jsonnet

See:

• tutorial,
• language reference
• repo,
• go implementation,
• python binding,
• man page,
• there is also a bundler,

Install

On MacOS this did it:

brew install jsonnet

> jsonnet --version
Jsonnet commandline interpreter v0.20.0

Example Use

> jsonnet --tla-str prefix="Happy Hour " \
  --tla-code brunch=true \
  top-level-tla.jsonnet
{
   "Happy Hour Bloody Mary": {
      "garnish": "Celery salt & pepper",
      "ingredients": [
         {
            "kind": "Vodka",
            "qty": 1.5
         },
         {
            "kind": "Tomato Juice",
            "qty": 3
         },
         {
            "kind": "Lemon Juice",
            "qty": 1.5
         },
         {
            "kind": "Worcestershire",
            "qty": 0.25
         },
         {
            "kind": "Tobasco Sauce",
            "qty": 0.14999999999999999
         }
      ],
      "served": "Tall"
   },
   "Happy Hour Mimosa": {
      "garnish": "Orange Slice",
      "ingredients": [
         {
            "kind": "Cheap Sparkling Wine",
            "qty": 3
         },
         {
            "kind": "Orange Juice",
            "qty": 3
         }
      ],
      "served": "Champagne Flute"
   },
   "Happy Hour Pina Colada": {
      "garnish": "Pineapple slice",
      "ingredients": [
         {
            "kind": "Rum",
            "qty": 3
         },
         {
            "kind": "Pineapple Juice",
            "qty": 6
         },
         {
            "kind": "Coconut Cream",
            "qty": 2
         },
         {
            "kind": "Ice",
            "qty": 12
         }
      ],
      "served": "Frozen"
   }
}

More examples.

Missing switch

switch is missing but can be replaced with a function.

switch.libsonnet:

function(key, map) [
  map[key],
][0]

Then in your foo.jsonnet:

local switch = import 'switch.libsonnet';
local replicas = switch(cluster.account, {
   prod: 100,
   stage: 10,
   dev: 1,
}),

Debugging Output

This prints value of clusters and returns it:

std.trace('clusters: %s' % std.manifestJson(clusters),  clusters)

std.manifestJsonMinified

Produce a string of JSON:

std.manifestJsonMinified({
    account: dev_account_id,
    service: business_service,
    dir: kms_module_dir,
  }),