Global vars can't use .CLI_ARGS special var as default value

[angelmadames]

Description

I wanted to use a global vars: key to default to the .CLI_ARGS special var.

vars:
  ENV: '{{.ENV | default .CLI_ARGS}}'

And then use it in a task, so both of these examples work:

task debug -- dev  # Should use 'dev' as value for `ENV`
task debug ENV=dev # Should behave similarly as `-- dev`

The above behavior works if vars: is used directly in the task definition:

tasks:
  debug:
    vars:
      ENV: '{{.ENV | default .CLI_ARGS}}'
    cmds:
      - echo '{{.ENV}}'

Only when using vars: globally .CLI_ARGS comes empty and doesn't work.

Version

v3.41.0 (h1:giUddhe0XZLbEWIQ/MuTPipR9ek+teulIA5xf/2IHXg=)

Operating system

macOS Sequioa 15.3.1 (24D70)

Experiments Enabled

No response

Example Taskfile

version: '3'

vars:
  ENV: '{{.ENV | default .CLI_ARGS}}'

tasks:
  debug:
    cmds:
      - echo '{{.ENV}}'

[trulede]

Some of the special vars are set here:

task/compiler.go

Line 199 in b9d202c

func (c *Compiler) getSpecialVars(t *ast.Task, call *Call) (map[string]string, error) {

and the CLI args are set here, I think after the task has been compiled, which means they are not available to any previous global vars which have already been resolved (i.e. this issue):

task/cmd/task/task.go

Line 220 in b9d202c

globals.Set("CLI_ARGS", ast.Var{Value: cliArgs})

EDIT:
Could be that the CLI special vars are added to the task.go global vars, after those in the Taskfile and IIRC Vars are evaluated in order which would mean that the global var which references a CLI special var would not evaluate (since that reference would not have been resolved).

[trulede]

This call loads the global vars:

task/cmd/task/task.go

Line 169 in b9d202c

err := e.Setup()

Then this one adds the CLI special vars:

task/cmd/task/task.go

Line 225 in b9d202c

e.Taskfile.Vars.Merge(globals, nil)

since they are after the global vars, they will not be resolved by the templating (since that is ordered).

Conversely, the other special vars are loaded by the compiler here:

task/compiler.go

Line 49 in b9d202c

specialVars, err := c.getSpecialVars(t, call)

these go in after the env vars, but before the global vars ... so those work.

Solution would be to either; relocate the CLI special vars to getSpecialVars() (which might be tricky), or to change the order that the CLI special vars are merged into e.Taskfile.Vars.Merge(globals, nil). I think the former is the better solution, if it could be achieved.