[jrubyscripting] JRuby scripting initial contribution

CODEOWNERS

@@ -6,6 +6,7 @@
 
 # Add-on maintainers:
 /bundles/org.openhab.automation.groovyscripting/ @wborn
+/bundles/org.openhab.automation.jrubyscripting/ @boc-tothefuture
 /bundles/org.openhab.automation.jsscripting/ @jpg0
 /bundles/org.openhab.automation.jythonscripting/ @openhab/add-ons-maintainers
 /bundles/org.openhab.automation.pidcontroller/ @fwolter

bom/openhab-addons/pom.xml

@@ -21,6 +21,11 @@
       <artifactId>org.openhab.automation.groovyscripting</artifactId>
       <version>${project.version}</version>
     </dependency>
+    <dependency>
+      <groupId>org.openhab.addons.bundles</groupId>
+      <artifactId>org.openhab.automation.jrubyscripting</artifactId>
+      <version>${project.version}</version>
+    </dependency>
     <dependency>
       <groupId>org.openhab.addons.bundles</groupId>
       <artifactId>org.openhab.automation.jsscripting</artifactId>

bundles/org.openhab.automation.jrubyscripting/NOTICE

@@ -0,0 +1,13 @@
+This content is produced and maintained by the openHAB project.
+
+* Project home: https://www.openhab.org
+
+== Declared Project Licenses
+
+This program and the accompanying materials are made available under the terms
+of the Eclipse Public License 2.0 which is available at
+https://www.eclipse.org/legal/epl-2.0/.
+
+== Source Code
+
+https://github.com/openhab/openhab-addons

bundles/org.openhab.automation.jrubyscripting/README.md

@@ -0,0 +1,72 @@
+# JRuby Scripting
+
+This add-on provides [JRuby](https://www.jruby.org/) 9.3.1 that can be used as a scripting language within automation rules.
+
+## JRuby Scripting Configuration
+
+After installing this add-on, you will find configuration options in the openHAB portal under _Settings -> Other Services -> JRuby Scripting_.
+
+Alternatively, JRuby configuration parameters may be set by creating a `jruby.cfg` file in `conf/services/`
+
+| Parameter                                             | Default                                 | Description                                                                                                                                                                                                 |
+| ----------------------------------------------------- | --------------------------------------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
+| org.openhab.automation.jrubyscripting:gem_home        | $OPENHAB_CONF/scripts/lib/ruby/gem_home | Location ruby gems will be installed and loaded, directory will be created if missing and gem installs are specified                                                                                        |
+| org.openhab.automation.jrubyscripting:rubylib         | $OPENHAB_CONF/automation/lib/ruby/      | Search path for user libraries. Separate each path with a colon (semicolon in Windows).                                                                                                                     |
+| org.openhab.automation.jrubyscripting:local_context   | singlethread                            | The local context holds Ruby runtime, name-value pairs for sharing variables between Java and Ruby. See [this](https://github.com/jruby/jruby/wiki/RedBridge#Context_Instance_Type) for options and details |
+| org.openhab.automation.jrubyscripting:local_variables | transient                               | Defines how variables are shared between Ruby and Java. See [this](https://github.com/jruby/jruby/wiki/RedBridge#local-variable-behavior-options) for options and details                                   |
+| org.openhab.automation.jrubyscripting:gems            |                                         | Comma separated list of [Ruby Gems](https://rubygems.org/) to install.                                                                                                                                      |
+
+## Ruby Gems
+
+This automation add-on will install user specified gems and make them available on the library search path.
+Gem versions may be specified using the standard ruby gem_name=version format.
+The version number follows the [pessimistic version constraint](https://guides.rubygems.org/patterns/#pessimistic-version-constraint) syntax.
+
+For example this configuration will install version 4 or higher of the [openHAB JRuby Scripting Library](https://boc-tothefuture.github.io/openhab-jruby/).
+
+```text
+org.openhab.automation.jrubyscripting:gems=openhab-scripting=~>4.0
+```
+
+## Creating JRuby Scripts
+
+When this add-on is installed, you can select JRuby as a scripting language when creating a script action within the rule editor of the UI.
+
+Alternatively, you can create scripts in the `automation/jsr223/ruby/personal` configuration directory.
+If you create an empty file called `test.rb`, you will see a log line with information similar to:
+
+```text
+    ... [INFO ] [.a.m.s.r.i.l.ScriptFileWatcher:150  ] - Loading script 'test.rb'
+```
+
+To enable debug logging, use the [console logging]({{base}}/administration/logging.html) commands to
+enable debug logging for the automation functionality:
+
+```text
+log:set DEBUG org.openhab.core.automation
+log:set DEBUG org.openhab.automation.jrubyscripting
+```
+
+## Imports
+
+All [ScriptExtensions]({{base}}/configuration/jsr223.html#scriptextension-objects-all-jsr223-languages) are available in JRuby with the following exceptions/modifications:
+
+- The File variable, referencing java.io.File is not available as it conflicts with Ruby's File class preventing Ruby from initializing
+- Globals scriptExtension, automationManager, ruleRegistry, items, voice, rules, things, events, itemRegistry, ir, actions, se, audio, lifecycleTracker are prepended with a $ (e.g. $automationManager) making them available as a global objects in Ruby.
+
+## Script Examples
+
+JRuby scripts provide access to almost all the functionality in an openHAB runtime environment.
+As a simple example, the following script logs "Hello, World!".
+Note that `puts` will usually not work since the output has no terminal to display the text.
+The openHAB server uses the [SLF4J](https://www.slf4j.org/) library for logging.
+
+```ruby
+require 'java'
+java_import org.slf4j.LoggerFactory
+
+LoggerFactory.getLogger("org.openhab.core.automation.examples").info("Hello world!")
+```
+
+JRuby can [import Java classes](https://github.com/jruby/jruby/wiki/CallingJavaFromJRuby).
+Depending on the openHAB logging configuration, you may need to prefix logger names with `org.openhab.core.automation` for them to show up in the log file (or you modify the logging configuration).

bundles/org.openhab.automation.jrubyscripting/pom.xml

@@ -0,0 +1,31 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://maven.apache.org/POM/4.0.0"
+  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+
+  <modelVersion>4.0.0</modelVersion>
+
+  <parent>
+    <groupId>org.openhab.addons.bundles</groupId>
+    <artifactId>org.openhab.addons.reactor.bundles</artifactId>
+    <version>3.2.0-SNAPSHOT</version>
+  </parent>
+
+  <artifactId>org.openhab.automation.jrubyscripting</artifactId>
+
+  <name>openHAB Add-ons :: Automation :: JRuby Scripting</name>
+
+  <properties>
+    <bnd.importpackage>com.sun.nio.*;resolution:=optional,com.sun.security.*;resolution:=optional,org.apache.tools.ant.*;resolution:=optional,org.bouncycastle.*;resolution:=optional,org.joda.*;resolution:=optional,sun.management.*;resolution:=optional,sun.nio.*;resolution:=optional</bnd.importpackage>
+    <jruby.version>9.3.1.0</jruby.version>
+  </properties>
+
+  <dependencies>
+    <dependency>
+      <groupId>org.jruby</groupId>
+      <artifactId>jruby-complete</artifactId>
+      <version>${jruby.version}</version>
+      <scope>compile</scope>
+    </dependency>
+  </dependencies>
+
+</project>

bundles/org.openhab.automation.jrubyscripting/src/main/feature/feature.xml

@@ -0,0 +1,9 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<features name="org.openhab.automation.jrubyscripting-${project.version}" xmlns="http://karaf.apache.org/xmlns/features/v1.4.0">
+	<repository>mvn:org.openhab.core.features.karaf/org.openhab.core.features.karaf.openhab-core/${ohc.version}/xml/features</repository>
+
+	<feature name="openhab-automation-jrubyscripting" description="JRuby Scripting" version="${project.version}">
+		<feature>openhab-runtime-base</feature>
+		<bundle start-level="80">mvn:org.openhab.addons.bundles/org.openhab.automation.jrubyscripting/${project.version}</bundle>
+	</feature>
+</features>