Support ytt (or don't lose it when a file has ytt annotations)

[emmjohnson]

Please describe your feature request.
I wish I could use yq to evaluate a file with ytt annotations

Describe the solution you'd like
If we have input.yml like:
(please keep to around 10 lines )

#@ load("@ytt:data", "data")
#@ load("@ytt:template", "template")
#@ load("@env_vars:feature_flag.lib.yaml", "feature_flag_env_vars")
#@ load("@env_vars:database.lib.yaml", "database_env_vars")
#@ load("@env_vars:rabbitmq.lib.yaml", "rabbitmq_env_vars")

apiVersion: apps/v1
kind: Deployment
metadata:
  name: grylls
spec:
  template:
    spec:
      containers:
        - name: grylls
          image: #@ data.values.image_id
          ports:
            - containerPort: 80
          env:
            - name: GRYLLS_METRIC_PORT
              value: "8080"

            -  #@ template.replace(feature_flag_env_vars())

            - name: DRY_RUN
              value: "false"

            -  #@ template.replace(database_env_vars())
            -  #@ template.replace(rabbitmq_env_vars())

          resources:
            limits:
              memory: 3600Mi
            requests:
              cpu: "1.5"
              memory: 1700Mi

And in my go app, I run:

evaluator := yqlib.NewStringEvaluator()
operation := `select(.kind == "Deployment").spec.template.spec.containers.0.resources.limits.memory = "2Mi"`
fileContent, err = evaluator.Evaluate(operation, fileContent, encoder, decoder)

it could output

#@ load("@ytt:data", "data")
#@ load("@ytt:template", "template")
#@ load("@env_vars:feature_flag.lib.yaml", "feature_flag_env_vars")
#@ load("@env_vars:database.lib.yaml", "database_env_vars")
#@ load("@env_vars:rabbitmq.lib.yaml", "rabbitmq_env_vars")

apiVersion: apps/v1
kind: Deployment
metadata:
  name: grylls
spec:
  template:
    spec:
      containers:
        - name: grylls
          image: #@ data.values.image_id
          ports:
            - containerPort: 80
          env:
            - name: GRYLLS_METRIC_PORT
              value: "8080"

            -  #@ template.replace(feature_flag_env_vars())

            - name: DRY_RUN
              value: "false"

            -  #@ template.replace(database_env_vars())
            -  #@ template.replace(rabbitmq_env_vars())

          resources:
            limits:
              memory: 2Mi
            requests:
              cpu: "1.5"
              memory: 1700Mi

Currently, it moves ytt on to new lines -

#@ load("@ytt:data", "data")
#@ load("@ytt:template", "template")
#@ load("@env_vars:feature_flag.lib.yaml", "feature_flag_env_vars")
#@ load("@env_vars:database.lib.yaml", "database_env_vars")
#@ load("@env_vars:rabbitmq.lib.yaml", "rabbitmq_env_vars")

apiVersion: apps/v1
kind: Deployment
metadata:
  name: grylls
spec:
  template:
    spec:
      containers:
        - name: grylls
          image: #@ data.values.image_id
          ports:
            - containerPort: 80
          env:
            - name: GRYLLS_METRIC_PORT
              value: "8080"
            -
            #@ template.replace(feature_flag_env_vars())
            - name: DRY_RUN
              value: "false"
            -
            -
          #@ template.replace(rabbitmq_env_vars())

          #@ template.replace(database_env_vars())
          resources:
            limits:
              memory: 2Mi
            requests:
              cpu: "1.5"
              memory: 1700Mi

Describe alternatives you've considered
A clear and concise description of any alternative solutions or features you've considered.

Additional context
Add any other context or screenshots about the feature request here.

[emmjohnson]

Its possible this is a dupe of #1976