Task Manager kata

Goal: practice TDD and clean architecture by implementing a task manager

Specification

Each task is made of

• A description
• A number that identifies it
• A status "done" or "to do"

The task manager must start an interaction loop where the user can enter some commands, like this:

• + description> Add a task
• - <id> Remove the task matching the given id
• x <id> Set the status of the task matching the id to "done"
• o <id> Set the status of the task matching the id to "to do"
• q Exit the interaction loop

At each step, the task manager must show the list of tasks:

Here's an example of using the task manager:

No task yet
>>> + Learn Python
1 [ ] Learn Python
>>> + Learn TDD
1 [ ] Learn Python
2 [ ] Learn TDD
>>> x 1
1 [x] Learn Python
2 [ ] Learn TDD
>>> q
Bye!

Instructions

• Follow the TDD rules as close as possible to implement the above specifications.

• Use an iterative process - going through the following steps, in order:

1. Parse user input (+, -, x, o, q)

Note: by parser, we mean a function that takes a strring and returns something that is not a string. For instance, a command, a list of tokens, ...

2. Update the task list
3. Display the tasks
4. Run the interaction loop

Notes

• You can assume the user only enters valid inputs.
• The task list does not need to be persistent - it's OK if the task manager always starts empty
• Make a commit and push it at the end of each TDD cycle.

Going further

• Implement undo - there is a famous design pattern that can help
• Implement storing tasks in a db (for instance using sqlite, or a big json file)
• Implement with some constraints, for instance
  • No mutation
  • No classes
  • No plain objects