feat(snippets): implement snippet placeholder resolution

This commit introduces a new method to parse and resolve placeholders in snippet content, allowing for dynamic content insertion such as clipboard text, current date, and time. Additionally, it implements cursor positioning for better user experience during snippet expansion.

src-tauri/src/snippets/input_manager.rs

@@ -1,5 +1,5 @@
 use anyhow::Result;
-use enigo::{Enigo, Keyboard};
+use enigo::{Enigo, Key as EnigoKey, Keyboard};
 use lazy_static::lazy_static;
 use rdev::Key;
 use std::sync::{Arc, Mutex};
@@ -26,6 +26,7 @@ pub enum InputEvent {
 pub trait InputManager: Send + Sync {
     fn start_listening(&self, callback: Box<dyn Fn(InputEvent) + Send + Sync>) -> Result<()>;
     fn inject_text(&self, text: &str) -> Result<()>;
+    fn inject_key_clicks(&self, key: EnigoKey, count: usize) -> Result<()>;
 }
 
 pub struct RdevInputManager;
@@ -94,6 +95,14 @@ impl InputManager for RdevInputManager {
 
         Ok(())
     }
+
+    fn inject_key_clicks(&self, key: EnigoKey, count: usize) -> Result<()> {
+        let mut enigo = ENIGO.lock().unwrap();
+        for _ in 0..count {
+            enigo.key(key, enigo::Direction::Click)?;
+        }
+        Ok(())
+    }
 }
 
 // this implementation for wayland, because wayland is a pain and rdev no worky
@@ -112,6 +121,7 @@ impl EvdevInputManager {
             KeyCode::KEY_TAB,
             KeyCode::KEY_SPACE,
             KeyCode::KEY_BACKSPACE,
+            KeyCode::KEY_LEFT,
         ]);
 
         let text: &str =
@@ -298,6 +308,13 @@ impl EvdevInputManager {
         thread::sleep(Duration::from_millis(10));
         Ok(())
     }
+
+    fn enigo_to_evdev(key: EnigoKey) -> Option<KeyCode> {
+        match key {
+            EnigoKey::LeftArrow => Some(KeyCode::KEY_LEFT),
+            _ => None,
+        }
+    }
 }
 
 #[cfg(target_os = "linux")]
@@ -397,13 +414,21 @@ impl InputManager for EvdevInputManager {
             if ch == '\u{8}' {
                 self.inject_key_click(&mut *device, KeyCode::KEY_BACKSPACE)?;
             } else {
-            self.inject_char(&mut *device, ch)?;
-            self.inject_char(&mut *device, ch)?;
                 self.inject_char(&mut *device, ch)?;
             }
         }
         Ok(())
     }
+
+    fn inject_key_clicks(&self, key: EnigoKey, count: usize) -> Result<()> {
+        if let Some(keycode) = Self::enigo_to_evdev(key) {
+            let mut device = self.virtual_device.lock().unwrap();
+            for _ in 0..count {
+                self.inject_key_click(&mut *device, keycode)?;
+            }
+        }
+        Ok(())
+    }
 }
 
 pub fn key_to_char(key: &Key, is_shifted: bool) -> Option<char> {