feat: support Perplexity chat completion

Cargo.toml

@@ -1,5 +1,5 @@
 [workspace]
-members = ["anthropic", "mesh", "openai", "replicate", "examples/*"]
+members = ["anthropic", "mesh", "openai", "perplexity", "replicate", "examples/*"]
 resolver = "2"
 
 [workspace.package]

examples/perplexity-chat-completion/Cargo.toml

@@ -0,0 +1,11 @@
+[package]
+name = "perplexity-chat-completion"
+version = "0.1.0"
+edition = "2021"
+publish = false
+
+[dependencies]
+perplexity = { path = "../../perplexity" }
+futures-util = "0.3.30"
+tokio = { version = "1.39.2", features = ["full"] }
+serde_json = "1.0.128"

examples/perplexity-chat-completion/README.md

@@ -0,0 +1 @@
+# Perplexity chat completion Example

examples/perplexity-chat-completion/src/main.rs

@@ -0,0 +1,17 @@
+use perplexity::{
+    client::{Client, CreateChatCompletion, Model},
+    config::Config,
+};
+
+#[tokio::main]
+async fn main() {
+    let api_key = std::env::var("PERPLEXITY_API_KEY")
+        .expect("environment variable PERPLEXITY_API_KEY should be defined");
+
+    let config = Config::new(api_key);
+    let client = Client::new(config).unwrap();
+
+    let message = CreateChatCompletion::new(Model::Llama31SonarLargeOnline);
+    let result = client.create_completion(message).await.unwrap();
+    println!("{:?}", result);
+}

perplexity/Cargo.toml

@@ -0,0 +1,23 @@
+[package]
+name = "perplexity"
+version = "0.1.0"
+edition.workspace = true
+authors.workspace = true
+description = "Perplexity Rust SDK"
+homepage.workspace = true
+documentation.workspace = true
+repository = "https://github.com/roushou/mesh"
+readme = "README.md"
+license.workspace = true
+keywords = ["ai", "chat", "perplexity"]
+
+[dependencies]
+futures-util = "0.3.30"
+reqwest = { version = "0.12.5", features = ["json", "stream"] }
+serde = { version = "1.0.206", features = ["derive"] }
+serde_json = "1.0.124"
+thiserror = "1.0.63"
+tokio = { version = "1.39.2", features = ["full"] }
+
+[dev-dependencies]
+pretty_assertions = "1.4.0"

perplexity/README.md

@@ -0,0 +1,55 @@
+# Perplexity Rust SDK
+
+[![Crates.io][crates-badge]][crates-url]
+[![MIT licensed][mit-badge]][mit-url]
+[![APACHE-2.0 licensed][apache-badge]][apache-url]
+[![Build Status][actions-badge]][actions-url]
+
+[crates-badge]: https://img.shields.io/crates/v/perplexity.svg
+[crates-url]: https://crates.io/crates/perplexity
+[mit-badge]: https://img.shields.io/badge/license-MIT-blue.svg
+[mit-url]: https://github.com/roushou/mesh/blob/master/LICENSE-MIT
+[apache-badge]: https://img.shields.io/badge/license-apache-blue.svg
+[apache-url]: https://github.com/roushou/mesh/blob/master/LICENSE-APACHE
+[actions-badge]: https://github.com/roushou/mesh/workflows/CI/badge.svg
+[actions-url]: https://github.com/roushou/mesh/actions?query=workflow%3ACI+branch%3Amaster
+
+This is an unofficial Rust SDK for the Perplexity API.
+
+More information about this crate can be found in the [crate documentation](https://crates.io/crates/perplexity).
+
+## Installation
+
+Add `perplexity` as a dependency to your `Cargo.toml`
+
+```sh
+$ cargo add perplexity
+```
+
+## Usage
+
+An example to create a completion.
+
+```rust,ignore
+use perplexity::{
+    client::{Client, CreateChatCompletion, Model},
+    config::Config,
+};
+
+#[tokio::main]
+async fn main() {
+    let api_key = std::env::var("PERPLEXITY_API_KEY")
+        .expect("environment variable PERPLEXITY_API_KEY should be defined");
+
+    let config = Config::new(api_key);
+    let client = Client::new(config).unwrap();
+
+    let message = CreateChatCompletion::new(Model::Llama31SonarLargeOnline);
+    let result = client.create_completion(message.clone()).await.unwrap();
+    println!("{:?}", result);
+}
+```
+
+## License
+
+This project is licensed under the [MIT license](../LICENSE-MIT) and [Apache-2.0](../LICENSE-APACHE) license.