Be able to pass arguments to task dependencies

[jansepke]

We are currently trying to integrate mise task in a monorepo where we want to run and build the different applications that all have a frontend and a backend. we want to utilize task dependencies for this but don't find a way to pass arguments to the task dependencies.

[tasks.start-backend]
dir = "apps"
run = 'cd {{arg(name="app")}}/backend && pnpm run dev'

[tasks.start-frontend]
dir = "apps"
run = 'cd {{arg(name="app")}}/frontend && pnpm run dev'

[tasks.start]
dir = "apps"
run = ""
depends = [
    'start-backend {{arg(name="app")}}',
    'start-frontend {{arg(name="app")}}',
]

Executing it with mise run start my-app.

The "app" should be configurable by the start so that the start task could have an arg() that could be passed to its dependencies. This would be similar to how Taskfile supports passing variables to dependencies https://taskfile.dev/usage/#calling-another-task

[jdx]

I would just use an env var

[jansepke]

yes that is possible, but not so convenient and does not support autocomplete for the argument
ENV=my-app mise run start vs. mise run start my-app

[jansepke]

I also tried running mise with multiple commands but this will behave differently compared to mise running in multiple dependency mode:

• task_output does not automatically switch to prefix
• Ctrl+C does not work at all

[qoomon]

@jdx could you guide me to the right entrypoint to implement variable resolution within depdendencies?

[jdx]

well the way args/flags work is placeholders like MISE_TASK_ARG:app:MISE_TASK_ARG get injected and are later replaced via regexes. I think that concept needs to be completely rethought for this to work correctly:

mise/src/task/task_script_parser.rs

Line 311 in cd8dc01

pub fn replace_template_placeholders_with_args(

notably though that logic has other problems like that you can't use arg values inside of templates.

Also this commit is likely useful for arguments were added to task definitions: 6861587#diff-63c4ec542e3c7285826dc853a62d78aaa9550e6bfc28225945e805701d794740

[qoomon]

It's probably an issue that i don't know rust :-D I expected to just resolve the variables directly after the depends tasks have been read. Thanks anyway. I'm looking forward when this feature gets implemented.

[qoomon]

@jdx can we just pass there args to the render tery.render_str function as additional context ?

mise/src/task/task_dep.rs

Lines 20 to 23 in f7c62d8

	self.task = tera.render_str(&self.task, tera_ctx)?;
	for a in &mut self.args {
	*a = tera.render_str(a, tera_ctx)?;
	}