examples.md

Examples

1. Hello world

!js tags evalutes string as javascript

$ cat examples/hello-world.pkt

hello: !js name

$ pkt examples/hello-world.pkt --name world

hello: world

2. Any javascript can be used

$ cat examples/hello-world-2.pkt

syntax:
  block: !js |
    'this is string'
  inline: !js "'this is string'"
constants:
  array: !js |
    [1]
  number: !js |
    100
operators:
  add: !js 1 + 2
  concat: !js " name + ' !' "
control:
  conditional: !js " name == 'world' ? 'hello world' : 'who are you ?' "
  if: !js |
    if (name == 'world') { true } else { false }
  switch: !js |
    let result = 0;
    switch (name) {
      case 'world': result = 1; break;
      default: result = 2;
    }
    result;

$ pkt examples/hello-world-2.pkt --name universe

syntax:
  block: this is string
  inline: this is string
constants:
  array:
    - 1
  number: 100
operators:
  add: 3
  concat: universe !
control:
  conditional: who are you ?
  if: false
  switch: 2

3. Define local variables

$ cat examples/define-local-variables.pkt

/values: # var name = 'world'
  name: world
---
hello: !js name
---
/assign: # name = 'universe'
  name: universe
---
hello: !js name
---
/values: # array = [ 'john', 'jane' ]
  array:
    - john
    - jane
---
hello: !js array
---
/values: # object = { hello: 'world' }
  object:
    hello: world
---
object: !js object

$ pkt examples/define-local-variables.pkt

hello: world
---
hello: universe
---
hello:
  - john
  - jane
---
object:
  hello: world

4. If

$ cat examples/if.pkt

/if: !js type == 'nginx'
image: nginx-ingress-controller
---
/if: !js type == 'alb'
image: alb-ingress-controller

$ pkt examples/if.pkt --type nginx

image: nginx-ingress-controller

5. Include

$ cat examples/include.pkt

kind: Deployment
---
kind: Service
---
/if: !js ingress
/include: include-ingress.pkt

$ cat examples/include-ingress.pkt

kind: Ingress
spec:
  rules:
    host: !js ingress

$ pkt examples/include.pkt --ingress www

kind: Deployment
---
kind: Service
---
kind: Ingress
spec:
  rules:
    host: www

6. Text templating

$ cat examples/text-template.pkt

kind: ConfigMap
data:
  config.ini: !template |
    user = '<<<= user >>>'
---
kind: Secret
data:
  pass: !js $.base64encode(pass)

$ pkt examples/text-template.pkt --user admin --pass abcd

kind: ConfigMap
data:
  config.ini: |
    user = 'admin'
---
kind: Secret
data:
  pass: YWJjZA==