Add support for opening clipboard manager on Linux

- Added support for opening clipboard manager on Linux using common clipboard managers (copyq, gpaste-client, clipman, parcellite, xfce4-clipman, klipper, diodon) or using Win+V
- Moved open clipboard logic to a dedicated open_clipboard.py file
- Updated commands.py to use the new open_clipboard function

app/buttons/commands.py

@@ -212,7 +212,7 @@ def handle_command(message=None):
         pyautogui.hotkey("ctrl", "x")
 
     elif message.startswith("/clipboard"):
-        pyautogui.hotkey("win", "v")
+        system.open_clipboard()
 
     else:
         if message.startswith(("/volume", "/soundcontrol mute")):

app/buttons/system/__init__.py

@@ -4,4 +4,5 @@
 from .taskkill import kill
 from .restart_app import restart_app
 from .clear_clipboard import clear_clipboard
+from .open_clipboard import open_clipboard
 from .write import handle_command as write

app/buttons/system/open_clipboard.py

@@ -0,0 +1,48 @@
+from app.utils.platform import is_windows, is_linux
+
+import subprocess
+import pyautogui
+from app.utils.logger import log
+
+
+def open_clipboard():
+    if is_windows:
+        pyautogui.hotkey("win", "v")
+
+    if is_linux:
+        def is_command_available(command):
+            """Check if a command is available on the system."""
+            try:
+                if subprocess.run(["which", command], stdout=subprocess.DEVNULL, stderr=subprocess.DEVNULL).returncode == 0:
+                    return True
+                return False
+            except FileNotFoundError:
+                return False
+
+        # Check for common clipboard managers and open them if installed
+        clipboard_managers = {
+            "copyq": "copyq show",
+            "gpaste-client": "gpaste-client ui",
+            "clipman": "clipman show-history",
+            "parcellite": "parcellite",
+            "xfce4-clipman": "xfce4-clipman-history",
+            "klipper": "qdbus org.kde.klipper /klipper org.kde.klipper.klipper.showHistory",
+            "diodon": "diodon --indicator",
+        }
+
+        for manager, command in clipboard_managers.items():
+            if is_command_available(manager):
+                if subprocess.run(command, shell=True).returncode == 0:
+                    log.success(f"Opened clipboard manager: '{manager}' Using command: '{command}'")
+                else:
+                    log.error(f"Failed to open {manager}")
+
+                return
+
+        pyautogui.hotkey("win", "v")
+
+        log.error("No supported clipboard manager found. Please install one, e.g., 'copyq'. Performing default action (Win+V).")
+        raise RuntimeError("No supported clipboard manager found. Please install one, e.g., 'copyq'.  Performing default action (Win+V).")
+
+    else:
+        raise NotImplementedError("This is not implemented for this platform.")