prai 0.3.1

A command-line tool that generates concise pull request descriptions from git diffs using configurable AI providers.
Documentation 
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use log::debug;
use secrecy::ExposeSecret;
use serde::{Deserialize, Serialize};

use crate::{providers::Provider, settings::AnthropicSettings};

pub struct AnthropicProvider {
    config: AnthropicSettings,
}

impl Provider for AnthropicProvider {
    type Config = AnthropicSettings;

    fn from_config(config: Self::Config) -> Self {
        debug!("Create Anthropic provider from {config:?}");
        Self { config }
    }

    fn build_url(&self) -> String {
        "https://api.anthropic.com/v1/messages".to_string()
    }

    fn build_request_body(&self, prompt: &str) -> anyhow::Result<serde_json::Value> {
        Ok(serde_json::to_value(Payload::from_settings_and_prompt(
            prompt.to_string(),
            self.config.clone(),
        ))?)
    }

    fn parse_response(&self, response: serde_json::Value) -> anyhow::Result<String> {
        let generated_text = response
            .get("content")
            .and_then(|content| content.as_array())
            .and_then(|content_array| content_array.first())
            .and_then(|first_content| first_content.get("text"))
            .and_then(|text| text.as_str())
            .unwrap_or("")
            .to_string();

        Ok(generated_text)
    }

    fn get_client(&self) -> reqwest::blocking::Client {
        let mut headers = reqwest::header::HeaderMap::new();

        if let Ok(api_key_header) =
            reqwest::header::HeaderValue::from_str(self.config.api_key.expose_secret())
        {
            headers.insert("x-api-key", api_key_header);
        }

        if let Ok(version_header) = reqwest::header::HeaderValue::from_str(&self.config.version) {
            headers.insert("anthropic-version", version_header);
        }

        headers.insert(
            reqwest::header::CONTENT_TYPE,
            reqwest::header::HeaderValue::from_static("application/json"),
        );

        reqwest::blocking::Client::builder()
            .default_headers(headers)
            .build()
            .unwrap_or_else(|_| reqwest::blocking::Client::new())
    }
}

#[derive(Debug, Deserialize, Serialize)]
pub struct Payload {
    pub model: String,
    pub max_tokens: u32,
    #[serde(default, skip_serializing_if = "Option::is_none")]
    pub temperature: Option<f32>,
    #[serde(default, skip_serializing_if = "Option::is_none")]
    pub top_p: Option<f32>,
    pub messages: Vec<Message>,
}

impl Payload {
    pub fn from_settings_and_prompt(prompt: String, settings: AnthropicSettings) -> Self {
        Self {
            model: settings.model,
            max_tokens: settings.max_tokens,
            temperature: settings.temperature,
            top_p: settings.top_p,
            messages: vec![Message {
                role: Role::User,
                content: prompt,
            }],
        }
    }
}

#[derive(Debug, Deserialize, Serialize)]
pub struct Message {
    pub role: Role,
    pub content: String,
}

#[derive(Debug, Deserialize, Serialize)]
#[serde(rename_all = "lowercase")]
pub enum Role {
    User,
}