Support YAML anchors in task cmds object.

[trulede]

task/taskfile/ast/task.go

Line 109 in e47f557

var cmds []*Cmd

Support the decoding of YAML anchors in task cmds, similar to #2551.

Example taskfile:

version: '3'

silent: true

vars:
  FOO_VAR: tf_var_foo

env:
  FOO_ENVAR: tf_envar_foo 

tasks:
  default:
    cmds:
      - task: override
  print:
    internal: true
    cmds: &print_cmds
      - cmd: echo "{{.TASK}}"
      - cmd: echo "  var FOO_VAR = {{.FOO_VAR}}"
      - cmd: echo "  var FOO_ENVAR = {{.FOO_ENVAR}}"
      - cmd: echo "  env FOO_ENVAR = $FOO_ENVAR"
  override:
    vars:
      FOO_VAR: t_var_foo
    env:
      FOO_ENVAR: t_envar_foo
    cmds: 
      <<: *print_cmds

General idea is to support DRY principle for sequences of commands.

[andreynering]

I'm not a fan of YAML anchors, honestly. But open to opinions from @pd93 and @vmaerten if we should support them.

[trulede]

With the correct syntax it works. No change required.

version: '3'

silent: true

vars:
  FOO_VAR: tf_var_foo

env:
  FOO_ENVAR: tf_envar_foo 

tasks:
  default:
    cmds:
      - task: anchor  # Needs PR #2551.
  anchor-map:
    internal: true
    vars: &var_anchor
      FOO_VAR: map_var_foo
    env: &env_anchor
      FOO_ENVAR: map_envar_foo
    cmds: &cmd_anchor
      - cmd: echo "{{.TASK}}"
      - cmd: echo "  var FOO_VAR = {{.FOO_VAR}}" # t_var_foo
      - cmd: echo "  var FOO_ENVAR = {{.FOO_ENVAR}}" # tf_envar_foo
      - cmd: echo "  env FOO_ENVAR = $FOO_ENVAR" # t_envar_foo
  anchor: # Needs PR #2551, build/install PR and remove following xx to enable. 
    xxvars:
      <<: *var_anchor
    xxenv:
      <<: *env_anchor
    cmds: *cmd_anchor