chained calls and return values

    tasks:
    - name: facts
      desc: gather facts
      task:
      - func: shell
        do:
        - uname
        reg: result
      - func: cmd
        desc: get os  - [Darwin | Linux]
        dvars:
        - name: os
          value: '{{ .result.Output }}'
          flags:
          - v
        do:
        - name: print
          cmd: 'facts OS: {{.os}}'
        - name: return
          cmd:
          - os
    - name: testingWarning
      desc: it should warn if the build task is for testing only
      task:
      - func: block
        do:
        - func: cmd
          do:
          - name: print
            cmd: 'in sub task - building OS: {{.os}}'
          - name: colorPrint
            cmd:
              msg: ?? WARN - This is a build for testing purpose only
              fg: red
        if: '{{ eq .os "Darwin" }}'
    - name: task
      desc: build the showcases automatically
      task:
      - func: call
        do:
        - facts
        - testingWarning
      - func: cmd
        do:
        - name: print
          cmd: 'in main task - building OS: {{.os}}'
    

    loading [Config]:  ./tests/functests/upconfig.yml
    Main config:
                 Version -> 1.0.0
                  RefDir -> ./tests/functests
                 WorkDir -> cwd
              AbsWorkDir -> /up_project/up
                TaskFile -> c0150
                 Verbose -> vvv
              ModuleName -> self
               ShellType -> /bin/sh
           MaxCallLayers -> 8
                 Timeout -> 3600000
     MaxModuelCallLayers -> 256
               EntryTask -> task
      ModRepoUsernameRef -> 
      ModRepoPasswordRef -> 
    work dir: /up_project/up
    -exec task: task
    loading [Task]:  ./tests/functests/c0150
    module: [self], instance id: [dev], exec profile: []
    profile -  envVars:
    
    (*core.Cache)({
    })
    
    Task3: [task ==> task: build the showcases automatically ]
    -Step1:
    self: final context exec vars:
    
    (*core.Cache)({
      "up_runtime_task_layer_number": 0
    })
    
    =Task1: [task ==> facts: gather facts ]
    --Step1:
    self: final context exec vars:
    
    (*core.Cache)({
      "up_runtime_task_layer_number": 1
    })
    
    cmd( 1):
    uname
    
    -
    Linux
    
    -
     .. ok
    . ok
    --Step2: [: get os  - [Darwin | Linux] ]
    dvar> os:
    "Linux"
    
    -
    Linux
    self: final context exec vars:
    
    (*core.Cache)({
      "last_result": (*utils.ExecResult)({
        Cmd: "uname",
        Code: 0,
        Output: "Linux",
        ErrMsg: ""
      }),
      "up_runtime_task_layer_number": 1,
      "result": (*utils.ExecResult)({
        Cmd: "uname",
        Code: 0,
        Output: "Linux",
        ErrMsg: ""
      }),
      "os": "Linux"
    })
    
    ~~SubStep1: [print:  ]
    facts OS: Linux
    ~~SubStep2: [return:  ]
    =Task2: [task ==> testingWarning: it should warn if the build task is for testing only ]
    --Step1:
    self: final context exec vars:
    
    (*core.Cache)({
      "last_result": (*utils.ExecResult)({
        Cmd: "uname",
        Code: 0,
        Output: "Linux",
        ErrMsg: ""
      }),
      "os": "Linux",
      "up_runtime_task_layer_number": 1,
      "result": (*utils.ExecResult)({
        Cmd: "uname",
        Code: 0,
        Output: "Linux",
        ErrMsg: ""
      })
    })
    
    condition failed, skip executing step 
    
    -Step2:
    self: final context exec vars:
    
    (*core.Cache)({
      "os": "Linux",
      "up_runtime_task_layer_number": 1
    })
    
    ~SubStep1: [print:  ]
    in main task - building OS: Linux