Add default message when the list is empty

README.md

@@ -20,15 +20,15 @@ $ linetasker new "Finish writing unit tests" -p 5 --tags urgent --tags productio
 ```shell
 $ linetasker list
 ```
-![Alt text](assets/list.png)
+![List view](https://raw.githubusercontent.com/anthonyraf/linetasker/main/assets/list.png)
 ### II.2 - Filtering
 
 ```shell
 $ linetasker list -n 9 -t production
 ```
 > `-n`: number of the tasks to display from the top
 > `-t`: filter by tags
-![Alt text](assets/list_filtered.png)
+![Filtered list view](https://raw.githubusercontent.com/anthonyraf/linetasker/main/assets/list_filtered.png)
 
 ## III - Mark as done
 ```shell

linetasker/core.py

@@ -109,7 +109,17 @@ def list_tasks(self, n: int | None = None, _filter: Filter = None):
             for i in range(n):
                 task_list.add_rows(TaskTemplate(**self.db_dict["tasks"][i]))
 
-        console.print(task_list.render())
+        # Check if any tasks were added to the list
+        if count == 0 and _filter:
+            console.print(
+                "[yellow]No tasks found matching the specified criteria.[/yellow]"
+            )
+        elif n == 0:
+            console.print(
+                "[blue]No tasks found. Create a new task with 'linetasker new \"<task_description>\"'[/blue]"
+            )
+        else:
+            console.print(task_list.render())
 
     def get_done_tasks_ids(self) -> list[int]:
         """Return a list of the id of all done tasks"""

tests/.test.json

@@ -0,0 +1,14 @@
+{
+    "tasks": [
+        0,
+        1,
+        2,
+        3,
+        4,
+        5,
+        6,
+        7,
+        8,
+        9
+    ]
+}

tests/test_core.py

@@ -91,3 +91,27 @@ def filename(cls):
 
     def test_register_is_created(self, register: Register):
         assert isinstance(register, Register)
+
+    def test_list_tasks_empty_shows_message(self, register: Register, capsys):
+        """Test that listing tasks with no tasks shows a default message"""
+        register.list_tasks()
+        captured = capsys.readouterr()
+
+        # Should show a message instead of an empty table
+        assert "No tasks found" in captured.out
+        assert "Create a new task" in captured.out
+
+    def test_list_tasks_with_filter_no_matches_shows_message(self, register: Register, capsys):
+        """Test that listing tasks with filter that matches nothing shows a message"""
+        from linetasker.utils.filter import Filter
+
+        # Add a task first
+        register.create_task("Test task", 1, ["test"])
+
+        # Filter by a tag that doesn't exist
+        _filter = Filter(tags=["nonexistent"])
+        register.list_tasks(_filter=_filter)
+        captured = capsys.readouterr()
+
+        # Should show a message instead of an empty table
+        assert "No tasks found matching the specified criteria" in captured.out