This script uses the official Todoist API to indicate the number of tasks of each priority level.

By default, only tasks with a set 'due date' which is equal to the current date are taken into account. (But you can easily change that; for example, I personally use the filter today | overdue | no date.)

The same module is available for waybar here.

0. Download polybar-todoist.py from this repo.
1. Install the official Todoist Python Module. (e.g. with pip install todoist-api-python)
2. Configure the API Token retrieval.
3. Copy-paste the following example configuration into your polybar config:

   [module/todoist]
   
   type = custom/script
   
   exec = python -u /path/to/polybar-todoist.py
   tail = true
   
   click-left = xdg-open https://todoist.com

To get your Todoist tasks, the python module uses the Todoist API. This requires an API Token. You can get one in the Todoist Integrations Settings. (Todoist -> Settings -> Integrations)

Now the tricky part is how the polybar-todoist.py script gets access to your API token. For this, the script implements a api_token() function. You are required to implement this method, such that it returns your API token.

The simplest way would be to hard-code it into the script (i.e. return <YOUR_API_TOKEN>), but I don't recommend this. Rather, query it from your password manager / keyring, or read it from an external file.

By default, it asks GNOME Keyring for a password with the uuid todoist_api_token. So if you use GNOME Keyring anyway, you can just execute

secret-tool store --label='Todoist API Token' uuid todoist_api_token

and type in your API Token. Then it works out of the box.

The code is very short and simple. You can easily customize output style, task filter, and so on.