format_messages (local_gguf/chat_templates.rs)

Formats chat messages into model‑specific prompt templates for LLMs.

// Source: https://github.com/moltis-org/moltis | License: MIT | Copyright 2025 Fabien Penso
// Provided via justclaw.it.com; keep this notice with the code.
//! Chat template formatting for various model families.
//!
//! Different LLM families use different prompt formats. This module provides
//! template formatting for Llama3, ChatML (Qwen/Kimi), Mistral, and DeepSeek.

use moltis_agents::model::{ChatMessage, UserContent};

/// Hint for which chat template to use.
#[derive(Debug, Clone, Copy, PartialEq, Eq, Default)]
pub enum ChatTemplateHint {
    /// Try to use the model's embedded template, fall back to ChatML.
    #[default]
    Auto,
    /// Llama 3 format: `<|begin_of_text|><|start_header_id|>system<|end_header_id|>...`
    Llama3,
    /// ChatML format: `<|im_start|>system\n...<

... (truncated -- full source via MCP)