError(unic_langid::LanguageIdentifierError),
-	FluentError(Vec<fluent::FluentError>)
+	FluentError(Vec<fluent::FluentError>),
+	MissingMessageError(String)
 }
 
 impl From<std::io::Error> for Error {

src/lib.rs

@@ -1,18 +1,29 @@
 use std::{collections::HashMap, sync::Arc};
-use fluent::{bundle::FluentBundle, FluentResource};
+use fluent::{bundle::FluentBundle, FluentResource, FluentMessage};
 use intl_memoizer::concurrent::IntlLangMemoizer;
 use unic_langid::LanguageIdentifier;
 use crate::error::Result;
 
 pub mod error;
 
+/// Shorthand type handling the [FluentBundle]'s generic types.
 type TypedFluentBundle = FluentBundle<Arc<FluentResource>, IntlLangMemoizer>;
+
+/// The main struct of the program.
+/// You can obtain a new instance by calling [Self::try_load()].
 pub struct Localiser {
 	pub bundles: HashMap<LanguageIdentifier, TypedFluentBundle>,
 	pub default_language: LanguageIdentifier
 }
 
 impl Localiser {
+	/// Tries to create a new [Localiser] instance given a path and the name of the default language.
+	/// The path's direct children will only be considered if their names are valid language codes as
+	/// defined by [LanguageIdentifier], and if they are either files with the `.ftl` extension or
+	/// directories. In the first case they will be read directly and converted in [FluentResource]s,
+	/// in the second case the same will be done to their chilren instead.
+	/// [FluentResource]s within a same folder will be considered part of a same [FluentBundle],
+	/// forming a single localisation for all intents and purposes.
 	pub fn try_load(path: String, default_language: String) -> Result<Self> {
 		let mut bundles = HashMap::new();
 		let paths = std::fs::read_dir(path)?
@@ -26,7 +37,6 @@ impl Localiser {
 				}
 			}).collect::<Vec<_>>();
 
-		//TODO load default first and call bundle.add_resource_overriding(default_bundle) on others
 		let default_language = default_language.parse::<LanguageIdentifier>()?;
 
 		for path in paths {
@@ -63,17 +73,44 @@ impl Localiser {
 		})
 	}
 
+	/// Reads all files in a certain folder and all of its subfolders that have the `.ftl`
+	/// extension, parses them into [FluentResource]s and returns them in a [Vec]. 
 	fn path_to_resources(path: &std::path::PathBuf) -> Result<Vec<Arc<FluentResource>>> {
 		let mut res = Vec::new();
 		for entry in walkdir::WalkDir::new(path).follow_links(true).into_iter().filter_map(|e| e.ok()) {
 			let entry_path = entry.path().to_path_buf();
+			let entry_extension = entry_path.extension();
+			if entry_extension.is_none() || entry_extension.unwrap() != "ftl" {
+				continue;
+			}
+
 			res.push(Self::file_to_resource(&entry_path)?);
 		}
 		Ok(res)
 	}
 
+	/// Reads the file at the given path, and tries to parse it into a [FluentResource].
 	fn file_to_resource(path: &std::path::PathBuf) -> Result<Arc<FluentResource>> {
-		let content = std::fs::read_to_string(path)?;
-		Ok(Arc::new(FluentResource::try_new(content)?))
+		Ok(Arc::new(FluentResource::try_new(std::fs::read_to_string(path)?)?))
+	}
+
+	/// Extracts a message from the requested bundle, or from the default one if absent. 
+	pub fn get_message(&self, key: String, language: LanguageIdentifier) -> Result<FluentMessage> {
+		let bundle = self.bundles.get(&language)
+			.or_else(|| self.bundles.get(&self.default_language))
+			.ok_or(error::Error::GenericError("Failed to get default bundle! This is not supposed to happen!".to_string()))?;
+
+		bundle.get_message(&key)
+			.ok_or(error::Error::MissingMessageError(format!("No such message {} for language {}!", key, language)))
+	}
+
+	/// Returns a [HashMap] tying each [LanguageIdentifier] to its [String] equivalent, to simplify retrieval.
+	/// Call this as little as possible, as it's rather unoptimised and may scale poorly.
+	pub fn available_languages(&self) -> HashMap<String, LanguageIdentifier> {
+		let mut res = HashMap::new();
+		for lang in self.bundles.keys() {
+			res.insert(lang.to_string(), lang.clone());
+		}
+		res
 	}
 }