oxi-ai 0.4.0

Unified LLM API — multi-provider streaming interface for AI coding assistants
Documentation 
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//! Conversation context management

use super::{Message, Tool};
use serde::{Deserialize, Serialize};

/// Conversation context for LLM interactions
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct Context {
    /// System prompt sent with each request
    #[serde(skip_serializing_if = "Option::is_none")]
    pub system_prompt: Option<String>,

    /// Conversation history
    pub messages: Vec<Message>,

    /// Available tools for this context
    #[serde(default)]
    pub tools: Vec<Tool>,
}

impl Default for Context {
    fn default() -> Self {
        Self::new()
    }
}

impl Context {
    /// Create a new empty context
    pub fn new() -> Self {
        Self {
            system_prompt: None,
            messages: Vec::new(),
            tools: Vec::new(),
        }
    }

    /// Create a context with a system prompt
    pub fn with_system_prompt(mut self, prompt: impl Into<String>) -> Self {
        self.system_prompt = Some(prompt.into());
        self
    }

    /// Add a message to the context
    pub fn add_message(&mut self, message: Message) {
        self.messages.push(message);
    }

    /// Get a message by index
    pub fn message(&self, index: usize) -> Option<&Message> {
        self.messages.get(index)
    }

    /// Get the last message
    pub fn last_message(&self) -> Option<&Message> {
        self.messages.last()
    }

    /// Check if context has any messages
    pub fn is_empty(&self) -> bool {
        self.messages.is_empty()
    }

    /// Get number of messages
    pub fn len(&self) -> usize {
        self.messages.len()
    }

    /// Set the system prompt
    pub fn set_system_prompt(&mut self, prompt: impl Into<String>) {
        self.system_prompt = Some(prompt.into());
    }

    /// Clear the system prompt
    pub fn clear_system_prompt(&mut self) {
        self.system_prompt = None;
    }

    /// Set available tools
    pub fn set_tools(&mut self, tools: Vec<Tool>) {
        self.tools = tools;
    }

    /// Add a tool
    pub fn add_tool(&mut self, tool: Tool) {
        self.tools.push(tool);
    }

    /// Serialize context to JSON string
    pub fn to_json(&self) -> Result<String, serde_json::Error> {
        serde_json::to_string(self)
    }

    /// Deserialize context from JSON string
    pub fn from_json(json: &str) -> Result<Self, serde_json::Error> {
        serde_json::from_str(json)
    }

    /// Clone the context
    pub fn clone(&self) -> Self {
        Self {
            system_prompt: self.system_prompt.clone(),
            messages: self.messages.clone(),
            tools: self.tools.clone(),
        }
    }
}

impl From<Vec<Message>> for Context {
    fn from(messages: Vec<Message>) -> Self {
        Self {
            system_prompt: None,
            messages,
            tools: Vec::new(),
        }
    }
}

impl From<Message> for Context {
    fn from(message: Message) -> Self {
        Self {
            system_prompt: None,
            messages: vec![message],
            tools: Vec::new(),
        }
    }
}