Perform variable expansion in precondition `msg` output.

[gr1mpatr0n]

Description

Sometimes I would like to provide more meaningful output in preconditions.msg. For example, if I have a precondition that a task must be running in a MinGW-w64 environment, I may wish to print out what the MSYSTEM variable is:

msg: "Error: When running on Windows, this task requires a MinGW-w64 environment. Current MSYSTEM: $MSYSTEM"

Currently, the variable is not expanded.

[vmaerten]

Hello !

You can use the templating system :

version: '3'

tasks:
  default:
    preconditions:
      - sh: exit 1
        msg: "When running on Windows, this task requires a MinGW-w64 environment. Current MSYSTEM: {{.MSYSTEM}}"

Running this :
MSYSTEM=linux task
will output :

task: When running on Windows, this task requires a MinGW-w64 environment. Current MSYSTEM: linux
task: precondition not met

[gr1mpatr0n]

D'oh! Thanks.