jsonnet

See:

• jsonnet Command Line
• tutorial
• language reference
• repo
• go implementation
• python binding
• there is also a bundler
• google group jsonnet

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,
}),

Missing loop

  local loop(ax,nx,qx,rx) =
    if int.lt(rx, b) then
      [qx,rx]
    else
      local qxrx = newQR(newN(ax,nx),qx,rx);
      loop(qxrx[1],1,qxrx[0],qxrx[1]);
  loop(a,1,0,a),

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,
  }),