chat-prompts 0.4.1

Chat prompt template
Documentation 
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use super::BuildChatPrompt;
use crate::error::Result;
use endpoints::chat::{ChatCompletionRequestMessage, ChatCompletionRole};

/// Generate prompts for the `wizard-vicuna` model.
#[derive(Debug, Default, Clone)]
pub struct NeuralChatPrompt;
impl NeuralChatPrompt {
    /// Create a system prompt from a chat completion request message.
    fn create_system_prompt(&self, system_message: &ChatCompletionRequestMessage) -> String {
        let content = system_message.content.as_str();
        match content.is_empty() {
            true => String::from("### System:\nYou are a chatbot developed by Intel. Please answer all questions to the best of your ability."),
            false => format!("### System:\n{content}"),
        }
    }

    /// Create a user prompt from a chat completion request message.
    fn append_user_message(
        &self,
        chat_history: impl AsRef<str>,
        system_prompt: impl AsRef<str>,
        content: impl AsRef<str>,
    ) -> String {
        match chat_history.as_ref().is_empty() {
            true => format!(
                "{system_prompt}\n### User:\n{user_message}",
                system_prompt = system_prompt.as_ref().trim(),
                user_message = content.as_ref().trim(),
            ),
            false => format!(
                "{chat_history}\n### User:\n{user_message}",
                chat_history = chat_history.as_ref().trim(),
                user_message = content.as_ref().trim(),
            ),
        }
    }

    /// create an assistant prompt from a chat completion request message.
    fn append_assistant_message(
        &self,
        chat_history: impl AsRef<str>,
        content: impl AsRef<str>,
    ) -> String {
        format!(
            "{chat_history}\n### Assistant:\n{assistant_message}",
            chat_history = chat_history.as_ref().trim(),
            assistant_message = content.as_ref().trim(),
        )
    }
}
impl BuildChatPrompt for NeuralChatPrompt {
    fn build(&self, messages: &mut Vec<ChatCompletionRequestMessage>) -> Result<String> {
        if messages.is_empty() {
            return Ok(String::new());
        }

        // systemp prompt
        let system_prompt = if messages[0].role == ChatCompletionRole::System {
            self.create_system_prompt(&messages[0])
        } else {
            String::from("### System:\nYou are a chatbot developed by Intel. Please answer all questions to the best of your ability.")
        };

        // append user/assistant messages
        if messages.is_empty() {
            return Err(crate::error::PromptError::NoMessages);
        }

        let mut prompt = String::new();
        for message in messages {
            match message.role {
                ChatCompletionRole::System => continue,
                ChatCompletionRole::User => {
                    prompt =
                        self.append_user_message(&prompt, &system_prompt, message.content.as_str());
                }
                ChatCompletionRole::Assistant => {
                    prompt = self.append_assistant_message(&prompt, message.content.as_str());
                }
                _ => {
                    return Err(crate::error::PromptError::UnknownRole(message.role));
                }
            }
        }

        prompt.push_str("\n### Assistant:");

        Ok(prompt)
    }
}