feat: Create action.yml

Author: LukeSavefrogs

action.yml

@@ -0,0 +1,94 @@
+name: 'Setup Jython'
+description: 'Installs Jython using the provided version'
+
+inputs:
+  jython-version:
+    description: 'The version of Jython to use'
+    required: true
+    default: '2.7.2'
+
+outputs:
+  jython-download-url:
+    description: "Random number"
+    value: ${{ steps.jython_installer_url.outputs.download_url }}
+
+runs:
+  using: "composite"
+  steps:
+    - name: Set up JDK 8
+      uses: actions/setup-java@v3
+      with:
+        java-version: '8'
+        distribution: 'temurin'
+
+    - name: Determine Jython installer URL
+      shell: bash
+      id: jython_installer_url
+      run: |
+        url_maven="https://repo1.maven.org/maven2/org/python/jython-installer/${{ inputs.jython-version }}/jython-installer-${{ inputs.jython-version }}.jar";
+        url_sourceforge="https://master.dl.sourceforge.net/project/jython/jython/${{ inputs.jython-version }}/jython_installer-${{ inputs.jython-version }}.jar?viasf=1";
+        
+        printf "Testing:\n"
+        printf -- "- Maven      : %s\n" "${url_maven}";
+        printf -- "- SourceForge: %s\n" "${url_sourceforge}";
+        
+        maven_headers="$(curl -sIL "${url_maven}")";
+
+        if echo "${maven_headers}" | grep -qE "HTTP/([0-9.]+) 200 (OK)?"; then
+            download_url="${url_maven}";
+        else
+            download_url="${url_sourceforge}";
+        fi
+
+        echo "Download URL: ${download_url}"
+        echo "::set-output name=download_url::${download_url}"
+
+    - name: Download Jython Installer
+      shell: bash
+      run: |
+        curl -sL "${{ steps.jython_installer_url.outputs.download_url }}" --output /tmp/jython_installer.jar;
+    
+    - name: Install Jython
+      shell: bash
+      run: |
+            # Installation types:
+            # - all       : everything (including src)
+            # - standard  : core, mod, demo, doc, ensurepip
+            #               standard is the default
+            # - minimum   : core
+            # - standalone: install a single, executable .jar,
+            #               containing all the modules
+            #
+            # Note - standalone installation may fail with the following stacktrace (tested on 2.7.2):1
+            # org.python.util.install.InstallerException: Error accessing jar file
+            #     at org.python.util.install.JarInstaller.inflate(JarInstaller.java:177)
+            #     at org.python.util.install.ConsoleInstaller.install(ConsoleInstaller.java:66)
+            #     at org.python.util.install.Installation.internalMain(Installation.java:389)
+            #     at org.python.util.install.Installation.main(Installation.java:43)
+            # Caused by: java.util.zip.ZipException: duplicate entry: module-info.class
+            #     at java.util.zip.ZipOutputStream.putNextEntry(ZipOutputStream.java:232)
+            #     at java.util.jar.JarOutputStream.putNextEntry(JarOutputStream.java:109)
+            #     at org.python.util.install.StandalonePackager.addJarFile(StandalonePackager.java:92)
+            #     at org.python.util.install.JarInstaller.inflate(JarInstaller.java:163)
+            #     ... 3 more
+
+            # This is why I use the standard installation
+            # java -jar /tmp/jython_installer.jar \
+            #     --silent \
+            #     --directory ~/jython/ \
+            #     --type standalone;
+
+            java -jar /tmp/jython_installer.jar \
+                --silent \
+                --directory ~/jython/ \
+                --type standard;
+            
+            echo "::set-output name=download_url::${download_url}"
+    
+    - name: Setup Jython alias
+      shell: bash
+      run: |
+        mkdir -p ~/.local/bin;
+        echo 'java -jar ~/jython/jython.jar "$@"' >> ~/.local/bin/jython;
+        chmod +x ~/.local/bin/jython;
+        echo ~/.local/bin >> $GITHUB_PATH