Add an option to show predefined tasks across environments easily

[hoxbro]

Problem description

I want to show a predefined list of tasks across environments when running pixi task list (or a new command). This will make it easy for me to explain what tasks are available for new users.

Currently, pixi task list only shows the task available in the default environments (in my case it is install and download-data). A way to show all tasks is pixi run non-existing-task, which shows all tasks.

❯ pixi run non-existing-task
non-existing-task: command not found

Available tasks:
        build-conda
        build-pip
        build-pyodide
        docs-build
        docs-server
        download-data
        install
        lint
        lint-install
        test-example
        test-ui
        test-unit
        x-docs-convert-gallery
        x-docs-copy-panel-dist
        x-docs-generate
        x-docs-pyodide
        x-docs-refmanual
        x-install-ui

At the same time, there are some tasks I don't want to show. These are prefixed with x- to put at the bottom of the list.

[ruben-arts]

I want this to!

[hoxbro]

I want to give it a go. Some questions I have are

1. How should I expose it? A field in pixi.toml. If so, what should it be called? project.available-tasks could be an option.
2. Should I use the current command pixi task list and show the available tasks if that setting is enabled (and an environment has not been passed)? Or should I use a new command?

[ruben-arts]

I would reuse the current pixi task list command. Note pixi task list --summary is used for auto-completion.

I don't think its weird that it would list all tasks in the project by default. The --environment already works so we should leave that in.

[abkfenris]

I also ran into this yesterday.

I know it would be different than how --environment works for other commands, but what about making pixi task list show all by default, and --environment filters to just that specific environment?

[hoxbro]

The --environment already works so we should leave that in.

That was what I meant, sorry if I was not clear.

What about an option to hide certain tasks?

Maybe: generate-schema = { cmd = "python model.py > schema.json", cwd = "schema" , hide_task=true}

[ruben-arts]

Ah I only focused on the cli.

Hiding the task would be a different story. Would you want to exclude it from the runnable tasks? Then we could do the same as Taskfile and name it internal = true then it will not be listed in the task list and also not be excepted as a runnable task. Otherwise hidden = true would make sense to me, if you would only want to hide it from the list.

[ruben-arts]

But these could definitely be two PR's, that would make it easier to review