Merge pull request #125 from projectsyn/value_default

Add getValueOrDefault helper

CHANGELOG.md

@@ -5,6 +5,11 @@ Please document all notable changes to this project in this file.
 The format is based on [Keep a Changelog](http://keepachangelog.com/)
 and this project adheres to [Semantic Versioning](http://semver.org/).
 
+## [Unreleased]
+### Added
+
+* `getValueOrDefault` helper ([#125])
+
 ## [v0.1.6]
 
 ### Changed
@@ -64,6 +69,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 
 Initial implementation
 
+[Unreleased]: https://github.com/projectsyn/commodore/compare/v0.1.6...HEAD
 [v0.1.0]: https://github.com/projectsyn/commodore/releases/tag/v0.1.0
 [v0.1.1]: https://github.com/projectsyn/commodore/releases/tag/v0.1.1
 [v0.1.2]: https://github.com/projectsyn/commodore/releases/tag/v0.1.2
@@ -82,3 +88,4 @@ Initial implementation
 [#100]: https://github.com/projectsyn/commodore/pull/100
 [#103]: https://github.com/projectsyn/commodore/pull/103
 [#106]: https://github.com/projectsyn/commodore/pull/106
+[#125]: https://github.com/projectsyn/commodore/pull/125

commodore/lib/commodore.libjsonnet

@@ -123,6 +123,16 @@ local envList(map) = [
   for x in std.objectFields(map)
 ];
 
+/*
+ * \brief Helper to get a fields value or a default.
+ *
+ * \arg dict An arbitrary dictionary data structure.
+ * \arg field The name of a field.
+ * \arg default The value to return if the field is not present on the dict.
+ */
+local getValueOrDefault(dict, field, default) =
+  if std.objectHas(dict, field) then dict[field] else default;
+
 {
   inventory: std.native('inventory'),
   yaml_load: std.native('yaml_load'),
@@ -133,4 +143,5 @@ local envList(map) = [
   addNamespaceToHelmOutput: addNamespaceToHelmOutput,
   proxyVars: proxyVars,
   envList: envList,
+  getValueOrDefault: getValueOrDefault,
 }