turbocommit 1.6.0

A CLI tool to create commit messages with OpenAI GPT models
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use serde::{Deserialize, Serialize};
use std::str::FromStr;

#[derive(Debug, Clone, Default, PartialEq)]
pub struct Model(pub String);

impl FromStr for Model {
    type Err = String;

    fn from_str(s: &str) -> Result<Self, Self::Err> {
        Ok(Self(s.to_string()))
    }
}

impl ToString for Model {
    fn to_string(&self) -> String {
        self.0.clone()
    }
}

impl Serialize for Model {
    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
    where
        S: serde::Serializer,
    {
        serializer.serialize_str(&self.0)
    }
}

impl<'de> Deserialize<'de> for Model {
    fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
    where
        D: serde::Deserializer<'de>,
    {
        let s = String::deserialize(deserializer)?;
        Ok(Self(s))
    }
}

impl Model {
    pub fn context_size(&self) -> usize {
        match self.0.as_str() {
            "gpt-4" => 8192,
            "gpt-4-turbo" => 128000,
            "gpt-4o" => 128000,
            "gpt-4o-mini" => 128000,
            "o1" => 200000,
            "o1-mini" => 128000,
            "o1-preview" => 128000,
            "o3-mini" => 200000,
            "gpt-5-nano" => 128000,
            "gpt-5-mini" => 128000,
            "gpt-5" => 200000,
            "gpt-5-codex" => 128000,
            _ => usize::MAX,
        }
    }
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn test_gpt5_models_context_sizes() {
        assert_eq!(Model("gpt-5-nano".to_string()).context_size(), 128000);
        assert_eq!(Model("gpt-5-mini".to_string()).context_size(), 128000);
        assert_eq!(Model("gpt-5".to_string()).context_size(), 200000);
        assert_eq!(Model("gpt-5-codex".to_string()).context_size(), 128000);
    }

    #[test]
    fn test_existing_models_context_sizes() {
        assert_eq!(Model("gpt-4".to_string()).context_size(), 8192);
        assert_eq!(Model("gpt-4-turbo".to_string()).context_size(), 128000);
        assert_eq!(Model("gpt-4o".to_string()).context_size(), 128000);
        assert_eq!(Model("o1".to_string()).context_size(), 200000);
        assert_eq!(Model("o3-mini".to_string()).context_size(), 200000);
    }

    #[test]
    fn test_unknown_model_returns_max() {
        assert_eq!(Model("unknown-model".to_string()).context_size(), usize::MAX);
    }
}