Add JSON output for task list

commands/list.py

@@ -18,16 +18,22 @@ def validate_task_file():
     return tasks_file
 
 
-def list_tasks():
+def list_tasks(json_output=False):
     """List all tasks."""
-    # NOTE: No --json flag support yet (feature bounty)
     tasks_file = validate_task_file()
     if not tasks_file:
+        if json_output:
+            print("[]")
+            return
         print("No tasks yet!")
         return
 
     tasks = json.loads(tasks_file.read_text())
 
+    if json_output:
+        print(json.dumps(tasks, indent=2))
+        return
+
     if not tasks:
         print("No tasks yet!")
         return

task.py

@@ -28,6 +28,7 @@ def main():
 
     # List command
     list_parser = subparsers.add_parser("list", help="List all tasks")
+    list_parser.add_argument("--json", action="store_true", help="Output tasks as JSON")
 
     # Done command
     done_parser = subparsers.add_parser("done", help="Mark task as complete")
@@ -38,7 +39,7 @@ def main():
     if args.command == "add":
         add_task(args.description)
     elif args.command == "list":
-        list_tasks()
+        list_tasks(json_output=args.json)
     elif args.command == "done":
         mark_done(args.task_id)
     else:

test_task.py

@@ -5,6 +5,7 @@
 from pathlib import Path
 from commands.add import add_task, validate_description
 from commands.done import validate_task_id
+from commands.list import list_tasks
 
 
 def test_validate_description():
@@ -28,3 +29,16 @@ def test_validate_task_id():
 
     with pytest.raises(ValueError):
         validate_task_id(tasks, 99)
+
+
+def test_list_tasks_json_output(tmp_path, monkeypatch, capsys):
+    """Test JSON list output."""
+    tasks_file = tmp_path / ".local" / "share" / "task-cli" / "tasks.json"
+    tasks_file.parent.mkdir(parents=True)
+    tasks_file.write_text(json.dumps([{"id": 1, "description": "test", "done": False}]))
+    monkeypatch.setattr(Path, "home", lambda: tmp_path)
+
+    list_tasks(json_output=True)
+
+    output = capsys.readouterr().out
+    assert json.loads(output) == [{"id": 1, "description": "test", "done": False}]