feat: enhance workspace management and history tracking in application state

src/app/state/misc.rs

@@ -72,6 +72,7 @@ pub struct InputState {
     pub autocomplete_candidates: Vec<String>,
     pub autocomplete_idx: usize,
     pub autocomplete_visible: bool,
+    pub history_file: Option<PathBuf>,
 }
 
 const COMMANDS: &[&str] = &[
@@ -110,6 +111,7 @@ impl InputState {
             autocomplete_candidates: Vec::new(),
             autocomplete_idx: 0,
             autocomplete_visible: false,
+            history_file: None,
         }
     }
 
@@ -219,14 +221,22 @@ impl InputState {
         }
     }
 
-    /// Submit the current buffer: push it to history, clear the buffer,
-    /// and return the submitted text.
-    ///
-    /// Return: the text that was in the buffer before clearing.
     pub fn submit(&mut self) -> String {
         let result = self.buffer.clone();
         if !result.is_empty() {
-            self.history.push(result.clone());
+            if self.history.last() != Some(&result) {
+                self.history.push(result.clone());
+                if let Some(ref path) = self.history_file {
+                    if let Ok(mut file) = std::fs::OpenOptions::new()
+                        .create(true)
+                        .append(true)
+                        .open(path)
+                    {
+                        use std::io::Write;
+                        let _ = writeln!(file, "{}", result);
+                    }
+                }
+            }
             self.history_idx = None;
         }
         self.buffer.clear();