Add --json output support for add/list/done

README.md

@@ -18,11 +18,38 @@ python task.py --help
 # Add a task
 python task.py add "Buy groceries"
 
+# Add a task with JSON output
+python task.py add "Buy groceries" --json
+
 # List tasks
 python task.py list
 
+# List tasks with JSON output
+python task.py list --json
+
 # Complete a task
 python task.py done 1
+
+# Complete a task with JSON output
+python task.py done 1 --json
+```
+
+### JSON Output Examples
+
+```bash
+python task.py add "Buy groceries" --json
+```
+
+```json
+{"success": true, "message": "Added task 1: Buy groceries", "task": {"id": 1, "description": "Buy groceries", "done": false}}
+```
+
+```bash
+python task.py list --json
+```
+
+```json
+{"success": true, "tasks": [{"id": 1, "description": "Buy groceries", "done": false}]}
 ```
 
 ## Testing

commands/add.py

@@ -19,7 +19,7 @@ def validate_description(description):
     return description.strip()
 
 
-def add_task(description):
+def add_task(description, json_output=False):
     """Add a new task."""
     description = validate_description(description)
 
@@ -31,7 +31,16 @@ def add_task(description):
         tasks = json.loads(tasks_file.read_text())
 
     task_id = len(tasks) + 1
-    tasks.append({"id": task_id, "description": description, "done": False})
+    task = {"id": task_id, "description": description, "done": False}
+    tasks.append(task)
 
     tasks_file.write_text(json.dumps(tasks, indent=2))
+    if json_output:
+        print(json.dumps({
+            "success": True,
+            "message": f"Added task {task_id}: {description}",
+            "task": task,
+        }))
+        return
+
     print(f"Added task {task_id}: {description}")

commands/done.py

@@ -17,10 +17,13 @@ def validate_task_id(tasks, task_id):
     return task_id
 
 
-def mark_done(task_id):
+def mark_done(task_id, json_output=False):
     """Mark a task as complete."""
     tasks_file = get_tasks_file()
     if not tasks_file.exists():
+        if json_output:
+            print(json.dumps({"success": False, "error": "No tasks found!"}))
+            return
         print("No tasks found!")
         return
 
@@ -31,7 +34,17 @@ def mark_done(task_id):
         if task["id"] == task_id:
             task["done"] = True
             tasks_file.write_text(json.dumps(tasks, indent=2))
+            if json_output:
+                print(json.dumps({
+                    "success": True,
+                    "message": f"Marked task {task_id} as done: {task['description']}",
+                    "task": task,
+                }))
+                return
             print(f"Marked task {task_id} as done: {task['description']}")
             return
 
+    if json_output:
+        print(json.dumps({"success": False, "error": f"Task {task_id} not found"}))
+        return
     print(f"Task {task_id} not found")

commands/list.py

@@ -18,20 +18,29 @@ 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(json.dumps({"success": True, "tasks": []}))
+            return
         print("No tasks yet!")
         return
 
     tasks = json.loads(tasks_file.read_text())
 
     if not tasks:
+        if json_output:
+            print(json.dumps({"success": True, "tasks": []}))
+            return
         print("No tasks yet!")
         return
 
+    if json_output:
+        print(json.dumps({"success": True, "tasks": tasks}))
+        return
+
     for task in tasks:
         status = "✓" if task["done"] else " "
         print(f"[{status}] {task['id']}. {task['description']}")

task.py

@@ -25,22 +25,28 @@ def main():
     # Add command
     add_parser = subparsers.add_parser("add", help="Add a new task")
     add_parser.add_argument("description", help="Task description")
+    add_parser.add_argument("--json", action="store_true", dest="json_output",
+                            help="Output JSON")
 
     # List command
     list_parser = subparsers.add_parser("list", help="List all tasks")
+    list_parser.add_argument("--json", action="store_true", dest="json_output",
+                             help="Output JSON")
 
     # Done command
     done_parser = subparsers.add_parser("done", help="Mark task as complete")
     done_parser.add_argument("task_id", type=int, help="Task ID to mark done")
+    done_parser.add_argument("--json", action="store_true", dest="json_output",
+                             help="Output JSON")
 
     args = parser.parse_args()
 
     if args.command == "add":
-        add_task(args.description)
+        add_task(args.description, json_output=args.json_output)
     elif args.command == "list":
-        list_tasks()
+        list_tasks(json_output=args.json_output)
     elif args.command == "done":
-        mark_done(args.task_id)
+        mark_done(args.task_id, json_output=args.json_output)
     else:
         parser.print_help()
 

test_task.py

@@ -1,9 +1,13 @@
 """Basic tests for task CLI."""
 
 import json
-import pytest
+import subprocess
+import sys
 from pathlib import Path
-from commands.add import add_task, validate_description
+
+import pytest
+
+from commands.add import validate_description
 from commands.done import validate_task_id
 
 
@@ -28,3 +32,50 @@ def test_validate_task_id():
 
     with pytest.raises(ValueError):
         validate_task_id(tasks, 99)
+
+
+def run_cli(tmp_path, *args):
+    """Run the CLI with an isolated HOME directory."""
+    env = {"HOME": str(tmp_path)}
+    result = subprocess.run(
+        [sys.executable, "task.py", *args],
+        cwd=Path(__file__).parent,
+        env=env,
+        capture_output=True,
+        text=True,
+        check=True,
+    )
+    return json.loads(result.stdout)
+
+
+def test_add_command_supports_json_output(tmp_path):
+    """Add command emits valid JSON output."""
+    payload = run_cli(tmp_path, "add", "Buy groceries", "--json")
+    assert payload["success"] is True
+    assert payload["task"] == {
+        "id": 1,
+        "description": "Buy groceries",
+        "done": False,
+    }
+
+
+def test_list_command_supports_json_output(tmp_path):
+    """List command emits valid JSON output."""
+    run_cli(tmp_path, "add", "Buy groceries", "--json")
+    payload = run_cli(tmp_path, "list", "--json")
+    assert payload["success"] is True
+    assert payload["tasks"] == [
+        {"id": 1, "description": "Buy groceries", "done": False}
+    ]
+
+
+def test_done_command_supports_json_output(tmp_path):
+    """Done command emits valid JSON output."""
+    run_cli(tmp_path, "add", "Buy groceries", "--json")
+    payload = run_cli(tmp_path, "done", "1", "--json")
+    assert payload["success"] is True
+    assert payload["task"] == {
+        "id": 1,
+        "description": "Buy groceries",
+        "done": True,
+    }