sofos 0.2.11

An interactive AI coding agent for your terminal
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//! `index.json` shape and the read-modify-write paths that maintain it.
//! The save-lock acquired by [`HistoryManager::save_session`] serialises
//! the read-modify-write against concurrent sofos processes in the same
//! workspace — see the comment on `SAVE_LOCK_FILE`.

use crate::error::Result;
use crate::session::history::HistoryManager;
use crate::session::history::atomic_write;
use crate::session::history::model::{Session, SessionMetadata};
use serde::{Deserialize, Serialize};
use std::fs;

pub(super) const INDEX_FILE: &str = "index.json";

#[derive(Debug, Serialize, Deserialize)]
pub(super) struct SessionIndex {
    pub(super) sessions: Vec<SessionMetadata>,
}

impl HistoryManager {
    pub(super) fn update_index(&self, session: &Session) -> Result<()> {
        let index_path = self.index_path();
        let mut index: SessionIndex = if index_path.exists() {
            serde_json::from_str(&fs::read_to_string(&index_path)?)?
        } else {
            SessionIndex {
                sessions: Vec::new(),
            }
        };

        let preview = Self::extract_preview(&session.api_messages);
        let metadata = SessionMetadata {
            id: session.id.clone(),
            preview,
            created_at: session.created_at,
            updated_at: session.updated_at,
            message_count: session.api_messages.len(),
        };

        if let Some(pos) = index.sessions.iter().position(|s| s.id == session.id) {
            index.sessions[pos] = metadata;
        } else {
            index.sessions.push(metadata);
        }

        index
            .sessions
            .sort_by(|a, b| b.updated_at.cmp(&a.updated_at));

        let content = serde_json::to_string_pretty(&index)?;
        atomic_write(&index_path, &content)?;

        Ok(())
    }

    pub fn list_sessions(&self) -> Result<Vec<SessionMetadata>> {
        let index_path = self.index_path();

        if !index_path.exists() {
            return Ok(Vec::new());
        }

        let content = fs::read_to_string(index_path)?;
        let index: SessionIndex = serde_json::from_str(&content)?;

        Ok(index.sessions)
    }
}