refactor: message record format (#12)

```
i am excited

--------
😃💥🎉
--------
```

6 files changed, 33 insertions, 4 deletions

diff --git a/Cargo.lock b/Cargo.lock
index 549539e..59b257f 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -23,6 +23,7 @@ version = "0.2.0"
 dependencies = [
  "anyhow",
  "bytes",
+ "chrono",
  "clap",
  "copypasta",
  "crossbeam",
diff --git a/Cargo.toml b/Cargo.toml
index 92c63eb..d70b5ea 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -32,6 +32,7 @@ pulldown-cmark = { version = "0.9.2", default-features = false, features = ['sim
 crossbeam = "0.8.2"
 crossterm = "0.26.1"
 copypasta = "0.8.2"
+chrono = "0.4.23"
 
 [dependencies.syntect]
 version = "5.0.0"
diff --git a/src/config.rs b/src/config.rs
index b5220dd..3a85066 100644
--- a/src/config.rs
+++ b/src/config.rs
@@ -10,6 +10,8 @@ use anyhow::{anyhow, Result};
 use inquire::{Confirm, Text};
 use serde::Deserialize;
 
+use crate::utils::now;
+
 const CONFIG_FILE_NAME: &str = "config.yaml";
 const ROLES_FILE_NAME: &str = "roles.yaml";
 const HISTORY_FILE_NAME: &str = "history.txt";
@@ -97,11 +99,21 @@ impl Config {
         Ok(file)
     }
 
-    pub fn save_message(file: Option<&mut File>, input: &str, output: &str) {
+    pub fn save_message(
+        file: Option<&mut File>,
+        input: &str,
+        output: &str,
+        role_name: &Option<String>,
+    ) {
+        let role_name = match role_name {
+            Some(v) => format!("({v})"),
+            None => String::new(),
+        };
+        let timestamp = format!("[{}]", now());
         if let (false, Some(file)) = (output.is_empty(), file) {
             let _ = file.write_all(
                 format!(
-                    "AICHAT: {}\n\n--------\n{}\n--------\n\n",
+                    "# CHAT:{timestamp} {role_name}\n{}\n\n--------\n{}\n--------\n\n",
                     input.trim(),
                     output.trim(),
                 )
diff --git a/src/main.rs b/src/main.rs
index 9cb360d..55c09a6 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -56,7 +56,9 @@ fn start_directive(
     input: &str,
 ) -> Result<()> {
     let mut file = config.open_message_file()?;
-    let output = client.acquire(input, role.map(|v| v.prompt))?;
+    let prompt = role.as_ref().map(|v| v.prompt.to_string());
+    let role_name = role.as_ref().map(|v| v.name.to_string());
+    let output = client.acquire(input, prompt)?;
     let output = output.trim();
     if !config.no_highlight && stdout().is_terminal() {
         let markdown_render = MarkdownRender::init()?;
@@ -65,7 +67,7 @@ fn start_directive(
         println!("{output}");
     }
 
-    Config::save_message(file.as_mut(), input, output);
+    Config::save_message(file.as_mut(), input, output, &role_name);
     Ok(())
 }
 
diff --git a/src/repl.rs b/src/repl.rs
index 2a3a48f..164d746 100644
--- a/src/repl.rs
+++ b/src/repl.rs
@@ -278,10 +278,17 @@ impl ReplCmdHandler {
                 };
                 self.client
                     .acquire_stream(&input, prompt, &mut receiver, self.ctrlc.clone())?;
+                let role = self
+                    .state
+                    .borrow_mut()
+                    .role
+                    .as_ref()
+                    .map(|v| v.name.to_string());
                 Config::save_message(
                     self.state.borrow_mut().save_file.as_mut(),
                     &input,
                     &receiver.output,
+                    &role,
                 );
                 wg.wait();
                 self.state.borrow_mut().reply = receiver.output;
diff --git a/src/utils.rs b/src/utils.rs
index cb5d1f9..b248d92 100644
--- a/src/utils.rs
+++ b/src/utils.rs
@@ -1,4 +1,5 @@
 use anyhow::{anyhow, Result};
+use chrono::prelude::*;
 use copypasta::{ClipboardContext, ClipboardProvider};
 use std::io::{stdout, Write};
 
@@ -17,3 +18,8 @@ pub fn paste() -> Result<String> {
     let mut ctx = ClipboardContext::new().map_err(|err| anyhow!("{err}"))?;
     ctx.get_contents().map_err(|err| anyhow!("{err}"))
 }
+
+pub fn now() -> String {
+    let now = Local::now();
+    now.to_rfc3339_opts(SecondsFormat::Secs, false)
+}