feat: add .compress session REPL command (#907)

src/config/mod.rs

@@ -1133,11 +1133,28 @@ impl Config {
         false
     }
 
-    pub fn compress_session(&mut self, summary: &str) {
-        if let Some(session) = self.session.as_mut() {
-            let summary_prompt = self.summary_prompt.as_deref().unwrap_or(SUMMARY_PROMPT);
+    pub async fn compress_session(config: &GlobalConfig) -> Result<()> {
+        match config.read().session.as_ref() {
+            Some(session) => {
+                if !session.has_user_messages() {
+                    bail!("No need to compress since there are no messages in the session")
+                }
+            }
+            None => bail!("No session"),
+        }
+        let input = Input::from_str(config, config.read().summarize_prompt(), None);
+        let client = input.create_client()?;
+        let summary = client.chat_completions(input).await?.text;
+        let summary_prompt = config
+            .read()
+            .summary_prompt
+            .clone()
+            .unwrap_or_else(|| SUMMARY_PROMPT.into());
+        if let Some(session) = config.write().session.as_mut() {
             session.compress(format!("{}{}", summary_prompt, summary));
         }
+        config.write().last_message = None;
+        Ok(())
     }
 
     pub fn summarize_prompt(&self) -> &str {
@@ -1155,7 +1172,6 @@ impl Config {
         if let Some(session) = self.session.as_mut() {
             session.set_compressing(false);
         }
-        self.last_message = None;
     }
 
     pub async fn use_rag(

src/config/session.rs

@@ -110,6 +110,10 @@ impl Session {
         self.model().total_tokens(&self.messages)
     }
 
+    pub fn has_user_messages(&self) -> bool {
+        self.messages.iter().any(|v| v.role.is_user())
+    }
+
     pub fn user_messages_len(&self) -> usize {
         self.messages.iter().filter(|v| v.role.is_user()).count()
     }
@@ -372,12 +376,9 @@ impl Session {
                 }
             }
         } else {
-            let mut need_add_msg = true;
             if self.messages.is_empty() {
                 self.messages.extend(input.role().build_messages(input));
-                need_add_msg = false;
-            }
-            if need_add_msg {
+            } else {
                 self.messages
                     .push(Message::new(MessageRole::User, input.message_content()));
             }

src/repl/mod.rs

@@ -10,7 +10,7 @@ use crate::client::{call_chat_completions, call_chat_completions_streaming};
 use crate::config::{AssertState, Config, GlobalConfig, Input, StateFlags};
 use crate::function::need_send_tool_results;
 use crate::render::render_error;
-use crate::utils::{create_abort_signal, set_text, temp_file, AbortSignal};
+use crate::utils::{create_abort_signal, create_spinner, set_text, temp_file, AbortSignal};
 
 use anyhow::{bail, Context, Result};
 use fancy_regex::Regex;
@@ -31,7 +31,7 @@ lazy_static::lazy_static! {
 const MENU_NAME: &str = "completion_menu";
 
 lazy_static::lazy_static! {
-    static ref REPL_COMMANDS: [ReplCommand; 33] = [
+    static ref REPL_COMMANDS: [ReplCommand; 34] = [
         ReplCommand::new(".help", "Show this help message", AssertState::pass()),
         ReplCommand::new(".info", "View system info", AssertState::pass()),
         ReplCommand::new(".model", "Change the current LLM", AssertState::pass()),
@@ -75,6 +75,11 @@ lazy_static::lazy_static! {
             "Erase messages in the current session",
             AssertState::True(StateFlags::SESSION)
         ),
+        ReplCommand::new(
+            ".compress session",
+            "Compress messages in the current session",
+            AssertState::True(StateFlags::SESSION)
+        ),
         ReplCommand::new(
             ".info session",
             "View session info",
@@ -360,6 +365,23 @@ impl Repl {
                         }
                     }
                 }
+                ".compress" => {
+                    match args.map(|v| match v.split_once(' ') {
+                        Some((subcmd, args)) => (subcmd, Some(args.trim())),
+                        None => (v, None),
+                    }) {
+                        Some(("session", _)) => {
+                            let spinner = create_spinner("Compressing").await;
+                            let ret = Config::compress_session(&self.config).await;
+                            spinner.stop();
+                            ret?;
+                            println!("✨ Successfully compressed the session");
+                        }
+                        _ => {
+                            println!(r#"Usage: .compress session"#)
+                        }
+                    }
+                }
                 ".rebuild" => {
                     match args.map(|v| match v.split_once(' ') {
                         Some((subcmd, args)) => (subcmd, Some(args.trim())),
@@ -657,7 +679,7 @@ async fn ask(
                 color.italic().paint("Compressing the session."),
             );
             tokio::spawn(async move {
-                let _ = compress_session(&config).await;
+                let _ = Config::compress_session(&config).await;
                 config.write().end_compressing_session();
             });
         }
@@ -696,14 +718,6 @@ fn parse_command(line: &str) -> Option<(&str, Option<&str>)> {
     }
 }
 
-async fn compress_session(config: &GlobalConfig) -> Result<()> {
-    let input = Input::from_str(config, config.read().summarize_prompt(), None);
-    let client = input.create_client()?;
-    let summary = client.chat_completions(input).await?.text;
-    config.write().compress_session(&summary);
-    Ok(())
-}
-
 fn split_files_text(args: &str) -> (&str, &str) {
     match SPLIT_FILES_TEXT_ARGS_RE.find(args).ok().flatten() {
         Some(mat) => {