inspect.libsonnet

local d = import 'doc-util/main.libsonnet';

{
  local this = self,

  '#': d.pkg(
    name='inspect',
    url='github.com/jsonnet-libs/xtd/inspect.libsonnet',
    help='`inspect` implements helper functions for inspecting Jsonnet',
  ),

  '#inspect':: d.fn(
    |||
      `inspect` reports the structure of a Jsonnet object with a recursion depth of
      `maxDepth` (default maxDepth=10).
    |||,
    [
      d.arg('object', d.T.object),
      d.arg('maxDepth', d.T.number),
      //d.arg('depth', d.T.number), // used for recursion, not exposing in docs
    ]
  ),
  inspect(object, maxDepth=10, depth=0):
    std.foldl(
      function(acc, p)
        acc + (
          if std.isObject(object[p])
             && depth != maxDepth
          then { [p]+:
            this.inspect(
              object[p],
              maxDepth,
              depth + 1
            ) }
          else {
            [
            (if !std.objectHas(object, p)
             then 'hidden_'
             else '')
            + (if std.isFunction(object[p])
               then 'functions'
               else 'fields')
            ]+: [p],
          }
        ),
      std.objectFieldsAll(object),
      {}
    ),

  '#diff':: d.fn(
    |||
      `diff` returns a JSON object describing the differences between two inputs. It
      attemps to show diffs in nested objects and arrays too.

      Simple example:

      ```jsonnet
      local input1 = {
        same: 'same',
        change: 'this',
        remove: 'removed',
      };

      local input2 = {
        same: 'same',
        change: 'changed',
        add: 'added',
      };

      diff(input1, input2),
      ```

      Output:
      ```json
      {
        "add +": "added",
        "change ~": "~[ this , changed ]",
        "remove -": "removed"
      }
      ```
    |||,
    [
      d.arg('input1', d.T.any),
      d.arg('input2', d.T.any),
    ]
  ),
  diff(input1, input2)::
    if input1 == input2
    then ''
    else if std.isArray(input1) && std.isArray(input2)
    then
      [
        if input1[i] != input2[i]
        then
          this.diff(
            input1[i],
            input2[i]
          )
        else input2[i]
        for i in std.range(0, std.length(input2) - 1)
        if std.length(input1) > i
      ]
      + (if std.length(input1) < std.length(input2)
         then [
           '+ ' + input2[i]
           for i in std.range(std.length(input1), std.length(input2) - 1)
         ]
         else [])
      + (if std.length(input1) > std.length(input2)
         then [
           '- ' + input1[i]
           for i in std.range(std.length(input2), std.length(input1) - 1)
         ]
         else [])

    else if std.isObject(input1) && std.isObject(input2)
    then std.foldl(
           function(acc, k)
             acc + (
               if k in input1 && input1[k] != input2[k]
               then {
                 [k + ' ~']:
                   this.diff(
                     input1[k],
                     input2[k]
                   ),
               }
               else if !(k in input1)
               then {
                 [k + ' +']: input2[k],
               }
               else {}
             ),
           std.objectFields(input2),
           {},
         )
         + {
           [l + ' -']: input1[l]
           for l in std.objectFields(input1)
           if !(l in input2)
         }

    else '~[ %s ]' % std.join(' , ', [std.toString(input1), std.toString(input2)]),

  '#filterObjects':: d.fn(
    |||
      `filterObjects` walks a JSON tree returning all matching objects in an array.

      The `x` argument can either be an object or an array, other types will be
      ignored.
    |||,
    args=[
      d.arg('filter_func', d.T.func),
      d.arg('x', d.T.any),
    ]
  ),
  filterObjects(filter_func, x):
    if std.isObject(x)
    then
      if filter_func(x)
      then [x]
      else
        std.foldl(
          function(acc, o)
            acc + self.filterObjects(filter_func, x[o]),
          std.objectFields(x),
          []
        )
    else if std.isArray(x)
    then
      std.flattenArrays(
        std.map(
          function(obj)
            self.filterObjects(filter_func, obj),
          x
        )
      )
    else [],

  '#filterKubernetesObjects':: d.fn(
    |||
      `filterKubernetesObjects` implements `filterObjects` to return all Kubernetes objects in
      an array, assuming that Kubernetes object are characterized by having an
      `apiVersion` and `kind` field.

      The `object` argument can either be an object or an array, other types will be
      ignored. The `kind` allows to filter out a specific kind, if unset all kinds will
      be returned.
    |||,
    args=[
      d.arg('object', d.T.any),
      d.arg('kind', d.T.string, default=''),
    ]
  ),
  filterKubernetesObjects(object, kind=''):
    local objects = self.filterObjects(
      function(object)
        std.objectHas(object, 'apiVersion')
        && std.objectHas(object, 'kind'),
      object,
    );
    if kind == ''
    then objects
    else
      std.filter(
        function(o) o.kind == kind,
        objects
      ),
}