implement save/restore session manager

Author: alexylon

Cargo.lock

@@ -27,6 +27,7 @@ syntect = "5.2"
 # Utilities
 futures = "0.3"
 pathdiff = "0.2"
+chrono = "0.4"
 
 # Logging (optional but helpful)
 tracing = "0.1"

Cargo.toml

@@ -9,6 +9,7 @@ A blazingly fast, interactive AI coding assistant powered by Claude, implemented
 ## Features
 
 - **Interactive REPL** - Multi-turn conversations with Claude
+- **Session History** - Automatic session saving and resume previous conversations
 - **File Operations** - Read, write, list, and create files/directories (sandboxed to current directory)
 - **Ultra-Fast Editing** - Optional Morph Apply integration (10,500+ tokens/sec, 96-98% accuracy)
 - **Code Search** - Fast regex-based code search using `ripgrep` (optional)
@@ -67,19 +68,27 @@ sofos --prompt "Create a hello world Rust program"
 - `clear` - Clear conversation history
 - `exit` or `quit` - Exit
 - `Ctrl+D` - Exit
+- `resume` - Resume previous session
 
 ### Options
 
 ```
 --api-key <KEY>         Anthropic API key (overrides ANTHROPIC_API_KEY)
 --morph-api-key <KEY>   Morph API key (overrides MORPH_API_KEY)
 -p, --prompt <TEXT>     One-shot mode
+-r, --resume            Resume a previous conversation session
 --model <MODEL>         Claude model (default: claude-sonnet-4-5)
 --morph-model <MODEL>   Morph model (default: morph-v3-fast)
 --max-tokens <N>        Max response tokens (default: 8192)
 -v, --verbose           Verbose logging
 ```
 
+## Session History
+
+All conversations are automatically saved to `.sofos/sessions/` in your project directory. 
+Resume previous sessions with `sofos --resume` or type `resume` in the REPL. 
+Sessions show a preview of the first message, last updated time, and message count.
+
 ## Available Tools
 
 Claude can automatically use these tools:

README.md

@@ -18,6 +18,10 @@ pub struct Cli {
     #[arg(short, long)]
     pub prompt: Option<String>,
 
+    /// Resume a previous conversation session
+    #[arg(short, long)]
+    pub resume: bool,
+
     #[arg(long, default_value = "claude-sonnet-4-5")]
     pub model: String,
 

src/cli.rs

@@ -1,6 +1,6 @@
 use crate::api::Message;
 
-const MAX_MESSAGES: usize = 50;
+const MAX_MESSAGES: usize = 500;
 
 /// Manages conversation history for the REPL
 pub struct ConversationHistory {
@@ -103,6 +103,10 @@ Your goal is to help users with coding tasks efficiently and accurately."#,
         self.messages.clear();
     }
 
+    pub fn restore_messages(&mut self, messages: Vec<Message>) {
+        self.messages = messages;
+    }
+
     pub fn _len(&self) -> usize {
         self.messages.len()
     }