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Henrik Lindberg hlindberg

  • Bebalon Ltd
  • Għarb, Gozo, Malta
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View puppet.ebnf
# Puppet EBNF (kind of)
# Try with:
ACTOR ::= 'actor' ( '(' PARAMS ')')? ('inherits' NAME)?
SEQUENCE ::= 'sequence' '{' (ACTION | SEQUENCE | PARALLEL)* '}'
PARALLEL ::= 'parallel' '{' (ACTION | SEQUENCE | PARALLEL)* '}'
View gist:e033ab9c8e20282cc494db6f04afc308
# The latch function remembers what it was called with
# and returns what it was previously called with.
# This is using global namespace - in your code use a module namespace
Puppet::Functions.create_function(:latch) do
dispatch :example do
repeated_param 'Any', :arg
hlindberg / sorthash.pp
Created Nov 25, 2019
This is an example of how to recursively sort a Hash in the puppet language using the tree_each() function
View sorthash.pp
# When you need to process a hash with keys in sorted order
# you may have found the `sort()` function - but it only
# operates on an Array.
# Most of the time what is wanted is simply achieved
# by taking the keys of a hash and sorting those and
# then iterating over the keys.
# When, however the wanted result is a new Hash
# with all keys sorted recursively then this becomes
View example.pp
$h = { 'b' => ['banana', 'bandana'], 'o' => ['orange', 'ovaltine'] }
$h2 = $ |$k, $v | { [$k,$v[0]] }
notice "h2 = ${h2}"
notice Hash($h2)
View puppet_grammar.xhtml
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" ""><html xmlns="">
<meta http-equiv="Content-Type" content="application/xhtml+xml; charset=UTF-8" />
<meta name="generator" content="Railroad Diagram Generator 1.52.1729" />
<style type="text/css">
color: #FFFEF8;
background: #1E1800;
hlindberg / any2bool.rb
Created Nov 2, 2018
Example: Puppet function calling new to create a Boolean from a String
View any2bool.rb
Puppet::Functions.create_function(:any2bool) do
dispatch :any2bool do
param 'Any', :to_be_converted
def any2bool(to_be_converted)
call_function('new', Puppet::Pops::Types::PBooleanType::DEFAULT, to_be_converted)
hlindberg / functional_puppet.pp
Created Oct 5, 2018
A fun example using Deferred to write puppet code in a functional style
View functional_puppet.pp
# Resolves a given value - if given a Deferred it will be called and all other values are returned as is.
function resolve(Any $x) {
if $x =~ Deferred { $ } else { $x }
# Resolves and evaluates a condition and either resolves and evaluates the given when_true,
# or the given when_false depending on the outcome of the evaluation of the condition.
# The result is undef if the selected when_true/when_false is undefined.
hlindberg / sample_mocking_spec.rb
Last active May 8, 2020
An rspec sample showing some override and mocking of 4.x functions/function loading
View sample_mocking_spec.rb
require 'spec_helper'
# Example rspec_puppet function rspec test (i.e. subject is the function 'min')
# This works for other rspec subjects as well as a compiler is always involved.
# This kind of mocking can be required when it is not enough to simply override
# a function with another implementation (which can be done with a `let(:pre_condition) { 'function min($x, $y) { ... }'}`
# The main difficulty that this overcomes is the need to let the compiler initialize and
# create the context in which it will operate before making any mocks.
StringJoiner joiner = new StringJoiner(",");
for (Item item : list) {
return joiner.toString();
hlindberg /
Last active Sep 2, 2018
Stringified output
expression type example output
literal undef nil
literal default "default"
literal integer 1
literal float 3.14
literal false false
literal true true
literal string "hello"
literal regexp "/this|that.*/"